/******************************************************************************* | |
* 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; | |
/** | |
* Switch case AST node type. A switch case is a special kind of node used only | |
* in switch statements. It is a <code>Statement</code> in name only. | |
* <p> | |
* <pre> | |
* SwitchCase: | |
* <b>case</b> Expression <b>:</b> | |
* <b>default</b> <b>:</b> | |
* </pre> | |
* </p> | |
* | |
* @since 2.0 | |
*/ | |
public class SwitchCase extends Statement { | |
/** | |
* The expression; <code>null</code> for none; lazily initialized (but | |
* does <b>not</b> default to none). | |
* @see #expressionInitialized | |
*/ | |
private Expression optionalExpression = null; | |
/** | |
* Indicates whether <code>optionalExpression</code> has been initialized. | |
*/ | |
private boolean expressionInitialized = false; | |
/** | |
* Creates a new AST node for a switch case pseudo-statement owned by the | |
* given AST. By default, there is an unspecified, but legal, expression. | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
SwitchCase(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
SwitchCase result = new SwitchCase(target); | |
result.setLeadingComment(getLeadingComment()); | |
result.setExpression( | |
(Expression) ASTNode.copySubtree(target, getExpression())); | |
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, getExpression()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the expression of this switch case, or | |
* <code>null</code> if there is none (the "default:" case). | |
* | |
* @return the expression node, or <code>null</code> if there is none | |
*/ | |
public Expression getExpression() { | |
if (!expressionInitialized) { | |
// lazy initialize - use setter to ensure parent link set too | |
setExpression(new SimpleName(getAST())); | |
} | |
return optionalExpression; | |
} | |
/** | |
* Sets the expression of this switch case, or clears it (turns it into | |
* the "default:" case). | |
* | |
* @param expression the expression node, or <code>null</code> to | |
* turn it into the "default:" case | |
* @exception $precondition-violation:different-ast$ | |
* @exception $precondition-violation:not-unparented$ | |
* @exception $postcondition-violation:ast-cycle$ | |
*/ | |
public void setExpression(Expression expression) { | |
// a ReturnStatement may occur inside an Expression - must check cycles | |
replaceChild(this.optionalExpression, expression, true); | |
this.optionalExpression = expression; | |
expressionInitialized = true; | |
} | |
/** | |
* Returns whether this switch case represents the "default:" case. | |
* <p> | |
* This convenience method is equivalent to | |
* <code>getExpression() == null</code>. | |
* </p> | |
* | |
* @return <code>true</code> if this is the default switch case, and | |
* <code>false</code> if this is a non-default switch case | |
*/ | |
public boolean isDefault() { | |
return getExpression() == null; | |
} | |
/* (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() | |
+ (optionalExpression == null ? 0 : optionalExpression.treeSize()); | |
} | |
} |