java/testing/org/apache/derbyTesting/functionTests/tests/jdbcapi/DummyReader.java

/*

   Derby - Class org.apache.derbyTesting.functionTests.tests.jdbcapi.DummyReader

   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.derbyTesting.functionTests.tests.jdbcapi;

import java.io.Reader;

public  class   DummyReader extends Reader
{
    private int _idx = 0;
    private int _readerLength;
    private static  final   String  _chars = " abcdefghijklmnopqrstuvwxyz ";
    
    public DummyReader( int readerLength )
    {
        _readerLength = readerLength;
    }

    public  void    close() {}

    public  int read( char[] buffer, int offset, int length )
    {
        if ( _idx >= _readerLength ) { return -1; }
        
        for ( int i = 0; i < length; i++ )
        {
            if ( _idx >= _readerLength )
            {
                return i;
            }
            else
            {
                buffer[ offset + i ] = value( _idx++ );
            }
        }

        return length;
    }
    private char    value( int raw )
    {
        return _chars.charAt( raw % _chars.length() );
    }

    public  String  toString()
    {
        char[]  buffer = new char[ _readerLength ];

        for ( int i = 0; i < _readerLength; i++ ) { buffer[ i ] = value( i ); }

        return new String( buffer );
    }
}