1 | /*
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2 | * Copyright 2002-2004 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.taskdefs;
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19 |
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20 | import java.io.File;
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21 | import java.io.FileInputStream;
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22 | import java.io.InputStreamReader;
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23 | import java.io.FileOutputStream;
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24 | import java.io.OutputStreamWriter;
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25 | import java.io.IOException;
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26 | import java.io.PrintWriter;
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27 | import org.apache.tools.ant.BuildException;
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28 | import org.apache.tools.ant.Project;
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29 | import org.apache.tools.ant.Task;
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30 | import org.apache.tools.ant.types.EnumeratedAttribute;
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31 |
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32 | /**
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33 | * Creates a manifest file for inclusion in a JAR, Ant task wrapper
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34 | * around {@link Manifest Manifest}. This task can be used to write a
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35 | * Manifest file, optionally replacing or updating an existing file.
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36 | *
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37 | *
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38 | * @since Ant 1.5
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39 | *
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40 | * @ant.task category="java"
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41 | */
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42 | public class ManifestTask extends Task {
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43 |
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44 | /**
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45 | * Holds the real data.
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46 | */
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47 | private Manifest nestedManifest = new Manifest();
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48 |
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49 | /**
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50 | * The file to which the manifest should be written when used as a task
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51 | */
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52 | private File manifestFile;
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53 |
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54 | /**
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55 | * The mode with which the manifest file is written
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56 | */
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57 | private Mode mode;
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58 |
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59 | /**
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60 | * The encoding of the manifest file
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61 | */
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62 | private String encoding;
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63 |
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64 | /**
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65 | * Helper class for Manifest's mode attribute.
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66 | */
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67 | public static class Mode extends EnumeratedAttribute {
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68 | /**
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69 | * Get Allowed values for the mode attribute.
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70 | *
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71 | * @return a String array of the allowed values.
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72 | */
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73 | public String[] getValues() {
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74 | return new String[] {"update", "replace"};
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75 | }
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76 | }
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77 |
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78 | /**
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79 | * Default constructor
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80 | */
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81 | public ManifestTask() {
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82 | mode = new Mode();
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83 | mode.setValue("replace");
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84 | }
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85 |
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86 | /**
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87 | * Add a section to the manifest
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88 | *
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89 | * @param section the manifest section to be added
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90 | *
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91 | * @exception ManifestException if the section is not valid.
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92 | */
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93 | public void addConfiguredSection(Manifest.Section section)
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94 | throws ManifestException {
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95 | nestedManifest.addConfiguredSection(section);
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96 | }
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97 |
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98 | /**
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99 | * Add an attribute to the manifest - it is added to the main section.
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100 | *
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101 | * @param attribute the attribute to be added.
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102 | *
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103 | * @exception ManifestException if the attribute is not valid.
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104 | */
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105 | public void addConfiguredAttribute(Manifest.Attribute attribute)
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106 | throws ManifestException {
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107 | nestedManifest.addConfiguredAttribute(attribute);
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108 | }
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109 |
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110 | /**
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111 | * The name of the manifest file to create/update.
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112 | * Required if used as a task.
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113 | * @param f the Manifest file to be written
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114 | */
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115 | public void setFile(File f) {
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116 | manifestFile = f;
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117 | }
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118 |
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119 | /**
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120 | * The encoding to use for reading in an existing manifest file
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121 | * @param encoding the manifest file encoding.
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122 | */
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123 | public void setEncoding(String encoding) {
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124 | this.encoding = encoding;
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125 | }
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126 |
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127 | /**
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128 | * Update policy: either "update" or "replace"; default is "replace".
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129 | * @param m the mode value - update or replace.
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130 | */
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131 | public void setMode(Mode m) {
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132 | mode = m;
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133 | }
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134 |
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135 | /**
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136 | * Create or update the Manifest when used as a task.
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137 | *
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138 | * @throws BuildException if the manifest cannot be written.
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139 | */
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140 | public void execute() throws BuildException {
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141 | if (manifestFile == null) {
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142 | throw new BuildException("the file attribute is required");
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143 | }
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144 |
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145 | Manifest toWrite = Manifest.getDefaultManifest();
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146 | Manifest current = null;
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147 | BuildException error = null;
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148 |
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149 | if (manifestFile.exists()) {
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150 | FileInputStream fis = null;
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151 | InputStreamReader isr = null;
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152 | try {
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153 | fis = new FileInputStream(manifestFile);
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154 | if (encoding == null) {
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155 | isr = new InputStreamReader(fis, "UTF-8");
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156 | } else {
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157 | isr = new InputStreamReader(fis, encoding);
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158 | }
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159 | current = new Manifest(isr);
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160 | } catch (ManifestException m) {
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161 | error = new BuildException("Existing manifest " + manifestFile
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162 | + " is invalid", m, getLocation());
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163 | } catch (IOException e) {
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164 | error = new BuildException("Failed to read " + manifestFile,
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165 | e, getLocation());
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166 | } finally {
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167 | if (isr != null) {
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168 | try {
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169 | isr.close();
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170 | } catch (IOException e) {
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171 | // ignore
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172 | }
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173 | }
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174 | }
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175 | }
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176 |
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177 | try {
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178 | if (mode.getValue().equals("update") && manifestFile.exists()) {
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179 | if (current != null) {
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180 | toWrite.merge(current);
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181 | } else if (error != null) {
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182 | throw error;
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183 | }
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184 | }
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185 |
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186 | toWrite.merge(nestedManifest);
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187 | } catch (ManifestException m) {
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188 | throw new BuildException("Manifest is invalid", m, getLocation());
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189 | }
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190 |
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191 | if (toWrite.equals(current)) {
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192 | log("Manifest has not changed, do not recreate",
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193 | Project.MSG_VERBOSE);
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194 | return;
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195 | }
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196 |
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197 | PrintWriter w = null;
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198 | try {
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199 | FileOutputStream fos = new FileOutputStream(manifestFile);
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200 | OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");
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201 | w = new PrintWriter(osw);
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202 | toWrite.write(w);
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203 | } catch (IOException e) {
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204 | throw new BuildException("Failed to write " + manifestFile,
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205 | e, getLocation());
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206 | } finally {
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207 | if (w != null) {
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208 | w.close();
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209 | }
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210 | }
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211 | }
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212 |
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213 | }
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