/******************************************************************************* | |
* 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; | |
/** | |
* Assert statement AST node type. | |
* | |
* <pre> | |
* AssertStatement: | |
* <b>assert</b> Expression [ <b>:</b> Expression ] <b>;</b> | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class AssertStatement extends Statement { | |
/** | |
* The expression; lazily initialized; defaults to a unspecified, but legal, | |
* expression. | |
*/ | |
private Expression expression = null; | |
/** | |
* The message expression; <code>null</code> for none; defaults to none. | |
*/ | |
private Expression optionalMessageExpression = null; | |
/** | |
* Creates a new unparented assert statement node owned by the given | |
* AST. By default, the assert statement has an unspecified, but legal, | |
* expression, and not message expression. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
AssertStatement(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
public int getNodeType() { | |
return ASSERT_STATEMENT; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
AssertStatement result = new AssertStatement(target); | |
result.setLeadingComment(getLeadingComment()); | |
result.setExpression( | |
(Expression) ASTNode.copySubtree(target, getExpression())); | |
result.setMessage( | |
(Expression) ASTNode.copySubtree(target, getMessage())); | |
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, getMessage()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the first expression of this assert 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 first expression of this assert statement. | |
* | |
* @param expression the new 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(); | |
} | |
// an AssertStatement may occur inside an Expression - must check cycles | |
replaceChild(this.expression, expression, true); | |
this.expression = expression; | |
} | |
/** | |
* Returns the message expression of this assert statement, or | |
* <code>null</code> if there is none. | |
* | |
* @return the message expression node, or <code>null</code> if there | |
* is none | |
*/ | |
public Expression getMessage() { | |
return optionalMessageExpression; | |
} | |
/** | |
* Sets or clears the message expression of this assert statement. | |
* | |
* @param expression the message expression node, or <code>null</code> if | |
* there is none | |
* @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 setMessage(Expression expression) { | |
// an AsertStatement may occur inside an Expression - must check cycles | |
replaceChild(this.optionalMessageExpression, expression, true); | |
this.optionalMessageExpression = expression; | |
} | |
/* (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()) | |
+ (optionalMessageExpression == null ? 0 : getMessage().treeSize()); | |
} | |
} | |