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/*
 * Copyright 2014 - Present Rafael Winterhalter
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.bytebuddy;

import net.bytebuddy.build.AccessControllerPlugin;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.description.annotation.AnnotationValue;
import net.bytebuddy.description.field.FieldDescription;
import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.description.method.ParameterDescription;
import net.bytebuddy.description.modifier.*;
import net.bytebuddy.description.type.*;
import net.bytebuddy.dynamic.*;
import net.bytebuddy.dynamic.scaffold.*;
import net.bytebuddy.dynamic.scaffold.inline.DecoratingDynamicTypeBuilder;
import net.bytebuddy.dynamic.scaffold.inline.MethodNameTransformer;
import net.bytebuddy.dynamic.scaffold.inline.RebaseDynamicTypeBuilder;
import net.bytebuddy.dynamic.scaffold.inline.RedefinitionDynamicTypeBuilder;
import net.bytebuddy.dynamic.scaffold.subclass.ConstructorStrategy;
import net.bytebuddy.dynamic.scaffold.subclass.SubclassDynamicTypeBuilder;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.MethodCall;
import net.bytebuddy.implementation.SuperMethodCall;
import net.bytebuddy.implementation.attribute.AnnotationRetention;
import net.bytebuddy.implementation.attribute.AnnotationValueFilter;
import net.bytebuddy.implementation.attribute.MethodAttributeAppender;
import net.bytebuddy.implementation.auxiliary.AuxiliaryType;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import net.bytebuddy.implementation.bytecode.Duplication;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.TypeCreation;
import net.bytebuddy.implementation.bytecode.assign.Assigner;
import net.bytebuddy.implementation.bytecode.assign.TypeCasting;
import net.bytebuddy.implementation.bytecode.collection.ArrayFactory;
import net.bytebuddy.implementation.bytecode.constant.IntegerConstant;
import net.bytebuddy.implementation.bytecode.constant.TextConstant;
import net.bytebuddy.implementation.bytecode.member.FieldAccess;
import net.bytebuddy.implementation.bytecode.member.MethodInvocation;
import net.bytebuddy.implementation.bytecode.member.MethodReturn;
import net.bytebuddy.implementation.bytecode.member.MethodVariableAccess;
import net.bytebuddy.matcher.ElementMatcher;
import net.bytebuddy.matcher.LatentMatcher;
import net.bytebuddy.utility.*;
import net.bytebuddy.utility.nullability.MaybeNull;
import net.bytebuddy.utility.privilege.GetSystemPropertyAction;
import net.bytebuddy.jar.asm.MethodVisitor;
import net.bytebuddy.jar.asm.Opcodes;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.reflect.Type;
import java.security.PrivilegedAction;
import java.util.*;

import static net.bytebuddy.matcher.ElementMatchers.*;

/**
 * Instances of this class serve as a focus point for configuration of the library's behavior and as an entry point
 * to any form of code generation using the library. For this purpose, Byte Buddy offers a fluent API which allows
 * for the step-wise generation of a new Java type. A type is generated either by:
 * 
    *
  • Subclassing some type: A subclass - as the name suggests - extends another, existing Java type. Virtual * members of the generated type's super types can be overridden. Subclasses can also be interface extensions of one * or several interfaces.
  • *
  • Redefining a type: By redefining a type, it is not only possible to override virtual methods of the * redefined type but also to redefine existing methods. This way, it is also possible to change the behavior of * non-virtual methods and constructors of the redefined type.
  • *
  • Rebasing a type: Rebasing a type works similar to creating a subclass, i.e. any method being overridden * is still capable of invoking any original code of the rebased type. Any rebased method is however inlined into the * rebased type and any original code is preserved automatically. This way, the type's identity does not change.
  • *
* Byte Buddy's API does not change when a type is rebased, redefined or subclassed. All types are created via the * {@link net.bytebuddy.dynamic.DynamicType.Builder} interface. Byte Buddy's API is expressed by fully immutable * components and is therefore thread-safe. As a consequence, method calls must be chained for all of Byte Buddy's * component, e.g. a method call like the following has no effect: *
 * ByteBuddy byteBuddy = new ByteBuddy();
 * byteBuddy.foo()
* Instead, the following method chain is correct use of the API: *
 * ByteBuddy byteBuddy = new ByteBuddy().foo();
*

* For the creation of Java agents, Byte Buddy offers a convenience API implemented by the * {@link net.bytebuddy.agent.builder.AgentBuilder}. The API wraps a {@link ByteBuddy} instance and offers agent-specific * configuration opportunities by integrating against the {@link java.lang.instrument.Instrumentation} API. *

* * @see net.bytebuddy.agent.builder.AgentBuilder */ @HashCodeAndEqualsPlugin.Enhance public class ByteBuddy { /** * A property that controls the default naming strategy. If not set, Byte Buddy is generating * random names for types that are not named explicitly. If set to {@code fixed}, Byte Buddy is * setting names deterministically without any random element, or to {@code caller}, if a name * should be fixed but contain the name of the caller class and method. If set to a numeric * value, Byte Buddy is generating random names, using the number as a seed. */ public static final String DEFAULT_NAMING_PROPERTY = "net.bytebuddy.naming"; /** * The default prefix for the default {@link net.bytebuddy.NamingStrategy}. */ private static final String BYTE_BUDDY_DEFAULT_PREFIX = "ByteBuddy"; /** * The default suffix when defining a {@link AuxiliaryType.NamingStrategy}. */ private static final String BYTE_BUDDY_DEFAULT_SUFFIX = "auxiliary"; /** * The default name of a fixed context name for synthetic fields and methods. */ private static final String BYTE_BUDDY_DEFAULT_CONTEXT_NAME = "synthetic"; /** * The default naming strategy or {@code null} if no such strategy is set. */ @MaybeNull private static final NamingStrategy DEFAULT_NAMING_STRATEGY; /** * The default auxiliary naming strategy or {@code null} if no such strategy is set. */ @MaybeNull private static final AuxiliaryType.NamingStrategy DEFAULT_AUXILIARY_NAMING_STRATEGY; /** * The default implementation context factory or {@code null} if no such factory is set. */ @MaybeNull private static final Implementation.Context.Factory DEFAULT_IMPLEMENTATION_CONTEXT_FACTORY; /* * Resolves the default naming strategy. */ static { String value = doPrivileged(new GetSystemPropertyAction(DEFAULT_NAMING_PROPERTY)); NamingStrategy namingStrategy; AuxiliaryType.NamingStrategy auxiliaryNamingStrategy; Implementation.Context.Factory implementationContextFactory; if (value == null) { if (GraalImageCode.getCurrent().isDefined()) { namingStrategy = new NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_PREFIX, new NamingStrategy.Suffixing.BaseNameResolver.WithCallerSuffix(NamingStrategy.Suffixing.BaseNameResolver.ForUnnamedType.INSTANCE), NamingStrategy.BYTE_BUDDY_RENAME_PACKAGE); auxiliaryNamingStrategy = new AuxiliaryType.NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_SUFFIX); implementationContextFactory = new Implementation.Context.Default.Factory.WithFixedSuffix(BYTE_BUDDY_DEFAULT_CONTEXT_NAME); } else { namingStrategy = null; auxiliaryNamingStrategy = null; implementationContextFactory = null; } } else if (value.equalsIgnoreCase("fixed")) { namingStrategy = new NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_PREFIX, NamingStrategy.Suffixing.BaseNameResolver.ForUnnamedType.INSTANCE, NamingStrategy.BYTE_BUDDY_RENAME_PACKAGE); auxiliaryNamingStrategy = new AuxiliaryType.NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_SUFFIX); implementationContextFactory = new Implementation.Context.Default.Factory.WithFixedSuffix(BYTE_BUDDY_DEFAULT_CONTEXT_NAME); } else if (value.equalsIgnoreCase("caller")) { namingStrategy = new NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_PREFIX, new NamingStrategy.Suffixing.BaseNameResolver.WithCallerSuffix(NamingStrategy.Suffixing.BaseNameResolver.ForUnnamedType.INSTANCE), NamingStrategy.BYTE_BUDDY_RENAME_PACKAGE); auxiliaryNamingStrategy = new AuxiliaryType.NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_SUFFIX); implementationContextFactory = new Implementation.Context.Default.Factory.WithFixedSuffix(BYTE_BUDDY_DEFAULT_CONTEXT_NAME); } else { long seed; try { seed = Long.parseLong(value); } catch (Exception ignored) { throw new IllegalStateException("'net.bytebuddy.naming' is set to an unknown, non-numeric value: " + value); } namingStrategy = new NamingStrategy.SuffixingRandom(BYTE_BUDDY_DEFAULT_PREFIX, NamingStrategy.Suffixing.BaseNameResolver.ForUnnamedType.INSTANCE, NamingStrategy.BYTE_BUDDY_RENAME_PACKAGE, new RandomString(RandomString.DEFAULT_LENGTH, new Random(seed))); auxiliaryNamingStrategy = new AuxiliaryType.NamingStrategy.Suffixing(BYTE_BUDDY_DEFAULT_SUFFIX); implementationContextFactory = new Implementation.Context.Default.Factory.WithFixedSuffix(BYTE_BUDDY_DEFAULT_CONTEXT_NAME); } DEFAULT_NAMING_STRATEGY = namingStrategy; DEFAULT_AUXILIARY_NAMING_STRATEGY = auxiliaryNamingStrategy; DEFAULT_IMPLEMENTATION_CONTEXT_FACTORY = implementationContextFactory; } /** * A proxy for {@code java.security.AccessController#doPrivileged} that is activated if available. * * @param action The action to execute from a privileged context. * @param The type of the action's resolved value. * @return The action's resolved value. */ @MaybeNull @AccessControllerPlugin.Enhance private static T doPrivileged(PrivilegedAction action) { return action.run(); } /** * The class file version to use for types that are not based on an existing class file. */ protected final ClassFileVersion classFileVersion; /** * The naming strategy to use. */ protected final NamingStrategy namingStrategy; /** * The naming strategy to use for naming auxiliary types. */ protected final AuxiliaryType.NamingStrategy auxiliaryTypeNamingStrategy; /** * The annotation value filter factory to use. */ protected final AnnotationValueFilter.Factory annotationValueFilterFactory; /** * The annotation retention strategy to use. */ protected final AnnotationRetention annotationRetention; /** * The implementation context factory to use. */ protected final Implementation.Context.Factory implementationContextFactory; /** * The method graph compiler to use. */ protected final MethodGraph.Compiler methodGraphCompiler; /** * The instrumented type factory to use. */ protected final InstrumentedType.Factory instrumentedTypeFactory; /** * A matcher for identifying methods that should be excluded from instrumentation. */ protected final LatentMatcher ignoredMethods; /** * Determines if a type should be explicitly validated. */ protected final TypeValidation typeValidation; /** * The visibility bridge strategy to apply. */ protected final VisibilityBridgeStrategy visibilityBridgeStrategy; /** * The class writer strategy to use. */ protected final ClassWriterStrategy classWriterStrategy; /** *

* Creates a new Byte Buddy instance with a default configuration that is suitable for most use cases. *

*

* When creating this configuration, Byte Buddy attempts to discover the current JVM's version. If this * is not possible, class files are created Java 6-compatible. *

* * @see ClassFileVersion#ofThisVm(ClassFileVersion) */ public ByteBuddy() { this(ClassFileVersion.ofThisVm(ClassFileVersion.JAVA_V5)); } /** * Creates a new Byte Buddy instance with a default configuration that is suitable for most use cases. * * @param classFileVersion The class file version to use for types that are not based on an existing class file. */ public ByteBuddy(ClassFileVersion classFileVersion) { this(classFileVersion, DEFAULT_NAMING_STRATEGY == null ? new NamingStrategy.SuffixingRandom(BYTE_BUDDY_DEFAULT_PREFIX) : DEFAULT_NAMING_STRATEGY, DEFAULT_AUXILIARY_NAMING_STRATEGY == null ? new AuxiliaryType.NamingStrategy.SuffixingRandom(BYTE_BUDDY_DEFAULT_SUFFIX) : DEFAULT_AUXILIARY_NAMING_STRATEGY, AnnotationValueFilter.Default.APPEND_DEFAULTS, AnnotationRetention.ENABLED, DEFAULT_IMPLEMENTATION_CONTEXT_FACTORY == null ? Implementation.Context.Default.Factory.INSTANCE : DEFAULT_IMPLEMENTATION_CONTEXT_FACTORY, MethodGraph.Compiler.DEFAULT, InstrumentedType.Factory.Default.MODIFIABLE, TypeValidation.ENABLED, VisibilityBridgeStrategy.Default.ALWAYS, ClassWriterStrategy.Default.CONSTANT_POOL_RETAINING, new LatentMatcher.Resolved(isSynthetic().or(isDefaultFinalizer()))); } /** * Creates a new Byte Buddy instance. * * @param classFileVersion The class file version to use for types that are not based on an existing class file. * @param namingStrategy The naming strategy to use. * @param auxiliaryTypeNamingStrategy The naming strategy to use for naming auxiliary types. * @param annotationValueFilterFactory The annotation value filter factory to use. * @param annotationRetention The annotation retention strategy to use. * @param implementationContextFactory The implementation context factory to use. * @param methodGraphCompiler The method graph compiler to use. * @param instrumentedTypeFactory The instrumented type factory to use. * @param typeValidation Determines if a type should be explicitly validated. * @param visibilityBridgeStrategy The visibility bridge strategy to apply. * @param classWriterStrategy The class writer strategy to use. * @param ignoredMethods A matcher for identifying methods that should be excluded from instrumentation. */ protected ByteBuddy(ClassFileVersion classFileVersion, NamingStrategy namingStrategy, AuxiliaryType.NamingStrategy auxiliaryTypeNamingStrategy, AnnotationValueFilter.Factory annotationValueFilterFactory, AnnotationRetention annotationRetention, Implementation.Context.Factory implementationContextFactory, MethodGraph.Compiler methodGraphCompiler, InstrumentedType.Factory instrumentedTypeFactory, TypeValidation typeValidation, VisibilityBridgeStrategy visibilityBridgeStrategy, ClassWriterStrategy classWriterStrategy, LatentMatcher ignoredMethods) { this.classFileVersion = classFileVersion; this.namingStrategy = namingStrategy; this.auxiliaryTypeNamingStrategy = auxiliaryTypeNamingStrategy; this.annotationValueFilterFactory = annotationValueFilterFactory; this.annotationRetention = annotationRetention; this.implementationContextFactory = implementationContextFactory; this.methodGraphCompiler = methodGraphCompiler; this.instrumentedTypeFactory = instrumentedTypeFactory; this.typeValidation = typeValidation; this.visibilityBridgeStrategy = visibilityBridgeStrategy; this.classWriterStrategy = classWriterStrategy; this.ignoredMethods = ignoredMethods; } /** *

* Creates a new builder for subclassing the provided type. If the provided type is an interface, a new class implementing * this interface type is created. *

*

* When extending a class, Byte Buddy imitates all visible constructors of the subclassed type. Any constructor is implemented * to only invoke its super type constructor of equal signature. Another behavior can be specified by supplying an explicit * {@link ConstructorStrategy} by {@link ByteBuddy#subclass(Class, ConstructorStrategy)}. *

*

* Note: This methods implements the supplied types in a generified state if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param superType The super class or interface type to extend. * @param A loaded type that the generated class is guaranteed to inherit. * @return A type builder for creating a new class extending the provided class or interface. */ @SuppressWarnings("unchecked") public DynamicType.Builder subclass(Class superType) { return (DynamicType.Builder) subclass(TypeDescription.ForLoadedType.of(superType)); } /** *

* Creates a new builder for subclassing the provided type. If the provided type is an interface, a new class implementing * this interface type is created. *

*

* Note: This methods implements the supplied types in a generified state if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param superType The super class or interface type to extend. * @param constructorStrategy A constructor strategy that determines the * @param A loaded type that the generated class is guaranteed to inherit. * @return A type builder for creating a new class extending the provided class or interface. */ @SuppressWarnings("unchecked") public DynamicType.Builder subclass(Class superType, ConstructorStrategy constructorStrategy) { return (DynamicType.Builder) subclass(TypeDescription.ForLoadedType.of(superType), constructorStrategy); } /** *

* Creates a new builder for subclassing the provided type. If the provided type is an interface, a new class implementing * this interface type is created. *

*

* When extending a class, Byte Buddy imitates all visible constructors of the subclassed type. Any constructor is implemented * to only invoke its super type constructor of equal signature. Another behavior can be specified by supplying an explicit * {@link ConstructorStrategy} by {@link ByteBuddy#subclass(Type, ConstructorStrategy)}. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link Class} values are implemented * as raw types if they declare type variables. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param superType The super class or interface type to extend. The type must be a raw type or parameterized type. All type * variables that are referenced by the generic type must be declared by the generated subclass before creating * the type. * @return A type builder for creating a new class extending the provided class or interface. */ public DynamicType.Builder subclass(Type superType) { return subclass(TypeDefinition.Sort.describe(superType)); } /** *

* Creates a new builder for subclassing the provided type. If the provided type is an interface, a new class implementing * this interface type is created. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link Class} values are implemented * as raw types if they declare type variables. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param superType The super class or interface type to extend. The type must be a raw type or parameterized * type. All type variables that are referenced by the generic type must be declared by the * generated subclass before creating the type. * @param constructorStrategy A constructor strategy that determines the * @return A type builder for creating a new class extending the provided class or interface. */ public DynamicType.Builder subclass(Type superType, ConstructorStrategy constructorStrategy) { return subclass(TypeDefinition.Sort.describe(superType), constructorStrategy); } /** *

* Creates a new builder for subclassing the provided type. If the provided type is an interface, a new class implementing * this interface type is created. *

*

* When extending a class, Byte Buddy imitates all visible constructors of the subclassed type and sets them to be {@code public}. * Any constructor is implemented to only invoke its super type constructor of equal signature. Another behavior can be specified by * supplying an explicit {@link ConstructorStrategy} by {@link ByteBuddy#subclass(TypeDefinition, ConstructorStrategy)}. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link TypeDescription} values are implemented * as raw types if they declare type variables. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param superType The super class or interface type to extend. The type must be a raw type or parameterized type. All type * variables that are referenced by the generic type must be declared by the generated subclass before creating * the type. * @return A type builder for creating a new class extending the provided class or interface. */ public DynamicType.Builder subclass(TypeDefinition superType) { return subclass(superType, ConstructorStrategy.Default.IMITATE_SUPER_CLASS_OPENING); } /** *

* Creates a new builder for subclassing the provided type. If the provided type is an interface, a new class implementing * this interface type is created. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link TypeDescription} values are implemented * as raw types if they declare type variables. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param superType The super class or interface type to extend. The type must be a raw type or parameterized * type. All type variables that are referenced by the generic type must be declared by the * generated subclass before creating the type. * @param constructorStrategy A constructor strategy that determines the * @return A type builder for creating a new class extending the provided class or interface. */ public DynamicType.Builder subclass(TypeDefinition superType, ConstructorStrategy constructorStrategy) { TypeDescription.Generic actualSuperType; TypeList.Generic interfaceTypes; if (superType.isPrimitive() || superType.isArray() || superType.isFinal()) { throw new IllegalArgumentException("Cannot subclass primitive, array or final types: " + superType); } else if (superType.isInterface()) { actualSuperType = TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class); interfaceTypes = new TypeList.Generic.Explicit(superType); } else { actualSuperType = superType.asGenericType(); interfaceTypes = new TypeList.Generic.Empty(); } return new SubclassDynamicTypeBuilder(instrumentedTypeFactory.subclass(namingStrategy.subclass(superType.asGenericType()), ModifierContributor.Resolver.of(Visibility.PUBLIC, TypeManifestation.PLAIN).resolve(superType.getModifiers()), actualSuperType).withInterfaces(interfaceTypes), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, constructorStrategy); } /** *

* Creates a new, plain interface type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @return A type builder that creates a new interface type. */ public DynamicType.Builder makeInterface() { return makeInterface(Collections.emptyList()); } /** *

* Creates a new interface type that extends the provided interface. *

*

* Note: This methods implements the supplied types in a generified state if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param interfaceType An interface type that the generated interface implements. * @param A loaded type that the generated interface is guaranteed to inherit. * @return A type builder that creates a new interface type. */ @SuppressWarnings("unchecked") public DynamicType.Builder makeInterface(Class interfaceType) { return (DynamicType.Builder) makeInterface(Collections.singletonList(interfaceType)); } /** *

* Creates a new interface type that extends the provided interface. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link Class} values are implemented * as raw types if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param interfaceType The interface types to implement. The types must be raw or parameterized types. All type * variables that are referenced by a parameterized type must be declared by the generated * subclass before creating the type. * @return A type builder that creates a new interface type. */ public DynamicType.Builder makeInterface(Type... interfaceType) { return makeInterface(Arrays.asList(interfaceType)); } /** *

* Creates a new interface type that extends the provided interface. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link Class} values are implemented * as raw types if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param interfaceTypes The interface types to implement. The types must be raw or parameterized types. All * type variables that are referenced by a parameterized type must be declared by the * generated subclass before creating the type. * @return A type builder that creates a new interface type. */ public DynamicType.Builder makeInterface(List interfaceTypes) { return makeInterface(new TypeList.Generic.ForLoadedTypes(interfaceTypes)); } /** *

* Creates a new interface type that extends the provided interface. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link TypeDescription} values are implemented * as raw types if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param interfaceType The interface types to implement. The types must be raw or parameterized types. All * type variables that are referenced by a parameterized type must be declared by the * generated subclass before creating the type. * @return A type builder that creates a new interface type. */ public DynamicType.Builder makeInterface(TypeDefinition... interfaceType) { return makeInterface(Arrays.asList(interfaceType)); } /** *

* Creates a new interface type that extends the provided interface. *

*

* Note: This methods implements the supplied types as is, i.e. any {@link TypeDescription} values are implemented * as raw types if they declare type variables or an owner type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param interfaceTypes The interface types to implement. The types must be raw or parameterized types. All * type variables that are referenced by a parameterized type must be declared by the * generated subclass before creating the type. * @return A type builder that creates a new interface type. */ public DynamicType.Builder makeInterface(Collection interfaceTypes) { return subclass(Object.class, ConstructorStrategy.Default.NO_CONSTRUCTORS).implement(interfaceTypes).modifiers(TypeManifestation.INTERFACE, Visibility.PUBLIC); } /** *

* Creates a new package definition. Package definitions are defined by classes named {@code package-info} * without any methods or fields but permit annotations. Any field or method definition will cause an * {@link IllegalStateException} to be thrown when the type is created. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param name The fully qualified name of the package. * @return A type builder that creates a {@code package-info} class file. */ public DynamicType.Builder makePackage(String name) { return new SubclassDynamicTypeBuilder(instrumentedTypeFactory.subclass(name + "." + PackageDescription.PACKAGE_CLASS_NAME, PackageDescription.PACKAGE_MODIFIERS, TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class)), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, ConstructorStrategy.Default.NO_CONSTRUCTORS); } /** * Creates a new Java record. This builder automatically defines fields for record members, standard accessors and a record constructor for any * defined record component. * * @return A dynamic type builder that creates a record. */ public DynamicType.Builder makeRecord() { TypeDescription.Generic record = InstrumentedType.Default.of(JavaType.RECORD.getTypeStub().getName(), TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class), Visibility.PUBLIC) .withMethod(new MethodDescription.Token(Opcodes.ACC_PROTECTED)) .withMethod(new MethodDescription.Token("hashCode", Opcodes.ACC_PUBLIC | Opcodes.ACC_ABSTRACT, TypeDescription.ForLoadedType.of(int.class).asGenericType())) .withMethod(new MethodDescription.Token("equals", Opcodes.ACC_PUBLIC | Opcodes.ACC_ABSTRACT, TypeDescription.ForLoadedType.of(boolean.class).asGenericType(), Collections.singletonList(TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class)))) .withMethod(new MethodDescription.Token("toString", Opcodes.ACC_PUBLIC | Opcodes.ACC_ABSTRACT, TypeDescription.ForLoadedType.of(String.class).asGenericType())) .asGenericType(); return new SubclassDynamicTypeBuilder(instrumentedTypeFactory.subclass(namingStrategy.subclass(record), Opcodes.ACC_PUBLIC | Opcodes.ACC_FINAL, record).withRecord(true), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, RecordConstructorStrategy.INSTANCE) .method(isHashCode()).intercept(RecordObjectMethod.HASH_CODE) .method(isEquals()).intercept(RecordObjectMethod.EQUALS) .method(isToString()).intercept(RecordObjectMethod.TO_STRING); } /** *

* Creates a new {@link Annotation} type. Annotation properties are implemented as non-static, public methods with the * property type being defined as the return type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @return A type builder that creates a new {@link Annotation} type. */ public DynamicType.Builder makeAnnotation() { return new SubclassDynamicTypeBuilder(instrumentedTypeFactory.subclass(namingStrategy.subclass(TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Annotation.class)), ModifierContributor.Resolver.of(Visibility.PUBLIC, TypeManifestation.ANNOTATION).resolve(), TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class)).withInterfaces(new TypeList.Generic.Explicit(TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Annotation.class))), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, ConstructorStrategy.Default.NO_CONSTRUCTORS); } /** *

* Creates a new {@link Enum} type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param value The names of the type's enumeration constants * @return A type builder for creating an enumeration type. */ public DynamicType.Builder> makeEnumeration(String... value) { return makeEnumeration(Arrays.asList(value)); } /** *

* Creates a new {@link Enum} type. *

*

* Note: Byte Buddy does not cache previous subclasses but will attempt the generation of a new subclass. For caching * types, a external cache or {@link TypeCache} should be used. *

* * @param values The names of the type's enumeration constants * @return A type builder for creating an enumeration type. */ public DynamicType.Builder> makeEnumeration(Collection values) { if (values.isEmpty()) { throw new IllegalArgumentException("Require at least one enumeration constant"); } TypeDescription.Generic enumType = TypeDescription.Generic.Builder.parameterizedType(Enum.class, TargetType.class).build(); return new SubclassDynamicTypeBuilder>(instrumentedTypeFactory.subclass(namingStrategy.subclass(enumType), ModifierContributor.Resolver.of(Visibility.PUBLIC, TypeManifestation.FINAL, EnumerationState.ENUMERATION).resolve(), enumType), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, ConstructorStrategy.Default.NO_CONSTRUCTORS) .defineConstructor(Visibility.PRIVATE).withParameters(String.class, int.class) .intercept(SuperMethodCall.INSTANCE) .defineMethod(EnumerationImplementation.ENUM_VALUE_OF_METHOD_NAME, TargetType.class, Visibility.PUBLIC, Ownership.STATIC).withParameters(String.class) .intercept(MethodCall.invoke(enumType.getDeclaredMethods() .filter(named(EnumerationImplementation.ENUM_VALUE_OF_METHOD_NAME).and(takesArguments(Class.class, String.class))).getOnly()) .withOwnType().withArgument(0) .withAssigner(Assigner.DEFAULT, Assigner.Typing.DYNAMIC)) .defineMethod(EnumerationImplementation.ENUM_VALUES_METHOD_NAME, TargetType[].class, Visibility.PUBLIC, Ownership.STATIC) .intercept(new EnumerationImplementation(new ArrayList(values))); } /** *

* Redefines the given type where any intercepted method that is declared by the redefined type is fully replaced * by the new implementation. *

*

* The class file of the redefined type is located by querying the redefined type's class loader by name. For specifying an * alternative {@link ClassFileLocator}, use {@link ByteBuddy#redefine(Class, ClassFileLocator)}. *

*

* Note: When a user redefines a class with the purpose of reloading this class using a {@link net.bytebuddy.dynamic.loading.ClassReloadingStrategy}, * it is important that no fields or methods are added to the redefined class. Note that some {@link Implementation}s implicitly add fields or methods. * Finally, Byte Buddy might be forced to add a method if a redefined class already defines a class initializer. This can be disabled by setting * {@link ByteBuddy#with(Implementation.Context.Factory)} to use a {@link net.bytebuddy.implementation.Implementation.Context.Disabled.Factory} * where the class initializer is retained as is. *

* * @param type The type that is being redefined. * @param The loaded type of the redefined type. * @return A type builder for redefining the provided type. */ public DynamicType.Builder redefine(Class type) { return redefine(type, ClassFileLocator.ForClassLoader.of(type.getClassLoader())); } /** *

* Redefines the given type where any intercepted method that is declared by the redefined type is fully replaced * by the new implementation. *

*

* Note: When a user redefines a class with the purpose of reloading this class using a {@link net.bytebuddy.dynamic.loading.ClassReloadingStrategy}, * it is important that no fields or methods are added to the redefined class. Note that some {@link Implementation}s implicitly add fields or methods. * Finally, Byte Buddy might be forced to add a method if a redefined class already defines a class initializer. This can be disabled by setting * {@link ByteBuddy#with(Implementation.Context.Factory)} to use a {@link net.bytebuddy.implementation.Implementation.Context.Disabled.Factory} * where the class initializer is retained as is. *

* * @param type The type that is being redefined. * @param classFileLocator The class file locator that is queried for the redefined type's class file. * @param The loaded type of the redefined type. * @return A type builder for redefining the provided type. */ public DynamicType.Builder redefine(Class type, ClassFileLocator classFileLocator) { return redefine(TypeDescription.ForLoadedType.of(type), classFileLocator); } /** *

* Redefines the given type where any intercepted method that is declared by the redefined type is fully replaced * by the new implementation. *

*

* Note: When a user redefines a class with the purpose of reloading this class using a {@link net.bytebuddy.dynamic.loading.ClassReloadingStrategy}, * it is important that no fields or methods are added to the redefined class. Note that some {@link Implementation}s implicitly add fields or methods. * Finally, Byte Buddy might be forced to add a method if a redefined class already defines a class initializer. This can be disabled by setting * {@link ByteBuddy#with(Implementation.Context.Factory)} to use a {@link net.bytebuddy.implementation.Implementation.Context.Disabled.Factory} * where the class initializer is retained as is. *

* * @param type The type that is being redefined. * @param classFileLocator The class file locator that is queried for the redefined type's class file. * @param The loaded type of the redefined type. * @return A type builder for redefining the provided type. */ public DynamicType.Builder redefine(TypeDescription type, ClassFileLocator classFileLocator) { if (type.isArray() || type.isPrimitive()) { throw new IllegalArgumentException("Cannot redefine array or primitive type: " + type); } return new RedefinitionDynamicTypeBuilder(instrumentedTypeFactory.represent(type), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, type, classFileLocator); } /** *

* Rebases the given type where any intercepted method that is declared by the redefined type is preserved within the * rebased type's class such that the class's original can be invoked from the new method implementations. Rebasing a * type can be seen similarly to creating a subclass where the subclass is later merged with the original class file. *

*

* The class file of the rebased type is located by querying the rebased type's class loader by name. For specifying an * alternative {@link ClassFileLocator}, use {@link ByteBuddy#redefine(Class, ClassFileLocator)}. *

* * @param type The type that is being rebased. * @param The loaded type of the rebased type. * @return A type builder for rebasing the provided type. */ public DynamicType.Builder rebase(Class type) { return rebase(type, ClassFileLocator.ForClassLoader.of(type.getClassLoader())); } /** *

* Rebases the given type where any intercepted method that is declared by the redefined type is preserved within the * rebased type's class such that the class's original can be invoked from the new method implementations. Rebasing a * type can be seen similarly to creating a subclass where the subclass is later merged with the original class file. *

*

* When a method is rebased, the original method is copied into a new method with a different name. These names are * generated automatically by Byte Buddy unless a {@link MethodNameTransformer} is specified explicitly. * Use {@link ByteBuddy#rebase(Class, ClassFileLocator, MethodNameTransformer)} for doing so. *

* * @param type The type that is being rebased. * @param classFileLocator The class file locator that is queried for the rebased type's class file. * @param The loaded type of the rebased type. * @return A type builder for rebasing the provided type. */ public DynamicType.Builder rebase(Class type, ClassFileLocator classFileLocator) { return rebase(TypeDescription.ForLoadedType.of(type), classFileLocator); } /** * Rebases the given type where any intercepted method that is declared by the redefined type is preserved within the * rebased type's class such that the class's original can be invoked from the new method implementations. Rebasing a * type can be seen similarly to creating a subclass where the subclass is later merged with the original class file. * * @param type The type that is being rebased. * @param classFileLocator The class file locator that is queried for the rebased type's class file. * @param methodNameTransformer The method name transformer for renaming a method that is rebased. * @param The loaded type of the rebased type. * @return A type builder for rebasing the provided type. */ public DynamicType.Builder rebase(Class type, ClassFileLocator classFileLocator, MethodNameTransformer methodNameTransformer) { return rebase(TypeDescription.ForLoadedType.of(type), classFileLocator, methodNameTransformer); } /** *

* Rebases the given type where any intercepted method that is declared by the redefined type is preserved within the * rebased type's class such that the class's original can be invoked from the new method implementations. Rebasing a * type can be seen similarly to creating a subclass where the subclass is later merged with the original class file. *

*

* When a method is rebased, the original method is copied into a new method with a different name. These names are * generated automatically by Byte Buddy unless a {@link MethodNameTransformer} is specified explicitly. * Use {@link ByteBuddy#rebase(TypeDescription, ClassFileLocator, MethodNameTransformer)} for doing so. *

* * @param type The type that is being rebased. * @param classFileLocator The class file locator that is queried for the rebased type's class file. * @param The loaded type of the rebased type. * @return A type builder for rebasing the provided type. */ public DynamicType.Builder rebase(TypeDescription type, ClassFileLocator classFileLocator) { return rebase(type, classFileLocator, MethodNameTransformer.Suffixing.withRandomSuffix()); } /** * Rebases the given type where any intercepted method that is declared by the redefined type is preserved within the * rebased type's class such that the class's original can be invoked from the new method implementations. Rebasing a * type can be seen similarly to creating a subclass where the subclass is later merged with the original class file. * * @param type The type that is being rebased. * @param classFileLocator The class file locator that is queried for the rebased type's class file. * @param methodNameTransformer The method name transformer for renaming a method that is rebased. * @param The loaded type of the rebased type. * @return A type builder for rebasing the provided type. */ public DynamicType.Builder rebase(TypeDescription type, ClassFileLocator classFileLocator, MethodNameTransformer methodNameTransformer) { if (type.isArray() || type.isPrimitive()) { throw new IllegalArgumentException("Cannot rebase array or primitive type: " + type); } return new RebaseDynamicTypeBuilder(instrumentedTypeFactory.represent(type), classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods, type, classFileLocator, methodNameTransformer); } /** * Rebases a package. This offers an opportunity to add annotations to the package definition. Packages are defined * by classes named {@code package-info} without any methods or fields but permit annotations. Any field or method * definition will cause an {@link IllegalStateException} to be thrown when the type is created. * * @param aPackage The package that is being rebased. * @param classFileLocator The class file locator to use for locating the package's class file. * @return A type builder for rebasing the given package. */ public DynamicType.Builder rebase(Package aPackage, ClassFileLocator classFileLocator) { return rebase(new PackageDescription.ForLoadedPackage(aPackage), classFileLocator); } /** * Rebases a package. This offers an opportunity to add annotations to the package definition. Packages are defined * by classes named {@code package-info} without any methods or fields but permit annotations. Any field or method * definition will cause an {@link IllegalStateException} to be thrown when the type is created. * * @param aPackage The package that is being rebased. * @param classFileLocator The class file locator to use for locating the package's class file. * @return A type builder for rebasing the given package. */ public DynamicType.Builder rebase(PackageDescription aPackage, ClassFileLocator classFileLocator) { return rebase(new TypeDescription.ForPackageDescription(aPackage), classFileLocator); } /** *

* Decorates a type with {@link net.bytebuddy.asm.AsmVisitorWrapper} and allows adding attributes and annotations. A decoration does * not allow for any standard transformations but can be used as a performance optimization compared to a redefinition, especially * when implementing a Java agent that only applies ASM-based code changes. *

*

* Important: Only use this mode to improve performance in a narrowly defined transformation. Using other features as those mentioned * might result in an unexpected outcome of the transformation or error. Using decoration also requires the configuration of an * {@link Implementation.Context.Factory} that does not attempt any type transformation. *

* * @param type The type to decorate. * @param The loaded type of the decorated type. * @return A type builder for decorating the provided type. */ public DynamicType.Builder decorate(Class type) { return decorate(type, ClassFileLocator.ForClassLoader.of(type.getClassLoader())); } /** *

* Decorates a type with {@link net.bytebuddy.asm.AsmVisitorWrapper} and allows adding attributes and annotations. A decoration does * not allow for any standard transformations but can be used as a performance optimization compared to a redefinition, especially * when implementing a Java agent that only applies ASM-based code changes. *

*

* Important: Only use this mode to improve performance in a narrowly defined transformation. Using other features as those mentioned * might result in an unexpected outcome of the transformation or error. Using decoration also requires the configuration of an * {@link Implementation.Context.Factory} that does not attempt any type transformation. *

* * @param type The type to decorate. * @param classFileLocator The class file locator to use. * @param The loaded type of the decorated type. * @return A type builder for decorating the provided type. */ public DynamicType.Builder decorate(Class type, ClassFileLocator classFileLocator) { return decorate(TypeDescription.ForLoadedType.of(type), classFileLocator); } /** *

* Decorates a type with {@link net.bytebuddy.asm.AsmVisitorWrapper} and allows adding attributes and annotations. A decoration does * not allow for any standard transformations but can be used as a performance optimization compared to a redefinition, especially * when implementing a Java agent that only applies ASM-based code changes. *

*

* Important: Only use this mode to improve performance in a narrowly defined transformation. Using other features as those mentioned * might result in an unexpected outcome of the transformation or error. Using decoration also requires the configuration of an * {@link Implementation.Context.Factory} that does not attempt any type transformation. *

* * @param type The type to decorate. * @param classFileLocator The class file locator to use. * @param The loaded type of the decorated type. * @return A type builder for decorating the provided type. */ public DynamicType.Builder decorate(TypeDescription type, ClassFileLocator classFileLocator) { if (type.isArray() || type.isPrimitive()) { throw new IllegalArgumentException("Cannot decorate array or primitive type: " + type); } return new DecoratingDynamicTypeBuilder(type, classFileVersion, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, typeValidation, classWriterStrategy, ignoredMethods, classFileLocator); } /** * Creates a new configuration where all class files that are not based on an existing class file are created * using the supplied class file version. When creating a Byte Buddy instance by {@link ByteBuddy#ByteBuddy()}, the class * file version is detected automatically. If the class file version is known before creating a Byte Buddy instance, the * {@link ByteBuddy#ByteBuddy(ClassFileVersion)} constructor should be used. * * @param classFileVersion The class file version to use for types that are not based on an existing class file. * @return A new Byte Buddy instance that uses the supplied class file version. */ public ByteBuddy with(ClassFileVersion classFileVersion) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration where new types are named by applying the given naming strategy. By default, Byte Buddy * simply retains the name of rebased and redefined types but adds a random suffix to the name of created subclasses or * -interfaces. If a type is defined within the {@code java.*} namespace, Byte Buddy also adds a suffix to the generated * class because this namespace is only available for the bootstrap class loader. * * @param namingStrategy The naming strategy to apply when creating a new dynamic type. * @return A new Byte Buddy instance that uses the supplied naming strategy. */ public ByteBuddy with(NamingStrategy namingStrategy) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration where auxiliary types are named by applying the given naming strategy. Auxiliary types * are helper types that might be required for implementing certain {@link Implementation}s. By default, Byte Buddy * adds a random suffix to the instrumented type's name when naming its auxiliary types. * * @param auxiliaryTypeNamingStrategy The naming strategy to apply when creating a new auxiliary type. * @return A new Byte Buddy instance that uses the supplied naming strategy for auxiliary types. */ public ByteBuddy with(AuxiliaryType.NamingStrategy auxiliaryTypeNamingStrategy) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration where annotation values are written according to the given filter factory. Using * a filter factory, it is for example possible not to include certain values into a class file such that the * runtime returns an annotation type's default value. By default, Byte Buddy includes all values into a class file, * also such values for which a default value exists. * * @param annotationValueFilterFactory The annotation value filter factory to use. * @return A new Byte Buddy instance that uses the supplied annotation value filter factory. */ public ByteBuddy with(AnnotationValueFilter.Factory annotationValueFilterFactory) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** *

* Creates a new configuration where annotations that are found in an existing class file are or are not preserved * in the format they are discovered, i.e. rewritten in the format they were already present in the class file. * By default, Byte Buddy retains annotations when a class is rebased or redefined. *

*

* Warning: Retaining annotations can cause problems when annotations of a field or method are added based * on the annotations of a matched method. Doing so, Byte Buddy might write the annotations of the field or method * explicitly to a class file while simultaneously retaining the existing annotation what results in duplicates. * When matching fields or methods while adding annotations, disabling annotation retention might be required. *

* * @param annotationRetention The annotation retention strategy to use. * @return A new Byte Buddy instance that uses the supplied annotation retention strategy. */ public ByteBuddy with(AnnotationRetention annotationRetention) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration where the {@link net.bytebuddy.implementation.Implementation.Context} of any created * type is a product of the given implementation context factory. An implementation context might imply unwanted * side-effects, for example, the creation of an additional synthetic methods in order to support specific features * for realizing an {@link Implementation}. By default, Byte Buddy supplies a factory that enables all features. When * redefining a loaded class, it is however required by the JVM that no additional members are added such that a * {@link net.bytebuddy.implementation.Implementation.Context.Disabled} factory might be more appropriate. * * @param implementationContextFactory The implementation context factory to use for defining an instrumented type. * @return A new Byte Buddy instance that uses the supplied implementation context factory. */ public ByteBuddy with(Implementation.Context.Factory implementationContextFactory) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration where the {@link MethodGraph.Compiler} is used for creating a {@link MethodGraph} * of the instrumented type. A method graph is a representation of a type's virtual methods, including all information * on bridge methods that are inserted by the Java compiler. Creating a method graph is a rather expensive operation * and more efficient strategies might exist for certain types or ava types that are created by alternative JVM * languages. By default, a general purpose method graph compiler is used that uses the information that is exposed * by the generic type information that is embedded in any class file. * * @param methodGraphCompiler The method graph compiler to use for analyzing the instrumented type. * @return A new Byte Buddy instance that uses the supplied method graph compiler. */ public ByteBuddy with(MethodGraph.Compiler methodGraphCompiler) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Configures Byte Buddy to use the specified factory for creating {@link InstrumentedType}s. Doing so, more efficient * representations can be chosen when only certain operations are required. By default, all operations are supported. * * @param instrumentedTypeFactory The factory to use when creating instrumented types. * @return A new Byte Buddy instance that uses the supplied factory for creating instrumented types. */ public ByteBuddy with(InstrumentedType.Factory instrumentedTypeFactory) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration that applies the supplied type validation. By default, explicitly type validation is applied * by Byte Buddy but it might be disabled for performance reason or for voluntarily creating illegal types. The Java virtual * machine applies its own type validation where some {@link Error} is thrown if a type is invalid, while Byte Buddy throws * some {@link RuntimeException}. * * @param typeValidation The type validation to apply during type creation. * @return A new Byte Buddy instance that applies the supplied type validation. */ public ByteBuddy with(TypeValidation typeValidation) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration that applies the supplied visibility bridge strategy. By default, visibility bridges * are create for all methods for which a visibility bridge is normally necessary. * * @param visibilityBridgeStrategy The visibility bridge strategy to apply. * @return A new Byte Buddy instance that applies the supplied visibility bridge strategy. */ public ByteBuddy with(VisibilityBridgeStrategy visibilityBridgeStrategy) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration that applies the supplied class writer strategy. By default, the constant pool of redefined and retransformed * classes is retained as most changes are additive and this retention improves performance. * * @param classWriterStrategy The class writer strategy to apply during type creation. * @return A new Byte Buddy instance that applies the supplied class writer strategy. */ public ByteBuddy with(ClassWriterStrategy classWriterStrategy) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * Creates a new configuration where any {@link MethodDescription} that matches the provided method matcher is excluded * from instrumentation. Any previous matcher for ignored methods is replaced. By default, Byte Buddy ignores any * synthetic method (bridge methods are handled automatically) and the {@link Object#finalize()} method. * * @param ignoredMethods A matcher for identifying methods to be excluded from instrumentation. * @return A new Byte Buddy instance that excludes any method from instrumentation if it is matched by the supplied matcher. */ @SuppressWarnings("overloads") public ByteBuddy ignore(ElementMatcher ignoredMethods) { return ignore(new LatentMatcher.Resolved(ignoredMethods)); } /** *

* Creates a new configuration where any {@link MethodDescription} that matches the provided method matcher is excluded * from instrumentation. Any previous matcher for ignored methods is replaced. By default, Byte Buddy ignores any * synthetic method (bridge methods are handled automatically) and the {@link Object#finalize()} method. Using a latent * matcher gives opportunity to resolve an {@link ElementMatcher} based on the instrumented type before applying the matcher. *

* * @param ignoredMethods A matcher for identifying methods to be excluded from instrumentation. * @return A new Byte Buddy instance that excludes any method from instrumentation if it is matched by the supplied matcher. */ @SuppressWarnings("overloads") public ByteBuddy ignore(LatentMatcher ignoredMethods) { return new ByteBuddy(classFileVersion, namingStrategy, auxiliaryTypeNamingStrategy, annotationValueFilterFactory, annotationRetention, implementationContextFactory, methodGraphCompiler, instrumentedTypeFactory, typeValidation, visibilityBridgeStrategy, classWriterStrategy, ignoredMethods); } /** * An implementation fo the {@code values} method of an enumeration type. */ @HashCodeAndEqualsPlugin.Enhance protected static class EnumerationImplementation implements Implementation { /** * The name of the {@link java.lang.Object#clone()} method. */ protected static final String CLONE_METHOD_NAME = "clone"; /** * The name of the {@code valueOf} method that is defined for any enumeration. */ protected static final String ENUM_VALUE_OF_METHOD_NAME = "valueOf"; /** * The name of the {@code values} method that is defined for any enumeration. */ protected static final String ENUM_VALUES_METHOD_NAME = "values"; /** * The field modifiers to use for any field that is added to an enumeration. */ private static final int ENUM_FIELD_MODIFIERS = Opcodes.ACC_FINAL | Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC; /** * The name of the field containing an array of all enumeration values. */ private static final String ENUM_VALUES = "$VALUES"; /** * The names of the enumerations to define for the enumeration. */ private final List values; /** * Creates a new implementation of an enumeration type. * * @param values The values of the enumeration. */ protected EnumerationImplementation(List values) { this.values = values; } /** * {@inheritDoc} */ public InstrumentedType prepare(InstrumentedType instrumentedType) { for (String value : values) { instrumentedType = instrumentedType.withField(new FieldDescription.Token(value, ENUM_FIELD_MODIFIERS | Opcodes.ACC_ENUM, TargetType.DESCRIPTION.asGenericType())); } return instrumentedType .withField(new FieldDescription.Token(ENUM_VALUES, ENUM_FIELD_MODIFIERS | Opcodes.ACC_SYNTHETIC, TypeDescription.ArrayProjection.of(TargetType.DESCRIPTION).asGenericType())) .withInitializer(new InitializationAppender(values)); } /** * {@inheritDoc} */ public ByteCodeAppender appender(Target implementationTarget) { return new ValuesMethodAppender(implementationTarget.getInstrumentedType()); } /** * A byte code appender for the {@code values} method of any enumeration type. */ @HashCodeAndEqualsPlugin.Enhance protected static class ValuesMethodAppender implements ByteCodeAppender { /** * The instrumented enumeration type. */ private final TypeDescription instrumentedType; /** * Creates a new appender for the {@code values} method. * * @param instrumentedType The instrumented enumeration type. */ protected ValuesMethodAppender(TypeDescription instrumentedType) { this.instrumentedType = instrumentedType; } /** * {@inheritDoc} */ public Size apply(MethodVisitor methodVisitor, Context implementationContext, MethodDescription instrumentedMethod) { FieldDescription valuesField = instrumentedType.getDeclaredFields().filter(named(ENUM_VALUES)).getOnly(); MethodDescription cloneMethod = TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class).getDeclaredMethods().filter(named(CLONE_METHOD_NAME)).getOnly(); return new Size(new StackManipulation.Compound( FieldAccess.forField(valuesField).read(), MethodInvocation.invoke(cloneMethod).virtual(valuesField.getType().asErasure()), TypeCasting.to(valuesField.getType().asErasure()), MethodReturn.REFERENCE ).apply(methodVisitor, implementationContext).getMaximalSize(), instrumentedMethod.getStackSize()); } } /** * A byte code appender for the type initializer of any enumeration type. */ @HashCodeAndEqualsPlugin.Enhance protected static class InitializationAppender implements ByteCodeAppender { /** * The values of the enumeration that is being created. */ private final List values; /** * Creates an appender for an enumerations type initializer. * * @param values The values of the enumeration that is being created. */ protected InitializationAppender(List values) { this.values = values; } /** * {@inheritDoc} */ public Size apply(MethodVisitor methodVisitor, Context implementationContext, MethodDescription instrumentedMethod) { TypeDescription instrumentedType = instrumentedMethod.getDeclaringType().asErasure(); MethodDescription enumConstructor = instrumentedType.getDeclaredMethods() .filter(isConstructor().and(takesArguments(String.class, int.class))) .getOnly(); int ordinal = 0; StackManipulation stackManipulation = StackManipulation.Trivial.INSTANCE; List enumerationFields = new ArrayList(values.size()); for (String value : values) { FieldDescription fieldDescription = instrumentedType.getDeclaredFields().filter(named(value)).getOnly(); stackManipulation = new StackManipulation.Compound(stackManipulation, TypeCreation.of(instrumentedType), Duplication.SINGLE, new TextConstant(value), IntegerConstant.forValue(ordinal++), MethodInvocation.invoke(enumConstructor), FieldAccess.forField(fieldDescription).write()); enumerationFields.add(fieldDescription); } List fieldGetters = new ArrayList(values.size()); for (FieldDescription fieldDescription : enumerationFields) { fieldGetters.add(FieldAccess.forField(fieldDescription).read()); } stackManipulation = new StackManipulation.Compound( stackManipulation, ArrayFactory.forType(instrumentedType.asGenericType()).withValues(fieldGetters), FieldAccess.forField(instrumentedType.getDeclaredFields().filter(named(ENUM_VALUES)).getOnly()).write() ); return new Size(stackManipulation.apply(methodVisitor, implementationContext).getMaximalSize(), instrumentedMethod.getStackSize()); } } } /** * A constructor strategy for implementing a Java record. */ @HashCodeAndEqualsPlugin.Enhance protected enum RecordConstructorStrategy implements ConstructorStrategy, Implementation { /** * The singleton instance. */ INSTANCE; /** * {@inheritDoc} */ public List extractConstructors(TypeDescription instrumentedType) { List tokens = new ArrayList(instrumentedType.getRecordComponents().size()); for (RecordComponentDescription.InDefinedShape recordComponent : instrumentedType.getRecordComponents()) { tokens.add(new ParameterDescription.Token(recordComponent.getType(), recordComponent.getDeclaredAnnotations().filter(targetsElement(ElementType.CONSTRUCTOR)), recordComponent.getActualName(), ModifierContributor.EMPTY_MASK)); } return Collections.singletonList(new MethodDescription.Token(MethodDescription.CONSTRUCTOR_INTERNAL_NAME, Opcodes.ACC_PUBLIC, Collections.emptyList(), TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(void.class), tokens, Collections.emptyList(), Collections.emptyList(), AnnotationValue.UNDEFINED, TypeDescription.Generic.UNDEFINED)); } /** * {@inheritDoc} */ public MethodRegistry inject(TypeDescription instrumentedType, MethodRegistry methodRegistry) { return methodRegistry.prepend(new LatentMatcher.Resolved(isConstructor().and(takesGenericArguments(instrumentedType.getRecordComponents().asTypeList()))), new MethodRegistry.Handler.ForImplementation(this), MethodAttributeAppender.ForInstrumentedMethod.EXCLUDING_RECEIVER, Transformer.ForMethod.NoOp.make()); } /** * {@inheritDoc} */ public ByteCodeAppender appender(Target implementationTarget) { return new Appender(implementationTarget.getInstrumentedType()); } /** * {@inheritDoc} */ public InstrumentedType prepare(InstrumentedType instrumentedType) { for (RecordComponentDescription.InDefinedShape recordComponent : instrumentedType.getRecordComponents()) { instrumentedType = instrumentedType .withField(new FieldDescription.Token(recordComponent.getActualName(), Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL, recordComponent.getType(), recordComponent.getDeclaredAnnotations().filter(targetsElement(ElementType.FIELD)))) .withMethod(new MethodDescription.Token(recordComponent.getActualName(), Opcodes.ACC_PUBLIC, Collections.emptyList(), recordComponent.getType(), Collections.emptyList(), Collections.emptyList(), recordComponent.getDeclaredAnnotations().filter(targetsElement(ElementType.METHOD)), AnnotationValue.UNDEFINED, TypeDescription.Generic.UNDEFINED)); } return instrumentedType; } /** * A byte code appender for accessors and the record constructor. */ @HashCodeAndEqualsPlugin.Enhance protected static class Appender implements ByteCodeAppender { /** * The instrumented type. */ private final TypeDescription instrumentedType; /** * Creates a new byte code appender for accessors and the record constructor. * * @param instrumentedType The instrumented type. */ protected Appender(TypeDescription instrumentedType) { this.instrumentedType = instrumentedType; } /** * {@inheritDoc} */ public Size apply(MethodVisitor methodVisitor, Context implementationContext, MethodDescription instrumentedMethod) { if (instrumentedMethod.isMethod()) { return new Simple( MethodVariableAccess.loadThis(), FieldAccess.forField(instrumentedType.getDeclaredFields().filter(named(instrumentedMethod.getName())).getOnly()).read(), MethodReturn.of(instrumentedMethod.getReturnType()) ).apply(methodVisitor, implementationContext, instrumentedMethod); } else { List stackManipulations = new ArrayList(instrumentedType.getRecordComponents().size() * 3 + 2); stackManipulations.add(MethodVariableAccess.loadThis()); stackManipulations.add(MethodInvocation.invoke(new MethodDescription.Latent(JavaType.RECORD.getTypeStub(), new MethodDescription.Token(Opcodes.ACC_PUBLIC)))); int offset = 1; for (RecordComponentDescription.InDefinedShape recordComponent : instrumentedType.getRecordComponents()) { stackManipulations.add(MethodVariableAccess.loadThis()); stackManipulations.add(MethodVariableAccess.of(recordComponent.getType()).loadFrom(offset)); stackManipulations.add(FieldAccess.forField(instrumentedType.getDeclaredFields() .filter(named(recordComponent.getActualName())) .getOnly()).write()); offset += recordComponent.getType().getStackSize().getSize(); } stackManipulations.add(MethodReturn.VOID); return new Simple(stackManipulations).apply(methodVisitor, implementationContext, instrumentedMethod); } } } } /** * Implements the object methods of the Java record type. */ @HashCodeAndEqualsPlugin.Enhance protected enum RecordObjectMethod implements Implementation { /** * The {@code hashCode} method. */ HASH_CODE("hashCode", StackManipulation.Trivial.INSTANCE, int.class), /** * The {@code equals} method. */ EQUALS("equals", MethodVariableAccess.REFERENCE.loadFrom(1), boolean.class, Object.class), /** * The {@code toString} method. */ TO_STRING("toString", StackManipulation.Trivial.INSTANCE, String.class); /** * The method name. */ private final String name; /** * The stack manipulation to append to the arguments. */ private final StackManipulation stackManipulation; /** * The return type. */ private final TypeDescription returnType; /** * The arguments type. */ private final List arguments; /** * Creates a new object method instance for a Java record. * * @param name The method name. * @param stackManipulation The stack manipulation to append to the arguments. * @param returnType The return type. * @param arguments The arguments type. */ RecordObjectMethod(String name, StackManipulation stackManipulation, Class returnType, Class... arguments) { this.name = name; this.stackManipulation = stackManipulation; this.returnType = TypeDescription.ForLoadedType.of(returnType); this.arguments = new TypeList.ForLoadedTypes(arguments); } /** * {@inheritDoc} */ public ByteCodeAppender appender(Target implementationTarget) { StringBuilder stringBuilder = new StringBuilder(); List methodHandles = new ArrayList(implementationTarget.getInstrumentedType().getRecordComponents().size()); for (RecordComponentDescription.InDefinedShape recordComponent : implementationTarget.getInstrumentedType().getRecordComponents()) { if (stringBuilder.length() > 0) { stringBuilder.append(";"); } stringBuilder.append(recordComponent.getActualName()); methodHandles.add(JavaConstant.MethodHandle.ofGetter(implementationTarget.getInstrumentedType().getDeclaredFields() .filter(named(recordComponent.getActualName())) .getOnly())); } return new ByteCodeAppender.Simple(MethodVariableAccess.loadThis(), stackManipulation, MethodInvocation.invoke(new MethodDescription.Latent(JavaType.OBJECT_METHODS.getTypeStub(), new MethodDescription.Token("bootstrap", Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(Object.class), Arrays.asList(JavaType.METHOD_HANDLES_LOOKUP.getTypeStub().asGenericType(), TypeDescription.ForLoadedType.of(String.class).asGenericType(), JavaType.TYPE_DESCRIPTOR.getTypeStub().asGenericType(), TypeDescription.ForLoadedType.of(Class.class).asGenericType(), TypeDescription.ForLoadedType.of(String.class).asGenericType(), TypeDescription.ArrayProjection.of(JavaType.METHOD_HANDLE.getTypeStub()).asGenericType())))).dynamic(name, returnType, CompoundList.of(implementationTarget.getInstrumentedType(), arguments), CompoundList.of(Arrays.asList(JavaConstant.Simple.of(implementationTarget.getInstrumentedType()), JavaConstant.Simple.ofLoaded(stringBuilder.toString())), methodHandles)), MethodReturn.of(returnType)); } /** * {@inheritDoc} */ public InstrumentedType prepare(InstrumentedType instrumentedType) { return instrumentedType; } } }