/**
 * This file Copyright (c) 2012 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */
package info.magnolia.jcr.node2bean.impl;
 
import javax.inject.Singleton;
import javax.jcr.Node;
 
import org.apache.commons.collections.ArrayStack;
 
import info.magnolia.jcr.node2bean.TypeDescriptor;
import info.magnolia.jcr.node2bean.TransformationState;
 
/**
 * Transformation state implementation. Contains stacks of info for the types, beans and the content.
 */
@Singleton
public class TransformationStateImpl implements TransformationState {
 
    protected ArrayStack typeStack = new ArrayStack();
 
    protected ArrayStack beanStack = new ArrayStack();
 
    protected ArrayStack nodeStack = new ArrayStack();
 
    @Override
    public Object getCurrentBean() {
        return beanStack.peek();
    }
 
    @Override
    public void setCurrentBean(Object bean) {
        beanStack.set(beanStack.size() - 1, bean);
    }
 
    @Override
    public TypeDescriptor getCurrentType() {
        return (TypeDescriptor) typeStack.peek();
    }
 
    @Override
    public Node getCurrentNode() {
        return (Node) nodeStack.peek();
    }
 
    @Override
    public Object peekBean(int pos) {
        return beanStack.peek(pos);
    }
 
    @Override
    public TypeDescriptor peekType(int pos) {
        return (TypeDescriptor) typeStack.peek(pos);
    }
 
    @Override
    public Node peekNode(int pos) {
        return (Node) nodeStack.peek(pos);
    }
 
    @Override
    public void popBean() {
        beanStack.pop();
    }
 
    @Override
    public void popType() {
        typeStack.pop();
    }
 
    @Override
    public void popNode() {
        nodeStack.pop();
    }
 
    @Override
    public void pushBean(Object bean) {
        beanStack.push(bean);
    }
 
    @Override
    public void pushType(TypeDescriptor type) {
        typeStack.push(type);
    }
 
    @Override
    public void pushNode(Node node) {
        nodeStack.push(node);
    }
 
    @Override
    public int getLevel() {
        return Math.max(Math.max(typeStack.size(), beanStack.size()), nodeStack.size());
    }
}