/******************************************************************************* | |
* 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; | |
/** | |
* Variable declaration fragment AST node type, used in field declarations, | |
* local variable declarations, and <code>ForStatement</code> initializers. | |
* It contrast to <code>SingleVariableDeclaration</code>, fragments are | |
* missing the modifiers and the type; these are located in the fragment's | |
* parent node. | |
* | |
* <pre> | |
* VariableDeclarationFragment: | |
* Identifier { <b>[</b><b>]</b> } [ <b>=</b> Expression ] | |
* </pre> | |
* | |
* @since 2.0 | |
*/ | |
public class VariableDeclarationFragment extends VariableDeclaration { | |
/** | |
* The variable name; lazily initialized; defaults to an unspecified, | |
* legal Java identifier. | |
*/ | |
private SimpleName variableName = null; | |
/** | |
* The number of extra array dimensions that this variable; | |
* defaults to 0. | |
*/ | |
private int extraArrayDimensions = 0; | |
/** | |
* The initializer expression, or <code>null</code> if none; | |
* defaults to none. | |
*/ | |
private Expression optionalInitializer = null; | |
/** | |
* Creates a new AST node for a variable declaration fragment owned by the | |
* given AST. By default, the variable declaration has: an unspecified | |
* (but legal) variable name, no initializer, and no extra array dimensions. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
VariableDeclarationFragment(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
VariableDeclarationFragment result = new VariableDeclarationFragment(target); | |
result.setName((SimpleName) getName().clone(target)); | |
result.setExtraDimensions(getExtraDimensions()); | |
result.setInitializer( | |
(Expression) ASTNode.copySubtree(target, getInitializer())); | |
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, getName()); | |
acceptChild(visitor, getInitializer()); | |
} | |
visitor.endVisit(this); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on VariableDeclaration. | |
*/ | |
public SimpleName getName() { | |
if (variableName == null) { | |
// lazy initialize - use setter to ensure parent link set too | |
setName(new SimpleName(getAST())); | |
} | |
return variableName; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on VariableDeclaration. | |
*/ | |
public void setName(SimpleName variableName) { | |
if (variableName == null) { | |
throw new IllegalArgumentException(); | |
} | |
replaceChild(this.variableName, variableName, false); | |
this.variableName = variableName; | |
} | |
/** | |
* Returns the number of extra array dimensions this variable has over | |
* and above the type specified in the enclosing declaration. | |
* <p> | |
* For example, in the AST for <code>int[] i, j[], k[][]</code> the | |
* variable declaration fragments for the variables <code>i</code>, | |
* <code>j</code>, and <code>k</code>, have 0, 1, and 2 extra array | |
* dimensions, respectively. | |
* </p> | |
* | |
* @return the number of extra array dimensions | |
*/ | |
public int getExtraDimensions() { | |
return extraArrayDimensions; | |
} | |
/** | |
* Sets the number of extra array dimensions this variable has over | |
* and above the type specified in the enclosing declaration. | |
* | |
* @return the number of extra array dimensions | |
* @see Modifier | |
* @exception $precondition-violation:negaitve-dimensions$ | |
*/ | |
public void setExtraDimensions(int dimensions) { | |
if (dimensions < 0) { | |
throw new IllegalArgumentException(); | |
} | |
modifying(); | |
this.extraArrayDimensions = dimensions; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on VariableDeclaration. | |
*/ | |
public Expression getInitializer() { | |
return optionalInitializer; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on VariableDeclaration. | |
*/ | |
public void setInitializer(Expression initializer) { | |
// a SingleVariableDeclaration may occur inside an Expression | |
// must check cycles | |
replaceChild(this.optionalInitializer, initializer, true); | |
this.optionalInitializer = initializer; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int memSize() { | |
// treat Operator as free | |
return BASE_NODE_SIZE + 3 * 4; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
int treeSize() { | |
return | |
memSize() | |
+ (variableName == null ? 0 : getName().treeSize()) | |
+ (optionalInitializer == null ? 0 : getInitializer().treeSize()); | |
} | |
} |