/*
    * ====================================================================
    * 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.hc.client5.http.impl.cache;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.SequenceInputStream;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.util.Args;
  import org.apache.hc.core5.util.ByteArrayBuffer;
  
  class CombinedEntity implements HttpEntity {
  
      private final HttpEntity entity;
      private final InputStream combinedStream;
  
      CombinedEntity(final HttpEntity entity, final ByteArrayBuffer buf) throws IOException {
          super();
          this.entity = entity;
          this.combinedStream = new SequenceInputStream(
                  new ByteArrayInputStream(buf.array(), 0, buf.length()),
                  entity.getContent());
      }
  
      @Override
      public long getContentLength() {
          return -1;
      }
  
      @Override
      public String getContentType() {
          return entity.getContentType();
      }
  
      @Override
      public String getContentEncoding() {
          return entity.getContentEncoding();
      }
  
      @Override
      public boolean isChunked() {
          return true;
      }
  
      @Override
      public boolean isRepeatable() {
          return false;
      }
  
      @Override
      public boolean isStreaming() {
          return true;
      }
  
      @Override
      public InputStream getContent() throws IOException, IllegalStateException {
          return this.combinedStream;
      }
  
      @Override
      public Set<String> getTrailerNames() {
          return entity.getTrailerNames();
      }
  
      @Override
      public Supplier<List<? extends Header>> getTrailers() {
          return entity.getTrailers();
      }
 
     @Override
     public void writeTo(final OutputStream outStream) throws IOException {
         Args.notNull(outStream, "Output stream");
         try (InputStream inStream = getContent()) {
             int l;
             final byte[] tmp = new byte[2048];
             while ((l = inStream.read(tmp)) != -1) {
                 outStream.write(tmp, 0, l);
             }
         }
     }
 
     @Override
     public void close() throws IOException {
         try {
             combinedStream.close();
         } finally {
             entity.close();
         }
     }
 
 }