| /**************************************************************** |
| * 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.james.mime4j.mboxiterator; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.Charset; |
| |
| /** |
| * Wraps a CharBuffer and exposes some convenience methods to easy parse with Mime4j. |
| */ |
| public class CharBufferWrapper { |
| |
| private final CharBuffer messageBuffer; |
| |
| public CharBufferWrapper(CharBuffer messageBuffer) { |
| if (messageBuffer == null) { |
| throw new IllegalStateException("The buffer is null"); |
| } |
| this.messageBuffer = messageBuffer; |
| } |
| |
| public InputStream asInputStream(Charset encoding) { |
| return new ByteBufferInputStream(encoding.encode(messageBuffer)); |
| } |
| |
| public char[] asCharArray() { |
| return messageBuffer.array(); |
| } |
| |
| @Override |
| public String toString() { |
| return messageBuffer.toString(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (!(o instanceof CharBufferWrapper)) return false; |
| |
| CharBufferWrapper that = (CharBufferWrapper) o; |
| |
| if (!messageBuffer.equals(that.messageBuffer)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return messageBuffer.hashCode(); |
| } |
| |
| /** |
| * Provide an InputStream view over a ByteBuffer. |
| */ |
| private static class ByteBufferInputStream extends InputStream { |
| |
| private final ByteBuffer buf; |
| |
| private ByteBufferInputStream(ByteBuffer buf) { |
| this.buf = buf; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| if (!buf.hasRemaining()) { |
| return -1; |
| } |
| return buf.get() & 0xFF; |
| } |
| |
| @Override |
| public int read(byte[] bytes, int off, int len) throws IOException { |
| if (bytes == null) throw new NullPointerException("bytes is null"); |
| if (off < 0) throw new IndexOutOfBoundsException("read index negative: " + off); |
| if (len < 0) throw new IndexOutOfBoundsException("read length negative: " + len); |
| |
| if (len > (bytes.length - off)) { |
| throw new IndexOutOfBoundsException( |
| "read would write invalid array index: array size: " + |
| bytes.length + |
| ", array index: " + |
| off + |
| ", requested size: " + |
| len |
| ); |
| } |
| |
| if (!buf.hasRemaining()) { |
| return -1; |
| } |
| |
| int actualAmount = Math.min(len, buf.remaining()); |
| buf.get(bytes, off, actualAmount); |
| |
| return actualAmount; |
| } |
| |
| } |
| } |