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/*
* Copyright 2000-2004 Apache Software Foundation
*
* Licensed 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.tools.ant.taskdefs;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
/**
* Logs each line written to this stream to the log system of ant.
*
* Tries to be smart about line separators.<br>
* TODO: This class can be split to implement other line based processing
* of data written to the stream.
*
* @author thomas.haas@softwired-inc.com
* @since Ant 1.2
*/
public class LogOutputStream extends OutputStream {
/** Initial buffer size. */
private static final int INTIAL_SIZE = 132;
/** Carriage return */
private static final int CR = 0x0d;
/** Linefeed */
private static final int LF = 0x0a;
private ByteArrayOutputStream buffer
= new ByteArrayOutputStream(INTIAL_SIZE);
private boolean skip = false;
private Task task;
private int level = Project.MSG_INFO;
/**
* Creates a new instance of this class.
*
* @param task the task for whom to log
* @param level loglevel used to log data written to this stream.
*/
public LogOutputStream(Task task, int level) {
this.task = task;
this.level = level;
}
/**
* Write the data to the buffer and flush the buffer, if a line
* separator is detected.
*
* @param cc data to log (byte).
*/
public void write(int cc) throws IOException {
final byte c = (byte) cc;
if ((c == '\n') || (c == '\r')) {
if (!skip) {
processBuffer();
}
} else {
buffer.write(cc);
}
skip = (c == '\r');
}
/**
* Flush this log stream
*/
public void flush() {
processBuffer();
}
/**
* Converts the buffer to a string and sends it to <code>processLine</code>
*/
protected void processBuffer() {
processLine(buffer.toString());
buffer.reset();
}
/**
* Logs a line to the log system of ant.
*
* @param line the line to log.
*/
protected void processLine(String line) {
processLine(line, level);
}
/**
* Logs a line to the log system of ant.
*
* @param line the line to log.
*/
protected void processLine(String line, int level) {
task.log(line, level);
}
/**
* Writes all remaining
*/
public void close() throws IOException {
if (buffer.size() > 0) {
processBuffer();
}
super.close();
}
public int getMessageLevel() {
return level;
}
/**
* Write a block of characters to the output stream
*
* @param b the array containing the data
* @param off the offset into the array where data starts
* @param len the length of block
*
* @throws IOException if the data cannot be written into the stream.
*/
public void write(byte[] b, int off, int len) throws IOException {
// find the line breaks and pass other chars through in blocks
int offset = off;
int blockStartOffset = offset;
int remaining = len;
while (remaining > 0) {
while (remaining > 0 && b[offset] != LF && b[offset] != CR) {
offset++;
remaining--;
}
// either end of buffer or a line separator char
int blockLength = offset - blockStartOffset;
if (blockLength > 0) {
buffer.write(b, blockStartOffset, blockLength);
}
while (remaining > 0 && (b[offset] == LF || b[offset] == CR)) {
write(b[offset]);
offset++;
remaining--;
}
blockStartOffset = offset;
}
}
}
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