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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.taskdefs.optional.extension;
import java.io.File;
import java.util.Iterator;
import java.util.Vector;
import java.util.jar.Manifest;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
/**
* Checks whether an extension is present in a fileset or an extensionSet.
*
* @ant.task name="jarlib-available"
*/
public class JarLibAvailableTask extends Task {
/**
* The library to display information about.
*/
private File libraryFile;
/**
* Filesets specifying all the librarys
* to display information about.
*/
private final Vector extensionFileSets = new Vector();
/**
* The name of the property to set if extension is available.
*/
private String propertyName;
/**
* The extension that is required.
*/
private ExtensionAdapter requiredExtension;
/**
* The name of property to set if extensions are available.
*
* @param property The name of property to set if extensions is available.
*/
public void setProperty(final String property) {
this.propertyName = property;
}
/**
* The JAR library to check.
*
* @param file The jar library to check.
*/
public void setFile(final File file) {
this.libraryFile = file;
}
/**
* Set the Extension looking for.
*
* @param extension Set the Extension looking for.
*/
public void addConfiguredExtension(final ExtensionAdapter extension) {
if (null != requiredExtension) {
final String message = "Can not specify extension to "
+ "search for multiple times.";
throw new BuildException(message);
}
requiredExtension = extension;
}
/**
* Adds a set of extensions to search in.
*
* @param extensionSet a set of extensions to search in.
*/
public void addConfiguredExtensionSet(final ExtensionSet extensionSet) {
extensionFileSets.addElement(extensionSet);
}
/**
* Execute the task.
*
* @throws BuildException if something goes wrong.
*/
public void execute() throws BuildException {
validate();
final Extension test = requiredExtension.toExtension();
// Check if list of files to check has been specified
if (!extensionFileSets.isEmpty()) {
final Iterator iterator = extensionFileSets.iterator();
while (iterator.hasNext()) {
final ExtensionSet extensionSet
= (ExtensionSet) iterator.next();
final Extension[] extensions =
extensionSet.toExtensions(getProject());
for (int i = 0; i < extensions.length; i++) {
final Extension extension = extensions[ i ];
if (extension.isCompatibleWith(test)) {
getProject().setNewProperty(propertyName, "true");
}
}
}
} else {
final Manifest manifest = ExtensionUtil.getManifest(libraryFile);
final Extension[] extensions = Extension.getAvailable(manifest);
for (int i = 0; i < extensions.length; i++) {
final Extension extension = extensions[ i ];
if (extension.isCompatibleWith(test)) {
getProject().setNewProperty(propertyName, "true");
}
}
}
}
/**
* Validate the tasks parameters.
*
* @throws BuildException if invalid parameters found
*/
private void validate() throws BuildException {
if (null == requiredExtension) {
final String message = "Extension element must be specified.";
throw new BuildException(message);
}
if (null == libraryFile && extensionFileSets.isEmpty()) {
final String message = "File attribute not specified.";
throw new BuildException(message);
}
if (null != libraryFile && !libraryFile.exists()) {
final String message = "File '" + libraryFile + "' does not exist.";
throw new BuildException(message);
}
if (null != libraryFile && !libraryFile.isFile()) {
final String message = "\'" + libraryFile + "\' is not a file.";
throw new BuildException(message);
}
}
}
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