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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.types.resources;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class LazyResourceCollectionTest {
private class StringResourceCollection implements ResourceCollection {
List resources = Arrays.<Resource>asList();
List createdIterators = new ArrayList();
public int size() {
return resources.size();
}
public Iterator<Resource> iterator() {
StringResourceIterator it = new StringResourceIterator();
createdIterators.add(it);
return it;
}
public boolean isFilesystemOnly() {
return false;
}
}
private class StringResourceIterator implements Iterator {
int cursor = 0;
public void remove() {
throw new UnsupportedOperationException();
}
public Object next() {
if (cursor < 3) {
cursor++;
return new StringResource("r" + cursor);
}
return null;
}
public boolean hasNext() {
return cursor < 3;
}
}
@Test
public void testLazyLoading() throws Exception {
StringResourceCollection collectionTest = new StringResourceCollection();
LazyResourceCollectionWrapper lazyCollection = new LazyResourceCollectionWrapper();
lazyCollection.add(collectionTest);
Iterator<Resource> it = lazyCollection.iterator();
assertOneCreatedIterator(collectionTest);
StringResourceIterator stringResourceIterator = (StringResourceIterator) collectionTest.createdIterators
.get(0);
assertEquals("A resource was loaded without iterating", 1,
stringResourceIterator.cursor);
StringResource r = (StringResource) it.next();
assertOneCreatedIterator(collectionTest);
assertEquals("r1", r.getValue());
assertEquals("Iterating once load more than 1 resource", 2,
stringResourceIterator.cursor);
r = (StringResource) it.next();
assertOneCreatedIterator(collectionTest);
assertEquals("r2", r.getValue());
assertEquals("Iterating twice load more than 2 resources", 3,
stringResourceIterator.cursor);
r = (StringResource) it.next();
assertOneCreatedIterator(collectionTest);
assertEquals("r3", r.getValue());
assertEquals("Iterating 3 times load more than 3 resources", 3,
stringResourceIterator.cursor);
try {
it.next();
fail("NoSuchElementException should have been raised");
} catch (NoSuchElementException e) {
// ok
}
}
private void assertOneCreatedIterator(
StringResourceCollection testCollection) {
assertEquals("More than one iterator has been created", 1,
testCollection.createdIterators.size());
}
@Test
public void testCaching() throws Exception {
StringResourceCollection collectionTest = new StringResourceCollection();
LazyResourceCollectionWrapper lazyCollection = new LazyResourceCollectionWrapper();
lazyCollection.add(collectionTest);
assertTrue(lazyCollection.isCache());
Iterator<Resource> it1 = lazyCollection.iterator();
assertOneCreatedIterator(collectionTest);
Iterator<Resource> it2 = lazyCollection.iterator();
assertOneCreatedIterator(collectionTest);
StringResourceIterator stringResourceIterator = (StringResourceIterator) collectionTest.createdIterators
.get(0);
assertEquals("A resource was loaded without iterating", 1,
stringResourceIterator.cursor);
StringResource r = (StringResource) it1.next();
assertEquals("r1", r.getValue());
assertEquals("Iterating once load more than 1 resource", 2,
stringResourceIterator.cursor);
r = (StringResource) it2.next();
assertEquals("r1", r.getValue());
assertEquals(
"The second iterator did not lookup in the cache for a resource",
2, stringResourceIterator.cursor);
r = (StringResource) it2.next();
assertEquals("r2", r.getValue());
assertEquals("Iterating twice load more than 2 resources", 3,
stringResourceIterator.cursor);
r = (StringResource) it1.next();
assertEquals("r2", r.getValue());
assertEquals(
"The first iterator did not lookup in the cache for a resource",
3, stringResourceIterator.cursor);
r = (StringResource) it2.next();
assertEquals("r3", r.getValue());
assertEquals("Iterating 3 times load more than 3 resources", 3,
stringResourceIterator.cursor);
r = (StringResource) it1.next();
assertEquals("r3", r.getValue());
assertEquals(
"The first iterator did not lookup in the cache for a resource",
3, stringResourceIterator.cursor);
try {
it1.next();
fail("NoSuchElementException should have been raised");
} catch (NoSuchElementException e) {
// ok
}
try {
it2.next();
fail("NoSuchElementException should have been raised");
} catch (NoSuchElementException e) {
// ok
}
}
}
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