/******************************************************************************* | |
* 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; | |
import java.util.List; | |
/** | |
* Switch statement AST node type. | |
* <p> | |
* <pre> | |
* SwitchStatement: | |
* <b>switch</b> <b>(</b> Expression <b>)</b> | |
* <b>{</b> { SwitchCase | Statement } } <b>}</b> | |
* SwitchCase: | |
* <b>case</b> Expression <b>:</b> | |
* <b>default</b> <b>:</b> | |
* </pre> | |
* <code>SwitchCase</code> nodes are treated as a kind of | |
* <code>Statement</code>. | |
* </p> | |
* | |
* @since 2.0 | |
*/ | |
public class SwitchStatement extends Statement { | |
/** | |
* The expression; lazily initialized; defaults to a unspecified, but legal, | |
* expression. | |
*/ | |
private Expression expression = null; | |
/** | |
* The statements and SwitchCase nodes | |
* (element type: <code>Statement</code>). | |
* Defaults to an empty list. | |
*/ | |
private ASTNode.NodeList statements = | |
new ASTNode.NodeList(true, Statement.class); | |
/** | |
* Creates a new unparented switch statement node owned by the given | |
* AST. By default, the swicth statement has an unspecified, but legal, | |
* expression, and an empty list of switch groups. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
SwitchStatement(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
SwitchStatement result = new SwitchStatement(target); | |
result.setLeadingComment(getLeadingComment()); | |
result.setExpression((Expression) getExpression().clone(target)); | |
result.statements().addAll(ASTNode.copySubtrees(target, statements())); | |
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()); | |
acceptChildren(visitor, statements); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the expression of this switch 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 switch 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 SwitchStatement may occur inside an Expression | |
// must check cycles | |
replaceChild(this.expression, expression, true); | |
this.expression = expression; | |
} | |
/** | |
* Returns the live ordered list of statements for this switch statement. | |
* Within this list, <code>SwitchCase</code> nodes mark the start of | |
* the switch groups. | |
* | |
* @return the live list of switch group nodes | |
* (element type: <code>SwitchGroups</code>) | |
*/ | |
public List statements() { | |
return statements; | |
} | |
/* (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()) | |
+ statements.listSize(); | |
} | |
} |