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A complete, Java-based solution for accessing, manipulating, and outputting XML data
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/*--

 Copyright (C) 2011 Jason Hunter & Brett McLaughlin.
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions, and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer that follows
    these conditions in the documentation and/or other materials
    provided with the distribution.

 3. The name "JDOM" must not be used to endorse or promote products
    derived from this software without prior written permission.  For
    written permission, please contact .

 4. Products derived from this software may not be called "JDOM", nor
    may "JDOM" appear in their name, without prior written permission
    from the JDOM Project Management .

 In addition, we request (but do not require) that you include in the
 end-user documentation provided with the redistribution and/or in the
 software itself an acknowledgement equivalent to the following:
     "This product includes software developed by the
      JDOM Project (http://www.jdom.org/)."
 Alternatively, the acknowledgment may be graphical using the logos
 available at http://www.jdom.org/images/logos.

 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 JDOM AUTHORS OR THE PROJECT
 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.

 This software consists of voluntary contributions made by many
 individuals on behalf of the JDOM Project and was originally
 created by Jason Hunter  and
 Brett McLaughlin .  For more information
 on the JDOM Project, please see .

 */

package org.jdom2.input.sax;

import javax.xml.XMLConstants;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

import org.jdom2.JDOMException;

/**
 * An enumeration of {@link XMLReaderJDOMFactory} that allows for a single
 * central location to create XMLReaders. The Singletons (members) of this
 * enumeration can produce the most common XMLReaders: non-validating, XSD
 * validating, and DocType validating.
 * 
 * See the {@link org.jdom2.input.sax package documentation} for details of how
 * to create the SAXParser you desire.
 * 
 * @see org.jdom2.input.sax
 * @author Rolf Lear
 */
public enum XMLReaders implements XMLReaderJDOMFactory {

	/**
	 * The non-validating singleton
	 */
	NONVALIDATING(0),

	/**
	 * The DTD-validating Singleton
	 */
	DTDVALIDATING(1),

	/**
	 * The XSD-validating Singleton
	 */
	XSDVALIDATING(2);

	/** the actual SAXParserFactory in the respective singletons. */
	private final SAXParserFactory jaxpfactory;
	/** Is this a validating parser */
	private final boolean validates;

	/** Private constructor */
	private XMLReaders(int validate) {
		SAXParserFactory fac = SAXParserFactory.newInstance();
		boolean val = false;
		// All JDOM parsers are namespace aware.
		fac.setNamespaceAware(true);
		switch (validate) {
			case 0:
				fac.setValidating(false);
				break;
			case 1:
				fac.setValidating(true);
				val = true;
				break;
			case 2:
				fac.setValidating(false);
				try {
					SchemaFactory sfac = SchemaFactory.
							newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
					Schema schema = sfac.newSchema();
					fac.setSchema(schema);
					val = true;
				} catch (SAXException se) {
					// we could not get a validating system, set the fac to null
					fac = null;
				} catch (IllegalArgumentException iae) {
					// this system does not support XSD Validation.... which is true for android!
					// we could not get a validating system, set the fac to null
					fac = null;
				}
				break;
		}
		jaxpfactory = fac;
		validates = val;
	}

	/**
	 * Get a new XMLReader from this JAXP-based {@link XMLReaderJDOMFactory}.
	 * 
	 * 
	 * @return a new XMLReader instance.
	 * @throws JDOMException
	 *         if there is a problem creating the XMLReader
	 */
	@Override
	public XMLReader createXMLReader() throws JDOMException {
		if (jaxpfactory == null) {
			throw new JDOMException("It was not possible to configure a " +
					"suitable XMLReader to support " + this);
		}
		try {
			return jaxpfactory.newSAXParser().getXMLReader();
		} catch (SAXException e) {
			throw new JDOMException(
					"Unable to create a new XMLReader instance", e);
		} catch (ParserConfigurationException e) {
			throw new JDOMException(
					"Unable to create a new XMLReader instance", e);
		}
	}

	@Override
	public boolean isValidating() {
		return validates;
	}

}