/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.core.dom;
import java.util.ArrayList;
import java.util.List;
/**
* Enhanced For statement AST node type (added in JLS3 API).
*
* <pre>
* EnhancedForStatement:
* <b>for</b> <b>(</b> FormalParameter <b>:</b> Expression <b>)</b>
* Statement
* </pre>
*
* <p>The FormalParameter is represented by a {@link SingleVariableDeclaration}
* (without an initializer).</p>
*
* @since 3.1
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public class EnhancedForStatement extends Statement {
/**
* The "parameter" structural property of this node type (child type: {@link SingleVariableDeclaration}).
*/
public static final ChildPropertyDescriptor PARAMETER_PROPERTY =
new ChildPropertyDescriptor(EnhancedForStatement.class, "parameter", SingleVariableDeclaration.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
/**
* The "expression" structural property of this node type (child type: {@link Expression}).
*/
public static final ChildPropertyDescriptor EXPRESSION_PROPERTY =
new ChildPropertyDescriptor(EnhancedForStatement.class, "expression", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
/**
* The "body" structural property of this node type (child type: {@link Statement}).
*/
public static final ChildPropertyDescriptor BODY_PROPERTY =
new ChildPropertyDescriptor(EnhancedForStatement.class, "body", Statement.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
/**
* A list of property descriptors (element type:
* {@link StructuralPropertyDescriptor}),
* or null if uninitialized.
*/
private static final List PROPERTY_DESCRIPTORS;
static {
List properyList = new ArrayList(4);
createPropertyList(EnhancedForStatement.class, properyList);
addProperty(PARAMETER_PROPERTY, properyList);
addProperty(EXPRESSION_PROPERTY, properyList);
addProperty(BODY_PROPERTY, properyList);
PROPERTY_DESCRIPTORS = reapPropertyList(properyList);
}
/**
* Returns a list of structural property descriptors for this node type.
* Clients must not modify the result.
*
* @param apiLevel the API level; one of the
* <code>AST.JLS*</code> constants
* @return a list of property descriptors (element type:
* {@link StructuralPropertyDescriptor})
*/
public static List propertyDescriptors(int apiLevel) {
return PROPERTY_DESCRIPTORS;
}
/**
* The parameter; lazily initialized; defaults to a unspecified,
* legal node.
*/
private SingleVariableDeclaration parameter = null;
/**
* The expression; lazily initialized; defaults to a unspecified, but legal,
* expression.
*/
private Expression expression = null;
/**
* The body statement; lazily initialized; defaults to an empty block
* statement.
*/
private Statement body = null;
/**
* Creates a new AST node for an enchanced for statement owned by the
* given AST. By default, the parameter and expression are unspecified
* but legal subtrees, and the body is an empty block.
*
* @param ast the AST that is to own this node
*/
EnhancedForStatement(AST ast) {
super(ast);
unsupportedIn2();
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final List internalStructuralPropertiesForType(int apiLevel) {
return propertyDescriptors(apiLevel);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
if (property == PARAMETER_PROPERTY) {
if (get) {
return getParameter();
} else {
setParameter((SingleVariableDeclaration) child);
return null;
}
}
if (property == EXPRESSION_PROPERTY) {
if (get) {
return getExpression();
} else {
setExpression((Expression) child);
return null;
}
}
if (property == BODY_PROPERTY) {
if (get) {
return getBody();
} else {
setBody((Statement) child);
return null;
}
}
// allow default implementation to flag the error
return super.internalGetSetChildProperty(property, get, child);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final int getNodeType0() {
return ENHANCED_FOR_STATEMENT;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
ASTNode clone0(AST target) {
EnhancedForStatement result = new EnhancedForStatement(target);
result.setSourceRange(getStartPosition(), getLength());
result.copyLeadingComment(this);
result.setParameter((SingleVariableDeclaration) getParameter().clone(target));
result.setExpression((Expression) getExpression().clone(target));
result.setBody(
(Statement) ASTNode.copySubtree(target, getBody()));
return result;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
final boolean subtreeMatch0(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, getParameter());
acceptChild(visitor, getExpression());
acceptChild(visitor, getBody());
}
visitor.endVisit(this);
}
/**
* Returns the formal parameter in this enhanced for statement.
*
* @return the parameter
*/
public SingleVariableDeclaration getParameter() {
if (this.parameter == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.parameter == null) {
preLazyInit();
this.parameter = this.ast.newSingleVariableDeclaration();
postLazyInit(this.parameter, PARAMETER_PROPERTY);
}
}
}
return this.parameter;
}
/**
* Sets the formal parameter in this enhanced for statement.
*
* @param parameter the new parameter
* @exception IllegalArgumentException if:
* <ul>
* <li>the node belongs to a different AST</li>
* <li>the node already has a parent</li>
* </ul>
*/
public void setParameter(SingleVariableDeclaration parameter) {
if (parameter == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.parameter;
preReplaceChild(oldChild, parameter, PARAMETER_PROPERTY);
this.parameter = parameter;
postReplaceChild(oldChild, parameter, PARAMETER_PROPERTY);
}
/**
* Returns the expression of this enhanced for statement.
*
* @return the expression node
*/
public Expression getExpression() {
if (this.expression == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.expression == null) {
preLazyInit();
this.expression = new SimpleName(this.ast);
postLazyInit(this.expression, EXPRESSION_PROPERTY);
}
}
}
return this.expression;
}
/**
* Sets the expression of this enhanced for statement.
*
* @param expression the new expression node
* @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();
}
ASTNode oldChild = this.expression;
preReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
this.expression = expression;
postReplaceChild(oldChild, expression, EXPRESSION_PROPERTY);
}
/**
* Returns the body of this enchanced for statement.
*
* @return the body statement node
*/
public Statement getBody() {
if (this.body == null) {
// lazy init must be thread-safe for readers
synchronized (this) {
if (this.body == null) {
preLazyInit();
this.body = new Block(this.ast);
postLazyInit(this.body, BODY_PROPERTY);
}
}
}
return this.body;
}
/**
* Sets the body of this enhanced for statement.
*
* @param statement the body statement node
* @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 setBody(Statement statement) {
if (statement == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.body;
preReplaceChild(oldChild, statement, BODY_PROPERTY);
this.body = statement;
postReplaceChild(oldChild, statement, BODY_PROPERTY);
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int memSize() {
return super.memSize() + 3 * 4;
}
/* (omit javadoc for this method)
* Method declared on ASTNode.
*/
int treeSize() {
return
memSize()
+ (this.parameter == null ? 0 : getParameter().treeSize())
+ (this.expression == null ? 0 : getExpression().treeSize())
+ (this.body == null ? 0 : getBody().treeSize());
}
}