/**************************************************************** | |
* 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.stream; | |
import java.io.IOException; | |
import java.io.InputStream; | |
/** | |
* <code>InputStream</code> used by the parser to wrap the original user | |
* supplied stream. This stream keeps track of the current line number and | |
* can also be truncated. When truncated the stream will appear to have | |
* reached end of file. This is used by the parser's | |
* {@link org.apache.james.mime4j.parser.MimeStreamParser#stop()} method. | |
* | |
* | |
* @version $Id: RootInputStream.java,v 1.2 2004/10/02 12:41:10 ntherning Exp $ | |
*/ | |
public class RootInputStream extends InputStream { | |
private InputStream is = null; | |
private int lineNumber = 1; | |
private int prev = -1; | |
private boolean truncated = false; | |
/** | |
* Creates a new <code>RootInputStream</code>. | |
* | |
* @param in the stream to read from. | |
*/ | |
public RootInputStream(InputStream is) { | |
this.is = is; | |
} | |
/** | |
* Gets the current line number starting at 1 | |
* (the number of <code>\r\n</code> read so far plus 1). | |
* | |
* @return the current line number. | |
*/ | |
public int getLineNumber() { | |
return lineNumber; | |
} | |
/** | |
* Truncates this <code>InputStream</code>. After this call any | |
* call to {@link #read()}, {@link #read(byte[])} or | |
* {@link #read(byte[], int, int)} will return | |
* -1 as if end-of-file had been reached. | |
*/ | |
public void truncate() { | |
this.truncated = true; | |
} | |
/** | |
* @see java.io.InputStream#read() | |
*/ | |
public int read() throws IOException { | |
if (truncated) { | |
return -1; | |
} | |
int b = is.read(); | |
if (prev == '\r' && b == '\n') { | |
lineNumber++; | |
} | |
prev = b; | |
return b; | |
} | |
/** | |
* | |
* @see java.io.InputStream#read(byte[], int, int) | |
*/ | |
public int read(byte[] b, int off, int len) throws IOException { | |
if (truncated) { | |
return -1; | |
} | |
int n = is.read(b, off, len); | |
for (int i = off; i < off + n; i++) { | |
if (prev == '\r' && b[i] == '\n') { | |
lineNumber++; | |
} | |
prev = b[i]; | |
} | |
return n; | |
} | |
} |