/*******************************************************************************
* Copyright (c) 2000, 2010 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
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.lookup;
import org.eclipse.jdt.internal.compiler.ast.Wildcard;
/**
* Binding denoting a method after type parameter substitutions got performed.
* On parameterized type bindings, all methods got substituted, regardless whether
* their signature did involve generics or not, so as to get the proper declaringClass for
* these methods.
*/
public class ParameterizedMethodBinding extends MethodBinding {
protected MethodBinding originalMethod;
/**
* Create method of parameterized type, substituting original parameters/exception/return type with type arguments.
*/
public ParameterizedMethodBinding(final ParameterizedTypeBinding parameterizedDeclaringClass, MethodBinding originalMethod) {
super(
originalMethod.modifiers,
originalMethod.selector,
originalMethod.returnType,
originalMethod.parameters,
originalMethod.thrownExceptions,
parameterizedDeclaringClass);
this.originalMethod = originalMethod;
/* missing type bit cannot be copied as is it might come from the return type or a parameter type that
* is substituted by a raw type.
*/
this.tagBits = originalMethod.tagBits & ~TagBits.HasMissingType;
final TypeVariableBinding[] originalVariables = originalMethod.typeVariables;
Substitution substitution = null;
final int length = originalVariables.length;
final boolean isStatic = originalMethod.isStatic();
if (length == 0) {
this.typeVariables = Binding.NO_TYPE_VARIABLES;
if (!isStatic) substitution = parameterizedDeclaringClass;
} else {
// at least fix up the declaringElement binding + bound substitution if non static
final TypeVariableBinding[] substitutedVariables = new TypeVariableBinding[length];
for (int i = 0; i < length; i++) { // copy original type variable to relocate
TypeVariableBinding originalVariable = originalVariables[i];
substitutedVariables[i] = new TypeVariableBinding(originalVariable.sourceName, this, originalVariable.rank, parameterizedDeclaringClass.environment);
}
this.typeVariables = substitutedVariables;
// need to substitute old var refs with new ones (double substitution: declaringClass + new type variables)
substitution = new Substitution() {
public LookupEnvironment environment() {
return parameterizedDeclaringClass.environment;
}
public boolean isRawSubstitution() {
return !isStatic && parameterizedDeclaringClass.isRawSubstitution();
}
public TypeBinding substitute(TypeVariableBinding typeVariable) {
// check this variable can be substituted given copied variables
if (typeVariable.rank < length && originalVariables[typeVariable.rank] == typeVariable) {
return substitutedVariables[typeVariable.rank];
}
if (!isStatic)
return parameterizedDeclaringClass.substitute(typeVariable);
return typeVariable;
}
};
// initialize new variable bounds
for (int i = 0; i < length; i++) {
TypeVariableBinding originalVariable = originalVariables[i];
TypeVariableBinding substitutedVariable = substitutedVariables[i];
TypeBinding substitutedSuperclass = Scope.substitute(substitution, originalVariable.superclass);
ReferenceBinding[] substitutedInterfaces = Scope.substitute(substitution, originalVariable.superInterfaces);
if (originalVariable.firstBound != null) {
substitutedVariable.firstBound = originalVariable.firstBound == originalVariable.superclass
? substitutedSuperclass // could be array type or interface
: substitutedInterfaces[0];
}
switch (substitutedSuperclass.kind()) {
case Binding.ARRAY_TYPE :
substitutedVariable.superclass = parameterizedDeclaringClass.environment.getResolvedType(TypeConstants.JAVA_LANG_OBJECT, null);
substitutedVariable.superInterfaces = substitutedInterfaces;
break;
default:
if (substitutedSuperclass.isInterface()) {
substitutedVariable.superclass = parameterizedDeclaringClass.environment.getResolvedType(TypeConstants.JAVA_LANG_OBJECT, null);
int interfaceCount = substitutedInterfaces.length;
System.arraycopy(substitutedInterfaces, 0, substitutedInterfaces = new ReferenceBinding[interfaceCount+1], 1, interfaceCount);
substitutedInterfaces[0] = (ReferenceBinding) substitutedSuperclass;
substitutedVariable.superInterfaces = substitutedInterfaces;
} else {
substitutedVariable.superclass = (ReferenceBinding) substitutedSuperclass; // typeVar was extending other typeVar which got substituted with interface
substitutedVariable.superInterfaces = substitutedInterfaces;
}
}
}
}
if (substitution != null) {
this.returnType = Scope.substitute(substitution, this.returnType);
this.parameters = Scope.substitute(substitution, this.parameters);
this.thrownExceptions = Scope.substitute(substitution, this.thrownExceptions);
// error case where exception type variable would have been substituted by a non-reference type (207573)
if (this.thrownExceptions == null) this.thrownExceptions = Binding.NO_EXCEPTIONS;
}
checkMissingType: {
if ((this.tagBits & TagBits.HasMissingType) != 0)
break checkMissingType;
if ((this.returnType.tagBits & TagBits.HasMissingType) != 0) {
this.tagBits |= TagBits.HasMissingType;
break checkMissingType;
}
for (int i = 0, max = this.parameters.length; i < max; i++) {
if ((this.parameters[i].tagBits & TagBits.HasMissingType) != 0) {
this.tagBits |= TagBits.HasMissingType;
break checkMissingType;
}
}
for (int i = 0, max = this.thrownExceptions.length; i < max; i++) {
if ((this.thrownExceptions[i].tagBits & TagBits.HasMissingType) != 0) {
this.tagBits |= TagBits.HasMissingType;
break checkMissingType;
}
}
}
}
/**
* Create method of parameterized type, substituting original parameters/exception/return type with type arguments.
* This is a CODE ASSIST method ONLY.
*/
public ParameterizedMethodBinding(final ReferenceBinding declaringClass, MethodBinding originalMethod, char[][] alternateParamaterNames, final LookupEnvironment environment) {
super(
originalMethod.modifiers,
originalMethod.selector,
originalMethod.returnType,
originalMethod.parameters,
originalMethod.thrownExceptions,
declaringClass);
this.originalMethod = originalMethod;
/* missing type bit cannot be copied as is it might come from the return type or a parameter type that
* is substituted by a raw type.
*/
this.tagBits = originalMethod.tagBits & ~TagBits.HasMissingType;
final TypeVariableBinding[] originalVariables = originalMethod.typeVariables;
Substitution substitution = null;
final int length = originalVariables.length;
if (length == 0) {
this.typeVariables = Binding.NO_TYPE_VARIABLES;
} else {
// at least fix up the declaringElement binding + bound substitution if non static
final TypeVariableBinding[] substitutedVariables = new TypeVariableBinding[length];
for (int i = 0; i < length; i++) { // copy original type variable to relocate
TypeVariableBinding originalVariable = originalVariables[i];
substitutedVariables[i] = new TypeVariableBinding(
alternateParamaterNames == null ?
originalVariable.sourceName :
alternateParamaterNames[i],
this,
originalVariable.rank,
environment);
}
this.typeVariables = substitutedVariables;
// need to substitute old var refs with new ones (double substitution: declaringClass + new type variables)
substitution = new Substitution() {
public LookupEnvironment environment() {
return environment;
}
public boolean isRawSubstitution() {
return false;
}
public TypeBinding substitute(TypeVariableBinding typeVariable) {
// check this variable can be substituted given copied variables
if (typeVariable.rank < length && originalVariables[typeVariable.rank] == typeVariable) {
return substitutedVariables[typeVariable.rank];
}
return typeVariable;
}
};
// initialize new variable bounds
for (int i = 0; i < length; i++) {
TypeVariableBinding originalVariable = originalVariables[i];
TypeVariableBinding substitutedVariable = substitutedVariables[i];
TypeBinding substitutedSuperclass = Scope.substitute(substitution, originalVariable.superclass);
ReferenceBinding[] substitutedInterfaces = Scope.substitute(substitution, originalVariable.superInterfaces);
if (originalVariable.firstBound != null) {
substitutedVariable.firstBound = originalVariable.firstBound == originalVariable.superclass
? substitutedSuperclass // could be array type or interface
: substitutedInterfaces[0];
}
switch (substitutedSuperclass.kind()) {
case Binding.ARRAY_TYPE :
substitutedVariable.superclass = environment.getResolvedType(TypeConstants.JAVA_LANG_OBJECT, null);
substitutedVariable.superInterfaces = substitutedInterfaces;
break;
default:
if (substitutedSuperclass.isInterface()) {
substitutedVariable.superclass = environment.getResolvedType(TypeConstants.JAVA_LANG_OBJECT, null);
int interfaceCount = substitutedInterfaces.length;
System.arraycopy(substitutedInterfaces, 0, substitutedInterfaces = new ReferenceBinding[interfaceCount+1], 1, interfaceCount);
substitutedInterfaces[0] = (ReferenceBinding) substitutedSuperclass;
substitutedVariable.superInterfaces = substitutedInterfaces;
} else {
substitutedVariable.superclass = (ReferenceBinding) substitutedSuperclass; // typeVar was extending other typeVar which got substituted with interface
substitutedVariable.superInterfaces = substitutedInterfaces;
}
}
}
}
if (substitution != null) {
this.returnType = Scope.substitute(substitution, this.returnType);
this.parameters = Scope.substitute(substitution, this.parameters);
this.thrownExceptions = Scope.substitute(substitution, this.thrownExceptions);
// error case where exception type variable would have been substituted by a non-reference type (207573)
if (this.thrownExceptions == null) this.thrownExceptions = Binding.NO_EXCEPTIONS;
}
checkMissingType: {
if ((this.tagBits & TagBits.HasMissingType) != 0)
break checkMissingType;
if ((this.returnType.tagBits & TagBits.HasMissingType) != 0) {
this.tagBits |= TagBits.HasMissingType;
break checkMissingType;
}
for (int i = 0, max = this.parameters.length; i < max; i++) {
if ((this.parameters[i].tagBits & TagBits.HasMissingType) != 0) {
this.tagBits |= TagBits.HasMissingType;
break checkMissingType;
}
}
for (int i = 0, max = this.thrownExceptions.length; i < max; i++) {
if ((this.thrownExceptions[i].tagBits & TagBits.HasMissingType) != 0) {
this.tagBits |= TagBits.HasMissingType;
break checkMissingType;
}
}
}
}
public ParameterizedMethodBinding() {
// no init
}
/**
* The type of x.getClass() is substituted from 'Class<? extends Object>' into: 'Class<? extends raw(X)>
*/
public static ParameterizedMethodBinding instantiateGetClass(TypeBinding receiverType, MethodBinding originalMethod, Scope scope) {
ParameterizedMethodBinding method = new ParameterizedMethodBinding();
method.modifiers = originalMethod.modifiers;
method.selector = originalMethod.selector;
method.declaringClass = originalMethod.declaringClass;
method.typeVariables = Binding.NO_TYPE_VARIABLES;
method.originalMethod = originalMethod;
method.parameters = originalMethod.parameters;
method.thrownExceptions = originalMethod.thrownExceptions;
method.tagBits = originalMethod.tagBits;
ReferenceBinding genericClassType = scope.getJavaLangClass();
LookupEnvironment environment = scope.environment();
TypeBinding rawType = environment.convertToRawType(receiverType.erasure(), false /*do not force conversion of enclosing types*/);
method.returnType = environment.createParameterizedType(
genericClassType,
new TypeBinding[] { environment.createWildcard(genericClassType, 0, rawType, null /*no extra bound*/, Wildcard.EXTENDS) },
null);
if ((method.returnType.tagBits & TagBits.HasMissingType) != 0) {
method.tagBits |= TagBits.HasMissingType;
}
return method;
}
/**
* Returns true if some parameters got substituted.
*/
public boolean hasSubstitutedParameters() {
return this.parameters != this.originalMethod.parameters;
}
/**
* Returns true if the return type got substituted.
*/
public boolean hasSubstitutedReturnType() {
return this.returnType != this.originalMethod.returnType;
}
/**
* Returns the original method (as opposed to parameterized instances)
*/
public MethodBinding original() {
return this.originalMethod.original();
}
}