util4jaxpparser.java

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/**
 * Copyright 2003-2008 陈乜云（非也,Chen Nieyun）
 * All rights reserved. 
 * 
 * This program 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。
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see http://www.gnu.org/licenses. *
 */
package org.fireflow.model.io;

import java.net.MalformedURLException;
import java.net.URL;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 *
 * @author chennieyun
 */
public class Util4JAXPParser {
    /**
     * Return the first child element with the given name,The elements must be in
     the same name space as the parent element.
     * @param element
     * @param name
     * @return
     */
    public static Element child(Element element, String name) {
        NodeList nodeList = element.getElementsByTagNameNS(element.getNamespaceURI(),name);
        if (nodeList!=null && nodeList.getLength()>0){
            return (Element)nodeList.item(0);
        }
        return null;
    }

    /** Return the child elements with the given name.  The elements must be in
     the same name space as the parent element.
     @param element The parent element
     @param name The child element name
     @return The child elements
     */
    public static List<Element> children(Element element, String name) {
        NodeList nodeList = element.getElementsByTagNameNS(element.getNamespaceURI(),name);
        List result = new ArrayList();
        for (int i=0;nodeList!=null && i<nodeList.getLength();i++){
            result.add(nodeList.item(i));
        }
        return result;
    }

    // Conversion

    /** Return the value of the child element with the given name.  The element
     must be in the same name space as the parent element.

     @param element The parent element
     @param name The child element name
     @return The child element value
     */
    public static String elementAsString(Element element, String name) {
        Element child = child(element, name);
        if (child!=null){
            return child.getTextContent();
        }else{
            return null;
        }
    }

    public static Date elementAsDate(Element element, String name) throws
        FPDLParserException {
        String text = elementAsString(element, name);
        if (text == null) {
            return null;
        }

        try {
            return DateUtilities.getInstance().parse(text);
            //return STANDARD_DF.parse(text);
        } catch (ParseException e) {
            throw new FPDLParserException("Error parsing date: " + text, e);
        }
    }

    public static int elementAsInteger(Element element, String name) {
        String text = elementAsString(element, name);
        if (text == null) {
            return 0;
        }

        return Integer.parseInt(text);
    }

    public static boolean elementAsBoolean(Element element, String name) {
        String text = elementAsString(element, name);
        if (text == null) {
            return false;
        }

        return new Boolean(text).booleanValue();
    }

    public static URL elementAsURL(Element element, String name) throws
        FPDLParserException {
        String text = elementAsString(element, name);
        if (text == null) {
            return null;
        }

        try {
            return new URL(text);
        } catch (MalformedURLException e) {
            throw new FPDLParserException("Invalid URL: " + text, e);
        }
    }

}