1 | /*
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2 | * Copyright 2004-2005 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.ant.util;
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19 |
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20 | import java.io.File;
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21 | import java.io.InputStream;
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22 | import java.io.BufferedInputStream;
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23 | import java.io.IOException;
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24 | import java.io.FileInputStream;
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25 |
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26 | import org.apache.tools.ant.Project;
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27 | import org.apache.tools.ant.ProjectComponent;
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28 | import org.apache.tools.ant.Task;
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29 |
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30 | /**
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31 | * Special <code>InputStream</code> that will
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32 | * concatenate the contents of an array of files.
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33 | */
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34 | public class ConcatFileInputStream extends InputStream {
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35 |
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36 | private static final int EOF = -1;
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37 | private int currentIndex = -1;
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38 | private boolean eof = false;
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39 | private File[] file;
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40 | private InputStream currentStream;
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41 | private ProjectComponent managingPc;
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42 |
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43 | /**
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44 | * Construct a new <code>ConcatFileInputStream</code>
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45 | * with the specified <code>File[]</code>.
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46 | * @param file <code>File[]</code>.
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47 | * @throws IOException if I/O errors occur.
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48 | */
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49 | public ConcatFileInputStream(File[] file) throws IOException {
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50 | this.file = file;
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51 | }
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52 |
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53 | // inherit doc
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54 | public void close() throws IOException {
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55 | closeCurrent();
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56 | eof = true;
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57 | }
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58 |
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59 | // inherit doc
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60 | public int read() throws IOException {
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61 | int result = readCurrent();
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62 | if (result == EOF && !eof) {
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63 | openFile(++currentIndex);
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64 | result = readCurrent();
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65 | }
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66 | return result;
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67 | }
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68 |
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69 | /**
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70 | * Set a managing <code>Task</code> for
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71 | * this <code>ConcatFileInputStream</code>.
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72 | * @param task the managing <code>Task</code>.
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73 | */
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74 | public void setManagingTask(Task task) {
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75 | setManagingComponent(task);
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76 | }
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77 |
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78 | /**
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79 | * Set a managing <code>Task</code> for
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80 | * this <code>ConcatFileInputStream</code>.
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81 | * @param task the managing <code>Task</code>.
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82 | */
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83 | public void setManagingComponent(ProjectComponent pc) {
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84 | this.managingPc = pc;
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85 | }
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86 |
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87 | /**
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88 | * Log a message with the specified logging level.
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89 | * @param message the <code>String</code> message.
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90 | * @param loglevel the <code>int</code> logging level.
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91 | */
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92 | public void log(String message, int loglevel) {
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93 | if (managingPc != null) {
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94 | managingPc.log(message, loglevel);
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95 | } else {
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96 | if (loglevel > Project.MSG_WARN) {
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97 | System.out.println(message);
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98 | } else {
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99 | System.err.println(message);
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100 | }
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101 | }
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102 | }
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103 |
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104 | private int readCurrent() throws IOException {
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105 | return (eof || currentStream == null) ? EOF : currentStream.read();
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106 | }
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107 |
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108 | private void openFile(int index) throws IOException {
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109 | closeCurrent();
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110 | if (file != null && index < file.length) {
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111 | log("Opening " + file[index], Project.MSG_VERBOSE);
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112 | try {
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113 | currentStream = new BufferedInputStream(
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114 | new FileInputStream(file[index]));
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115 | } catch (IOException eyeOhEx) {
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116 | log("Failed to open " + file[index], Project.MSG_ERR);
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117 | throw eyeOhEx;
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118 | }
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119 | } else {
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120 | eof = true;
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121 | }
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122 | }
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123 |
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124 | private void closeCurrent() {
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125 | FileUtils.close(currentStream);
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126 | currentStream = null;
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127 | }
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128 | }
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