/**
 *        CloudGraph Community Edition (CE) License
 * 
 * This is a community release of CloudGraph, a dual-license suite of
 * Service Data Object (SDO) 2.1 services designed for relational and 
 * big-table style "cloud" databases, such as HBase and others. 
 * This particular copy of the software is released under the 
 * version 2 of the GNU General Public License. CloudGraph was developed by 
 * TerraMeta Software, Inc.
 * 
 * Copyright (c) 2013, TerraMeta Software, Inc. All rights reserved.
 * 
 * General License information can be found below.
 * 
 * This distribution may include materials developed by third
 * parties. For license and attribution notices for these
 * materials, please refer to the documentation that accompanies
 * this distribution (see the "Licenses for Third-Party Components"
 * appendix) or view the online documentation at 
 * <http://cloudgraph.org/licenses/>. 
 */
package org.cloudgraph.config;

import java.io.InputStream;
import java.io.OutputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.UnmarshalException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.plasma.common.bind.BindingValidationEventHandler;
import org.plasma.common.bind.DataBinding;
import org.plasma.common.bind.ValidatingUnmarshaler;
import org.xml.sax.SAXException;

/**
 * Configuration JAXB Binding delegate. 
 * @author Scott Cinnamond
 * @since 0.5
 */
public class CloudGraphConfigDataBinding implements DataBinding {

    private static Log log = LogFactory.getLog(CloudGraphConfigDataBinding.class);
    public static String FILENAME_SCHEMA_CHAIN_ROOT = "cloudgraph-config.xsd";

    // just classes in the same package where can find the above respective
    // schema files via Class.getResource*
    public static Class<?> RESOURCE_CLASS = CloudGraphConfigDataBinding.class;

    private ValidatingUnmarshaler validatingUnmarshaler;

    public static Class<?>[] FACTORIES = { org.cloudgraph.config.ObjectFactory.class, };

    @SuppressWarnings("unused")
    private CloudGraphConfigDataBinding() {
    }

    public CloudGraphConfigDataBinding(BindingValidationEventHandler validationEventHandler)
            throws JAXBException, SAXException {
        log.debug("loading schema chain...");
        InputStream stream = RESOURCE_CLASS.getResourceAsStream(FILENAME_SCHEMA_CHAIN_ROOT);
        if (stream == null)
            stream = RESOURCE_CLASS.getClassLoader().getResourceAsStream(FILENAME_SCHEMA_CHAIN_ROOT);
        if (stream == null)
            throw new CloudGraphConfigurationException("could not find configuration file schema resource '" 
                    + FILENAME_SCHEMA_CHAIN_ROOT 
                    + "' on the current classpath");        
        validatingUnmarshaler = new ValidatingUnmarshaler( 
        		stream, JAXBContext.newInstance(FACTORIES),
                validationEventHandler);
    }

    public Class<?>[] getObjectFactories() {
        return FACTORIES;
    }

    public String marshal(Object root) throws JAXBException {
        return validatingUnmarshaler.marshal(root);
    }

    public void marshal(Object root, OutputStream stream) throws JAXBException {
        validatingUnmarshaler.marshal(root, stream);
    }
    
    public Object unmarshal(String xml) throws JAXBException {
        return validatingUnmarshaler.unmarshal(xml);
    }

    public Object unmarshal(InputStream stream) throws JAXBException {
        return validatingUnmarshaler.unmarshal(stream);
    }

    public Object validate(String xml) throws JAXBException {
        return validatingUnmarshaler.validate(xml);
    }

    public Object validate(InputStream xml) throws JAXBException, UnmarshalException {
        return validatingUnmarshaler.validate(xml);
    }

    public BindingValidationEventHandler getValidationEventHandler() throws JAXBException {
        return this.validatingUnmarshaler.getValidationEventHandler();
    }

}