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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 * | |
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* specific language governing permissions and limitations * | |
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****************************************************************/ | |
package org.apache.james.mime4j.io; | |
import java.io.FilterInputStream; | |
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. | |
*/ | |
public class LineNumberInputStream extends FilterInputStream implements | |
LineNumberSource { | |
private int lineNumber = 1; | |
/** | |
* Creates a new <code>LineNumberInputStream</code>. | |
* | |
* @param is | |
* the stream to read from. | |
*/ | |
public LineNumberInputStream(InputStream is) { | |
super(is); | |
} | |
public int getLineNumber() { | |
return lineNumber; | |
} | |
@Override | |
public int read() throws IOException { | |
int b = in.read(); | |
if (b == '\n') { | |
lineNumber++; | |
} | |
return b; | |
} | |
@Override | |
public int read(byte[] b, int off, int len) throws IOException { | |
int n = in.read(b, off, len); | |
for (int i = off; i < off + n; i++) { | |
if (b[i] == '\n') { | |
lineNumber++; | |
} | |
} | |
return n; | |
} | |
} |