/*
    * ====================================================================
    * 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.http.impl.io;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.http.ConnectionClosedException;
  import org.apache.http.Consts;
  import org.apache.http.impl.SessionInputBufferMock;
  import org.apache.http.io.SessionInputBuffer;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class TestContentLengthInputStream {
  
      @Test
      public void testConstructors() throws Exception {
          final ContentLengthInputStream in = new ContentLengthInputStream(
                  new SessionInputBufferMock(new byte[] {}), 0);
          in.close();
          try {
              new ContentLengthInputStream(null, 10);
              Assert.fail("IllegalArgumentException should have been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
          try {
              new ContentLengthInputStream(new SessionInputBufferMock(new byte[] {}), -10);
              Assert.fail("IllegalArgumentException should have been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
      }
  
      @Test
      public void testBasics() throws IOException {
          final String correct = "1234567890123456";
          final InputStream in = new ContentLengthInputStream(
                  new SessionInputBufferMock(correct, Consts.ISO_8859_1), 10L);
          final ByteArrayOutputStream out = new ByteArrayOutputStream();
  
          final byte[] buffer = new byte[50];
          int len = in.read(buffer, 0, 2);
          out.write(buffer, 0, len);
          len = in.read(buffer);
          out.write(buffer, 0, len);
  
          final String result = new String(out.toByteArray(), Consts.ISO_8859_1);
          Assert.assertEquals(result, "1234567890");
          in.close();
      }
  
      @Test
      public void testSkip() throws IOException {
          InputStream in = new ContentLengthInputStream(new SessionInputBufferMock(new byte[20]), 10L);
          Assert.assertEquals(10, in.skip(10));
          Assert.assertTrue(in.read() == -1);
  
          in = new ContentLengthInputStream(new SessionInputBufferMock(new byte[20]), 10L);
          in.read();
          Assert.assertEquals(9, in.skip(10));
          Assert.assertTrue(in.read() == -1);
          in.close();
  
          in = new ContentLengthInputStream(new SessionInputBufferMock(new byte[20]), 2L);
          in.read();
          in.read();
          Assert.assertTrue(in.skip(10) <= 0);
          Assert.assertTrue(in.skip(-1) == 0);
          Assert.assertTrue(in.read() == -1);
          in.close();
  
         in = new ContentLengthInputStream(new SessionInputBufferMock(new byte[20]), 10L);
         Assert.assertEquals(5,in.skip(5));
         Assert.assertEquals(5, in.read(new byte[20]));
         in.close();
     }
 
     @Test
     public void testAvailable() throws IOException {
         final InputStream in = new ContentLengthInputStream(
                 new SessionInputBufferMock(new byte[] {1, 2, 3}), 3L);
         Assert.assertEquals(0, in.available());
         in.read();
         Assert.assertEquals(2, in.available());
         in.close();
     }
 
     @Test
     public void testClose() throws IOException {
         final String correct = "1234567890123456-";
         final SessionInputBuffer inBuffer = new SessionInputBufferMock(correct, Consts.ISO_8859_1);
         final InputStream in = new ContentLengthInputStream(inBuffer, 16L);
         in.close();
         in.close();
         try {
             in.read();
             Assert.fail("IOException should have been thrown");
         } catch (final IOException ex) {
             // expected
         }
         final byte[] tmp = new byte[10];
         try {
             in.read(tmp);
             Assert.fail("IOException should have been thrown");
         } catch (final IOException ex) {
             // expected
         }
         try {
             in.read(tmp, 0, tmp.length);
             Assert.fail("IOException should have been thrown");
         } catch (final IOException ex) {
             // expected
         }
         Assert.assertEquals('-', inBuffer.read());
     }
 
     @Test
     public void testTruncatedContent() throws IOException {
         final String correct = "1234567890123456";
         final SessionInputBuffer inBuffer = new SessionInputBufferMock(correct, Consts.ISO_8859_1);
         final InputStream in = new ContentLengthInputStream(inBuffer, 32L);
         final byte[] tmp = new byte[32];
         final int byteRead = in.read(tmp);
         Assert.assertEquals(16, byteRead);
         try {
             in.read(tmp);
             Assert.fail("ConnectionClosedException should have been closed");
         } catch (final ConnectionClosedException ex) {
         }
         try {
             in.read();
             Assert.fail("ConnectionClosedException should have been closed");
         } catch (final ConnectionClosedException ex) {
         }
         try {
             in.close();
             Assert.fail("ConnectionClosedException should have been closed");
         } catch (final ConnectionClosedException ex) {
         }
     }
 
 }