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/**
 * Copyright 2017 TerraMeta Software, Inc.
 * 
 * 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.plasma.provisioning;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;

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;

public class MetamodelDataBinding implements DataBinding {

  private static Log log = LogFactory.getLog(MetamodelDataBinding.class);
  public static String FILENAME_SCHEMA_CHAIN_ROOT = "metamodel.xsd";

  // just classes in the same package where can find the above respective
  // schema files via Class.getResource*
  public static java.lang.Class RESOURCE_CLASS = org.plasma.metamodel.ObjectFactory.class;

  private static ValidatingUnmarshaler validatingUnmarshaler;

  public static java.lang.Class[] FACTORIES = { org.plasma.metamodel.ObjectFactory.class };

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

  public MetamodelDataBinding(BindingValidationEventHandler validationEventHandler)
      throws JAXBException, SAXException {
    if (validatingUnmarshaler == null) {
      log.info("loading schema chain...");
      URL url = RESOURCE_CLASS.getResource(FILENAME_SCHEMA_CHAIN_ROOT);
      if (url == null)
        url = RESOURCE_CLASS.getClassLoader().getResource(FILENAME_SCHEMA_CHAIN_ROOT);
      if (url == null)
        throw new IllegalArgumentException("could not find schema root file ;"
            + FILENAME_SCHEMA_CHAIN_ROOT + "' on classpath");
      validatingUnmarshaler = new ValidatingUnmarshaler(url, JAXBContext.newInstance(FACTORIES),
          validationEventHandler);
    }
  }

  public java.lang.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 void marshal(Object root, OutputStream stream, boolean formattedOutput)
      throws JAXBException {
    validatingUnmarshaler.marshal(root, stream, formattedOutput);
  }

  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 validatingUnmarshaler.getValidationEventHandler();
  }

}