org.opencastproject.composer.api.EncodingProfileBuilder.java Source code

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Here is the source code for org.opencastproject.composer.api.EncodingProfileBuilder.java

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/**
 *  Copyright 2009, 2010 The Regents of the University of California
 *  Licensed under the Educational Community 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.osedu.org/licenses/ECL-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.opencastproject.composer.api;

import org.apache.commons.io.IOUtils;

import java.io.InputStream;
import java.io.StringWriter;
import java.io.Writer;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.stream.StreamSource;

/**
 * Provides a mechanism to transform {@link EncodingProfile}s to and from xml.
 */
public final class EncodingProfileBuilder {

    /** The singleton instance for this factory */
    private static EncodingProfileBuilder instance = null;

    protected JAXBContext jaxbContext = null;

    private EncodingProfileBuilder() throws JAXBException {
        StringBuilder sb = new StringBuilder();
        sb.append("org.opencastproject.composer.api");
        jaxbContext = JAXBContext.newInstance(sb.toString(), EncodingProfileBuilder.class.getClassLoader());
    }

    /**
     * Returns an instance of the {@link EncodingProfileBuilder}.
     * 
     * @return a factory
     */
    public static EncodingProfileBuilder getInstance() {
        if (instance == null) {
            try {
                instance = new EncodingProfileBuilder();
            } catch (JAXBException e) {
                throw new IllegalStateException(e.getLinkedException() != null ? e.getLinkedException() : e);
            }
        }
        return instance;
    }

    /**
     * Loads an encoding profile from the given input stream.
     * 
     * @param in
     *          the input stream
     * @return the encoding profile
     * @throws Exception
     *           if creating the profile fails
     */
    public EncodingProfile parseProfile(InputStream in) throws Exception {
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        try {
            return unmarshaller.unmarshal(new StreamSource(in), EncodingProfileImpl.class).getValue();
        } finally {
            IOUtils.closeQuietly(in);
        }
    }

    /**
     * Loads an encoding profile from the xml fragement.
     * 
     * @param in
     *          xml stream of the profile
     * @return the profile
     * @throws Exception
     *           if creating the profile fails
     */
    public EncodingProfile parseProfile(String in) throws Exception {
        InputStream is = null;
        try {
            is = IOUtils.toInputStream(in, "UTF-8");
            return parseProfile(is);
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    /**
     * Loads an encoding profile list from the given input stream.
     * 
     * @param in
     *          the input stream
     * @return the encoding profile list
     * @throws Exception
     *           if creating the profile list fails
     */
    public EncodingProfileList parseProfileList(InputStream in) throws Exception {
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        try {
            return unmarshaller.unmarshal(new StreamSource(in), EncodingProfileList.class).getValue();
        } finally {
            IOUtils.closeQuietly(in);
        }
    }

    /**
     * Loads an encoding profile from the xml stream.
     * 
     * @param in
     *          xml stream of the profile list
     * @return the profile list
     * @throws Exception
     *           if creating the profile list fails
     */
    public EncodingProfileList parseProfileList(String in) throws Exception {
        InputStream is = null;
        try {
            is = IOUtils.toInputStream(in, "UTF-8");
            return parseProfileList(is);
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

    /**
     * Serializes a profile to xml.
     * 
     * @param profile
     *          the profile to serialize
     * @return the xml fragment
     * @throws Exception
     */
    public String toXml(EncodingProfile profile) throws Exception {
        Marshaller marshaller = jaxbContext.createMarshaller();
        Writer writer = new StringWriter();
        marshaller.marshal(profile, writer);
        return writer.toString();
    }

    /**
     * Serializes a profile list to xml.
     * 
     * @param profileList
     *          the profile list to serialize
     * @return the xml fragment
     * @throws Exception
     */
    public String toXml(EncodingProfileList profileList) throws Exception {
        Marshaller marshaller = jaxbContext.createMarshaller();
        Writer writer = new StringWriter();
        marshaller.marshal(profileList, writer);
        return writer.toString();
    }

}