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 /*
  * 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.commons.net.io;
CRLFLineReader implements a readLine() method that requires exactly CRLF to terminate an input line. This is required for IMAP, which allows bare CR and LF.

Since:
3.0
public final class CRLFLineReader extends BufferedReader
    private static final char LF = '\n';
    private static final char CR = '\r';

    
Creates a CRLFLineReader that wraps an existing Reader input source.

Parameters:
reader The Reader input source.
    public CRLFLineReader(Reader reader)
    {
        super(reader);
    }

    
Read a line of text. A line is considered to be terminated by carriage return followed immediately by a linefeed. This contrasts with BufferedReader which also allows other combinations.

Since:
3.0
    @Override
    public String readLine() throws IOException {
        StringBuilder sb = new StringBuilder();
        int intch;
        boolean prevWasCR = false;
        synchronized() { // make thread-safe (hopefully!)
            while((intch = read()) != -1)
            {
                if (prevWasCR && intch == ) {
                    return sb.substring(0, sb.length()-1);
                }
                if (intch == ) {
                    prevWasCR = true;
                } else {
                    prevWasCR = false;
                }
                sb.append((charintch);
            }
        }
        String string = sb.toString();
        if (string.length() == 0) { // immediate EOF
            return null;
        }
        return string;
    }
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