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/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */
package org.apache.batik.dom.xbl;

import org.apache.batik.dom.AbstractNode;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * An XBL manager that performs no XBL processing.
 *
 * @author Cameron McCormack
 * @version $Id$
 */
public class GenericXBLManager implements XBLManager {

    /**
     * Whether XBL processing is currently taking place.
     */
    protected boolean isProcessing;

    /**
     * Starts XBL processing on the document.
     */
    public void startProcessing() {
        isProcessing = true;
    }

    /**
     * Stops XBL processing on the document.
     */
    public void stopProcessing() {
        isProcessing = false;
    }

    /**
     * Returns whether XBL processing is currently enabled.
     */
    public boolean isProcessing() {
        return isProcessing;
    }

    /**
     * Get the parent of a node in the fully flattened tree.
     */
    public Node getXblParentNode(Node n) {
        return n.getParentNode();
    }

    /**
     * Get the list of child nodes of a node in the fully flattened tree.
     */
    public NodeList getXblChildNodes(Node n) {
        return n.getChildNodes();
    }

    /**
     * Get the list of child nodes of a node in the fully flattened tree
     * that are within the same shadow scope.
     */
    public NodeList getXblScopedChildNodes(Node n) {
        return n.getChildNodes();
    }

    /**
     * Get the first child node of a node in the fully flattened tree.
     */
    public Node getXblFirstChild(Node n) {
        return n.getFirstChild();
    }

    /**
     * Get the last child node of a node in the fully flattened tree.
     */
    public Node getXblLastChild(Node n) {
        return n.getLastChild();
    }

    /**
     * Get the node which directly precedes a node in the xblParentNode's
     * xblChildNodes list.
     */
    public Node getXblPreviousSibling(Node n) {
        return n.getPreviousSibling();
    }

    /**
     * Get the node which directly follows a node in thexblParentNode's
     * xblChildNodes list.
     */
    public Node getXblNextSibling(Node n) {
        return n.getNextSibling();
    }

    /**
     * Get the first element child of a node in the fully flattened tree.
     */
    public Element getXblFirstElementChild(Node n) {
        Node m = n.getFirstChild();
        while (m != null && m.getNodeType() != Node.ELEMENT_NODE) {
            m = m.getNextSibling();
        }
        return (Element) m;
    }

    /**
     * Get the last element child of a node in the fully flattened tree.
     */
    public Element getXblLastElementChild(Node n) {
        Node m = n.getLastChild();
        while (m != null && m.getNodeType() != Node.ELEMENT_NODE) {
            m = m.getPreviousSibling();
        }
        return (Element) m;
    }

    /**
     * Get the first element that precedes the a node in the
     * xblParentNode's xblChildNodes list.
     */
    public Element getXblPreviousElementSibling(Node n) {
        Node m = n;
        do {
            m = m.getPreviousSibling();
        } while (m != null && m.getNodeType() != Node.ELEMENT_NODE);
        return (Element) m;
    }

    /**
     * Get the first element that follows a node in the
     * xblParentNode's xblChildNodes list.
     */
    public Element getXblNextElementSibling(Node n) {
        Node m = n;
        do {
            m = m.getNextSibling();
        } while (m != null && m.getNodeType() != Node.ELEMENT_NODE);
        return (Element) m;
    }

    /**
     * Get the bound element whose shadow tree a node resides in.
     */
    public Element getXblBoundElement(Node n) {
        return null;
    }

    /**
     * Get the shadow tree of a node.
     */
    public Element getXblShadowTree(Node n) {
        return null;
    }

    /**
     * Get the xbl:definition elements currently binding an element.
     */
    public NodeList getXblDefinitions(Node n) {
        return AbstractNode.EMPTY_NODE_LIST;
    }
}