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package com.fitbur.bytebuddy.description.method;
import com.fitbur.bytebuddy.description.ByteCodeElement;
import com.fitbur.bytebuddy.description.type.TypeDefinition;
import com.fitbur.bytebuddy.description.type.TypeDescription;
import com.fitbur.bytebuddy.description.type.TypeList;
import com.fitbur.bytebuddy.matcher.ElementMatcher;
import com.fitbur.bytebuddy.matcher.FilterableList;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Represents a list of parameters of a method or a constructor.
*
* @param The type of parameter descriptions represented by this list.
*/
public interface ParameterList extends FilterableList> {
/**
* Transforms this list of parameters into a list of the types of the represented parameters.
*
* @return A list of types representing the parameters of this list.
*/
TypeList.Generic asTypeList();
/**
* Transforms the list of parameter descriptions into a list of detached tokens. All types that are matched by the provided
* target type matcher are substituted by {@link com.fitbur.bytebuddy.dynamic.TargetType}.
*
* @param matcher A matcher that indicates type substitution.
* @return The transformed token list.
*/
ByteCodeElement.Token.TokenList asTokenList(ElementMatcher matcher);
/**
* Returns this list of these parameter descriptions resolved to their defined shape.
*
* @return A list of parameters in their defined shape.
*/
ParameterList asDefined();
/**
* Checks if all parameters in this list define both an explicit name and an explicit modifier.
*
* @return {@code true} if all parameters in this list define both an explicit name and an explicit modifier.
*/
boolean hasExplicitMetaData();
/**
* An base implementation for a {@link ParameterList}.
*
* @param The type of parameter descriptions represented by this list.
*/
abstract class AbstractBase extends FilterableList.AbstractBase> implements ParameterList {
@Override
public boolean hasExplicitMetaData() {
for (ParameterDescription parameterDescription : this) {
if (!parameterDescription.isNamed() || !parameterDescription.hasModifiers()) {
return false;
}
}
return true;
}
@Override
public ByteCodeElement.Token.TokenList asTokenList(ElementMatcher matcher) {
List tokens = new ArrayList(size());
for (ParameterDescription parameterDescription : this) {
tokens.add(parameterDescription.asToken(matcher));
}
return new ByteCodeElement.Token.TokenList(tokens);
}
@Override
public TypeList.Generic asTypeList() {
List types = new ArrayList(size());
for (ParameterDescription parameterDescription : this) {
types.add(parameterDescription.getType());
}
return new TypeList.Generic.Explicit(types);
}
@Override
public ParameterList asDefined() {
List declaredForms = new ArrayList(size());
for (ParameterDescription parameterDescription : this) {
declaredForms.add(parameterDescription.asDefined());
}
return new Explicit(declaredForms);
}
@Override
protected ParameterList wrap(List values) {
return new Explicit(values);
}
}
/**
* Represents a list of parameters for an executable, i.e. a {@link java.lang.reflect.Method} or {@link java.lang.reflect.Constructor}.
*
* @param The type of the {@code java.lang.reflect.Executable} that this list represents.
*/
abstract class ForLoadedExecutable extends AbstractBase {
/**
* The dispatcher used creating parameter list instances and for accessing {@code java.lang.reflect.Executable} instances.
*/
private static final Dispatcher DISPATCHER;
/*
* Creates a dispatcher for a loaded parameter if the type is available for the running JVM.
*/
static {
Dispatcher dispatcher;
try {
dispatcher = new Dispatcher.ForJava8CapableVm(Class.forName("java.lang.reflect.Executable").getDeclaredMethod("getParameterCount"));
} catch (RuntimeException exception) {
throw exception;
} catch (Exception ignored) {
dispatcher = Dispatcher.ForLegacyVm.INSTANCE;
}
DISPATCHER = dispatcher;
}
/**
* The executable for which a parameter list is represented.
*/
protected final T executable;
/**
* Creates a new description for a loaded executable.
*
* @param executable The executable for which a parameter list is represented.
*/
protected ForLoadedExecutable(T executable) {
this.executable = executable;
}
/**
* Creates a new list that describes the parameters of the given {@link Constructor}.
*
* @param constructor The constructor for which the parameters should be described.
* @return A list describing the constructor's parameters.
*/
public static ParameterList of(Constructor constructor) {
return DISPATCHER.describe(constructor);
}
/**
* Creates a new list that describes the parameters of the given {@link Method}.
*
* @param method The method for which the parameters should be described.
* @return A list describing the method's parameters.
*/
public static ParameterList of(Method method) {
return DISPATCHER.describe(method);
}
@Override
public int size() {
return DISPATCHER.getParameterCount(executable);
}
/**
* A dispatcher for creating descriptions of parameter lists and for evaluating the size of an {@code java.lang.reflect.Executable}'s parameters.
*/
protected interface Dispatcher {
/**
* Returns the amount of parameters of a given executable..
*
* @param executable The executable for which the amount of parameters should be found.
* @return The amount of parameters of the given executable.
*/
int getParameterCount(Object executable);
/**
* Describes a {@link Constructor}'s parameters of the given VM.
*
* @param constructor The constructor for which the parameters should be described.
* @return A list describing the constructor's parameters.
*/
ParameterList describe(Constructor constructor);
/**
* Describes a {@link Method}'s parameters of the given VM.
*
* @param method The method for which the parameters should be described.
* @return A list describing the method's parameters.
*/
ParameterList describe(Method method);
/**
* A dispatcher for a legacy VM that does not support the {@code java.lang.reflect.Parameter} type.
*/
enum ForLegacyVm implements Dispatcher {
/**
* The singleton instance.
*/
INSTANCE;
@Override
public int getParameterCount(Object executable) {
throw new IllegalStateException("Cannot dispatch method for java.lang.reflect.Executable");
}
@Override
public ParameterList describe(Constructor constructor) {
return new OfLegacyVmConstructor(constructor);
}
@Override
public ParameterList describe(Method method) {
return new OfLegacyVmMethod(method);
}
@Override
public String toString() {
return "ParameterList.ForLoadedExecutable.Dispatcher.ForLegacyVm." + name();
}
}
/**
* A dispatcher for a legacy VM that does support the {@code java.lang.reflect.Parameter} type.
*/
class ForJava8CapableVm implements Dispatcher {
/**
* The {@code java.lang.reflect.Executable#getParameterCount()} method.
*/
private final Method getParameterCount;
/**
* Creates a new dispatcher for a modern VM.
*
* @param getParameterCount The {@code java.lang.reflect.Executable#getParameterCount()} method.
*/
protected ForJava8CapableVm(Method getParameterCount) {
this.getParameterCount = getParameterCount;
}
@Override
public int getParameterCount(Object executable) {
try {
return (Integer) getParameterCount.invoke(executable);
} catch (IllegalAccessException exception) {
throw new IllegalStateException("Cannot access java.lang.reflect.Parameter#getModifiers", exception);
} catch (InvocationTargetException exception) {
throw new IllegalStateException("Error invoking java.lang.reflect.Parameter#getModifiers", exception.getCause());
}
}
@Override
public ParameterList describe(Constructor constructor) {
return new OfConstructor(constructor);
}
@Override
public ParameterList describe(Method method) {
return new OfMethod(method);
}
@Override
public boolean equals(Object other) {
return this == other || !(other == null || getClass() != other.getClass())
&& getParameterCount.equals(((ForJava8CapableVm) other).getParameterCount);
}
@Override
public int hashCode() {
return getParameterCount.hashCode();
}
@Override
public String toString() {
return "ParameterList.ForLoadedExecutable.Dispatcher.ForJava8CapableVm{" +
"getParameterCount=" + getParameterCount +
'}';
}
}
}
/**
* Describes the list of {@link Constructor} parameters on a modern VM.
*/
protected static class OfConstructor extends ForLoadedExecutable> {
/**
* Creates a new description of the parameters of a constructor.
*
* @param constructor The constructor that is represented by this instance.
*/
protected OfConstructor(Constructor constructor) {
super(constructor);
}
@Override
public ParameterDescription.InDefinedShape get(int index) {
return new ParameterDescription.ForLoadedParameter.OfConstructor(executable, index);
}
}
/**
* Describes the list of {@link Method} parameters on a modern VM.
*/
protected static class OfMethod extends ForLoadedExecutable {
/**
* Creates a new description of the parameters of a method.
*
* @param method The method that is represented by this instance.
*/
protected OfMethod(Method method) {
super(method);
}
@Override
public ParameterDescription.InDefinedShape get(int index) {
return new ParameterDescription.ForLoadedParameter.OfMethod(executable, index);
}
}
/**
* Represents a list of constructor parameters on virtual machines where the {@code java.lang.reflect.Parameter}
* type is not available.
*/
protected static class OfLegacyVmConstructor extends ParameterList.AbstractBase {
/**
* The represented constructor.
*/
private final Constructor constructor;
/**
* An array of this method's parameter types.
*/
private final Class[] parameterType;
/**
* An array of all parameter annotations of the represented method.
*/
private final Annotation[][] parameterAnnotation;
/**
* Creates a legacy representation of a constructor's parameters.
*
* @param constructor The constructor to represent.
*/
public OfLegacyVmConstructor(Constructor constructor) {
this.constructor = constructor;
this.parameterType = constructor.getParameterTypes();
this.parameterAnnotation = constructor.getParameterAnnotations();
}
@Override
public ParameterDescription.InDefinedShape get(int index) {
return new ParameterDescription.ForLoadedParameter.OfLegacyVmConstructor(constructor, index, parameterType, parameterAnnotation);
}
@Override
public int size() {
return parameterType.length;
}
}
/**
* Represents a list of method parameters on virtual machines where the {@code java.lang.reflect.Parameter}
* type is not available.
*/
protected static class OfLegacyVmMethod extends ParameterList.AbstractBase {
/**
* The represented method.
*/
private final Method method;
/**
* An array of this method's parameter types.
*/
private final Class[] parameterType;
/**
* An array of all parameter annotations of the represented method.
*/
private final Annotation[][] parameterAnnotation;
/**
* Creates a legacy representation of a method's parameters.
*
* @param method The method to represent.
*/
protected OfLegacyVmMethod(Method method) {
this.method = method;
this.parameterType = method.getParameterTypes();
this.parameterAnnotation = method.getParameterAnnotations();
}
@Override
public ParameterDescription.InDefinedShape get(int index) {
return new ParameterDescription.ForLoadedParameter.OfLegacyVmMethod(method, index, parameterType, parameterAnnotation);
}
@Override
public int size() {
return parameterType.length;
}
}
}
/**
* A list of explicitly provided parameter descriptions.
*
* @param The type of parameter descriptions represented by this list.
*/
class Explicit extends AbstractBase {
/**
* The list of parameter descriptions that are represented by this list.
*/
private final List parameterDescriptions;
/**
* Creates a new list of explicit parameter descriptions.
*
* @param parameterDescription The list of parameter descriptions that are represented by this list.
*/
@SuppressWarnings("unchecked")
public Explicit(S... parameterDescription) {
this(Arrays.asList(parameterDescription));
}
/**
* Creates a new list of explicit parameter descriptions.
*
* @param parameterDescriptions The list of parameter descriptions that are represented by this list.
*/
public Explicit(List parameterDescriptions) {
this.parameterDescriptions = parameterDescriptions;
}
@Override
public S get(int index) {
return parameterDescriptions.get(index);
}
@Override
public int size() {
return parameterDescriptions.size();
}
/**
* A parameter list representing parameters without meta data or annotations.
*/
public static class ForTypes extends ParameterList.AbstractBase {
/**
* The method description that declares the parameters.
*/
private final MethodDescription.InDefinedShape methodDescription;
/**
* A list of detached types representing the parameters.
*/
private final List typeDefinitions;
/**
* Creates a new parameter type list.
*
* @param methodDescription The method description that declares the parameters.
* @param typeDefinition A list of detached types representing the parameters.
*/
public ForTypes(MethodDescription.InDefinedShape methodDescription, TypeDefinition... typeDefinition) {
this(methodDescription, Arrays.asList(typeDefinition));
}
/**
* Creates a new parameter type list.
*
* @param methodDescription The method description that declares the parameters.
* @param typeDefinitions A list of detached types representing the parameters.
*/
public ForTypes(MethodDescription.InDefinedShape methodDescription, List typeDefinitions) {
this.methodDescription = methodDescription;
this.typeDefinitions = typeDefinitions;
}
@Override
public ParameterDescription.InDefinedShape get(int index) {
int offset = methodDescription.isStatic() ? 0 : 1;
for (TypeDefinition typeDefinition : typeDefinitions.subList(0, index)) {
offset += typeDefinition.getStackSize().getSize();
}
return new ParameterDescription.Latent(methodDescription, typeDefinitions.get(index).asGenericType(), index, offset);
}
@Override
public int size() {
return typeDefinitions.size();
}
}
}
/**
* A list of parameter descriptions for a list of detached tokens. For the returned parameter, each token is attached to its parameter representation.
*/
class ForTokens extends AbstractBase {
/**
* The method that is declaring the represented token.
*/
private final MethodDescription.InDefinedShape declaringMethod;
/**
* The list of tokens to represent.
*/
private final List tokens;
/**
* Creates a new parameter list for the provided tokens.
*
* @param declaringMethod The method that is declaring the represented token.
* @param tokens The list of tokens to represent.
*/
public ForTokens(MethodDescription.InDefinedShape declaringMethod, List tokens) {
this.declaringMethod = declaringMethod;
this.tokens = tokens;
}
@Override
public ParameterDescription.InDefinedShape get(int index) {
int offset = declaringMethod.isStatic() ? 0 : 1;
for (ParameterDescription.Token token : tokens.subList(0, index)) {
offset += token.getType().getStackSize().getSize();
}
return new ParameterDescription.Latent(declaringMethod, tokens.get(index), index, offset);
}
@Override
public int size() {
return tokens.size();
}
}
/**
* A list of parameter descriptions that yields {@link com.fitbur.bytebuddy.description.method.ParameterDescription.TypeSubstituting}.
*/
class TypeSubstituting extends AbstractBase {
/**
* The method that is declaring the transformed parameters.
*/
private final MethodDescription.InGenericShape declaringMethod;
/**
* The untransformed parameters that are represented by this list.
*/
private final List parameterDescriptions;
/**
* The visitor to apply to the parameter types before returning them.
*/
private final TypeDescription.Generic.Visitor visitor;
/**
* Creates a new type substituting parameter list.
*
* @param declaringMethod The method that is declaring the transformed parameters.
* @param parameterDescriptions The untransformed parameters that are represented by this list.
* @param visitor The visitor to apply to the parameter types before returning them.
*/
public TypeSubstituting(MethodDescription.InGenericShape declaringMethod,
List parameterDescriptions,
TypeDescription.Generic.Visitor visitor) {
this.declaringMethod = declaringMethod;
this.parameterDescriptions = parameterDescriptions;
this.visitor = visitor;
}
@Override
public ParameterDescription.InGenericShape get(int index) {
return new ParameterDescription.TypeSubstituting(declaringMethod, parameterDescriptions.get(index), visitor);
}
@Override
public int size() {
return parameterDescriptions.size();
}
}
/**
* An empty list of parameters.
*
* @param The type of parameter descriptions represented by this list.
*/
class Empty extends FilterableList.Empty> implements ParameterList {
@Override
public boolean hasExplicitMetaData() {
return true;
}
@Override
public TypeList.Generic asTypeList() {
return new TypeList.Generic.Empty();
}
@Override
public ByteCodeElement.Token.TokenList asTokenList(ElementMatcher matcher) {
return new ByteCodeElement.Token.TokenList();
}
@Override
@SuppressWarnings("unchecked")
public ParameterList asDefined() {
return (ParameterList) this;
}
}
}
