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Commons Net example source code file (CRLFLineReader.java)
The Commons Net CRLFLineReader.java source code/* * 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; import java.io.BufferedReader; import java.io.IOException; import java.io.Reader; /** * 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. * @param 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(lock) { // make thread-safe (hopefully!) while((intch = read()) != -1) { if (prevWasCR && intch == LF) { return sb.substring(0, sb.length()-1); } if (intch == CR) { prevWasCR = true; } else { prevWasCR = false; } sb.append((char) intch); } } String string = sb.toString(); if (string.length() == 0) { // immediate EOF return null; } return string; } } Other Commons Net examples (source code examples)Here is a short list of links related to this Commons Net CRLFLineReader.java source code file: |
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