/**
    * Copyright 2005-2016 The Kuali Foundation
    *
    * 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.rice.edl.impl.xml.export;
  
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.core.api.impex.ExportDataSet;
  import org.kuali.rice.edl.impl.bo.EDocLiteAssociation;
  import org.kuali.rice.krad.bo.Exporter;
  import org.kuali.rice.krad.exception.ExportNotSupportedException;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * An implementation of the {@link Exporter} class which facilitates exporting
   * of EDocLite data from the GUI.
   * 
   * @see ExportDataSet
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class EdlDataExporter implements Exporter {
  
  	private List<String> supportedFormats = new ArrayList<String>();
  
  	public EdlDataExporter() {
  		supportedFormats.add(KRADConstants.XML_FORMAT);
  	}
  
  	@Override
  	public List<String> getSupportedFormats(Class<?> dataObjectClass) {
  		return supportedFormats;
  	}
  
  	/**
  	 * Builds the ExportDataSet based on the BusinessObjects passed in.
  	 */
  	protected ExportDataSet buildExportDataSet(Class<?> dataObjectClass, List<? extends Object> dataObjects) {
  		EdlExportDataSet dataSet = new EdlExportDataSet();
  		for (Object dataObject : dataObjects) {
  			if (dataObjectClass.equals(EDocLiteAssociation.class)) {
  				dataSet.getEdocLites().add((EDocLiteAssociation)dataObject);
  			}   
  		}
  
  		return  dataSet.createExportDataSet();
  	}
  
  	/**
  	 * This overridden method ...
  	 * 
  	 * @see org.kuali.rice.krad.bo.Exporter#export(java.lang.Class, java.util.List, java.lang.String, java.io.OutputStream)
  	 */
  	@Override
  	public void export(Class<?> dataObjectClass, List<? extends Object> dataObjects, String exportFormat, OutputStream outputStream) throws IOException,
  			ExportNotSupportedException {
  		if (!KRADConstants.XML_FORMAT.equals(exportFormat)) {
  			throw new ExportNotSupportedException("The given export format of " + exportFormat + " is not supported by the EDocLite XML Exporter!");
  		}
  		ExportDataSet dataSet = buildExportDataSet(dataObjectClass, dataObjects);
  		outputStream.write(CoreApiServiceLocator.getXmlExporterService().export(dataSet));
  		outputStream.flush();
  		
  	}
  }