org.eclipse.jdt.core.dom.IMethodBinding Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contribution for
* Bug 429813 - [1.8][dom ast] IMethodBinding#getJavaElement() should return IMethod for lambda
*******************************************************************************/
package org.eclipse.jdt.core.dom;
/**
* A method binding represents a method or constructor of a class or interface.
* Method bindings usually correspond directly to method or
* constructor declarations found in the source code.
* However, in certain cases of references to a generic method,
* the method binding may correspond to a copy of a generic method
* declaration with substitutions for the method's type parameters
* (for these, getTypeArguments
returns a non-empty
* list, and either isParameterizedMethod
or
* isRawMethod
returns true
).
* And in certain cases of references to a method declared in a
* generic type, the method binding may correspond to a copy of a
* method declaration with substitutions for the type's type
* parameters (for these, getTypeArguments
returns
* an empty list, and both isParameterizedMethod
and
* isRawMethod
return false
).
*
* @see ITypeBinding#getDeclaredMethods()
* @since 2.0
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface IMethodBinding extends IBinding {
/**
* Returns whether this binding is for a constructor or a method.
*
* @return true
if this is the binding for a constructor,
* and false
if this is the binding for a method
*/
public boolean isConstructor();
/**
* Returns whether this binding is known to be a compiler-generated
* default constructor.
*
* This method returns false
for:
*
* - methods
* - constructors with more than one parameter
* - 0-argument constructors where the binding information was obtained
* from a Java source file containing an explicit 0-argument constructor
* declaration
* - 0-argument constructors where the binding information was obtained
* from a Java class file (it is not possible to determine from a
* class file whether a 0-argument constructor was present in the source
* code versus generated automatically by a Java compiler)
*
*
* @return true
if this is known to be the binding for a
* compiler-generated default constructor, and false
* otherwise
* @since 3.0
*/
public boolean isDefaultConstructor();
/**
* Returns the name of the method declared in this binding. The method name
* is always a simple identifier. The name of a constructor is always the
* same as the declared name of its declaring class.
*
* @return the name of this method, or the declared name of this
* constructor's declaring class
*/
public String getName();
/**
* Returns the type binding representing the class or interface
* that declares this method or constructor.
*
* @return the binding of the class or interface that declares this method
* or constructor
*/
public ITypeBinding getDeclaringClass();
/**
* If this method binding represents a lambda expression then:
*
* - If the lambda expression is declared in the body of a method,
* answers the binding of that declaring method.
*
* - Otherwise, if the lambda expression is declared in the
* initializer of a field, answers the binding of that declaring field.
*
* - Otherwise, if the lambda expression is declared in a static initializer or an
* instance initializer, a method binding is returned to represent that initializer
* (selector is an empty string in this case).
*
*
*
* If this method binding does not represent a lambda expression,
* null
is returned.
*
* @return a method binding or field binding representing the member that
* contains the lambda expression represented by this method binding,
* or null for regular method bindings.
* @since 3.11
*/
public IBinding getDeclaringMember();
/**
* Returns the resolved default value of an annotation type member,
* or null
if the member has no default value, or if this
* is not the binding for an annotation type member.
*
* Resolved values are represented as follows (same as for
* {@link IMemberValuePairBinding#getValue()}):
*
* - Primitive type - the equivalent boxed object
* - java.lang.Class - the
ITypeBinding
for the class object
* - java.lang.String - the string value itself
* - enum type - the
IVariableBinding
for the enum constant
* - annotation type - an
IAnnotationBinding
* - array type - an
Object[]
whose elements are as per above
* (the language only allows single dimensional arrays in annotations)
*
*
* @return the default value of this annotation type member, or null
* if none or not applicable
* @since 3.2
*/
public Object getDefaultValue();
/**
* Returns the resolved declaration annotations of a parameter of this method.
* The result returned is the same regardless of whether
* this is a parameterized method.
*
* Note: This method only returns declaration annotations.
* Type annotations in the sense of JLS8 9.7.4 are not returned.
* Type annotations can be retrieved from a parameter type
* via {@link ITypeBinding#getTypeAnnotations()}.
*
*
* @param paramIndex the index of the parameter of interest
* @return the resolved declaration annotations of the paramIndex
th parameter,
* or an empty list if there are none
* @throws ArrayIndexOutOfBoundsException if paramIndex
is
* not a valid index
* @since 3.2
*/
public IAnnotationBinding[] getParameterAnnotations(int paramIndex);
/**
* Returns a list of type bindings representing the formal parameter types,
* in declaration order, of this method or constructor. Returns an array of
* length 0 if this method or constructor does not takes any parameters.
*
* Note that the binding for the last parameter type of a vararg method
* declaration like void fun(Foo... args)
is always for
* an array type (i.e., Foo[]
) reflecting the the way varargs
* get compiled. However, the type binding obtained directly from
* the SingleVariableDeclaration
for the vararg parameter
* is always for the type as written; i.e., the type binding for
* Foo
.
*
*
* Note: The result does not include synthetic parameters introduced by
* inner class emulation. Explicit receiver parameters are also not included.
*
*
* @return a (possibly empty) list of type bindings for the formal
* parameters of this method or constructor
*/
public ITypeBinding[] getParameterTypes();
/**
* Returns the type of this method's receiver or null
* if there is no receiver declared explicitly.
*
* @return the type of this method's receiver or null
* if there is no receiver declared explicitly.
*
* @since 3.10
*/
public ITypeBinding getDeclaredReceiverType();
/**
* Returns the binding for the return type of this method. Returns the
* special primitive void
return type for constructors.
*
* For methods, the type binding that is returned contains type annotations
* if any. For e.g. the following code would get the type annotations on a
* method:
* IAnnotationBinding[] annots = getReturnType().getTypeAnnotations()
*
* For a constructor, the returned binding does not include type annotations.
*
* @return the binding for the return type of this method, or the
* void
return type for constructors
*/
public ITypeBinding getReturnType();
/**
* Returns a list of type bindings representing the types of the exceptions thrown
* by this method or constructor. Returns an array of length 0 if this method
* throws no exceptions. The resulting types are in no particular order.
*
* @return a list of type bindings for exceptions
* thrown by this method or constructor
*/
public ITypeBinding[] getExceptionTypes();
/**
* Returns the type parameters of this method or constructor binding.
*
* Note that type parameters only occur on the binding of the
* declaring generic method. Type bindings corresponding to a raw or
* parameterized reference to a generic method do not carry type
* parameters (they instead have non-empty type arguments
* and non-trivial erasure).
*
*
* @return the list of binding for the type variables for the type
* parameters of this method, or otherwise the empty list
* @see ITypeBinding#isTypeVariable()
* @since 3.1
*/
public ITypeBinding[] getTypeParameters();
/**
* Returns whether this is the binding for an annotation type member.
*
* @return true
iff this is the binding for an annotation type member
* and false
otherwise
* @since 3.2
*/
public boolean isAnnotationMember();
/**
* Returns whether this method binding represents a declaration of
* a generic method.
*
* Note that type parameters only occur on the binding of the
* declaring generic method; e.g., public <T> T identity(T t);
.
* Method bindings corresponding to a raw or parameterized reference to a generic
* method do not carry type parameters (they instead have non-empty type arguments
* and non-trivial erasure).
* This method is fully equivalent to getTypeParameters().length > 0)
.
*
*
* Note that {@link #isGenericMethod()},
* {@link #isParameterizedMethod()},
* and {@link #isRawMethod()} are mutually exclusive.
*
*
* @return true
if this method binding represents a
* declaration of a generic method, and false
otherwise
* @see #getTypeParameters()
* @since 3.1
*/
public boolean isGenericMethod();
/**
* Returns whether this method binding represents an instance of
* a generic method corresponding to a parameterized method reference.
*
* Note that {@link #isGenericMethod()},
* {@link #isParameterizedMethod()},
* and {@link #isRawMethod()} are mutually exclusive.
*
*
* @return true
if this method binding represents a
* an instance of a generic method corresponding to a parameterized
* method reference, and false
otherwise
* @see #getMethodDeclaration()
* @see #getTypeArguments()
* @since 3.1
*/
public boolean isParameterizedMethod();
/**
* Returns the type arguments of this generic method instance, or the
* empty list for other method bindings.
*
* Note that type arguments only occur on a method binding that represents
* an instance of a generic method corresponding to a raw or parameterized
* reference to a generic method. Do not confuse these with type parameters
* which only occur on the method binding corresponding directly to the
* declaration of a generic method.
*
*
* @return the list of type bindings for the type arguments used to
* instantiate the corrresponding generic method, or otherwise the empty list
* @see #getMethodDeclaration()
* @see #isParameterizedMethod()
* @see #isRawMethod()
* @since 3.1
*/
public ITypeBinding[] getTypeArguments();
/**
* Returns the binding for the method declaration corresponding to this
* method binding.
*
* - For parameterized methods ({@link #isParameterizedMethod()})
* and raw methods ({@link #isRawMethod()}), this method returns the binding
* for the corresponding generic method.
* - For references to the method {@link Object#getClass() Object.getClass()},
* returns the binding for the method declaration which is declared to return
*
Class<?>
or Class<? extends Object>
. In the
* reference binding, the return type becomes
* Class<? extends
R>
, where R
* is the erasure of the static type of the receiver of the method invocation.
* - For references to a signature polymorphic method from class MethodHandle,
* returns the declaration of the method. In the reference binding, the parameter types and
* the return type are determined by the concrete invocation context.
* - For lambda methods, returns the (possibly parameterized) single abstract method
* of the functional type.
* - For other method bindings, this returns the same binding.
*
*
* @return the method binding
* @since 3.1
*/
public IMethodBinding getMethodDeclaration();
/**
* Returns whether this method binding represents an instance of
* a generic method corresponding to a raw method reference.
*
* Note that {@link #isGenericMethod()},
* {@link #isParameterizedMethod()},
* and {@link #isRawMethod()} are mutually exclusive.
*
*
* @return true
if this method binding represents a
* an instance of a generic method corresponding to a raw
* method reference, and false
otherwise
* @see #getMethodDeclaration()
* @see #getTypeArguments()
* @since 3.1
*/
public boolean isRawMethod();
/**
* Returns whether this method's signature is a subsignature of the given method as
* specified in section 8.4.2 of The Java Language Specification, Third Edition (JLS3).
*
* @return true
if this method's signature is a subsignature of the given method
* @since 3.1
*/
public boolean isSubsignature(IMethodBinding otherMethod);
/**
* Returns whether this is a variable arity method.
*
* Note: Variable arity ("varargs") methods were added in JLS3.
*
*
* @return true
if this is a variable arity method,
* and false
otherwise
* @since 3.1
*/
public boolean isVarargs();
/**
* Returns whether this method overrides the given method,
* as specified in section 8.4.8.1 of The Java Language
* Specification, Third Edition (JLS3).
*
* @param method the method that is possibly overriden
* @return true
if this method overrides the given method,
* and false
otherwise
* @since 3.1
*/
public boolean overrides(IMethodBinding method);
}