net.bytebuddy.NamingStrategy Maven / Gradle / Ivy
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Byte Buddy is a Java library for creating Java classes at run time.
This artifact is a build of Byte Buddy with a remaining dependency onto ASM.
You should never depend on this module without repackaging Byte Buddy and ASM into your own namespace.
/*
* 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.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.utility.RandomString;
/**
*
* A naming strategy for determining a fully qualified name for a dynamically created Java type.
*
*
* Note that subclasses that lie within the same package as their superclass can access package-private methods
* of super types within the same package.
*
*/
public interface NamingStrategy {
/**
* The default package for defining types that are renamed to not be contained in the {@code java} package.
*/
String BYTE_BUDDY_RENAME_PACKAGE = "net.bytebuddy.renamed";
/**
* Indicates that types of the {@code java.*} package should not be prefixed.
*/
String NO_PREFIX = "";
/**
* Determines a new name when creating a new type that subclasses the provided type.
*
* @param superClass The super type of the created type.
* @return The name of the dynamic type.
*/
String subclass(TypeDescription.Generic superClass);
/**
* Determines a name for the dynamic type when redefining the provided type.
*
* @param typeDescription The type being redefined.
* @return The name of the dynamic type.
*/
String redefine(TypeDescription typeDescription);
/**
* Determines a name for the dynamic type when rebasing the provided type.
*
* @param typeDescription The type being redefined.
* @return The name of the dynamic type.
*/
String rebase(TypeDescription typeDescription);
/**
* An abstract base implementation where the names of redefined and rebased types are retained.
*/
abstract class AbstractBase implements NamingStrategy {
/**
* {@inheritDoc}
*/
public String subclass(TypeDescription.Generic superClass) {
return name(superClass.asErasure());
}
/**
* Determines a new name when creating a new type that subclasses the provided type.
*
* @param superClass The super type of the created type.
* @return The name of the dynamic type.
*/
protected abstract String name(TypeDescription superClass);
/**
* {@inheritDoc}
*/
public String redefine(TypeDescription typeDescription) {
return typeDescription.getName();
}
/**
* {@inheritDoc}
*/
public String rebase(TypeDescription typeDescription) {
return typeDescription.getName();
}
}
/**
* A naming strategy that appends a given suffix to a name, without a randomized element.
*/
@HashCodeAndEqualsPlugin.Enhance
class Suffixing extends AbstractBase {
/**
* The package prefix of the {@code java.*} packages for which the definition of
* non-bootstrap types is illegal.
*/
private static final String JAVA_PACKAGE = "java.";
/**
* The suffix to attach to a super type name.
*/
private final String suffix;
/**
* The renaming location for types of the {@link net.bytebuddy.NamingStrategy.SuffixingRandom#JAVA_PACKAGE}.
*/
private final String javaLangPackagePrefix;
/**
* A resolver for the base name for naming the unnamed type.
*/
private final BaseNameResolver baseNameResolver;
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace. All names are derived from the
* unnamed type's super type.
*
* @param suffix The suffix for the generated class.
*/
public Suffixing(String suffix) {
this(suffix, BaseNameResolver.ForUnnamedType.INSTANCE);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace.
*
* @param suffix The suffix for the generated class.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
*/
public Suffixing(String suffix, String javaLangPackagePrefix) {
this(suffix, BaseNameResolver.ForUnnamedType.INSTANCE, javaLangPackagePrefix);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
*/
public Suffixing(String suffix, BaseNameResolver baseNameResolver) {
this(suffix, baseNameResolver, BYTE_BUDDY_RENAME_PACKAGE);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into a given namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
*/
public Suffixing(String suffix, BaseNameResolver baseNameResolver, String javaLangPackagePrefix) {
this.suffix = suffix;
this.baseNameResolver = baseNameResolver;
this.javaLangPackagePrefix = javaLangPackagePrefix;
}
@Override
protected String name(TypeDescription superClass) {
String baseName = baseNameResolver.resolve(superClass);
if (baseName.startsWith(JAVA_PACKAGE) && !javaLangPackagePrefix.equals("")) {
baseName = javaLangPackagePrefix + "." + baseName;
}
return baseName + "$" + suffix;
}
/**
* A base name resolver is responsible for resolving a name onto which the suffix is appended.
*/
public interface BaseNameResolver {
/**
* Resolves the base name for a given type description.
*
* @param typeDescription The type for which the base name is resolved.
* @return The base name for the given type.
*/
String resolve(TypeDescription typeDescription);
/**
* Uses the unnamed type's super type's name as the resolved name.
*/
enum ForUnnamedType implements BaseNameResolver {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public String resolve(TypeDescription typeDescription) {
return typeDescription.getName();
}
}
/**
* Uses a specific type's name as the resolved name.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForGivenType implements BaseNameResolver {
/**
* The type description which represents the resolved name.
*/
private final TypeDescription typeDescription;
/**
* Creates a new base name resolver that resolves a using the name of a given type.
*
* @param typeDescription The type description which represents the resolved name.
*/
public ForGivenType(TypeDescription typeDescription) {
this.typeDescription = typeDescription;
}
/**
* {@inheritDoc}
*/
public String resolve(TypeDescription typeDescription) {
return this.typeDescription.getName();
}
}
/**
* A base name resolver that simply returns a fixed value.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForFixedValue implements BaseNameResolver {
/**
* The fixed base name.
*/
private final String name;
/**
* Creates a new base name resolver for a fixed name.
*
* @param name The fixed name
*/
public ForFixedValue(String name) {
this.name = name;
}
/**
* {@inheritDoc}
*/
public String resolve(TypeDescription typeDescription) {
return name;
}
}
/**
* A base name resolver that adds the name of the class that is invoking {@link ByteBuddy}. This
* base name resolver can therefore not be invoked directly.
*/
@HashCodeAndEqualsPlugin.Enhance
class WithCallerSuffix implements BaseNameResolver {
/**
* The base name resolver that is resolving the base name.
*/
private final BaseNameResolver delegate;
/**
* Creates a new base name resolver that appends a caller suffix.
*
* @param delegate The base name resolver that is resolving the base name.
*/
public WithCallerSuffix(BaseNameResolver delegate) {
this.delegate = delegate;
}
/**
* {@inheritDoc}
*/
public String resolve(TypeDescription typeDescription) {
boolean matched = false;
String caller = null;
for (StackTraceElement stackTraceElement : new Throwable().getStackTrace()) {
if (stackTraceElement.getClassName().equals(ByteBuddy.class.getName())) {
matched = true;
} else if (matched) {
caller = stackTraceElement.getClassName() + "." + stackTraceElement.getMethodName();
break;
}
}
if (caller == null) {
throw new IllegalStateException("Base name resolver not invoked via " + ByteBuddy.class);
}
return delegate.resolve(typeDescription) + "$" + caller.replace('.', '$');
}
}
}
}
/**
* A naming strategy that creates a name by concatenating:
*
* - The super classes package and name
* - A given suffix string
* - A random number
*
* Between all these elements, a {@code $} sign is included into the name to improve readability. As an exception,
* types that subclass classes from the {@code java.**} packages are prefixed with a given package. This is
* necessary as it is illegal to define non-bootstrap classes in this name space. The same strategy is applied
* when subclassing a signed type which is equally illegal.
*/
@HashCodeAndEqualsPlugin.Enhance
class SuffixingRandom extends Suffixing {
/**
* An instance for creating random seed values.
*/
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.IGNORE)
private final RandomString randomString;
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace. All names are derived from the
* unnamed type's super type.
*
* @param suffix The suffix for the generated class.
*/
public SuffixingRandom(String suffix) {
this(suffix, Suffixing.BaseNameResolver.ForUnnamedType.INSTANCE);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace.
*
* @param suffix The suffix for the generated class.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
*/
public SuffixingRandom(String suffix, String javaLangPackagePrefix) {
this(suffix, Suffixing.BaseNameResolver.ForUnnamedType.INSTANCE, javaLangPackagePrefix);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
* @deprecated Use {@link NamingStrategy.SuffixingRandom#SuffixingRandom(String, NamingStrategy.Suffixing.BaseNameResolver)}.
*/
@Deprecated
public SuffixingRandom(String suffix, BaseNameResolver baseNameResolver) {
this(suffix, (Suffixing.BaseNameResolver) baseNameResolver);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into Byte Buddy's package namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
*/
public SuffixingRandom(String suffix, Suffixing.BaseNameResolver baseNameResolver) {
this(suffix, baseNameResolver, BYTE_BUDDY_RENAME_PACKAGE);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into a given namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
* @deprecated Use {@link NamingStrategy.SuffixingRandom#SuffixingRandom(String, NamingStrategy.Suffixing.BaseNameResolver, String)}.
*/
@Deprecated
public SuffixingRandom(String suffix, BaseNameResolver baseNameResolver, String javaLangPackagePrefix) {
this(suffix, (Suffixing.BaseNameResolver) baseNameResolver, javaLangPackagePrefix);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into a given namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
*/
public SuffixingRandom(String suffix, Suffixing.BaseNameResolver baseNameResolver, String javaLangPackagePrefix) {
this(suffix, baseNameResolver, javaLangPackagePrefix, new RandomString());
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into a given namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
* @param randomString The random string instance to use.
* @deprecated Use {@link NamingStrategy.SuffixingRandom#SuffixingRandom(String, NamingStrategy.Suffixing.BaseNameResolver, String, RandomString)}.
*/
@Deprecated
public SuffixingRandom(String suffix, BaseNameResolver baseNameResolver, String javaLangPackagePrefix, RandomString randomString) {
this(suffix, (Suffixing.BaseNameResolver) baseNameResolver, javaLangPackagePrefix, randomString);
}
/**
* Creates an immutable naming strategy with a given suffix but moves types that subclass types within
* the {@code java.lang} package into a given namespace.
*
* @param suffix The suffix for the generated class.
* @param baseNameResolver The base name resolver that is queried for locating the base name.
* @param javaLangPackagePrefix The fallback namespace for type's that subclass types within the
* {@code java.*} namespace. If The prefix is set to the empty string,
* no prefix is added.
* @param randomString The random string instance to use.
*/
public SuffixingRandom(String suffix, Suffixing.BaseNameResolver baseNameResolver, String javaLangPackagePrefix, RandomString randomString) {
super(suffix, baseNameResolver, javaLangPackagePrefix);
this.randomString = randomString;
}
@Override
protected String name(TypeDescription superClass) {
return super.name(superClass) + "$" + randomString.nextString();
}
/**
* A base name resolver is responsible for resolving a name onto which the suffix is appended.
*
* @deprecated Use {@link Suffixing.BaseNameResolver}.
*/
@Deprecated
public interface BaseNameResolver extends Suffixing.BaseNameResolver {
/**
* Uses the unnamed type's super type's name as the resolved name.
*
* @deprecated Use {@link Suffixing.BaseNameResolver.ForUnnamedType}.
*/
@Deprecated
enum ForUnnamedType implements BaseNameResolver {
/**
* The singleton instance.
*/
INSTANCE;
/**
* {@inheritDoc}
*/
public String resolve(TypeDescription typeDescription) {
return typeDescription.getName();
}
}
/**
* Uses a specific type's name as the resolved name.
*
* @deprecated Use {@link Suffixing.BaseNameResolver.ForGivenType}.
*/
@Deprecated
@HashCodeAndEqualsPlugin.Enhance
class ForGivenType extends Suffixing.BaseNameResolver.ForGivenType implements BaseNameResolver {
/**
* Creates a new base name resolver that resolves a using the name of a given type.
*
* @param typeDescription The type description which represents the resolved name.
*/
public ForGivenType(TypeDescription typeDescription) {
super(typeDescription);
}
}
/**
* A base name resolver that simply returns a fixed value.
*
* @deprecated Use {@link Suffixing.BaseNameResolver.ForFixedValue}.
*/
@Deprecated
@HashCodeAndEqualsPlugin.Enhance
class ForFixedValue extends Suffixing.BaseNameResolver.ForFixedValue implements BaseNameResolver {
/**
* Creates a new base name resolver for a fixed name.
*
* @param name The fixed name
*/
public ForFixedValue(String name) {
super(name);
}
}
}
}
/**
* A naming strategy that creates a name by prefixing a given class and its package with another package and
* by appending a random number to the class's simple name.
*/
@HashCodeAndEqualsPlugin.Enhance
class PrefixingRandom extends AbstractBase {
/**
* The package to prefix.
*/
private final String prefix;
/**
* A seed generator.
*/
@HashCodeAndEqualsPlugin.ValueHandling(HashCodeAndEqualsPlugin.ValueHandling.Sort.IGNORE)
private final RandomString randomString;
/**
* Creates a new prefixing random naming strategy.
*
* @param prefix The prefix to append.
*/
public PrefixingRandom(String prefix) {
this.prefix = prefix;
randomString = new RandomString();
}
@Override
protected String name(TypeDescription superClass) {
return prefix + "." + superClass.getName() + "$" + randomString.nextString();
}
}
}
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