/*
 * 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.lucene.analysis;


import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;

import org.apache.lucene.util.LuceneTestCase;

public class TestCharFilter extends LuceneTestCase {

  public void testCharFilter1() throws Exception {
    CharFilter cs = new CharFilter1(new StringReader(""));
    assertEquals("corrected offset is invalid", 1, cs.correctOffset(0));
  }

  public void testCharFilter2() throws Exception {
    CharFilter cs = new CharFilter2(new StringReader(""));
    assertEquals("corrected offset is invalid", 2, cs.correctOffset(0));
  }

  public void testCharFilter12() throws Exception {
    CharFilter cs = new CharFilter2(new CharFilter1(new StringReader("")));
    assertEquals( "corrected offset is invalid", 3, cs.correctOffset(0));
  }

  public void testCharFilter11() throws Exception {
    CharFilter cs = new CharFilter1(new CharFilter1(new StringReader("")));
    assertEquals( "corrected offset is invalid", 2, cs.correctOffset(0));
  }

  static class CharFilter1 extends CharFilter {

    protected CharFilter1(Reader in) {
      super(in);
    }

    @Override
    public int read(char[] cbuf, int off, int len) throws IOException {
      return input.read(cbuf, off, len);
    }

    @Override
    protected int correct(int currentOff) {
      return currentOff + 1;
    }
  }

  static class CharFilter2 extends CharFilter {

    protected CharFilter2(Reader in) {
      super(in);
    }
    
    @Override
    public int read(char[] cbuf, int off, int len) throws IOException {
      return input.read(cbuf, off, len);
    }

    @Override
    protected int correct(int currentOff) {
      return currentOff + 2;
    }
  }
}