/******************************************************************************* | |
* 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; | |
/** | |
* Field access expression AST node type. | |
* | |
* <pre> | |
* FieldAccess: | |
* Expression <b>.</b> Identifier | |
* </pre> | |
*/ | |
public class FieldAccess extends Expression { | |
/** | |
* The expression; lazily initialized; defaults to an unspecified, | |
* but legal, simple name. | |
*/ | |
private Expression expression = null; | |
/** | |
* The field; lazily initialized; defaults to an unspecified, | |
* but legal, simple field name. | |
*/ | |
private SimpleName fieldName = null; | |
/** | |
* Creates a new unparented node for a field access expression owned by the | |
* given AST. By default, the expression and field are both unspecified, | |
* but legal, names. | |
* <p> | |
* N.B. This constructor is package-private. | |
* </p> | |
* | |
* @param ast the AST that is to own this node | |
*/ | |
FieldAccess(AST ast) { | |
super(ast); | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
public int getNodeType() { | |
return FIELD_ACCESS; | |
} | |
/* (omit javadoc for this method) | |
* Method declared on ASTNode. | |
*/ | |
ASTNode clone(AST target) { | |
FieldAccess result = new FieldAccess(target); | |
result.setExpression((Expression) getExpression().clone(target)); | |
result.setName((SimpleName) getName().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, getName()); | |
} | |
visitor.endVisit(this); | |
} | |
/** | |
* Returns the expression of this field access expression. | |
* | |
* @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 field access expression. | |
* | |
* @param expression the new expression | |
* @exception IllegalArgumentException if: | |
* <ul> | |
* <li>the node belongs to a different AST</li> | |
* <li>the node already has a parent</li> | |
* <li>a cycle in would be created</li> | |
* </ul> | |
*/ | |
public void setExpression(Expression expression) { | |
if (expression == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a FieldAccess may occur inside an Expression - must check cycles | |
replaceChild((ASTNode) this.expression, (ASTNode) expression, true); | |
this.expression = expression; | |
} | |
/** | |
* Returns the name of the field accessed in this field access expression. | |
* | |
* @return the field name | |
*/ | |
public SimpleName getName() { | |
if (fieldName == null) { | |
setName(new SimpleName(getAST())); | |
} | |
return fieldName; | |
} | |
/** | |
* Sets the name of the field accessed in this field access expression. | |
* | |
* @param fieldName the field name | |
* @exception IllegalArgumentException if: | |
* <ul> | |
* <li>the node belongs to a different AST</li> | |
* <li>the node already has a parent</li> | |
* </ul> | |
*/ | |
public void setName(SimpleName fieldName) { | |
if (fieldName == null) { | |
throw new IllegalArgumentException(); | |
} | |
// a FieldAccess cannot occur inside a SimpleName | |
replaceChild(this.fieldName, fieldName, false); | |
this.fieldName = fieldName; | |
} | |
/* (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() | |
+ (expression == null ? 0 : getExpression().treeSize()) | |
+ (fieldName == null ? 0 : getName().treeSize()); | |
} | |
} | |