Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2007 - 2012 the original author or authors.
 *
 * 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.io.IOException;
import java.io.StringReader;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class Main {
    /**
     * Parses a XML document.
     * 
     * @param xml the XML document
     * @return DOM
     */
    public static Document parse(String xml) throws ParserConfigurationException, SAXException, IOException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setNamespaceAware(true);
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(new InputSource(new StringReader(xml)));
        removeWhitespaces((Element) document.getChildNodes().item(0));
        return document;
    }

    private static void removeWhitespaces(Element element) {
        NodeList children = element.getChildNodes();
        for (int i = 0; i < children.getLength();) {
            Node n = children.item(i);
            if (n instanceof Element) {
                removeWhitespaces((Element) n);
                ++i;
            } else if (n instanceof Text && ((Text) n).getTextContent().trim().length() == 0) {
                element.removeChild(n);
            } else {
                ++i;
            }
        }
    }
}