/******************************************************************************* | |
* 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; | |
/** | |
* Catch clause AST node type. | |
* | |
* <pre> | |
* CatchClause: | |
* <b>catch</b> <b>(</b> FormalParameter <b>)</b> Block | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class CatchClause extends ASTNode { | |
/** | |
* The body; lazily initialized; defaults to an empty block. | |
*/ | |
private Block body = null; | |
/** | |
* The exception variable declaration; lazily initialized; defaults to a | |
* unspecified, but legal, variable declaration. | |
*/ | |
private SingleVariableDeclaration exceptionDecl = null; | |
/** | |
* Creates a new AST node for a catch clause owned by the given | |
* AST. By default, the catch clause declares an unspecified, but legal, | |
* exception declaration and has an empty block. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
CatchClause(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
public int getNodeType() { | |
return CATCH_CLAUSE; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
CatchClause result = new CatchClause(target); | |
result.setBody((Block) getBody().clone(target)); | |
result.setException( | |
(SingleVariableDeclaration) ASTNode.copySubtree(target, getException())); | |
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, getException()); | |
acceptChild(visitor, getBody()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the exception variable declaration of this catch clause. | |
* | |
* @return the exception variable declaration node | |
*/ | |
public SingleVariableDeclaration getException() { | |
if (exceptionDecl == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setException(new SingleVariableDeclaration(getAST())); | |
} | |
return exceptionDecl; | |
} | |
/** | |
* Sets the variable declaration of this catch clause. | |
* | |
* @param decl the exception variable declaration node | |
* @exception IllegalArgumentException if the node belongs to a different AST | |
* @exception IllegalArgumentException if the node already has a parent | |
* @exception IllegalArgumentException if a cycle in would be created | |
*/ | |
public void setException(SingleVariableDeclaration exception) { | |
if (exception == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a CatchClause may occur inside an | |
// SingleVariableDeclaration - must check cycles | |
replaceChild(this.exceptionDecl, exception, true); | |
this.exceptionDecl= exception; | |
} | |
/** | |
* Returns the body of this catch clause. | |
* | |
* @return the catch clause body | |
*/ | |
public Block getBody() { | |
if (body == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setBody(new Block(getAST())); | |
} | |
return body; | |
} | |
/** | |
* Sets the body of this catch clause. | |
* | |
* @param body the catch clause block node | |
* @exception IllegalArgumentException if the node belongs to a different AST | |
* @exception IllegalArgumentException if the node already has a parent | |
* @exception IllegalArgumentException if a cycle in would be created | |
*/ | |
public void setBody(Block body) { | |
if (body == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a CatchClause may occur in a Block - must check cycles | |
replaceChild(this.body, body, true); | |
this.body = body; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
// treat Code as free | |
return BASE_NODE_SIZE + 2 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (exceptionDecl == null ? 0 : getException().treeSize()) | |
+ (body == null ? 0 : getBody().treeSize()); | |
} | |
} |