/*
    * Copyright 2002-2014 the original author or authors.
    *
    * Licensed 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.springframework.http.client;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.HttpURLConnection;
  
  import org.springframework.http.HttpHeaders;
  import org.springframework.util.StringUtils;
  
  /**
   * {@link ClientHttpResponse} implementation that uses standard JDK facilities.
   * Obtained via {@link SimpleBufferingClientHttpRequest#execute()} and
   * {@link SimpleStreamingClientHttpRequest#execute()}.
   *
   * @author Arjen Poutsma
   * @since 3.0
   */
  final class SimpleClientHttpResponse extends AbstractClientHttpResponse {
  
  	private final HttpURLConnection connection;
  
  	private HttpHeaders headers;
  
  
  	SimpleClientHttpResponse(HttpURLConnection connection) {
  		this.connection = connection;
  	}
  
  
  	@Override
  	public int getRawStatusCode() throws IOException {
  		return this.connection.getResponseCode();
  	}
  
  	@Override
  	public String getStatusText() throws IOException {
  		return this.connection.getResponseMessage();
  	}
  
  	@Override
  	public HttpHeaders getHeaders() {
  		if (this.headers == null) {
  			this.headers = new HttpHeaders();
  			// Header field 0 is the status line for most HttpURLConnections, but not on GAE
  			String name = this.connection.getHeaderFieldKey(0);
  			if (StringUtils.hasLength(name)) {
  				this.headers.add(name, this.connection.getHeaderField(0));
  			}
  			int i = 1;
  			while (true) {
  				name = this.connection.getHeaderFieldKey(i);
  				if (!StringUtils.hasLength(name)) {
  					break;
  				}
  				this.headers.add(name, this.connection.getHeaderField(i));
  				i++;
  			}
  		}
  		return this.headers;
  	}
  
  	@Override
  	public InputStream getBody() throws IOException {
  		InputStream errorStream = this.connection.getErrorStream();
  		return (errorStream != null ? errorStream : this.connection.getInputStream());
  	}
  
  	@Override
  	public void close() {
  		this.connection.disconnect();
  	}
  
  }