com.ui4j.bytebuddy.NamingStrategy Maven / Gradle / Ivy
package com.ui4j.bytebuddy;
import com.ui4j.bytebuddy.instrumentation.ModifierContributor;
import com.ui4j.bytebuddy.instrumentation.type.TypeDescription;
import com.ui4j.bytebuddy.modifier.EnumerationState;
import com.ui4j.bytebuddy.modifier.SyntheticState;
import com.ui4j.bytebuddy.modifier.TypeManifestation;
import com.ui4j.bytebuddy.modifier.Visibility;
import com.ui4j.bytebuddy.utility.ByteBuddyCommons;
import com.ui4j.bytebuddy.utility.RandomString;
import com.ui4j.bytebuddy.jar.asm.Opcodes;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.List;
/**
* A naming strategy for finding a fully qualified name for a Java type.
*
* Note that subclasses that lie within the same package as their superclass have improved access to overriding
* package-private methods of their super type.
*/
public interface NamingStrategy {
/**
* Generates a fully qualified name for a Java type. The resulting should not lie within the {@code java.lang}
* package since such types cannot be loaded using a normal class loader. Also, the name should not yet be taken
* by another type since this would cause conflicts in the name space. Therefore, it is recommendable to include
* a random sequence within the name.
*
* @param unnamedType An unnamed type that is to be named.
* @return A valid identifier for a Java type.
*/
String name(UnnamedType unnamedType);
/**
* An description of a type which is to be named.
*/
static interface UnnamedType {
/**
* Returns this unnamed type's super class.
*
* @return A description of the super class of the type to be named.
*/
TypeDescription getSuperClass();
/**
* Returns a collection of descriptions of this unnamed type's directly implemented interfaces.
*
* @return A collection of implemented interfaces.
*/
Collection getDeclaredInterfaces();
/**
* Returns the visibility of this unnamed type.
*
* @return The visibility of this unnamed type.
*/
Visibility getVisibility();
/**
* Returns the manifestation of this unnamed type.
*
* @return The manifestation of this unnamed type.
*/
TypeManifestation getTypeManifestation();
/**
* Returns the manifestation of this unnamed type.
*
* @return The manifestation of this unnamed type.
*/
SyntheticState getSyntheticState();
/**
* Returns the enumeration state of this unnamed type.
*
* @return The enumeration state of this unnamed type.
*/
EnumerationState getEnumerationState();
/**
* Returns the class file version of this unnamed type.
*
* @return The class file version of this unnamed type.
*/
ClassFileVersion getClassFileVersion();
/**
* An unnamed type which is to be named by a naming strategy.
*/
static class Default implements UnnamedType {
/**
* The unnamed type's super class.
*/
private final TypeDescription superClass;
/**
* The unnamed type's interfaces.
*/
private final List interfaces;
/**
* The unnamed type's modifiers.
*/
private final int modifiers;
/**
* The class file version of the unnamed type.
*/
private final ClassFileVersion classFileVersion;
/**
* Creates a new unnamed type.
*
* @param superClass The unnamed type's super class.
* @param interfaces The unnamed type's interfaces.
* @param modifiers The unnamed type's modifiers.
* @param classFileVersion The class file version of the unnamed type.
*/
public Default(TypeDescription superClass,
List interfaces,
int modifiers,
ClassFileVersion classFileVersion) {
this.superClass = superClass;
this.interfaces = interfaces;
this.modifiers = modifiers;
this.classFileVersion = classFileVersion;
}
@Override
public TypeDescription getSuperClass() {
return superClass;
}
@Override
public List getDeclaredInterfaces() {
return interfaces;
}
@Override
public Visibility getVisibility() {
switch (modifiers & ByteBuddyCommons.VISIBILITY_MODIFIER_MASK) {
case Opcodes.ACC_PUBLIC:
return Visibility.PUBLIC;
case Opcodes.ACC_PROTECTED:
return Visibility.PROTECTED;
case Opcodes.ACC_PRIVATE:
return Visibility.PRIVATE;
case ModifierContributor.EMPTY_MASK:
return Visibility.PACKAGE_PRIVATE;
default:
throw new IllegalStateException("Ambiguous modifier: " + modifiers);
}
}
@Override
public TypeManifestation getTypeManifestation() {
if ((modifiers & Modifier.FINAL) != 0) {
return TypeManifestation.FINAL;
// Note: Interfaces are abstract, the interface condition needs to be checked before abstraction.
} else if ((modifiers & Opcodes.ACC_INTERFACE) != 0) {
return TypeManifestation.INTERFACE;
} else if ((modifiers & Opcodes.ACC_ABSTRACT) != 0) {
return TypeManifestation.ABSTRACT;
} else {
return TypeManifestation.PLAIN;
}
}
@Override
public EnumerationState getEnumerationState() {
return EnumerationState.is((modifiers & Opcodes.ACC_ENUM) != 0);
}
@Override
public SyntheticState getSyntheticState() {
return SyntheticState.is((modifiers & Opcodes.ACC_SYNTHETIC) != 0);
}
@Override
public ClassFileVersion getClassFileVersion() {
return classFileVersion;
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
Default aDefault = (Default) other;
return modifiers == aDefault.modifiers
&& classFileVersion.equals(aDefault.classFileVersion)
&& interfaces.equals(aDefault.interfaces)
&& superClass.equals(aDefault.superClass);
}
@Override
public int hashCode() {
int result = superClass.hashCode();
result = 31 * result + interfaces.hashCode();
result = 31 * result + modifiers;
result = 31 * result + classFileVersion.hashCode();
return result;
}
@Override
public String toString() {
return "NamingStrategy.UnnamedType.Default{" +
"superClass=" + superClass +
", interfaces=" + interfaces +
", modifiers=" + modifiers +
", classFileVersion=" + classFileVersion +
'}';
}
}
}
/**
* An unbound {@link com.ui4j.bytebuddy.NamingStrategy} where the actual naming strategy is still to be determined
* in dependency of whether a type is to be subclasses, redefined or rebased.
*/
static interface Unbound {
/**
* Returns a naming strategy for subclassing a type.
*
* @param typeDescription The type that the user specified to be subclasses.
* @return A naming strategy for naming the generated subclass.
*/
NamingStrategy subclass(TypeDescription typeDescription);
/**
* Returns a naming strategy for redefining a type.
*
* @param typeDescription The type that the user specified to be subclasses.
* @return A naming strategy for naming the redefined class.
*/
NamingStrategy redefine(TypeDescription typeDescription);
/**
* Returns a naming strategy for rebasing a type.
*
* @param typeDescription The type that the user specified to be subclasses.
* @return A naming strategy for naming the rebased class.
*/
NamingStrategy rebase(TypeDescription typeDescription);
/**
* A default unbound {@link com.ui4j.bytebuddy.NamingStrategy} where rebased or redefined classes keep
* their original name and where subclasses are named using a {@link com.ui4j.bytebuddy.NamingStrategy.SuffixingRandom}
* strategy.
*/
static class Default implements Unbound {
/**
* The suffix to apply for generated subclasses.
*/
private final String suffix;
/**
* Creates a default unbound naming strategy.
*
* @param suffix The suffix to apply for generated subclasses
*/
public Default(String suffix) {
this.suffix = suffix;
}
@Override
public NamingStrategy subclass(TypeDescription typeDescription) {
return new SuffixingRandom(suffix, new SuffixingRandom.BaseNameResolver.ForGivenType(typeDescription));
}
@Override
public NamingStrategy redefine(TypeDescription typeDescription) {
return new Fixed(typeDescription.getName());
}
@Override
public NamingStrategy rebase(TypeDescription typeDescription) {
return new Fixed(typeDescription.getName());
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& suffix.equals(((Default) other).suffix);
}
@Override
public int hashCode() {
return suffix.hashCode();
}
@Override
public String toString() {
return "NamingStrategy.Unbound.Default{" +
"suffix='" + suffix + '\'' +
'}';
}
}
/**
* A unified unbound naming strategy which always applies a given naming strategy.
*/
static class Unified implements Unbound {
/**
* The unified naming strategy.
*/
private final NamingStrategy namingStrategy;
/**
* Creates a new unified naming strategy.
*
* @param namingStrategy The unified naming strategy.
*/
public Unified(NamingStrategy namingStrategy) {
this.namingStrategy = namingStrategy;
}
@Override
public NamingStrategy subclass(TypeDescription typeDescription) {
return namingStrategy;
}
@Override
public NamingStrategy redefine(TypeDescription typeDescription) {
return namingStrategy;
}
@Override
public NamingStrategy rebase(TypeDescription typeDescription) {
return namingStrategy;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& namingStrategy.equals(((Unified) other).namingStrategy);
}
@Override
public int hashCode() {
return namingStrategy.hashCode();
}
@Override
public String toString() {
return "NamingStrategy.Unbound.Unified{" +
"namingStrategy=" + namingStrategy +
'}';
}
}
}
/**
* 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.
*/
static class SuffixingRandom implements NamingStrategy {
/**
* The default package for defining types that are renamed to not be contained in the
* {@link com.ui4j.bytebuddy.NamingStrategy.SuffixingRandom#JAVA_PACKAGE} package.
*/
public static final String BYTE_BUDDY_RENAME_PACKAGE = "com.ui4j.bytebuddy.renamed";
/**
* 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 com.ui4j.bytebuddy.NamingStrategy.SuffixingRandom#JAVA_PACKAGE}.
*/
private final String javaLangPackagePrefix;
/**
* An instance for creating random seed values.
*/
private final RandomString randomString;
/**
* 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 SuffixingRandom(String suffix) {
this(suffix, BaseNameResolver.ForUnnamedType.INSTANCE, 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 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, 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.lang} namespace.
*/
public SuffixingRandom(String suffix, BaseNameResolver baseNameResolver, String javaLangPackagePrefix) {
this.suffix = suffix;
this.baseNameResolver = baseNameResolver;
this.javaLangPackagePrefix = javaLangPackagePrefix;
randomString = new RandomString();
}
@Override
public String name(UnnamedType unnamedType) {
String baseName = baseNameResolver.resolve(unnamedType);
if (baseName.startsWith(JAVA_PACKAGE)) {
baseName = javaLangPackagePrefix + "." + baseName;
}
return String.format("%s$%s$%s", baseName, suffix, randomString.nextString());
}
@Override
public boolean equals(Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
SuffixingRandom that = (SuffixingRandom) other;
return javaLangPackagePrefix.equals(that.javaLangPackagePrefix)
&& suffix.equals(that.suffix)
&& baseNameResolver.equals(that.baseNameResolver);
}
@Override
public int hashCode() {
int result = suffix.hashCode();
result = 31 * result + javaLangPackagePrefix.hashCode();
result = 31 * result + baseNameResolver.hashCode();
return result;
}
@Override
public String toString() {
return "NamingStrategy.SuffixingRandom{" +
"suffix='" + suffix + '\'' +
", javaLangPackagePrefix='" + javaLangPackagePrefix + '\'' +
", baseNameResolver=" + baseNameResolver +
", randomString=" + randomString +
'}';
}
/**
* A base name resolver is responsible for resolving a name onto which the suffix is appended.
*/
public static interface BaseNameResolver {
/**
* Returns the resolved name.
*
* @param unnamedType The unnamed type which is to be named.
* @return The resolved name.
*/
String resolve(UnnamedType unnamedType);
/**
* Uses the unnamed type's super type's name as the resolved name.
*/
static enum ForUnnamedType implements BaseNameResolver {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public String resolve(UnnamedType unnamedType) {
return unnamedType.getSuperClass().getName();
}
}
/**
* Uses a specific type's name as the resolved name.
*/
static 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;
}
@Override
public String resolve(UnnamedType unnamedType) {
return typeDescription.getName();
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& typeDescription.equals(((ForGivenType) other).typeDescription);
}
@Override
public int hashCode() {
return typeDescription.hashCode();
}
@Override
public String toString() {
return "NamingStrategy.SuffixingRandom.BaseNameResolver.ForGivenType{" +
"typeDescription=" + typeDescription +
'}';
}
}
}
}
/**
* 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.
*/
static class PrefixingRandom implements NamingStrategy {
/**
* The package to prefix.
*/
private final String prefix;
/**
* A seed generator.
*/
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
public String name(UnnamedType unnamedType) {
return String.format("%s.%s$%s", prefix, unnamedType.getSuperClass().getName(), randomString.nextString());
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& prefix.equals(((PrefixingRandom) other).prefix);
}
@Override
public int hashCode() {
return prefix.hashCode();
}
@Override
public String toString() {
return "NamingStrategy.PrefixingRandom{" +
"prefix='" + prefix + '\'' +
", randomString=" + randomString +
'}';
}
}
/**
* A naming strategy that applies a fixed name.
*
* This strategy should only be used for one shot type generators since they will otherwise create types that
* impose naming conflicts.
*/
static class Fixed implements NamingStrategy {
/**
* The fixed type name.
*/
private final String name;
/**
* Creates an immutable fixed naming strategy.
*
* @param name The name for the created type.
*/
public Fixed(String name) {
this.name = name;
}
@Override
public String name(UnnamedType unnamedType) {
return name;
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& name.equals(((Fixed) other).name);
}
@Override
public int hashCode() {
return name.hashCode();
}
@Override
public String toString() {
return "NamingStrategy.Fixed{name='" + name + '\'' + '}';
}
}
}
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