Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright 2008 - 2009 Pro-Netics S.P.A.
 *
 *    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.util.ArrayList;
import java.util.List;

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

public class Main {
    /**
     * Gets a list of nodes that matches the given attribute name and attribute value
     * @param attrName the given attribute name
     * @param attrValue the given attribute value
     * @param node the node under which search must be performed
     * @return List of nodes that matches the given attribute properties
     */
    public static List<Node> getNodesByAttributeValue(Node node, String attrName, String attrValue) {
        List<Node> list = new ArrayList<Node>();

        NodeList nodeList = node.getChildNodes();
        if (nodeList != null) {
            Node child;
            for (int i = 0; i < nodeList.getLength(); i++) {
                child = nodeList.item(i);
                if (nodeAttributeMatches(child, attrName, attrValue)) {
                    list.add(child);
                }
            }
        }

        return list;
    }

    /**
     * Check whether the given nodes containes an attribute with the given name and value.<br>
     * The "matching" is assumed to be true even if the attribute just starts or ends with the given
     * attribute value.<br>
     * This has been allowed to match multiple keyword attributes such as in 
     * <code>class="hfeed hentry"</code> cases.<br>
     * 
     * @param node node to be analyzed
     * @param attrName the attribute name to be matched
     * @param attrValue the attribute value to be matched
     * @return <code>true</code> if node containes the given attributes, <code>false</code> otherwise (even if node is null)
     */
    public static boolean nodeAttributeMatches(Node node, String attrName, String attrValue) {

        if (node != null && node.getNodeType() == Node.ELEMENT_NODE) {

            String value = ((Element) node).getAttribute(attrName);
            return (value != null && value.length() > 0 && attributeValueMatches(value, attrValue));

        } else {

            return false;

        }
    }

    public static boolean attributeValueMatches(String value, String expectedValue) {

        try { // attribute value is longer than the expected one, it may be a composite one (ie: hfeed hentry)
            if (value.length() > expectedValue.length()) {
                return ((value.startsWith(expectedValue) && value.charAt(expectedValue.length()) == ' ')
                        || (value.endsWith(expectedValue)
                                && value.charAt(value.length() - expectedValue.length() - 1) == ' '));
            } else {
                return (value.equalsIgnoreCase(expectedValue));
            }
        } catch (NullPointerException npe) {
            return false;
        }

    }
}