Android Open Source - lightbox-android-webservices Delete Operation

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright (c) 2012 Lightbox/*  w  w  w. ja v  a  2s. c  o m*/
 *
 * 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 com.lightbox.android.operations;

import java.util.List;

import com.lightbox.android.utils.debug.DebugLog;
import com.lightbox.android.webservices.requests.ApiRequest;

/** 
 * DeleteOperation 
 * @author Fabien Devos
 */
public class DeleteOperation<T> extends AbstractOperation<T> {
  /** Used to tag logs */
  // @SuppressWarnings("unused")
  private static final String TAG = "DeleteOperation";
  
  private T mData;
  
  //----------------------------------------------
  // Constructor
  
  /**
   * Constructor.
   * @param dataAction
   * @param apiRequest
   */
  public DeleteOperation(T data, Class<T> dataClass, ApiRequest apiRequest) {
    super(dataClass, apiRequest);
    
    mData = data;
  }
  
  //----------------------------------------------
  // Getter
  
  protected T getData() {
    return mData;
  }
  
  //----------------------------------------------
  // Operation
  
  @Override
  public List<T> executeLocalOperationSync() throws Exception {
    // Mark the object as deleted in the database
    if (mData instanceof Updatable) {
      Updatable updatable = (Updatable) mData;
      updatable.markAsLocallyDeleted();
      getDao().update(mData);
    }
    return wrapInList(mData);
  }
  
  @Override
  public List<T> executeServerOperationSync() throws Exception {
    getApiRequest().execute();
    // At this point if there is no exception, the object should be deleted on the server side
    
    // Finally delete the data from the database
    getDao().delete(mData);
    return wrapInList(mData);
  }
  
  @Override
  public final List<T> executeSync() throws Exception {    
    List<T> resultList;
    
    // Mark the object as deleted in the database
    resultList = executeLocalOperationSync();
    
    // Try to update on the server
    try {
      resultList = executeServerOperationSync();
      
    } catch (Exception e) {
      DebugLog.d(TAG, "Failed to delete data on the server: %s", e);
      
      // We must wait for the next synchronization
    }

    // Return the deleted object
    return resultList;
  }

}

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