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 | package org.apache.tools.ant.taskdefs.optional.extension;
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18 |
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19 | import java.io.File;
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20 | import java.util.Iterator;
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21 | import java.util.Vector;
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22 | import java.util.jar.Manifest;
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23 | import org.apache.tools.ant.BuildException;
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24 | import org.apache.tools.ant.Task;
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25 |
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26 | /**
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27 | * Checks whether an extension is present in a fileset or an extensionSet.
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28 | *
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29 | * @ant.task name="jarlib-available"
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30 | */
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31 | public class JarLibAvailableTask extends Task {
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32 | /**
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33 | * The library to display information about.
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34 | */
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35 | private File libraryFile;
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36 |
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37 | /**
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38 | * Filesets specifying all the librarys
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39 | * to display information about.
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40 | */
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41 | private final Vector extensionFileSets = new Vector();
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42 |
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43 | /**
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44 | * The name of the property to set if extension is available.
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45 | */
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46 | private String propertyName;
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47 |
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48 | /**
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49 | * The extension that is required.
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50 | */
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51 | private ExtensionAdapter requiredExtension;
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52 |
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53 | /**
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54 | * The name of property to set if extensions are available.
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55 | *
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56 | * @param property The name of property to set if extensions is available.
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57 | */
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58 | public void setProperty(final String property) {
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59 | this.propertyName = property;
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60 | }
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61 |
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62 | /**
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63 | * The JAR library to check.
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64 | *
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65 | * @param file The jar library to check.
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66 | */
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67 | public void setFile(final File file) {
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68 | this.libraryFile = file;
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69 | }
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70 |
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71 | /**
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72 | * Set the Extension looking for.
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73 | *
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74 | * @param extension Set the Extension looking for.
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75 | */
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76 | public void addConfiguredExtension(final ExtensionAdapter extension) {
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77 | if (null != requiredExtension) {
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78 | final String message = "Can not specify extension to "
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79 | + "search for multiple times.";
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80 | throw new BuildException(message);
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81 | }
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82 | requiredExtension = extension;
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83 | }
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84 |
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85 | /**
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86 | * Adds a set of extensions to search in.
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87 | *
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88 | * @param extensionSet a set of extensions to search in.
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89 | */
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90 | public void addConfiguredExtensionSet(final ExtensionSet extensionSet) {
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91 | extensionFileSets.addElement(extensionSet);
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92 | }
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93 |
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94 | /**
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95 | * Execute the task.
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96 | *
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97 | * @throws BuildException if somethign goes wrong.
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98 | */
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99 | public void execute() throws BuildException {
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100 | validate();
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101 |
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102 | final Extension test = requiredExtension.toExtension();
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103 |
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104 | // Check if list of files to check has been specified
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105 | if (!extensionFileSets.isEmpty()) {
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106 | final Iterator iterator = extensionFileSets.iterator();
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107 | while (iterator.hasNext()) {
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108 | final ExtensionSet extensionSet
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109 | = (ExtensionSet) iterator.next();
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110 | final Extension[] extensions =
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111 | extensionSet.toExtensions(getProject());
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112 | for (int i = 0; i < extensions.length; i++) {
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113 | final Extension extension = extensions[ i ];
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114 | if (extension.isCompatibleWith(test)) {
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115 | getProject().setNewProperty(propertyName, "true");
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116 | }
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117 | }
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118 | }
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119 | } else {
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120 | final Manifest manifest = ExtensionUtil.getManifest(libraryFile);
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121 | final Extension[] extensions = Extension.getAvailable(manifest);
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122 | for (int i = 0; i < extensions.length; i++) {
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123 | final Extension extension = extensions[ i ];
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124 | if (extension.isCompatibleWith(test)) {
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125 | getProject().setNewProperty(propertyName, "true");
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126 | }
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127 | }
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128 | }
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129 | }
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130 |
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131 | /**
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132 | * Validate the tasks parameters.
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133 | *
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134 | * @throws BuildException if invalid parameters found
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135 | */
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136 | private void validate() throws BuildException {
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137 | if (null == requiredExtension) {
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138 | final String message = "Extension element must be specified.";
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139 | throw new BuildException(message);
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140 | }
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141 |
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142 | if (null == libraryFile && extensionFileSets.isEmpty()) {
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143 | final String message = "File attribute not specified.";
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144 | throw new BuildException(message);
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145 | }
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146 | if (null != libraryFile && !libraryFile.exists()) {
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147 | final String message = "File '" + libraryFile + "' does not exist.";
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148 | throw new BuildException(message);
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149 | }
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150 | if (null != libraryFile && !libraryFile.isFile()) {
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151 | final String message = "\'" + libraryFile + "\' is not a file.";
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152 | throw new BuildException(message);
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153 | }
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154 | }
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155 | }
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