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Google API Client Library for Java. Supports Java 5 (or higher) desktop (SE) and web (EE), Android, and Google App Engine.

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/*
 * Copyright (c) 2010 Google Inc.
 *
 * 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 com.google.api.client.javanet;

import com.google.api.client.http.HttpResponse;
import com.google.api.client.http.LowLevelHttpResponse;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

final class NetHttpResponse extends LowLevelHttpResponse {

  private final HttpURLConnection connection;
  private final int responseCode;
  private final String responseMessage;
  private final ArrayList headerNames = new ArrayList();
  private final ArrayList headerValues = new ArrayList();

  NetHttpResponse(HttpURLConnection connection) throws IOException {
    this.connection = connection;
    responseCode = connection.getResponseCode();
    responseMessage = connection.getResponseMessage();
    List headerNames = this.headerNames;
    List headerValues = this.headerValues;
    for (Map.Entry> entry : connection.getHeaderFields().entrySet()) {
      String key = entry.getKey();
      if (key != null) {
        for (String value : entry.getValue()) {
          if (value != null) {
            headerNames.add(key);
            headerValues.add(value);
          }
        }
      }
    }
  }

  @Override
  public int getStatusCode() {
    return responseCode;
  }

  @Override
  public InputStream getContent() throws IOException {
    HttpURLConnection connection = this.connection;
    return HttpResponse.isSuccessStatusCode(responseCode)
        ? connection.getInputStream() : connection.getErrorStream();
  }

  @Override
  public String getContentEncoding() {
    return connection.getContentEncoding();
  }

  @Override
  public long getContentLength() {
    String string = connection.getHeaderField("Content-Length");
    return string == null ? -1 : Long.parseLong(string);
  }

  @Override
  public String getContentType() {
    return connection.getHeaderField("Content-Type");
  }

  @Override
  public String getReasonPhrase() {
    return responseMessage;
  }

  @Override
  public String getStatusLine() {
    String result = connection.getHeaderField(0);
    return result != null && result.startsWith("HTTP/1.") ? result : null;
  }

  @Override
  public int getHeaderCount() {
    return headerNames.size();
  }

  @Override
  public String getHeaderName(int index) {
    return headerNames.get(index);
  }

  @Override
  public String getHeaderValue(int index) {
    return headerValues.get(index);
  }
}