Android XML Node Child Check isDescendantOrSelf(Node ctx, Node descendantOrSelf)

Description

Returns true if the descendantOrSelf is on the descendant-or-self axis of the context node.

License

Apache License

Parameter

Parameter	Description
ctx	a parameter
descendantOrSelf	a parameter

Return

true if the node is descendant

Declaration

public static boolean isDescendantOrSelf(Node ctx, Node descendantOrSelf) 

Method Source Code

//package com.java2s;
/**/*  w  w  w .j  a v a2  s  .com*/
 * 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.
 */

import org.w3c.dom.Attr;

import org.w3c.dom.Node;

public class Main {
    /**
     * Returns true if the descendantOrSelf is on the descendant-or-self axis
     * of the context node.
     *
     * @param ctx
     * @param descendantOrSelf
     * @return true if the node is descendant
     */
    public static boolean isDescendantOrSelf(Node ctx, Node descendantOrSelf) {
        if (ctx == descendantOrSelf) {
            return true;
        }

        Node parent = descendantOrSelf;

        while (true) {
            if (parent == null) {
                return false;
            }

            if (parent == ctx) {
                return true;
            }

            if (parent.getNodeType() == Node.ATTRIBUTE_NODE) {
                parent = ((Attr) parent).getOwnerElement();
            } else {
                parent = parent.getParentNode();
            }
        }
    }
}

Related

1. hasChild(Node node, String namespace, String name)
2. hasChildElement(NodeList list)
3. hasTextContent(Node child)
4. isInstance(Node node, String namespace, String name)