/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.nio.entity;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  
  import org.apache.http.annotation.NotThreadSafe;
  import org.apache.http.entity.AbstractHttpEntity;
  import org.apache.http.entity.ContentType;
  import org.apache.http.nio.ContentEncoder;
  import org.apache.http.nio.IOControl;
  import org.apache.http.util.Args;
  
  /**
   * A simple self contained, repeatable non-blocking entity that retrieves
   * its content from a byte array.
   *
   * @since 4.0
   */
  @SuppressWarnings("deprecation")
  @NotThreadSafe
  public class NByteArrayEntity extends AbstractHttpEntity
                                implements HttpAsyncContentProducer, ProducingNHttpEntity {
  
      private final byte[] b;
      private final int off, len;
      private final ByteBuffer buf;
      /**
       * @deprecated (4.2)
       */
      @Deprecated
      protected final byte[] content;
      /**
       * @deprecated (4.2)
       */
      @Deprecated
      protected final ByteBuffer buffer;
  
      /**
       * @since 4.2
       */
      public NByteArrayEntity(final byte[] b, final ContentType contentType) {
          super();
          Args.notNull(b, "Source byte array");
          this.b = b;
          this.off = 0;
          this.len = b.length;
          this.buf = ByteBuffer.wrap(b);
          this.content = b;
          this.buffer = this.buf;
          if (contentType != null) {
              setContentType(contentType.toString());
          }
      }
  
      /**
       * @since 4.2
       */
      public NByteArrayEntity(final byte[] b, final int off, final int len, final ContentType contentType) {
          super();
          Args.notNull(b, "Source byte array");
          if ((off < 0) || (off > b.length) || (len < 0) ||
                  ((off + len) < 0) || ((off + len) > b.length)) {
              throw new IndexOutOfBoundsException("off: " + off + " len: " + len + " b.length: " + b.length);
          }
          this.b = b;
          this.off = off;
          this.len = len;
          this.buf = ByteBuffer.wrap(b, off, len);
          this.content = b;
         this.buffer = this.buf;
         if (contentType != null) {
             setContentType(contentType.toString());
         }
     }
 
     public NByteArrayEntity(final byte[] b) {
         this(b, null);
     }
 
     public NByteArrayEntity(final byte[] b, final int off, final int len) {
         this(b, off, len, null);
     }
 
     /**
      * {@inheritDoc}
      *
      * @since 4.2
      */
     public void close() {
         this.buf.rewind();
     }
 
     /**
      * {@inheritDoc}
      *
      * @deprecated (4.2) use {@link #close()}
      */
     @Deprecated
     public void finish() {
         close();
     }
 
     public void produceContent(final ContentEncoder encoder, final IOControl ioctrl)
             throws IOException {
         encoder.write(this.buf);
         if(!this.buf.hasRemaining()) {
             encoder.complete();
         }
     }
 
     public long getContentLength() {
         return this.len;
     }
 
     public boolean isRepeatable() {
         return true;
     }
 
     public boolean isStreaming() {
         return false;
     }
 
     public InputStream getContent() {
         return new ByteArrayInputStream(this.b, this.off, this.len);
     }
 
     public void writeTo(final OutputStream outstream) throws IOException {
         Args.notNull(outstream, "Output stream");
         outstream.write(this.b, this.off, this.len);
         outstream.flush();
     }
 
 }