/*
    * ====================================================================
    * 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.core5.http.io.entity;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.Collections;
  import java.util.List;
  import java.util.Set;
  
  import org.apache.hc.core5.function.Supplier;
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.util.Args;
  
  /**
   * Abstract base class for mutable entities. Provides the commonly used attributes for streamed and
   * self-contained implementations.
   *
   * @since 4.0
   */
  public abstract class AbstractHttpEntity implements HttpEntity {
  
      static final int OUTPUT_BUFFER_SIZE = 4096;
  
      private final String contentType;
      private final String contentEncoding;
      private final boolean chunked;
  
      protected AbstractHttpEntity(final String contentType, final String contentEncoding, final boolean chunked) {
          this.contentType = contentType;
          this.contentEncoding = contentEncoding;
          this.chunked = chunked;
      }
  
      protected AbstractHttpEntity(final ContentType contentType, final String contentEncoding, final boolean chunked) {
          this.contentType = contentType != null ? contentType.toString() : null;
          this.contentEncoding = contentEncoding;
          this.chunked = chunked;
      }
  
      protected AbstractHttpEntity(final String contentType, final String contentEncoding) {
          this(contentType, contentEncoding, false);
      }
  
      protected AbstractHttpEntity(final ContentType contentType, final String contentEncoding) {
          this(contentType, contentEncoding, false);
      }
  
      public static void writeTo(final HttpEntity entity, final OutputStream outStream) throws IOException {
          Args.notNull(entity, "Entity");
          Args.notNull(outStream, "Output stream");
          try (final InputStream inStream = entity.getContent()) {
              if (inStream != null) {
                  int count;
                  final byte[] tmp = new byte[OUTPUT_BUFFER_SIZE];
                  while ((count = inStream.read(tmp)) != -1) {
                      outStream.write(tmp, 0, count);
                  }
              }
          }
      }
  
      @Override
      public void writeTo(final OutputStream outStream) throws IOException {
          writeTo(this, outStream);
      }
  
      @Override
      public final String getContentType() {
          return contentType;
      }
 
     @Override
     public final String getContentEncoding() {
         return contentEncoding;
     }
 
     @Override
     public final boolean isChunked() {
         return chunked;
     }
 
     @Override
     public boolean isRepeatable() {
         return false;
     }
 
     @Override
     public Supplier<List<? extends Header>> getTrailers() {
         return null;
     }
 
     @Override
     public Set<String> getTrailerNames() {
         return Collections.emptySet();
     }
 
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder();
         sb.append("[Entity-Class: ");
         sb.append(getClass().getSimpleName());
         sb.append(", Content-Type: ");
         sb.append(contentType);
         sb.append(", Content-Encoding: ");
         sb.append(contentEncoding);
         sb.append(", chunked: ");
         sb.append(chunked);
         sb.append(']');
         return sb.toString();
     }
 
 }