001/**************************************************************** 002 * Licensed to the Apache Software Foundation (ASF) under one * 003 * or more contributor license agreements. See the NOTICE file * 004 * distributed with this work for additional information * 005 * regarding copyright ownership. The ASF licenses this file * 006 * to you under the Apache License, Version 2.0 (the * 007 * "License"); you may not use this file except in compliance * 008 * with the License. You may obtain a copy of the License at * 009 * * 010 * http://www.apache.org/licenses/LICENSE-2.0 * 011 * * 012 * Unless required by applicable law or agreed to in writing, * 013 * software distributed under the License is distributed on an * 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 015 * KIND, either express or implied. See the License for the * 016 * specific language governing permissions and limitations * 017 * under the License. * 018 ****************************************************************/ 019 020package org.apache.james.mpt.helper; 021 022import java.io.IOException; 023import java.io.InputStream; 024import java.nio.ByteBuffer; 025import java.nio.CharBuffer; 026import java.nio.charset.Charset; 027import java.nio.charset.CharsetEncoder; 028 029 030public class ByteBufferInputStream extends InputStream { 031 private final ByteBuffer buffer = ByteBuffer.allocate(160384); 032 033 private final CharsetEncoder encoder = Charset.forName("ASCII").newEncoder(); 034 035 private boolean readLast = true; 036 037 public int read() throws IOException { 038 if (!readLast) { 039 readLast = true; 040 buffer.flip(); 041 } 042 int result = -1; 043 if (buffer.hasRemaining()) { 044 result = buffer.get(); 045 } 046 return result; 047 } 048 049 public void nextLine(String line) { 050 if (buffer.position() > 0 && readLast) { 051 buffer.compact(); 052 } 053 encoder.encode(CharBuffer.wrap(line), buffer, true); 054 buffer.put((byte) '\r'); 055 buffer.put((byte) '\n'); 056 readLast = false; 057 } 058}