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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 KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.util;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.Task;
/**
* Special <code>InputStream</code> that will
* concatenate the contents of an array of files.
*/
public class ConcatFileInputStream extends InputStream {
private static final int EOF = -1;
private int currentIndex = -1;
private boolean eof = false;
private File[] file;
private InputStream currentStream;
private ProjectComponent managingPc;
/**
* Construct a new <code>ConcatFileInputStream</code>
* with the specified <code>File[]</code>.
* @param file <code>File[]</code>.
* @throws IOException if I/O errors occur.
*/
public ConcatFileInputStream(File[] file) throws IOException {
this.file = file;
}
/**
* Close the stream.
* @throws IOException if there is an error.
*/
public void close() throws IOException {
closeCurrent();
eof = true;
}
/**
* Read a byte.
* @return the byte (0 - 255) or -1 if this is the end of the stream.
* @throws IOException if there is an error.
*/
public int read() throws IOException {
int result = readCurrent();
if (result == EOF && !eof) {
openFile(++currentIndex);
result = readCurrent();
}
return result;
}
/**
* Set a managing <code>Task</code> for
* this <code>ConcatFileInputStream</code>.
* @param task the managing <code>Task</code>.
*/
public void setManagingTask(Task task) {
setManagingComponent(task);
}
/**
* Set a managing <code>Task</code> for
* this <code>ConcatFileInputStream</code>.
* @param pc the managing <code>Task</code>.
*/
public void setManagingComponent(ProjectComponent pc) {
this.managingPc = pc;
}
/**
* Log a message with the specified logging level.
* @param message the <code>String</code> message.
* @param loglevel the <code>int</code> logging level.
*/
public void log(String message, int loglevel) {
if (managingPc != null) {
managingPc.log(message, loglevel);
} else {
if (loglevel > Project.MSG_WARN) {
System.out.println(message);
} else {
System.err.println(message);
}
}
}
private int readCurrent() throws IOException {
return (eof || currentStream == null) ? EOF : currentStream.read();
}
private void openFile(int index) throws IOException {
closeCurrent();
if (file != null && index < file.length) {
log("Opening " + file[index], Project.MSG_VERBOSE);
try {
currentStream = new BufferedInputStream(
new FileInputStream(file[index]));
} catch (IOException eyeOhEx) {
log("Failed to open " + file[index], Project.MSG_ERR);
throw eyeOhEx;
}
} else {
eof = true;
}
}
private void closeCurrent() {
FileUtils.close(currentStream);
currentStream = null;
}
}
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