Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright 2012 Geoscience Australia
 * 
 * Licensed 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 java.lang.reflect.Array;

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

public class Main {
    /**
     * Get all child nodes of parent that implement/subclass the given type.
     * 
     * @param parent
     *            Parent to search
     * @param nodeType
     *            Type of child to search for
     * @return Array of children of parent that conform to the given nodeType
     */
    public static <N extends Node> N[] getChildrenImplementing(Node parent, Class<N> nodeType) {
        if (parent == null) {
            return null;
        }
        NodeList children = parent.getChildNodes();
        if (children == null) {
            return null;
        }
        int count = 0;
        for (int i = 0; i < children.getLength(); i++) {
            Node node = children.item(i);
            if (nodeType.isAssignableFrom(node.getClass())) {
                count++;
            }
        }
        @SuppressWarnings("unchecked")
        N[] array = (N[]) Array.newInstance(nodeType, count);
        for (int i = 0, pos = 0; i < children.getLength(); i++) {
            Node node = children.item(i);
            if (nodeType.isAssignableFrom(node.getClass())) {
                @SuppressWarnings("unchecked")
                N n = (N) node;
                Array.set(array, pos++, n);
            }
        }
        return array;
    }
}