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/*
 * Copyright (c) 2009-2015
 * 	IT-Consulting Stephan Schloepke (http://www.schloepke.de/)
 * 	klemm software consulting Mirko Klemm (http://www.klemm-scs.com/)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jbasics.codec;

import org.jbasics.exception.DelegatedException;
import org.jbasics.pattern.coder.Codec;
import org.jbasics.pattern.factory.Factory;
import org.jbasics.xml.transform.XMLTransformerFactory;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.StringReader;
import java.io.StringWriter;

/**
 * A {@link Codec} implementing the parsing of a string into a DOM {@link Document} and vise versa. Use this code in
 * places where a coded is required and you want to decode a XML string into a DOM {@link Document}.
 *
 * @author Stephan Schloepke
 * @since 1.0
 */
public class DOMDocumentCodec implements Codec {
	/**
	 * The shared instance of the coded with the default {@link XMLTransformerFactory#SHARED_INSTANCE}
	 *
	 * @since 1.0
	 */
	public static final DOMDocumentCodec SHARED_INSTANCE = new DOMDocumentCodec();

	private final Factory transformerFactory;

	/**
	 * Creates the {@link DOMDocumentCodec} with the default {@link XMLTransformerFactory}.
	 *
	 * @since 1.0
	 */
	public DOMDocumentCodec() {
		this(null);
	}

	/**
	 * Creates the {@link DOMDocumentCodec} with the given {@link Transformer} {@link Factory} or using the default
	 * {@link XMLTransformerFactory} if null.
	 *
	 * @param transformerFactory The transformer factory to use or {@link XMLTransformerFactory} as default if null.
	 */
	public DOMDocumentCodec(final Factory transformerFactory) {
		this.transformerFactory = transformerFactory != null ? transformerFactory : XMLTransformerFactory.SHARED_INSTANCE;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.jbasics.pattern.coder.Decoder#decode(java.lang.Object)
	 */
	@Override
	public Document decode(final String encodedInput) {
		try {
			final DocumentBuilderFactory fac = DocumentBuilderFactory.newInstance();
			fac.setNamespaceAware(true);
			DocumentBuilder builder;
			builder = fac.newDocumentBuilder();
			return builder.parse(new InputSource(new StringReader(encodedInput)));
		} catch (final Exception e) {
			throw DelegatedException.delegate(e);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.jbasics.pattern.coder.Encoder#encode(java.lang.Object)
	 */
	@Override
	public String encode(final Document input) {
		try {
			final StringWriter w = new StringWriter();
			this.transformerFactory.newInstance().transform(new DOMSource(input), new StreamResult(w));
			return w.toString();
		} catch (final TransformerException e) {
			throw DelegatedException.delegate(e);
		}
	}
}