/**
    * Licensed to jclouds, Inc. (jclouds) under one or more
    * contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  jclouds licenses this file
    * to you 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.jclouds.http.internal;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  import static org.jclouds.io.Payloads.newPayload;
  
  import java.io.File;
  import java.io.InputStream;
  
  import org.jclouds.javax.annotation.Nullable;
  
  import org.jclouds.io.Payload;
  import org.jclouds.io.PayloadEnclosing;
  
  /**
   * 
   * @author Adrian Cole
   */
  public class PayloadEnclosingImpl implements PayloadEnclosing {
     protected Payload payload;
  
     public PayloadEnclosingImpl() {
        this(null);
     }
  
     public PayloadEnclosingImpl(@Nullable Payload payload) {
        this.payload = payload;
     }
  
     /**
      * {@inheritDoc}
      */
     @Override
     public Payload getPayload() {
        return payload;
     }
  
     /**
      * {@inheritDoc}
      */
     @Override
     public void setPayload(Payload data) {
        if (this.payload != null)
           payload.release();
        this.payload = checkNotNull(data, "data");
     }
  
     /**
      * {@inheritDoc}
      */
     @Override
     public void setPayload(InputStream data) {
        setPayload(newPayload(checkNotNull(data, "data")));
     }
  
     /**
      * {@inheritDoc}
      */
     @Override
     public void setPayload(byte[] data) {
        setPayload(newPayload(checkNotNull(data, "data")));
     }
  
     /**
      * {@inheritDoc}
      */
     @Override
     public void setPayload(String data) {
        setPayload(newPayload(checkNotNull(data, "data")));
     }
  
     /**
      * {@inheritDoc}
      */
     @Override
     public void setPayload(File data) {
        setPayload(newPayload(checkNotNull(data, "data")));
     }
  
     @Override
     public int hashCode() {
        final int prime = 31;
       int result = 1;
       result = prime * result + ((payload == null) ? 0 : payload.hashCode());
       return result;
    }
 
    @Override
    public boolean equals(Object obj) {
       if (this == obj)
          return true;
       if (obj == null)
          return false;
       if (getClass() != obj.getClass())
          return false;
       PayloadEnclosingImpl other = (PayloadEnclosingImpl) obj;
       if (payload == null) {
          if (other.payload != null)
             return false;
       } else if (!payload.equals(other.payload))
          return false;
       return true;
    }
 
 }