DeleteModelOperation.java example

Explorer
emf.texo-master
/**
 * <copyright>
 *
 * Copyright (c) 2009, 2010, 2012 Springsite BV (The Netherlands) and others
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Martin Taal - Initial API and implementation
 *   Dzmitry [zmicer] Harachka - implementation
 * </copyright>
 *
 * $Id: DeleteModelOperation.java,v 1.8 2011/09/21 14:04:56 mtaal Exp $
 */
package org.eclipse.emf.texo.server.service;

import java.util.Collections;
import java.util.List;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.texo.provider.IdProvider;
import org.eclipse.emf.texo.server.model.request.QueryType;
import org.eclipse.emf.texo.server.model.response.ResponseModelPackage;
import org.eclipse.emf.texo.server.model.response.ResultType;
import org.eclipse.emf.texo.utils.ModelUtils;

/**
 * The model operation which takes care of deleting data.
 * 
 * The following type of request uris are supported here:
 * <ul>
 * <li>http://www.test.com/XMLService?query=select o from Order&firstResult=10&maxResults=50 a query with paging
 * parameters</li>
 * <li>http://www.test.com/XMLService?id=http://www.test.com/XMLService/Order/123 an uri with an id parameter
 * <li>http://www.test.com/XMLService/Order/123 a direct uri with a type and id</li>
 * <li>http://www.test.com/XMLService with the objects to be deleted as posted content</li>
 * </ul>
 * 
 * The response of this web service is an instance of the {@link ResultType} with the deleted
 * {@link ResultType#getDeleted()} set.
 * 
 * @author <a href="mtaal@elver.org">Martin Taal</a>
 * @version $Revision: 1.8 $
 */
public class DeleteModelOperation extends ModelOperation {

  @Override
  @SuppressWarnings("unchecked")
  protected void internalExecute() {
    final List<Object> toDelete;
    final String qryStr = (String) getServiceContext().getRequestParameters().get(ServiceConstants.PARAM_QUERY);

    // 0) a posted queryType or 1) there is a query!
    QueryType queryType = getQueryType();
    if (queryType != null) {
      toDelete = (List<Object>) getObjectStore().query(qryStr, getParameters(queryType), queryType.getFirstResult(),
          queryType.getMaxResults());
    } else if (getServiceContext().getRequestParameters().containsKey(ServiceConstants.PARAM_ID)) {
      // an id which must be a uri
      final URI uri = URI.createURI((String) getServiceContext().getRequestParameters().get(ServiceConstants.PARAM_ID));
      final Object object = getObjectStore().fromUri(uri);
      toDelete = Collections.singletonList(object);
    } else {
      final String[] segments = ServiceUtils.getSegments(getServiceContext().getServiceRequestURI());
      if (segments.length < 2) {
        // try posted content
        toDelete = getServiceContext().getRequestData();
      } else if (segments.length == 2) {
        // 3) there is specific type with an id
        final EClass eClass = ModelUtils.getEClassFromQualifiedName(segments[0]);
        final String idString = segments[1];
        final Object id = IdProvider.getInstance().convertIdStringToId(eClass, idString);
        final Object object = getObjectStore().get(eClass, id);
        toDelete = Collections.singletonList(object);
      } else {
        throw new IllegalArgumentException("Service path " + getServiceContext().getServiceRequestURI() //$NON-NLS-1$
            + " not supported, uri " + getServiceContext().getRequestURI()); //$NON-NLS-1$
      }
    }

    final ResultType result = ResponseModelPackage.INSTANCE.getModelFactory().createResultType();

    for (Object o : toDelete) {
      getObjectStore().remove(o);
      result.getDeleted().add(o);
    }

    getServiceContext().setResultInResponse(result);
  }

}