/******************************************************************************* | |
* 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; | |
/** | |
* Throw statement AST node type. | |
* | |
* <pre> | |
* ThrowStatement: | |
* <b>throw</b> Expression <b>;</b> | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class ThrowStatement extends Statement { | |
/** | |
* The expression; lazily initialized; defaults to a unspecified, but legal, | |
* expression. | |
*/ | |
private Expression expression = null; | |
/** | |
* Creates a new unparented throw statement node owned by the given | |
* AST. By default, the throw statement has an unspecified, but legal, | |
* expression. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
ThrowStatement(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
ThrowStatement result = new ThrowStatement(target); | |
result.setLeadingComment(getLeadingComment()); | |
result.setExpression((Expression) getExpression().clone(target)); | |
return result; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
boolean equalSubtrees(Object other) { | |
if (!(other instanceof ThrowStatement)) { | |
return false; | |
} | |
ThrowStatement o = (ThrowStatement) other; | |
return ASTNode.equalNodes(getExpression(), o.getExpression()); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
void accept0(ASTVisitor visitor) { | |
boolean visitChildren = visitor.visit(this); | |
if (visitChildren) { | |
acceptChild(visitor, getExpression()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the expression of this throw 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 throw statement. | |
* | |
* @param expression the new expression node | |
* @exception $precondition-violation:different-ast$ | |
* @exception $precondition-violation:not-unparented$ | |
* @exception $postcondition-violation:ast-cycle$ | |
*/ | |
public void setExpression(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a ThrowStatement may occur inside an Expression | |
// must check cycles | |
replaceChild(this.expression, expression, true); | |
this.expression = expression; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
return super.memSize() + 1 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (expression == null ? 0 : getExpression().treeSize()); | |
} | |
} | |