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/*******************************************************************************
* Copyright (c) 2004 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.wst.css.core.internal.metamodel.util;
import java.util.Iterator;
import java.util.Stack;
import org.eclipse.wst.css.core.internal.metamodel.CSSMMNode;
abstract public class CSSMetaModelTraverser {
/**
* Constructor for Traverser.
*/
public CSSMetaModelTraverser() {
super();
}
public final void apply(CSSMMNode node) {
fTravStack = new Stack();
begin(node);
traverse(node);
end(node);
}
private final short traverse(CSSMMNode node) {
if (node == null) {
return TRAV_CONT;
}
fTravStack.push(node);
short rc;
rc = preNode(node);
if (rc == TRAV_CONT) {
Iterator i = node.getChildNodes();
while (i.hasNext()) {
CSSMMNode child = (CSSMMNode) i.next();
short rcChild = traverse(child);
if (rcChild == TRAV_STOP) {
fTravStack.pop();
return TRAV_STOP;
}
}
}
else if (rc == TRAV_STOP) {
fTravStack.pop();
return TRAV_STOP;
}
rc = postNode(node);
fTravStack.pop();
return (rc == TRAV_PRUNE) ? TRAV_CONT : rc;
}
protected void begin(CSSMMNode node) {
}
protected void end(CSSMMNode node) {
}
protected short preNode(CSSMMNode node) {
return TRAV_CONT;
}
protected short postNode(CSSMMNode node) {
return TRAV_CONT;
}
Stack fTravStack = null;
protected static final short TRAV_CONT = 0;
protected static final short TRAV_STOP = 1;
protected static final short TRAV_PRUNE = 2;
}
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