Parses the given input stream as XML and returns the corresponding DOM document. - Java XML

Java examples for XML:DOM Document

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Description

Parses the given input stream as XML and returns the corresponding DOM document.

Demo Code

/*/*from   w w  w. j  a  v a2  s  . com*/
 * Copyright (c) 2009, IETR/INSA of Rennes
 * Copyright (c) 2012, Synflow
 * 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 the IETR/INSA of Rennes 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 java.io.ByteArrayInputStream;

import java.io.InputStream;

import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;

import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSInput;

import org.w3c.dom.ls.LSParser;

public class Main {
    private static DOMImplementation impl;
    private static DOMImplementationRegistry registry;

    /**
     * Parses the given input stream as XML and returns the corresponding DOM document.
     * 
     * @param is
     *            an input stream
     * @return a DOM document
     */
    public static Document parseDocument(InputStream is) {
        getImplementation();
        DOMImplementationLS implLS = (DOMImplementationLS) impl;

        // create input
        LSInput input = implLS.createLSInput();
        input.setByteStream(is);

        // parse without comments and whitespace
        LSParser builder = implLS.createLSParser(
                DOMImplementationLS.MODE_SYNCHRONOUS, null);
        DOMConfiguration config = builder.getDomConfig();
        config.setParameter("comments", false);
        config.setParameter("element-content-whitespace", false);

        return builder.parse(input);
    }

    /**
     * Parses the given String as XML and returns the corresponding DOM document. The String is
     * converted to an input stream so that encoding is taken into account (otherwise if we pass a
     * String to an LSInput DOM will ignore the encoding and assume UTF-16).
     * 
     * @param str
     *            a String
     * @return a DOM document
     */
    public static Document parseDocument(String str) {
        return parseDocument(new ByteArrayInputStream(str.getBytes()));
    }

    /**
     * Creates a new instance of the DOM registry and get an implementation of DOM 3 with Load Save
     * objects.
     */
    private static void getImplementation() {
        try {
            if (registry == null) {
                registry = DOMImplementationRegistry.newInstance();
            }

            if (impl == null) {
                impl = registry.getDOMImplementation("Core 3.0 XML 3.0 LS");
                if (impl == null) {
                    throw new RuntimeException(
                            "no DOM 3 implementation found");
                }
            }
        } catch (ClassNotFoundException e) {
            throw new RuntimeException("DOM error", e);
        } catch (InstantiationException e) {
            throw new RuntimeException("DOM error", e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException("DOM error", e);
        }
    }
}

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