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    1   /**
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   
   18   package org.apache.lucene.analysis;
   19   
   20   import java.io.IOException;
   21   import java.io.Reader;
   22   
   23   /**
   24    * CharReader is a Reader wrapper. It reads chars from
   25    * Reader and outputs {@link CharStream}, defining an
   26    * identify function {@link #correctOffset} method that
   27    * simply returns the provided offset.
   28    */
   29   public final class CharReader extends CharStream {
   30   
   31     protected Reader input;
   32     
   33     public static CharStream get(Reader input) {
   34       return input instanceof CharStream ?
   35         (CharStream)input : new CharReader(input);
   36     }
   37   
   38     private CharReader(Reader in) {
   39       input = in;
   40     }
   41   
   42     @Override
   43     public int correctOffset(int currentOff) {
   44       return currentOff;
   45     }
   46   
   47     @Override
   48     public void close() throws IOException {
   49       input.close();
   50     }
   51   
   52     @Override
   53     public int read(char[] cbuf, int off, int len) throws IOException {
   54       return input.read(cbuf, off, len);
   55     }
   56   
   57     @Override
   58     public boolean markSupported(){
   59       return input.markSupported();
   60     }
   61   
   62     @Override
   63     public void mark( int readAheadLimit ) throws IOException {
   64       input.mark(readAheadLimit);
   65     }
   66   
   67     @Override
   68     public void reset() throws IOException {
   69       input.reset();
   70     }
   71   }

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