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/*
*
* Derby - Class org.apache.derbyTesting.junit.ClasspathSetup
*
* 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.derbyTesting.junit;
import java.io.Closeable;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import junit.extensions.TestSetup;
import junit.framework.Test;
/**
* <p>
* This decorator adds another resource to the classpath, removing
* it at tearDown().
* </p>
*/
public class ClasspathSetup extends TestSetup
{
///////////////////////////////////////////////////////////////////////////////////
//
// CONSTANTS
//
///////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////
//
// STATE
//
///////////////////////////////////////////////////////////////////////////////////
private URL _resource;
private ClassLoader _originalClassLoader;
private URLClassLoader _newClassLoader;
///////////////////////////////////////////////////////////////////////////////////
//
// CONSTRUCTORS
//
///////////////////////////////////////////////////////////////////////////////////
/**
* <p>
* Add the indicated URL to the classpath.
* </p>
*/
public ClasspathSetup(Test test, URL resource)
{
super( test );
_resource = resource;
}
///////////////////////////////////////////////////////////////////////////////////
//
// JUnit BEHAVIOR
//
///////////////////////////////////////////////////////////////////////////////////
protected void setUp()
{
AccessController.doPrivileged
(
new PrivilegedAction<Void>()
{
public Void run()
{
_originalClassLoader = Thread.currentThread().getContextClassLoader();
_newClassLoader = new URLClassLoader( new URL[] { _resource }, _originalClassLoader );
Thread.currentThread().setContextClassLoader( _newClassLoader );
return null;
}
}
);
}
protected void tearDown() throws Exception
{
AccessController.doPrivileged
(
new PrivilegedExceptionAction<Void>()
{
public Void run() throws IOException
{
Thread.currentThread().setContextClassLoader( _originalClassLoader );
// On Java 7 and higher, URLClassLoader implements the
// Closable interface and has a close() method. Use that
// method, if it's available, to free all resources
// associated with the class loader. DERBY-2162.
if (_newClassLoader instanceof Closeable) {
((Closeable) _newClassLoader).close();
}
return null;
}
}
);
_originalClassLoader = null;
_newClassLoader = null;
_resource = null;
}
/**
* Check whether this platform supports closing a {@code URLClassLoader}.
*
* @return {@code true} if {@code URLClassLoader} has a {@code close()}
* method (Java 7 and higher), or {@code false} otherwise
*/
public static boolean supportsClose() {
return Closeable.class.isAssignableFrom(URLClassLoader.class);
}
}
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