/******************************************************************************* | |
* 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; | |
/** | |
* Simple or qualified "this" AST node type. | |
* | |
* <pre> | |
* ThisExpression: | |
* [ ClassName <b>.</b> ] <b>this</b> | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class ThisExpression extends Expression { | |
/** | |
* The optional qualifier; <code>null</code> for none; defaults to none. | |
*/ | |
private Name optionalQualifier = null; | |
/** | |
* Creates a new AST node for a "this" expression owned by the | |
* given AST. By default, there is no qualifier. | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
ThisExpression(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
public int getNodeType() { | |
return THIS_EXPRESSION; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
ThisExpression result = new ThisExpression(target); | |
result.setQualifier((Name) ASTNode.copySubtree(target, getQualifier())); | |
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) { | |
acceptChild(visitor, getQualifier()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the qualifier of this "this" expression, or | |
* <code>null</code> if there is none. | |
* | |
* @return the qualifier name node, or <code>null</code> if there is none | |
*/ | |
public Name getQualifier() { | |
return optionalQualifier; | |
} | |
/** | |
* Sets or clears the qualifier of this "this" expression. | |
* | |
* @param name the qualifier name node, or <code>null</code> if | |
* there is none | |
* @exception IllegalArgumentException if the node belongs to a different AST | |
* @exception IllegalArgumentException if the node already has a parent | |
*/ | |
public void setQualifier(Name name) { | |
// a ThisExpression cannot occur inside an Expression | |
replaceChild(this.optionalQualifier, name, false); | |
this.optionalQualifier = name; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
// treat Operator as free | |
return BASE_NODE_SIZE + 1 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (optionalQualifier == null ? 0 : getQualifier().treeSize()); | |
} | |
} |