Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 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.Node;

public class Main {
    /**
     * Returns the long hash code for the content in the passed node
     * @param node the node to compute the long hash code for 
     * @return the long hash code
     */
    public static long longHashCode(final Node node) {
        final String s = getNodeTextValue(node);
        return longHashCode(s);
    }

    /**
     * Pretty crap long hashcode algo. FIXME
     * @param s The string to get the long hash code for
     * @return the long has code
     */
    public static long longHashCode(String s) {
        long h = 0;
        int len = s.length();
        int off = 0;
        int hashPrime = s.hashCode();
        char val[] = s.toCharArray();
        for (int i = 0; i < len; i++) {
            h = (31 * h + val[off++] + (hashPrime * h));
        }
        return h;
    }

    /**
     * Returns the text inside the passed XML node.
     * @param node The node to extract from
     * @param defaultValue The default value if no text is found
     * @return the extracted text
     */
    public static String getNodeTextValue(final Node node, final String defaultValue) {
        try {
            String s = node.getFirstChild().getNodeValue();
            return s == null ? defaultValue : s;
        } catch (Exception ex) {
            return defaultValue;
        }
    }

    /**
     * Returns the text inside the passed XML node.
     * @param node The node to extract from
     * @return the extracted text or null if no text was found
     */
    public static String getNodeTextValue(final Node node) {
        return getNodeTextValue(node, null);
    }
}