| /* |
| * 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 |
| * |
| * https://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.IOException; |
| import java.io.InputStream; |
| import java.nio.file.Files; |
| |
| 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. |
| */ |
| @Override |
| 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. |
| */ |
| @Override |
| 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( |
| Files.newInputStream(file[index].toPath())); |
| } 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; |
| } |
| } |