/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.mapping.xml;
/**
* This visitor walks the Mapping node top/down or bottom/up and lets the supplied
* visitor visit the nodes at each stage.
*/
public class Navigator extends MappingVisitor {
private MappingVisitor realVisitor;
protected boolean preOrder = true;
public Navigator(boolean preOrder, MappingVisitor visitor) {
this.preOrder = preOrder;
this.realVisitor = visitor;
}
public void visit(MappingNode node) {
if (preOrder) {
node.acceptVisitor(realVisitor);
}
walkChildNodes(node);
if (!preOrder) {
node.acceptVisitor(realVisitor);
}
}
/**
* @see org.teiid.query.mapping.xml.MappingVisitor#visit(org.teiid.query.mapping.xml.MappingElement)
*/
public void visit(MappingElement element) {
if (preOrder) {
element.acceptVisitor(realVisitor);
}
// attributes
walkAttributes(element);
// walk the children
walkChildNodes(element);
if (!preOrder) {
element.acceptVisitor(realVisitor);
}
}
/**
* @see org.teiid.query.mapping.xml.MappingVisitor#visit(org.teiid.query.mapping.xml.MappingRecursiveElement)
*/
public void visit(MappingRecursiveElement element) {
this.realVisitor.visit(element);
// Do not walk the children of the recursive class as they are
// of its own kind which has been already been walked.
}
/**
* @see org.teiid.query.mapping.xml.MappingVisitor#shouldAbort()
*/
protected boolean shouldAbort() {
return super.shouldAbort() || realVisitor.shouldAbort();
}
}