/*
    * 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.
   */
  package org.apache.maven.shared.filtering;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.io.StringReader;
  
  import org.junit.Test;
  
  public class BoundedReaderTest
  {
  
      private final Reader sr = new BufferedReader( new StringReader( "01234567890" ) );
  
      @Test
      public void readTillEnd()
          throws IOException
      {
          try ( BoundedReader mr = new BoundedReader( sr, 3 ) )
          {
              mr.mark( 3 );
              mr.read();
              mr.read();
              mr.read();
              assertEquals( -1, mr.read() );
          }
      }
  
      @Test
      public void readMulti()
          throws IOException
      {
          char[] cbuf = new char[4];
          for ( int i = 0; i < cbuf.length; i++ )
          {
              cbuf[i] = 'X';
          }
  
          try ( BoundedReader mr = new BoundedReader( sr, 3 ) ) 
          {
              final int read = mr.read( cbuf, 0, 4 );
              assertEquals( 3, read );
          }
  
          assertEquals( '0', cbuf[0] );
          assertEquals( '1', cbuf[1] );
          assertEquals( '2', cbuf[2] );
          assertEquals( 'X', cbuf[3] );
      }
  
      @Test
      public void readMultiWithOffset()
          throws IOException
      {
          
          char[] cbuf = new char[4];
          for ( int i = 0; i < cbuf.length; i++ ) 
          {
              cbuf[i] = 'X';
          }
          
          try ( BoundedReader mr = new BoundedReader( sr, 3 ) ) 
          {
              final int read = mr.read( cbuf, 1, 2 );
              assertEquals( 2, read );
          }
          
          assertEquals( 'X', cbuf[0] );
          assertEquals( '0', cbuf[1] );
          assertEquals( '1', cbuf[2] );
          assertEquals( 'X', cbuf[3] );
      }
  
      @Test
      public void resetWorks()
          throws IOException
      {
          try ( BoundedReader mr = new BoundedReader( sr, 3 ) )
          {
             mr.read();
             mr.read();
             mr.read();
             mr.reset();
             mr.read();
             mr.read();
             mr.read();
             assertEquals( -1, mr.read() );
         }
     }
 
     @Test
     public void skipTest()
         throws IOException
     {
         try (BoundedReader mr = new BoundedReader( sr, 3 ) )
         {
             mr.skip( 2 );
             mr.read();
             assertEquals( -1, mr.read() );
         }
     }
 }