/*
* Copyright 2002-2006 the original author or authors.
*
* Licensed 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.springframework.instrument.classloading;
import java.io.IOException;
import java.util.Enumeration;
import junit.framework.TestCase;
/**
* @author Rod Johnson
* @since 2.0
*/
public class ResourceOverridingShadowingClassLoaderTests extends TestCase {
private static final String EXISTING_RESOURCE = "org/springframework/instrument/classloading/testResource.xml";
private ClassLoader thisClassLoader = getClass().getClassLoader();
private ResourceOverridingShadowingClassLoader overridingLoader = new ResourceOverridingShadowingClassLoader(thisClassLoader);
public void testFindsExistingResourceWithGetResourceAndNoOverrides() {
assertNotNull(thisClassLoader.getResource(EXISTING_RESOURCE));
assertNotNull(overridingLoader.getResource(EXISTING_RESOURCE));
}
public void testDoesNotFindExistingResourceWithGetResourceAndNullOverride() {
assertNotNull(thisClassLoader.getResource(EXISTING_RESOURCE));
overridingLoader.override(EXISTING_RESOURCE, null);
assertNull(overridingLoader.getResource(EXISTING_RESOURCE));
}
public void testFindsExistingResourceWithGetResourceAsStreamAndNoOverrides() {
assertNotNull(thisClassLoader.getResourceAsStream(EXISTING_RESOURCE));
assertNotNull(overridingLoader.getResourceAsStream(EXISTING_RESOURCE));
}
public void testDoesNotFindExistingResourceWithGetResourceAsStreamAndNullOverride() {
assertNotNull(thisClassLoader.getResourceAsStream(EXISTING_RESOURCE));
overridingLoader.override(EXISTING_RESOURCE, null);
assertNull(overridingLoader.getResourceAsStream(EXISTING_RESOURCE));
}
public void testFindsExistingResourceWithGetResourcesAndNoOverrides() throws IOException {
assertNotNull(thisClassLoader.getResources(EXISTING_RESOURCE));
assertNotNull(overridingLoader.getResources(EXISTING_RESOURCE));
assertEquals(1, countElements(overridingLoader.getResources(EXISTING_RESOURCE)));
}
public void testDoesNotFindExistingResourceWithGetResourcesAndNullOverride() throws IOException {
assertNotNull(thisClassLoader.getResources(EXISTING_RESOURCE));
overridingLoader.override(EXISTING_RESOURCE, null);
assertEquals(0, countElements(overridingLoader.getResources(EXISTING_RESOURCE)));
}
private int countElements(Enumeration e) {
int elts = 0;
while (e.hasMoreElements()) {
e.nextElement();
++elts;
}
return elts;
}
}