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The official Couchbase JVM Core IO Library
/*
* 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.description.method;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import net.bytebuddy.build.AccessControllerPlugin;
import net.bytebuddy.build.CachedReturnPlugin;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.description.ByteCodeElement;
import net.bytebuddy.description.ModifierReviewable;
import net.bytebuddy.description.NamedElement;
import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.description.annotation.AnnotationList;
import net.bytebuddy.description.annotation.AnnotationSource;
import net.bytebuddy.description.type.TypeDefinition;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.description.type.TypeList;
import net.bytebuddy.implementation.bytecode.StackSize;
import net.bytebuddy.matcher.ElementMatcher;
import net.bytebuddy.utility.dispatcher.JavaDispatcher;
import net.bytebuddy.utility.nullability.AlwaysNull;
import net.bytebuddy.utility.nullability.MaybeNull;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.security.PrivilegedAction;
import java.util.AbstractList;
import java.util.Collections;
import java.util.List;
/**
* Description of the parameter of a Java method or constructor.
*/
public interface ParameterDescription extends AnnotationSource,
NamedElement.WithRuntimeName,
NamedElement.WithOptionalName,
ModifierReviewable.ForParameterDescription,
ByteCodeElement.TypeDependant {
/**
* The prefix for names of an unnamed parameter.
*/
String NAME_PREFIX = "arg";
/**
* Returns the type of this parameter.
*
* @return The type of this parameter.
*/
TypeDescription.Generic getType();
/**
* Returns the method that declares this parameter.
*
* @return The method that declares this parameter.
*/
MethodDescription getDeclaringMethod();
/**
* Returns this parameter's index.
*
* @return The index of this parameter.
*/
int getIndex();
/**
* Checks if this parameter has an explicit modifier. A parameter without a modifier is simply treated as
* if it had a modifier of zero.
*
* @return {@code true} if this parameter defines explicit modifiers.
*/
boolean hasModifiers();
/**
* Returns the offset to the parameter value within the local method variable.
*
* @return The offset of this parameter's value.
*/
int getOffset();
/**
* Represents a parameter description in its generic shape, i.e. in the shape it is defined by a generic or raw type.
*/
interface InGenericShape extends ParameterDescription {
/**
* {@inheritDoc}
*/
MethodDescription.InGenericShape getDeclaringMethod();
}
/**
* Represents a parameter in its defined shape, i.e. in the form it is defined by a class without its type variables being resolved.
*/
interface InDefinedShape extends ParameterDescription {
/**
* {@inheritDoc}
*/
MethodDescription.InDefinedShape getDeclaringMethod();
/**
* An abstract base implementation of a parameter description in its defined shape.
*/
abstract class AbstractBase extends ParameterDescription.AbstractBase implements InDefinedShape {
/**
* {@inheritDoc}
*/
public InDefinedShape asDefined() {
return this;
}
}
}
/**
* A base implementation of a method parameter description.
*/
abstract class AbstractBase extends ModifierReviewable.AbstractBase implements ParameterDescription {
/**
* {@inheritDoc}
*/
public String getName() {
return NAME_PREFIX.concat(String.valueOf(getIndex()));
}
/**
* {@inheritDoc}
*/
public String getInternalName() {
return getName();
}
/**
* {@inheritDoc}
*/
public String getActualName() {
return isNamed()
? getName()
: EMPTY_NAME;
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return EMPTY_MASK;
}
/**
* {@inheritDoc}
*/
@CachedReturnPlugin.Enhance("offset")
public int getOffset() {
TypeList parameterType = getDeclaringMethod().getParameters().asTypeList().asErasures();
int offset = getDeclaringMethod().isStatic()
? StackSize.ZERO.getSize()
: StackSize.SINGLE.getSize();
for (int i = 0; i < getIndex(); i++) {
offset += parameterType.get(i).getStackSize().getSize();
}
return offset;
}
/**
* {@inheritDoc}
*/
public Token asToken(ElementMatcher matcher) {
return new Token(getType().accept(new TypeDescription.Generic.Visitor.Substitutor.ForDetachment(matcher)),
getDeclaredAnnotations(),
isNamed()
? getName()
: Token.NO_NAME,
hasModifiers()
? (Integer) getModifiers()
: Token.NO_MODIFIERS);
}
@Override
@CachedReturnPlugin.Enhance("hashCode")
public int hashCode() {
return getDeclaringMethod().hashCode() ^ getIndex();
}
@Override
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (!(other instanceof ParameterDescription)) {
return false;
}
ParameterDescription parameterDescription = (ParameterDescription) other;
return getDeclaringMethod().equals(parameterDescription.getDeclaringMethod()) && getIndex() == parameterDescription.getIndex();
}
@Override
public String toString() {
StringBuilder stringBuilder = new StringBuilder(Modifier.toString(getModifiers()));
if (getModifiers() != EMPTY_MASK) {
stringBuilder.append(' ');
}
stringBuilder.append(isVarArgs()
? getType().asErasure().getName().replaceFirst("\\[]$", "...")
: getType().asErasure().getName());
return stringBuilder.append(' ').append(getName()).toString();
}
}
/**
* Description of a loaded parameter with support for the information exposed by {@code java.lang.reflect.Parameter}.
*
* @param The type of the {@code java.lang.reflect.Executable} that this list represents.
*/
abstract class ForLoadedParameter extends InDefinedShape.AbstractBase {
/**
* A dispatcher for reading properties from {@code java.lang.reflect.Parameter} instances.
*/
private static final Parameter PARAMETER = doPrivileged(JavaDispatcher.of(Parameter.class));
/**
* The {@code java.lang.reflect.Executable} for which the parameter types are described.
*/
protected final T executable;
/**
* The parameter's index.
*/
protected final int index;
/**
* The parameter annotation source to query.
*/
protected final ParameterAnnotationSource parameterAnnotationSource;
/**
* Creates a new description for a loaded parameter.
*
* @param executable The {@code java.lang.reflect.Executable} for which the parameter types are described.
* @param index The parameter's index.
* @param parameterAnnotationSource The parameter annotation source to query.
*/
protected ForLoadedParameter(T executable, int index, ParameterAnnotationSource parameterAnnotationSource) {
this.executable = executable;
this.index = index;
this.parameterAnnotationSource = parameterAnnotationSource;
}
/**
* 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.
*/
@AccessControllerPlugin.Enhance
private static T doPrivileged(PrivilegedAction action) {
return action.run();
}
/**
* {@inheritDoc}
*/
public String getName() {
return PARAMETER.getName(ParameterList.ForLoadedExecutable.EXECUTABLE.getParameters(executable)[index]);
}
/**
* {@inheritDoc}
*/
public int getIndex() {
return index;
}
/**
* {@inheritDoc}
*/
public boolean isNamed() {
return PARAMETER.isNamePresent(ParameterList.ForLoadedExecutable.EXECUTABLE.getParameters(executable)[index]);
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return PARAMETER.getModifiers(ParameterList.ForLoadedExecutable.EXECUTABLE.getParameters(executable)[index]);
}
/**
* {@inheritDoc}
*/
public boolean hasModifiers() {
// Rational: If a parameter is not named despite the information being attached,
// it is synthetic, i.e. it has non-default modifiers.
return isNamed() || getModifiers() != EMPTY_MASK;
}
/**
* A source for querying parameter annotations.
*/
public interface ParameterAnnotationSource {
/**
* Returns the parameter annotations represented by this source.
*
* @return The parameter annotations as an array indexed by parameter index.
*/
Annotation[][] getParameterAnnotations();
/**
* A source for a loaded constructor.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForLoadedConstructor implements ParameterAnnotationSource {
/**
* The constructor to query for annotations.
*/
private final Constructor constructor;
/**
* Creates a new parameter annotation source for a constructor.
*
* @param constructor The constructor to query for annotations.
*/
public ForLoadedConstructor(Constructor constructor) {
this.constructor = constructor;
}
/**
* {@inheritDoc}
*/
public Annotation[][] getParameterAnnotations() {
return constructor.getParameterAnnotations();
}
}
/**
* A source for a loaded method.
*/
@HashCodeAndEqualsPlugin.Enhance
class ForLoadedMethod implements ParameterAnnotationSource {
/**
* The method to query for annotations.
*/
private final Method method;
/**
* Creates a new parameter annpotation source for a method.
*
* @param method The method to query for annotations.
*/
public ForLoadedMethod(Method method) {
this.method = method;
}
/**
* {@inheritDoc}
*/
public Annotation[][] getParameterAnnotations() {
return method.getParameterAnnotations();
}
}
}
/**
* A proxy for a {@code java.lang.reflect.Parameter}.
*/
@JavaDispatcher.Proxied("java.lang.reflect.Parameter")
protected interface Parameter {
/**
* Returns the given parameter's modifiers.
*
* @param value The parameter to introspect.
* @return The parameter's modifiers.
*/
int getModifiers(Object value);
/**
* Returns {@code true} if the given parameter has an explicit name.
*
* @param value The parameter to introspect.
* @return {@code true} if the given parameter has an explicit name.
*/
boolean isNamePresent(Object value);
/**
* Returns the given parameter's implicit or explicit name.
*
* @param value The parameter to introspect.
* @return The parameter's name.
*/
String getName(Object value);
}
/**
* A description of a loaded {@link Method} parameter for a modern VM.
*/
protected static class OfMethod extends ForLoadedParameter {
/**
* Creates a new description for a loaded method.
*
* @param method The method for which a parameter is represented.
* @param index The index of the parameter.
* @param parameterAnnotationSource The parameter annotation source to query.
*/
protected OfMethod(Method method, int index, ParameterAnnotationSource parameterAnnotationSource) {
super(method, index, parameterAnnotationSource);
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "BC_UNCONFIRMED_CAST", justification = "The implicit field type casting is not understood by Findbugs.")
public MethodDescription.InDefinedShape getDeclaringMethod() {
return new MethodDescription.ForLoadedMethod(executable);
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "BC_UNCONFIRMED_CAST", justification = "The implicit field type casting is not understood by Findbugs.")
public TypeDescription.Generic getType() {
if (TypeDescription.AbstractBase.RAW_TYPES) {
return TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(executable.getParameterTypes()[index]);
}
return new TypeDescription.Generic.LazyProjection.OfMethodParameter(executable, index, executable.getParameterTypes());
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "BC_UNCONFIRMED_CAST", justification = "The implicit field type casting is not understood by Findbugs.")
public AnnotationList getDeclaredAnnotations() {
return new AnnotationList.ForLoadedAnnotations(parameterAnnotationSource.getParameterAnnotations()[index]);
}
}
/**
* A description of a loaded {@link Constructor} parameter for a modern VM.
*/
protected static class OfConstructor extends ForLoadedParameter> {
/**
* Creates a new description for a loaded constructor.
*
* @param constructor The constructor for which a parameter is represented.
* @param index The index of the parameter.
* @param parameterAnnotationSource The parameter annotation source to query.
*/
protected OfConstructor(Constructor constructor, int index, ParameterAnnotationSource parameterAnnotationSource) {
super(constructor, index, parameterAnnotationSource);
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "BC_UNCONFIRMED_CAST", justification = "The implicit field type casting is not understood by Findbugs.")
public MethodDescription.InDefinedShape getDeclaringMethod() {
return new MethodDescription.ForLoadedConstructor(executable);
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "BC_UNCONFIRMED_CAST", justification = "The implicit field type casting is not understood by Findbugs.")
public TypeDescription.Generic getType() {
if (TypeDescription.AbstractBase.RAW_TYPES) {
return TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(executable.getParameterTypes()[index]);
}
return new TypeDescription.Generic.LazyProjection.OfConstructorParameter(executable, index, executable.getParameterTypes());
}
/**
* {@inheritDoc}
*/
@SuppressFBWarnings(value = "BC_UNCONFIRMED_CAST", justification = "The implicit field type casting is not understood by Findbugs")
public AnnotationList getDeclaredAnnotations() {
Annotation[][] annotation = parameterAnnotationSource.getParameterAnnotations();
MethodDescription.InDefinedShape declaringMethod = getDeclaringMethod();
if (annotation.length != declaringMethod.getParameters().size() && declaringMethod.getDeclaringType().isInnerClass()) {
return index == 0
? new AnnotationList.Empty()
: new AnnotationList.ForLoadedAnnotations(annotation[index - 1]);
} else {
return new AnnotationList.ForLoadedAnnotations(annotation[index]);
}
}
}
/**
* Description of a loaded method's parameter on a virtual machine where {@code java.lang.reflect.Parameter}
* is not available.
*/
protected static class OfLegacyVmMethod extends InDefinedShape.AbstractBase {
/**
* The method that declares this parameter.
*/
private final Method method;
/**
* The index of this parameter.
*/
private final int index;
/**
* The type erasures of the represented method.
*/
private final Class[] parameterType;
/**
* The parameter annotation source to query.
*/
private final ParameterAnnotationSource parameterAnnotationSource;
/**
* Creates a legacy representation of a method's parameter.
*
* @param method The method that declares this parameter.
* @param index The index of this parameter.
* @param parameterType The type erasures of the represented method.
* @param parameterAnnotationSource The parameter annotation source to query.
*/
protected OfLegacyVmMethod(Method method, int index, Class[] parameterType, ParameterAnnotationSource parameterAnnotationSource) {
this.method = method;
this.index = index;
this.parameterType = parameterType;
this.parameterAnnotationSource = parameterAnnotationSource;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
if (TypeDescription.AbstractBase.RAW_TYPES) {
return TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(parameterType[index]);
}
return new TypeDescription.Generic.LazyProjection.OfMethodParameter(method, index, parameterType);
}
/**
* {@inheritDoc}
*/
public MethodDescription.InDefinedShape getDeclaringMethod() {
return new MethodDescription.ForLoadedMethod(method);
}
/**
* {@inheritDoc}
*/
public int getIndex() {
return index;
}
/**
* {@inheritDoc}
*/
public boolean isNamed() {
return false;
}
/**
* {@inheritDoc}
*/
public boolean hasModifiers() {
return false;
}
/**
* {@inheritDoc}
*/
public AnnotationList getDeclaredAnnotations() {
return new AnnotationList.ForLoadedAnnotations(parameterAnnotationSource.getParameterAnnotations()[index]);
}
}
/**
* Description of a loaded constructor's parameter on a virtual machine where {@code java.lang.reflect.Parameter}
* is not available.
*/
protected static class OfLegacyVmConstructor extends InDefinedShape.AbstractBase {
/**
* The method that declares this parameter.
*/
private final Constructor constructor;
/**
* The index of this parameter.
*/
private final int index;
/**
* The type erasures of the represented method.
*/
private final Class[] parameterType;
/**
* The parameter annotation source to query.
*/
private final ParameterAnnotationSource parameterAnnotationSource;
/**
* Creates a legacy representation of a method's parameter.
*
* @param constructor The constructor that declares this parameter.
* @param index The index of this parameter.
* @param parameterType The type erasures of the represented method.
* @param parameterAnnotationSource The parameter annotation source to query.
*/
protected OfLegacyVmConstructor(Constructor constructor, int index, Class[] parameterType, ParameterAnnotationSource parameterAnnotationSource) {
this.constructor = constructor;
this.index = index;
this.parameterType = parameterType;
this.parameterAnnotationSource = parameterAnnotationSource;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
if (TypeDescription.AbstractBase.RAW_TYPES) {
return TypeDescription.Generic.OfNonGenericType.ForLoadedType.of(parameterType[index]);
}
return new TypeDescription.Generic.LazyProjection.OfConstructorParameter(constructor, index, parameterType);
}
/**
* {@inheritDoc}
*/
public MethodDescription.InDefinedShape getDeclaringMethod() {
return new MethodDescription.ForLoadedConstructor(constructor);
}
/**
* {@inheritDoc}
*/
public int getIndex() {
return index;
}
/**
* {@inheritDoc}
*/
public boolean isNamed() {
return false;
}
/**
* {@inheritDoc}
*/
public boolean hasModifiers() {
return false;
}
/**
* {@inheritDoc}
*/
public AnnotationList getDeclaredAnnotations() {
MethodDescription.InDefinedShape declaringMethod = getDeclaringMethod();
Annotation[][] parameterAnnotation = parameterAnnotationSource.getParameterAnnotations();
if (parameterAnnotation.length != declaringMethod.getParameters().size() && declaringMethod.getDeclaringType().isInnerClass()) {
return index == 0
? new AnnotationList.Empty()
: new AnnotationList.ForLoadedAnnotations(parameterAnnotation[index - 1]);
} else {
return new AnnotationList.ForLoadedAnnotations(parameterAnnotation[index]);
}
}
}
}
/**
* A latent description of a parameter that is not attached to a method or constructor.
*/
class Latent extends InDefinedShape.AbstractBase {
/**
* The method that is declaring the parameter.
*/
private final MethodDescription.InDefinedShape declaringMethod;
/**
* The type of the parameter.
*/
private final TypeDescription.Generic parameterType;
/**
* The annotations of the parameter.
*/
private final List declaredAnnotations;
/**
* The name of the parameter or {@code null} if no name is explicitly defined.
*/
@MaybeNull
private final String name;
/**
* The modifiers of the parameter or {@code null} if no modifiers are explicitly defined.
*/
@MaybeNull
private final Integer modifiers;
/**
* The index of the parameter.
*/
private final int index;
/**
* The parameter's offset in the local method variables array.
*/
private final int offset;
/**
* Creates a latent parameter description. All provided types are attached to this instance before they are returned.
*
* @param declaringMethod The method that is declaring the parameter.
* @param token The token describing the shape of the parameter.
* @param index The index of the parameter.
* @param offset The parameter's offset in the local method variables array.
*/
public Latent(MethodDescription.InDefinedShape declaringMethod, Token token, int index, int offset) {
this(declaringMethod,
token.getType(),
token.getAnnotations(),
token.getName(),
token.getModifiers(),
index,
offset);
}
/**
* Creates a new latent parameter descriptions for a parameter without explicit meta data or annotations.
*
* @param declaringMethod The method declaring this parameter.
* @param parameterType The type of the parameter.
* @param index The index of the parameter.
* @param offset The offset of the parameter.
*/
public Latent(MethodDescription.InDefinedShape declaringMethod,
TypeDescription.Generic parameterType,
int index,
int offset) {
this(declaringMethod,
parameterType,
Collections.emptyList(),
Token.NO_NAME,
Token.NO_MODIFIERS,
index,
offset);
}
/**
* Creates a latent parameter description. All provided types are attached to this instance before they are returned.
*
* @param declaringMethod The method that is declaring the parameter.
* @param parameterType The parameter's type.
* @param declaredAnnotations The annotations of the parameter.
* @param name The name of the parameter or {@code null} if no name is explicitly defined.
* @param modifiers The modifiers of the parameter or {@code null} if no modifiers are explicitly defined.
* @param index The index of the parameter.
* @param offset The parameter's offset in the local method variables array.
*/
public Latent(MethodDescription.InDefinedShape declaringMethod,
TypeDescription.Generic parameterType,
List declaredAnnotations,
@MaybeNull String name,
@MaybeNull Integer modifiers,
int index,
int offset) {
this.declaringMethod = declaringMethod;
this.parameterType = parameterType;
this.declaredAnnotations = declaredAnnotations;
this.name = name;
this.modifiers = modifiers;
this.index = index;
this.offset = offset;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
return parameterType.accept(TypeDescription.Generic.Visitor.Substitutor.ForAttachment.of(this));
}
/**
* {@inheritDoc}
*/
public MethodDescription.InDefinedShape getDeclaringMethod() {
return declaringMethod;
}
/**
* {@inheritDoc}
*/
public int getIndex() {
return index;
}
/**
* {@inheritDoc}
*/
public int getOffset() {
return offset;
}
/**
* {@inheritDoc}
*/
public boolean isNamed() {
return name != null;
}
/**
* {@inheritDoc}
*/
public boolean hasModifiers() {
return modifiers != null;
}
/**
* {@inheritDoc}
*/
public String getName() {
return name == null
? super.getName()
: name;
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return modifiers == null
? super.getModifiers()
: modifiers;
}
/**
* {@inheritDoc}
*/
public AnnotationList getDeclaredAnnotations() {
return new AnnotationList.Explicit(declaredAnnotations);
}
}
/**
*
* A parameter description that represents a given parameter but with a substituted parameter type.
*
*
* Note: The supplied visitor must assure to not substitute
*
*/
class TypeSubstituting extends AbstractBase implements InGenericShape {
/**
* The method that declares this type-substituted parameter.
*/
private final MethodDescription.InGenericShape declaringMethod;
/**
* The represented parameter.
*/
private final ParameterDescription parameterDescription;
/**
* A visitor that is applied to the parameter type.
*/
private final TypeDescription.Generic.Visitor visitor;
/**
* Creates a new type substituting parameter.
*
* @param declaringMethod The method that declares this type-substituted parameter.
* @param parameterDescription The represented parameter.
* @param visitor A visitor that is applied to the parameter type.
*/
public TypeSubstituting(MethodDescription.InGenericShape declaringMethod,
ParameterDescription parameterDescription,
TypeDescription.Generic.Visitor visitor) {
this.declaringMethod = declaringMethod;
this.parameterDescription = parameterDescription;
this.visitor = visitor;
}
/**
* {@inheritDoc}
*/
public TypeDescription.Generic getType() {
return parameterDescription.getType().accept(visitor);
}
/**
* {@inheritDoc}
*/
public MethodDescription.InGenericShape getDeclaringMethod() {
return declaringMethod;
}
/**
* {@inheritDoc}
*/
public int getIndex() {
return parameterDescription.getIndex();
}
/**
* {@inheritDoc}
*/
public boolean isNamed() {
return parameterDescription.isNamed();
}
/**
* {@inheritDoc}
*/
public boolean hasModifiers() {
return parameterDescription.hasModifiers();
}
/**
* {@inheritDoc}
*/
public int getOffset() {
return parameterDescription.getOffset();
}
/**
* {@inheritDoc}
*/
public String getName() {
return parameterDescription.getName();
}
/**
* {@inheritDoc}
*/
public int getModifiers() {
return parameterDescription.getModifiers();
}
/**
* {@inheritDoc}
*/
public AnnotationList getDeclaredAnnotations() {
return parameterDescription.getDeclaredAnnotations();
}
/**
* {@inheritDoc}
*/
public InDefinedShape asDefined() {
return parameterDescription.asDefined();
}
}
/**
* A token representing a parameter's properties detached from a type.
*/
class Token implements ByteCodeElement.Token {
/**
* Indicator for a method parameter without an explicit name.
*/
@AlwaysNull
public static final String NO_NAME = null;
/**
* Indicator for a method parameter without explicit modifiers.
*/
@AlwaysNull
public static final Integer NO_MODIFIERS = null;
/**
* The type of the represented parameter.
*/
private final TypeDescription.Generic type;
/**
* A list of parameter annotations.
*/
private final List annotations;
/**
* The name of the parameter or {@code null} if no explicit name is defined.
*/
@MaybeNull
private final String name;
/**
* The modifiers of the parameter or {@code null} if no explicit modifiers is defined.
*/
@MaybeNull
private final Integer modifiers;
/**
* Creates a new parameter token without an explicit name, an explicit modifier or annotations.
* The parameter type must be represented in its detached format.
*
* @param type The type of the represented parameter.
*/
public Token(TypeDescription.Generic type) {
this(type, Collections.emptyList());
}
/**
* Creates a new parameter token without an explicit name or an explicit modifier. The parameter type must be represented in its detached format.
*
* @param type The type of the represented parameter.
* @param annotations The annotations of the parameter.
*/
public Token(TypeDescription.Generic type, List annotations) {
this(type, annotations, NO_NAME, NO_MODIFIERS);
}
/**
* Creates a parameter token without annotations. The parameter type must be represented in its detached format.
*
* @param type The type of the represented parameter.
* @param name The name of the parameter or {@code null} if no explicit name is defined.
* @param modifiers The modifiers of the parameter or {@code null} if no explicit modifiers is defined.
*/
public Token(TypeDescription.Generic type, @MaybeNull String name, @MaybeNull Integer modifiers) {
this(type, Collections.emptyList(), name, modifiers);
}
/**
* Creates a new parameter token. The parameter type must be represented in its detached format.
*
* @param type The type of the represented parameter.
* @param annotations The annotations of the parameter.
* @param name The name of the parameter or {@code null} if no explicit name is defined.
* @param modifiers The modifiers of the parameter or {@code null} if no explicit modifiers is defined.
*/
public Token(TypeDescription.Generic type,
List annotations,
@MaybeNull String name,
@MaybeNull Integer modifiers) {
this.type = type;
this.annotations = annotations;
this.name = name;
this.modifiers = modifiers;
}
/**
* Returns the type of the represented method parameter.
*
* @return The type of the represented method parameter.
*/
public TypeDescription.Generic getType() {
return type;
}
/**
* Returns the annotations of the represented method parameter.
*
* @return The annotations of the represented method parameter.
*/
public AnnotationList getAnnotations() {
return new AnnotationList.Explicit(annotations);
}
/**
* Returns the name of the represented method parameter.
*
* @return The name of the parameter or {@code null} if no explicit name is defined.
*/
@MaybeNull
public String getName() {
return name;
}
/**
* Returns the modifiers of the represented method parameter.
*
* @return The modifiers of the parameter or {@code null} if no explicit modifiers is defined.
*/
@MaybeNull
public Integer getModifiers() {
return modifiers;
}
/**
* {@inheritDoc}
*/
public Token accept(TypeDescription.Generic.Visitor visitor) {
return new Token(type.accept(visitor),
annotations,
name,
modifiers);
}
@Override
@CachedReturnPlugin.Enhance("hashCode")
public int hashCode() {
int result = type.hashCode();
result = 31 * result + annotations.hashCode();
result = 31 * result + (name != null ? name.hashCode() : 0);
result = 31 * result + (modifiers != null ? modifiers.hashCode() : 0);
return result;
}
@Override
public boolean equals(@MaybeNull Object other) {
if (this == other) {
return true;
} else if (!(other instanceof Token)) {
return false;
}
Token token = (Token) other;
return type.equals(token.type)
&& annotations.equals(token.annotations)
&& (name != null ? name.equals(token.name) : token.name == null)
&& (modifiers != null ? modifiers.equals(token.modifiers) : token.modifiers == null);
}
@Override
public String toString() {
return "ParameterDescription.Token{" +
"type=" + type +
", annotations=" + annotations +
", name='" + name + '\'' +
", modifiers=" + modifiers +
'}';
}
/**
* A list of types represented as a list of parameter tokens.
*/
public static class TypeList extends AbstractList {
/**
* The list of types to represent as parameter tokens.
*/
private final List typeDescriptions;
/**
* Creates a new list of types that represent parameters.
*
* @param typeDescriptions The types to represent.
*/
public TypeList(List typeDescriptions) {
this.typeDescriptions = typeDescriptions;
}
/**
* {@inheritDoc}
*/
public Token get(int index) {
return new Token(typeDescriptions.get(index).asGenericType());
}
/**
* {@inheritDoc}
*/
public int size() {
return typeDescriptions.size();
}
}
}
}
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