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Modules for converting JDOM documents to Metafacture streams and vice versa

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/*
 * Copyright 2013, 2014 Deutsche Nationalbibliothek
 *
 * 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.
 */

package org.metafacture.jdom;

import org.metafacture.framework.FluxCommand;
import org.metafacture.framework.ObjectPipe;
import org.metafacture.framework.StreamReceiver;
import org.metafacture.framework.XmlPipe;
import org.metafacture.framework.annotations.In;
import org.metafacture.framework.annotations.Out;

import org.jdom2.Document;
import org.jdom2.JDOMException;
import org.jdom2.output.SAXOutputter;

/**
 * Converts a {@link Document} to a stream.
 *
 * @author Markus Geipel
 */
@In(Document.class)
@Out(StreamReceiver.class)
@FluxCommand("from-jdom-document")
public final class JDomDocumentToStream
        implements ObjectPipe {

    private final SAXOutputter saxOutputer;
    private final XmlPipe xmlPipe;

    /**
     * Contructs a JDomDocumentToStream with a given XmlPipe.
     *
     * @param xmlPipe the XmlPipe of type StreamReceiver
     */
    public JDomDocumentToStream(final XmlPipe xmlPipe) {
        this.xmlPipe = xmlPipe;
        saxOutputer = new SAXOutputter(xmlPipe);
    }

    @Override
    public void process(final Document document) {
        assert null != document;
        try {
            saxOutputer.output(document);
        }
        catch (final JDOMException e) {
            throw new IllegalArgumentException("Invalid JDOM document", e);
        }
    }

    @Override
    public void resetStream() {
        xmlPipe.resetStream();
    }

    @Override
    public void closeStream() {
        xmlPipe.closeStream();

    }

    @Override
    public  R setReceiver(final R receiver) {
        return xmlPipe.setReceiver(receiver);
    }

}