/******************************************************************************* | |
* 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; | |
/** | |
* Conditional expression AST node type. | |
* | |
* <pre> | |
* ConditionalExpression: | |
* Expression <b>?</b> Expression <b>:</b> Expression | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class ConditionalExpression extends Expression { | |
/** | |
* The condition expression; lazily initialized; defaults to an unspecified, | |
* but legal, expression. | |
*/ | |
private Expression conditionExpression = null; | |
/** | |
* The "then" expression; lazily initialized; defaults to an unspecified, | |
* but legal, expression. | |
*/ | |
private Expression thenExpression = null; | |
/** | |
* The "else" expression; lazily initialized; defaults to an unspecified, | |
* but legal, expression. | |
*/ | |
private Expression elseExpression = null; | |
/** | |
* Creates a new unparented conditional expression node owned by the given | |
* AST. By default, the condition, "then", and "else" expresssions are | |
* unspecified, but legal. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
ConditionalExpression(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
ConditionalExpression result = new ConditionalExpression(target); | |
result.setExpression((Expression) getExpression().clone(target)); | |
result.setThenExpression( | |
(Expression) getThenExpression().clone(target)); | |
result.setElseExpression( | |
(Expression) getElseExpression().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, getThenExpression()); | |
acceptChild(visitor, getElseExpression()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the condition of this conditional expression. | |
* | |
* @return the condition node | |
*/ | |
public Expression getExpression() { | |
if (conditionExpression == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setExpression(new SimpleName(getAST())); | |
} | |
return conditionExpression; | |
} | |
/** | |
* Sets the condition of this conditional expression. | |
* | |
* @param expression the condition 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 ConditionalExpression may occur inside an Expression | |
// must check cycles | |
replaceChild(this.conditionExpression, expression, true); | |
this.conditionExpression = expression; | |
} | |
/** | |
* Returns the "then" part of this conditional expression. | |
* | |
* @return the "then" expression node | |
*/ | |
public Expression getThenExpression() { | |
if (thenExpression == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setThenExpression(new SimpleName(getAST())); | |
} | |
return thenExpression; | |
} | |
/** | |
* Sets the "then" part of this conditional expression. | |
* | |
* @param expression the "then" expression node | |
* @exception $precondition-violation:different-ast$ | |
* @exception $precondition-violation:not-unparented$ | |
* @exception $postcondition-violation:ast-cycle$ | |
*/ | |
public void setThenExpression(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a ConditionalExpression may occur inside an Expression | |
// must check cycles | |
replaceChild(this.thenExpression, expression, true); | |
this.thenExpression = expression; | |
} | |
/** | |
* Returns the "else" part of this conditional expression. | |
* | |
* @return the "else" expression node | |
*/ | |
public Expression getElseExpression() { | |
if (elseExpression == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setElseExpression(new SimpleName(getAST())); | |
} | |
return elseExpression; | |
} | |
/** | |
* Sets the "else" part of this conditional expression. | |
* | |
* @param expression the "else" expression node | |
* @exception $precondition-violation:different-ast$ | |
* @exception $precondition-violation:not-unparented$ | |
* @exception $postcondition-violation:ast-cycle$ | |
*/ | |
public void setElseExpression(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a ConditionalExpression may occur inside an Expression | |
// must check cycles | |
replaceChild(this.elseExpression, expression, true); | |
this.elseExpression = expression; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
// treat Code as free | |
return BASE_NODE_SIZE + 3 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (conditionExpression == null ? 0 : getExpression().treeSize()) | |
+ (thenExpression == null ? 0 : getThenExpression().treeSize()) | |
+ (elseExpression == null ? 0 : getElseExpression().treeSize()); | |
} | |
} |