/*
    * ====================================================================
    * 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.impl;
  
  import java.util.Collections;
  import java.util.Set;
  
  import org.apache.hc.core5.annotation.Internal;
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpHeaders;
  import org.apache.hc.core5.http.MessageHeaders;
  import org.apache.hc.core5.http.message.MessageSupport;
  import org.apache.hc.core5.util.Args;
  
  /**
   * HTTP message entity details.
   *
   * @since 5.0
   */
  @Internal
  public class IncomingEntityDetails implements EntityDetails {
  
      private final MessageHeaders message;
      private final long contentLength;
  
      public IncomingEntityDetails(final MessageHeaders message, final long contentLength) {
          this.message = Args.notNull(message, "Message");
          this.contentLength = contentLength;
      }
  
      public IncomingEntityDetails(final MessageHeaders message) {
          this(message, -1);
      }
  
      @Override
      public long getContentLength() {
          return contentLength;
      }
  
      @Override
      public String getContentType() {
          final Header h = message.getFirstHeader(HttpHeaders.CONTENT_TYPE);
          return h != null ? h.getValue() : null;
      }
  
      @Override
      public String getContentEncoding() {
          final Header h = message.getFirstHeader(HttpHeaders.CONTENT_ENCODING);
          return h != null ? h.getValue() : null;
      }
  
      @Override
      public boolean isChunked() {
          return contentLength < 0;
      }
  
      @Override
      public Set<String> getTrailerNames() {
          final Header h = message.getFirstHeader(HttpHeaders.TRAILER);
          if (h == null) {
              return Collections.emptySet();
          }
          return MessageSupport.parseTokens(h);
      }
  
  }