/*******************************************************************************
* Copyright (c) 2009 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
* Zend Technologies
*******************************************************************************/
package org2.eclipse.php.internal.core.ast.nodes;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org2.eclipse.php.internal.core.PHPVersion;
import org2.eclipse.php.internal.core.ast.match.ASTMatcher;
import org2.eclipse.php.internal.core.ast.visitor.Visitor;
/**
* Represents a single element of array.
* Holds the key and the value both can be any expression
* The key can be null
* <pre>e.g.<pre> 1,
* 'Dodo'=>'Golo',
* $a,
* $b=>foo(),
* 1=>$myClass->getFirst() *
*/
public class ArrayElement extends ASTNode {
private Expression key;
private Expression value;
/**
* The structural property of this node type.
*/
public static final ChildPropertyDescriptor KEY_PROPERTY =
new ChildPropertyDescriptor(ArrayElement.class, "key", Expression.class, OPTIONAL, CYCLE_RISK); //$NON-NLS-1$
public static final ChildPropertyDescriptor VALUE_PROPERTY =
new ChildPropertyDescriptor(ArrayElement.class, "value", Expression.class, MANDATORY, CYCLE_RISK); //$NON-NLS-1$
/**
* A list of property descriptors (element type:
* {@link StructuralPropertyDescriptor}),
* or null if uninitialized.
*/
private static final List<StructuralPropertyDescriptor> PROPERTY_DESCRIPTORS;
static {
List<StructuralPropertyDescriptor> properyList = new ArrayList<StructuralPropertyDescriptor>(3);
properyList.add(KEY_PROPERTY);
properyList.add(VALUE_PROPERTY);
PROPERTY_DESCRIPTORS = Collections.unmodifiableList(properyList);
}
public ArrayElement(AST ast) {
super(ast);
}
public ArrayElement(int start, int end, AST ast, Expression key, Expression value) {
super(start, end, ast);
if (value == null) {
throw new IllegalArgumentException();
}
setValue(value);
if (key != null) {
setKey(key);
}
}
public ArrayElement(int start, int end, AST ast, Expression value) {
this(start, end, ast, null, value);
}
public void childrenAccept(Visitor visitor) {
if (key != null) {
key.accept(visitor);
}
value.accept(visitor);
}
public void traverseTopDown(Visitor visitor) {
accept(visitor);
if (key != null) {
key.traverseTopDown(visitor);
}
value.traverseTopDown(visitor);
}
public void traverseBottomUp(Visitor visitor) {
if (key != null) {
key.traverseBottomUp(visitor);
}
value.traverseBottomUp(visitor);
accept(visitor);
}
public void toString(StringBuffer buffer, String tab) {
buffer.append(tab).append("<ArrayElement"); //$NON-NLS-1$
appendInterval(buffer);
buffer.append(">\n"); //$NON-NLS-1$
buffer.append(TAB).append(tab).append("<Key>\n"); //$NON-NLS-1$
if (key != null) {
key.toString(buffer, TAB + TAB + tab);
buffer.append("\n"); //$NON-NLS-1$
}
buffer.append(TAB).append(tab).append("</Key>\n"); //$NON-NLS-1$
buffer.append(TAB).append(tab).append("<Value>\n"); //$NON-NLS-1$
value.toString(buffer, TAB + TAB + tab);
buffer.append("\n").append(TAB).append(tab).append("</Value>\n"); //$NON-NLS-1$ //$NON-NLS-2$
buffer.append(tab).append("</ArrayElement>"); //$NON-NLS-1$
}
public void accept0(Visitor visitor) {
final boolean visit = visitor.visit(this);
if (visit) {
childrenAccept(visitor);
}
visitor.endVisit(this);
}
public int getType() {
return ASTNode.ARRAY_ELEMENT;
}
/**
* Returns the key of this array element(null if missing).
*
* @return the key of the array element
*/
public Expression getKey() {
return key;
}
/**
* Sets the key of this array element.
*
* @param expression the left operand 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 setKey(Expression expression) {
ASTNode oldChild = this.key;
preReplaceChild(oldChild, expression, KEY_PROPERTY);
this.key = expression;
postReplaceChild(oldChild, expression, KEY_PROPERTY);
}
/**
* Returns the value expression of this array element.
*
* @return the value expression of this array element
*/
public Expression getValue() {
return this.value;
}
/**
* Sets the key of this array expression.
*
* @param expression the right operand 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 setValue(Expression expression) {
if (expression == null) {
throw new IllegalArgumentException();
}
ASTNode oldChild = this.value;
preReplaceChild(oldChild, expression, VALUE_PROPERTY);
this.value = expression;
postReplaceChild(oldChild, expression, VALUE_PROPERTY);
}
/*
* Method declared on ASTNode.
*/
public boolean subtreeMatch(ASTMatcher matcher, Object other) {
// dispatch to correct overloaded match method
return matcher.match(this, other);
}
@Override
ASTNode clone0(AST target) {
final Expression key = ASTNode.copySubtree(target, getKey());
final Expression value = ASTNode.copySubtree(target, getValue());
final ArrayElement result = new ArrayElement(this.getStart(), this.getEnd(), target, key, value);
return result;
}
@Override
List<StructuralPropertyDescriptor> internalStructuralPropertiesForType(PHPVersion apiLevel) {
return PROPERTY_DESCRIPTORS;
}
final ASTNode internalGetSetChildProperty(ChildPropertyDescriptor property, boolean get, ASTNode child) {
if (property == KEY_PROPERTY) {
if (get) {
return getKey();
} else {
setKey((Expression) child);
return null;
}
}
if (property == VALUE_PROPERTY) {
if (get) {
return getValue();
} else {
setValue((Expression) child);
return null;
}
}
// allow default implementation to flag the error
return super.internalGetSetChildProperty(property, get, child);
}
}