Helper function for quickly retrieving a String value of a given XML element. - Android XML

Android examples for XML:XML Element

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Description

Helper function for quickly retrieving a String value of a given XML element.

Demo Code

/*//from w  w w . j  a v a2 s .  c  om
 * Copyright (c) 2007-2011, Arshan Dabirsiaghi, Jason Li
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 * Neither the name of OWASP nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
//package com.java2s;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern encgt = Pattern.compile(">");
    private static final Pattern enclt = Pattern.compile("<");
    private static final Pattern encQuot = Pattern.compile(""");
    private static final Pattern encAmp = Pattern.compile("&");

    /**
     * Helper function for quickly retrieving a String value of a given
     * XML element.
     * @param ele The document element from which to pull the String value.
     * @param tagName The name of the node.
     * @return The String value of the given node in the element passed in.
     */
    public static String getTextValue(Element ele, String tagName) {
        String textVal = null;
        NodeList nl = ele.getElementsByTagName(tagName);
        if (nl != null && nl.getLength() > 0) {
            Element el = (Element) nl.item(0);
            if (el.getFirstChild() != null) {
                textVal = el.getFirstChild().getNodeValue();
            } else {
                textVal = "";
            }
        }
        return decode(textVal);
    }

    /**
     * Helper function for decode XML entities.
     *
     * @param str The XML-encoded String to decode.
     * @return An XML-decoded String.
     */
    public static String decode(String str) {

        if (str == null) {
            return null;
        }

        Matcher gtmatcher = encgt.matcher(str);
        if (gtmatcher.matches()) {
            str = gtmatcher.replaceAll(">");
        }
        Matcher ltmatcher = enclt.matcher(str);
        if (ltmatcher.matches()) {
            str = ltmatcher.replaceAll("<");
        }
        Matcher quotMatcher = encQuot.matcher(str);
        if (quotMatcher.matches()) {
            str = quotMatcher.replaceAll("\"");
        }
        Matcher ampMatcher = encAmp.matcher(str);
        if (ampMatcher.matches()) {
            str = ampMatcher.replaceAll("&");
        }

        return str;
    }
}

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