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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
   
   
package com.gemstone.gemfire.internal.admin.remote;

import com.gemstone.gemfire.*;
import com.gemstone.gemfire.cache.*;
//import com.gemstone.gemfire.internal.*;
import com.gemstone.gemfire.internal.admin.*;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
import com.gemstone.gemfire.distributed.internal.*;
import java.io.*;
//import java.util.*;
import com.gemstone.gemfire.distributed.internal.membership.*;

/**
 * Responds to {@link RegionResponse}.
 * @since 3.5
 */
public final class RegionResponse extends AdminResponse {
//   instance variables

  /** The name of the region returned in the response. */
  private String name;

  /** The user attribute for the region */
  private String userAttribute;

  /** An exception that occurred while generating this response */
  private Exception exception;

  ///////////////////////  Static Methods  ///////////////////////
  
  /**
   * Returns a RegionResponse that will be returned to the
   * specified recipient. The message will contains a copy of the local manager's
   * system config.
   */
  public static RegionResponse create(DistributionManager dm,
                                      InternalDistributedMember recipient,
                                      RegionRequest request) {
    RegionResponse m = new RegionResponse();

    try {
      Cache cache = CacheFactory.getInstance(dm.getSystem());

      int cacheId = request.cacheId;
      if (System.identityHashCode(cache) == cacheId) {
        Region r;
        int action = request.action;
        switch (action) {
        case RegionRequest.GET_REGION:
          r = cache.getRegion(request.path);
          break;

        case RegionRequest.CREATE_VM_ROOT:
          r = cache.createRegion(request.newRegionName,
                                 request.newRegionAttributes);
          break;

        case RegionRequest.CREATE_VM_REGION:
          Region parent = cache.getRegion(request.path);
          r = parent.createSubregion(request.newRegionName,
                                     request.newRegionAttributes); 
          break;

        default:
          throw new InternalGemFireException(LocalizedStrings.RegionResponse_UNKNOWN_REGIONREQUEST_OPERATION_0.toLocalizedString(Integer.valueOf(action)));
        }

        if (r != null) {
          m.name = r.getFullPath();
          m.userAttribute = (String)CacheDisplay.getCachedObjectDisplay(r.getUserAttribute(), GemFireVM.LIGHTWEIGHT_CACHE_VALUE);

        } else {
          m.name = null;
        }
      }
    } 
    catch (CancelException cce){
      /*no cache yet*/

    } catch (Exception ex) {
      // Something went wrong while creating the region
      m.exception = ex;
    }
    m.setRecipient(recipient);    
    return m;
  }
  
  // instance methods
  
  public Region getRegion(RemoteGemFireVM vm) {
    if (this.name == null) {
      return null;
    } else {
      return new AdminRegion(this.name, vm, this.userAttribute);
    }
  }
  
  /**
   * Returns any exception that was thrown while generating this
   * response.
   */
  public Exception getException() {
    return this.exception;
  }

  public int getDSFID() {
    return REGION_RESPONSE;
  }

  @Override
  public void toData(DataOutput out) throws IOException {
    super.toData(out);
    DataSerializer.writeString(this.name, out);
    DataSerializer.writeString(this.userAttribute, out);
    DataSerializer.writeObject(this.exception, out);
  }

  @Override
  public void fromData(DataInput in)
    throws IOException, ClassNotFoundException {
    super.fromData(in);
    this.name = DataSerializer.readString(in);
    this.userAttribute = DataSerializer.readString(in);
    this.exception = (Exception) DataSerializer.readObject(in);
  }

  @Override
  public String toString() {
    return "RegionResponse from " + this.getRecipient();
  }
}