--- /dev/null
+/**
+ * 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.StringReader;
+
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestCharFilter extends LuceneTestCase {
+
+ public void testCharFilter1() throws Exception {
+ CharStream cs = new CharFilter1( CharReader.get( new StringReader("") ) );
+ assertEquals( "corrected offset is invalid", 1, cs.correctOffset( 0 ) );
+ }
+
+ public void testCharFilter2() throws Exception {
+ CharStream cs = new CharFilter2( CharReader.get( new StringReader("") ) );
+ assertEquals( "corrected offset is invalid", 2, cs.correctOffset( 0 ) );
+ }
+
+ public void testCharFilter12() throws Exception {
+ CharStream cs = new CharFilter2( new CharFilter1( CharReader.get( new StringReader("") ) ) );
+ assertEquals( "corrected offset is invalid", 3, cs.correctOffset( 0 ) );
+ }
+
+ public void testCharFilter11() throws Exception {
+ CharStream cs = new CharFilter1( new CharFilter1( CharReader.get( new StringReader("") ) ) );
+ assertEquals( "corrected offset is invalid", 2, cs.correctOffset( 0 ) );
+ }
+
+ static class CharFilter1 extends CharFilter {
+
+ protected CharFilter1(CharStream in) {
+ super(in);
+ }
+
+ @Override
+ protected int correct(int currentOff) {
+ return currentOff + 1;
+ }
+ }
+
+ static class CharFilter2 extends CharFilter {
+
+ protected CharFilter2(CharStream in) {
+ super(in);
+ }
+
+ @Override
+ protected int correct(int currentOff) {
+ return currentOff + 2;
+ }
+ }
+}