/******************************************************************************* | |
* 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; | |
/** | |
* While statement AST node type. | |
* | |
* <pre> | |
* WhileStatement: | |
* <b>while</b> <b>(</b> Expression <b>)</b> Statement | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class WhileStatement extends Statement { | |
/** | |
* The expression; lazily initialized; defaults to an unspecified, but | |
* legal, expression. | |
*/ | |
private Expression expression = null; | |
/** | |
* The body statement; lazily initialized; defaults to an empty block | |
* statement. | |
*/ | |
private Statement body = null; | |
/** | |
* Creates a new unparented while statement node owned by the given | |
* AST. By default, the expresssion is unspecified, but legal, and | |
* the body statement is an empty block. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
WhileStatement(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
public int getNodeType() { | |
return WHILE_STATEMENT; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
WhileStatement result = new WhileStatement(target); | |
result.setLeadingComment(getLeadingComment()); | |
result.setExpression((Expression) getExpression().clone(target)); | |
result.setBody((Statement) getBody().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, getExpression()); | |
acceptChild(visitor, getBody()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the expression of this while statement. | |
* | |
* @return the expression node | |
*/ | |
public Expression getExpression() { | |
if (expression == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setExpression(new SimpleName(getAST())); | |
} | |
return expression; | |
} | |
/** | |
* Sets the expression of this while statement. | |
* | |
* @param expression the expression node | |
* @exception IllegalArgumentException if: | |
* <ul> | |
* <li>the node belongs to a different AST</li> | |
* <li>the node already has a parent</li> | |
* <li>a cycle in would be created</li> | |
* </ul> | |
*/ | |
public void setExpression(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a WhileStatement may occur inside an Expression - must check cycles | |
replaceChild(this.expression, expression, true); | |
this.expression = expression; | |
} | |
/** | |
* Returns the body of this while statement. | |
* | |
* @return the body statement node | |
*/ | |
public Statement getBody() { | |
if (body == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setBody(new Block(getAST())); | |
} | |
return body; | |
} | |
/** | |
* Sets the body of this while statement. | |
* | |
* @param statement the body statement node | |
* @exception IllegalArgumentException if: | |
* <ul> | |
* <li>the node belongs to a different AST</li> | |
* <li>the node already has a parent</li> | |
* <li>a cycle in would be created</li> | |
* </ul> | |
*/ | |
public void setBody(Statement statement) { | |
if (statement == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a WhileStatement may occur inside a Statement - must check cycles | |
replaceChild(this.body, statement, true); | |
this.body = statement; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
return super.memSize() + 2 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (expression == null ? 0 : getExpression().treeSize()) | |
+ (body == null ? 0 : getBody().treeSize()); | |
} | |
} | |