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/*******************************************************************************
* Copyright (c) 2000, 2009 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 java.util.List;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.impl.Constant;
public final class ArrayBinding extends TypeBinding {
// creation and initialization of the length field
// the declaringClass of this field is intentionally set to null so it can be distinguished.
public static final FieldBinding ArrayLength = new FieldBinding(TypeConstants.LENGTH, TypeBinding.INT, ClassFileConstants.AccPublic | ClassFileConstants.AccFinal, null, Constant.NotAConstant);
public TypeBinding leafComponentType;
public int dimensions;
LookupEnvironment environment;
char[] constantPoolName;
char[] genericTypeSignature;
public ArrayBinding(TypeBinding type, int dimensions, LookupEnvironment environment) {
this.tagBits |= TagBits.IsArrayType;
this.leafComponentType = type;
this.dimensions = dimensions;
this.environment = environment;
if (type instanceof UnresolvedReferenceBinding)
((UnresolvedReferenceBinding) type).addWrapper(this, environment);
else
this.tagBits |= type.tagBits & (TagBits.HasTypeVariable | TagBits.HasDirectWildcard | TagBits.HasMissingType | TagBits.ContainsNestedTypeReferences);
}
public TypeBinding closestMatch() {
if (isValidBinding()) {
return this;
}
TypeBinding leafClosestMatch = this.leafComponentType.closestMatch();
if (leafClosestMatch == null) {
return null;
}
return this.environment.createArrayType(this.leafComponentType.closestMatch(), this.dimensions);
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#collectMissingTypes(java.util.List)
*/
public List collectMissingTypes(List missingTypes) {
if ((this.tagBits & TagBits.HasMissingType) != 0) {
missingTypes = this.leafComponentType.collectMissingTypes(missingTypes);
}
return missingTypes;
}
/**
* Collect the substitutes into a map for certain type variables inside the receiver type
* e.g. Collection.collectSubstitutes(Collection>, Map), will populate Map with: T --> List
* Constraints:
* A << F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_EXTENDS (1))
* A = F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_EQUAL (0))
* A >> F corresponds to: F.collectSubstitutes(..., A, ..., CONSTRAINT_SUPER (2))
*/
public void collectSubstitutes(Scope scope, TypeBinding actualType, InferenceContext inferenceContext, int constraint) {
if ((this.tagBits & TagBits.HasTypeVariable) == 0) return;
if (actualType == TypeBinding.NULL) return;
switch(actualType.kind()) {
case Binding.ARRAY_TYPE :
int actualDim = actualType.dimensions();
if (actualDim == this.dimensions) {
this.leafComponentType.collectSubstitutes(scope, actualType.leafComponentType(), inferenceContext, constraint);
} else if (actualDim > this.dimensions) {
ArrayBinding actualReducedType = this.environment.createArrayType(actualType.leafComponentType(), actualDim - this.dimensions);
this.leafComponentType.collectSubstitutes(scope, actualReducedType, inferenceContext, constraint);
}
break;
case Binding.TYPE_PARAMETER :
//TypeVariableBinding variable = (TypeVariableBinding) otherType;
// TODO (philippe) should consider array bounds, and recurse
break;
}
}
/*
* brakets leafUniqueKey
* p.X[][] --> [[Lp/X;
*/
public char[] computeUniqueKey(boolean isLeaf) {
char[] brackets = new char[this.dimensions];
for (int i = this.dimensions - 1; i >= 0; i--) brackets[i] = '[';
return CharOperation.concat(brackets, this.leafComponentType.computeUniqueKey(isLeaf));
}
/**
* Answer the receiver's constant pool name.
* NOTE: This method should only be used during/after code gen.
* e.g. '[Ljava/lang/Object;'
*/
public char[] constantPoolName() {
if (this.constantPoolName != null)
return this.constantPoolName;
char[] brackets = new char[this.dimensions];
for (int i = this.dimensions - 1; i >= 0; i--) brackets[i] = '[';
return this.constantPoolName = CharOperation.concat(brackets, this.leafComponentType.signature());
}
public String debugName() {
StringBuffer brackets = new StringBuffer(this.dimensions * 2);
for (int i = this.dimensions; --i >= 0;)
brackets.append("[]"); //$NON-NLS-1$
return this.leafComponentType.debugName() + brackets.toString();
}
public int dimensions() {
return this.dimensions;
}
/* Answer an array whose dimension size is one less than the receiver.
*
* When the receiver's dimension size is one then answer the leaf component type.
*/
public TypeBinding elementsType() {
if (this.dimensions == 1) return this.leafComponentType;
return this.environment.createArrayType(this.leafComponentType, this.dimensions - 1);
}
/**
* @see org.eclipse.jdt.internal.compiler.lookup.TypeBinding#erasure()
*/
public TypeBinding erasure() {
TypeBinding erasedType = this.leafComponentType.erasure();
if (this.leafComponentType != erasedType)
return this.environment.createArrayType(erasedType, this.dimensions);
return this;
}
public LookupEnvironment environment() {
return this.environment;
}
public char[] genericTypeSignature() {
if (this.genericTypeSignature == null) {
char[] brackets = new char[this.dimensions];
for (int i = this.dimensions - 1; i >= 0; i--) brackets[i] = '[';
this.genericTypeSignature = CharOperation.concat(brackets, this.leafComponentType.genericTypeSignature());
}
return this.genericTypeSignature;
}
public PackageBinding getPackage() {
return this.leafComponentType.getPackage();
}
public int hashCode() {
return this.leafComponentType == null ? super.hashCode() : this.leafComponentType.hashCode();
}
/* Answer true if the receiver type can be assigned to the argument type (right)
*/
public boolean isCompatibleWith(TypeBinding otherType) {
if (this == otherType)
return true;
switch (otherType.kind()) {
case Binding.ARRAY_TYPE :
ArrayBinding otherArray = (ArrayBinding) otherType;
if (otherArray.leafComponentType.isBaseType())
return false; // relying on the fact that all equal arrays are identical
if (this.dimensions == otherArray.dimensions)
return this.leafComponentType.isCompatibleWith(otherArray.leafComponentType);
if (this.dimensions < otherArray.dimensions)
return false; // cannot assign 'String[]' into 'Object[][]' but can assign 'byte[][]' into 'Object[]'
break;
case Binding.BASE_TYPE :
return false;
case Binding.WILDCARD_TYPE :
case Binding.INTERSECTION_TYPE :
return ((WildcardBinding) otherType).boundCheck(this);
case Binding.TYPE_PARAMETER :
// check compatibility with capture of ? super X
if (otherType.isCapture()) {
CaptureBinding otherCapture = (CaptureBinding) otherType;
TypeBinding otherLowerBound;
if ((otherLowerBound = otherCapture.lowerBound) != null) {
if (!otherLowerBound.isArrayType()) return false;
return isCompatibleWith(otherLowerBound);
}
}
return false;
}
//Check dimensions - Java does not support explicitly sized dimensions for types.
//However, if it did, the type checking support would go here.
switch (otherType.leafComponentType().id) {
case TypeIds.T_JavaLangObject :
case TypeIds.T_JavaLangCloneable :
case TypeIds.T_JavaIoSerializable :
return true;
}
return false;
}
public int kind() {
return ARRAY_TYPE;
}
public TypeBinding leafComponentType(){
return this.leafComponentType;
}
/* API
* Answer the problem id associated with the receiver.
* NoError if the receiver is a valid binding.
*/
public int problemId() {
return this.leafComponentType.problemId();
}
/**
* Answer the source name for the type.
* In the case of member types, as the qualified name from its top level type.
* For example, for a member type N defined inside M & A: "A.M.N".
*/
public char[] qualifiedSourceName() {
char[] brackets = new char[this.dimensions * 2];
for (int i = this.dimensions * 2 - 1; i >= 0; i -= 2) {
brackets[i] = ']';
brackets[i - 1] = '[';
}
return CharOperation.concat(this.leafComponentType.qualifiedSourceName(), brackets);
}
public char[] readableName() /* java.lang.Object[] */ {
char[] brackets = new char[this.dimensions * 2];
for (int i = this.dimensions * 2 - 1; i >= 0; i -= 2) {
brackets[i] = ']';
brackets[i - 1] = '[';
}
return CharOperation.concat(this.leafComponentType.readableName(), brackets);
}
public char[] shortReadableName(){
char[] brackets = new char[this.dimensions * 2];
for (int i = this.dimensions * 2 - 1; i >= 0; i -= 2) {
brackets[i] = ']';
brackets[i - 1] = '[';
}
return CharOperation.concat(this.leafComponentType.shortReadableName(), brackets);
}
public char[] sourceName() {
char[] brackets = new char[this.dimensions * 2];
for (int i = this.dimensions * 2 - 1; i >= 0; i -= 2) {
brackets[i] = ']';
brackets[i - 1] = '[';
}
return CharOperation.concat(this.leafComponentType.sourceName(), brackets);
}
public void swapUnresolved(UnresolvedReferenceBinding unresolvedType, ReferenceBinding resolvedType, LookupEnvironment env) {
if (this.leafComponentType == unresolvedType) {
this.leafComponentType = env.convertUnresolvedBinaryToRawType(resolvedType);
this.tagBits |= this.leafComponentType.tagBits & (TagBits.HasTypeVariable | TagBits.HasDirectWildcard | TagBits.HasMissingType);
}
}
public String toString() {
return this.leafComponentType != null ? debugName() : "NULL TYPE ARRAY"; //$NON-NLS-1$
}
}
