Gets the character data corresponding to the given DOM element as a Double, or null if the value is not a double. - Java XML

Java examples for XML:XML Element Value

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Description

Gets the character data corresponding to the given DOM element as a Double, or null if the value is not a double.

Demo Code

/*//from w  ww .j  av a 2  s.  c  o m
 * ome.xml.DOMUtil
 *
 *-----------------------------------------------------------------------------
 *
 *  Copyright (C) 2007-2008 Open Microscopy Environment
 *      Massachusetts Institute of Technology,
 *      National Institutes of Health,
 *      University of Dundee,
 *      University of Wisconsin-Madison
 *
 *
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation; either
 *    version 2.1 of the License, or (at your option) any later version.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public
 *    License along with this library; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *-----------------------------------------------------------------------------
 */
//package com.java2s;

import org.w3c.dom.*;

public class Main {
    /**
     * Gets the character data corresponding to the given DOM element as
     * a Double, or null if the value is not a double.
     */
    public static Double getDoubleCharacterData(Element el) {
        return stringToDouble(getCharacterData(el));
    }

    private static Double stringToDouble(String value) {
        if (value == null)
            return null;
        try {
            return new Double(value);
        } catch (NumberFormatException exc) {
            return null;
        }
    }

    /** Gets the character data corresponding to the given DOM element. */
    public static String getCharacterData(Element el) {
        Text text = getChildTextNode(el);
        return text == null ? null : text.getData();
    }

    /**
     * Gets the child text node containing character data
     * for the given DOM element.
     */
    public static Text getChildTextNode(Element el) {
        if (el == null)
            return null;
        NodeList list = el.getChildNodes();
        int size = list.getLength();
        for (int i = 0; i < size; i++) {
            Node node = list.item(i);
            if (!(node instanceof Text))
                continue;
            return (Text) node;
        }
        return null;
    }
}

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