/******************************************************************************* | |
* Copyright (c) 2001 International Business Machines Corp. and others. | |
* All rights reserved. This program and the accompanying materials | |
* are made available under the terms of the Common Public License v0.5 | |
* which accompanies this distribution, and is available at | |
* http://www.eclipse.org/legal/cpl-v05.html | |
* | |
* Contributors: | |
* IBM Corporation - initial API and implementation | |
******************************************************************************/ | |
package org.eclipse.jdt.core.dom; | |
/** | |
* Array access expression AST node type. | |
* | |
* <pre> | |
* ArrayAccess: | |
* Expression <b>[</b> Expression <b>]</b> | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class ArrayAccess extends Expression { | |
/** | |
* The array expression; lazily initialized; defaults to an unspecified, | |
* but legal, expression. | |
*/ | |
private Expression arrayExpression = null; | |
/** | |
* The index expression; lazily initialized; defaults to an unspecified, | |
* but legal, expression. | |
*/ | |
private Expression indexExpression = null; | |
/** | |
* Creates a new unparented array access expression node owned by the given | |
* AST. By default, the array and index expresssions are unspecified, | |
* but legal. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
ArrayAccess(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
ArrayAccess result = new ArrayAccess(target); | |
result.setArray((Expression) getArray().clone(target)); | |
result.setIndex((Expression) getIndex().clone(target)); | |
return result; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
public boolean subtreeMatch(ASTMatcher matcher, Object other) { | |
// dispatch to correct overloaded match method | |
return matcher.match(this, other); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
void accept0(ASTVisitor visitor) { | |
boolean visitChildren = visitor.visit(this); | |
if (visitChildren) { | |
// visit children in normal left to right reading order | |
acceptChild(visitor, getArray()); | |
acceptChild(visitor, getIndex()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the array expression of this array access expression. | |
* | |
* @return the array expression node | |
*/ | |
public Expression getArray() { | |
if (arrayExpression == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setArray(new SimpleName(getAST())); | |
} | |
return arrayExpression; | |
} | |
/** | |
* Sets the array expression of this array access expression. | |
* | |
* @param expression the array expression node | |
* @exception $precondition-violation:different-ast$ | |
* @exception $precondition-violation:not-unparented$ | |
* @exception $postcondition-violation:ast-cycle$ | |
*/ | |
public void setArray(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// an ArrayAccess may occur inside an Expression | |
// must check cycles | |
replaceChild(this.arrayExpression, expression, true); | |
this.arrayExpression = expression; | |
} | |
/** | |
* Returns the index expression of this array access expression. | |
* | |
* @return the index expression node | |
*/ | |
public Expression getIndex() { | |
if (indexExpression == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setIndex(new SimpleName(getAST())); | |
} | |
return indexExpression; | |
} | |
/** | |
* Sets the index expression of this array access expression. | |
* | |
* @param expression the index expression node | |
* @exception $precondition-violation:different-ast$ | |
* @exception $precondition-violation:not-unparented$ | |
* @exception $postcondition-violation:ast-cycle$ | |
*/ | |
public void setIndex(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// an ArrayAccess may occur inside an Expression | |
// must check cycles | |
replaceChild(this.indexExpression, expression, true); | |
this.indexExpression = expression; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
return BASE_NODE_SIZE + 2 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (arrayExpression == null ? 0 : getArray().treeSize()) | |
+ (indexExpression == null ? 0 : getIndex().treeSize()); | |
} | |
} | |