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Improved IndexedCollection, refactored test to comply with standard test framework. 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1377059 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Thomas Neidhart 2012-08-24 19:21:14 +00:00
parent e1f8cea8a6
commit 6cbcb9ebc6
3 changed files with 212 additions and 125 deletions
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140
src/main/java/org/apache/commons/collections/collection/IndexedCollection.java
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@ -18,6 +18,7 @@ package org.apache.commons.collections.collection;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.collections.Transformer;
@ -40,12 +41,17 @@ import org.apache.commons.collections.Transformer;
* @version $Id$
*/
// TODO support MultiMap/non-unique index behavior
// TODO add support for remove and clear
public class IndexedCollection<K, C> extends AbstractCollectionDecorator<C> {
/** Serialization version */
private static final long serialVersionUID = -5512610452568370038L;
/** The {@link Transformer} for generating index keys. */
private final Transformer<C, K> keyTransformer;
/** The map of indexes to collected objects. */
private final Map<K, C> index;
/**
* Create an {@link IndexedCollection} for a unique index.
*
@ -60,67 +66,126 @@ public class IndexedCollection<K, C> extends AbstractCollectionDecorator<C> {
return new IndexedCollection<K, C>(coll, keyTransformer, new HashMap<K, C>());
}
/**
* The {@link Transformer} for generating index keys.
*/
private final Transformer<C, K> keyTransformer;
/**
* The map of indexes to collected objects.
*/
private final HashMap<K, C> index;
/**
* Create a {@link IndexedCollection} for a unique index.
*
* @param coll the decorated {@link Collection}.
* @param keyTransformer the {@link Transformer} for generating index keys.
* @param coll decorated {@link Collection}
* @param keyTransformer {@link Transformer} for generating index keys
* @param map map to use as index
*/
public IndexedCollection(Collection<C> coll, Transformer<C, K> keyTransformer, HashMap<K, C> map) {
super(coll);
this.keyTransformer = keyTransformer;
this.index = map;
this.index = new HashMap<K, C>();
reindex();
}
@Override
public boolean add(C object) {
final boolean added = super.add(object);
if (added) {
addToIndex(object);
}
return added;
}
@Override
public boolean addAll(Collection<? extends C> coll) {
boolean changed = false;
for (C c: coll) {
changed |= add(c);
}
return changed;
}
@Override
public void clear() {
super.clear();
index.clear();
}
/**
* {@inheritDoc}
* <p>
* Note: uses the index for fast lookup
*/
@SuppressWarnings("unchecked")
@Override
public boolean contains(Object object) {
return index.containsKey(keyTransformer.transform((C) object));
}
/**
* {@inheritDoc}
* <p>
* Note: uses the index for fast lookup
*/
@Override
public boolean containsAll(Collection<?> coll) {
for (Object o : coll) {
if (!contains(o)) {
return false;
}
}
return true;
}
/**
* Get the element associated with the given key.
*
* @param key key to look up
* @return element found
*/
public C get(K key) {
return index.get(key);
}
/**
* Clears the index and re-indexes the entire decorated {@link Collection}.
*/
public void reindex() {
index.clear();
for (C c : decorated()) {
addIndex(c);
addToIndex(c);
}
}
/**
* Adds an object to the collection and index.
*/
@SuppressWarnings("unchecked")
@Override
// TODO: Add error handling for when super.add() fails
public boolean add(C object) {
addIndex(object);
return super.add(object);
public boolean remove(Object object) {
final boolean removed = super.remove(object);
if (removed) {
removeFromIndex((C) object);
}
return removed;
}
/**
* Adds an entire collection to the collection and index.
*/
@Override
// TODO: Add error handling for when super.addAll() fails
public boolean addAll(Collection<? extends C> coll) {
for (C c : coll) {
addIndex(c);
public boolean removeAll(Collection<?> coll) {
boolean changed = false;
for (Object o : coll) {
changed |= remove(o);
}
return super.addAll(coll);
return changed;
}
@Override
public boolean retainAll(Collection<?> coll) {
final boolean changed = super.retainAll(coll);
if (changed) {
reindex();
}
return changed;
}
//-----------------------------------------------------------------------
/**
* Provides checking for adding the index.
*
* @param object the object to index.
* @param object the object to index
*/
private void addIndex(C object) {
private void addToIndex(C object) {
final C existingObject = index.put(keyTransformer.transform(object), object);
if (existingObject != null) {
throw new IllegalArgumentException("Duplicate key in uniquely indexed collection.");
@ -128,11 +193,12 @@ public class IndexedCollection<K, C> extends AbstractCollectionDecorator<C> {
}
/**
* Get the element associated with the given key.
* @param key to look up
* @return element found
* Removes an object from the index.
*
* @param object the object to remove
*/
public C get(K key) {
return index.get(key);
private void removeFromIndex(C object) {
index.remove(keyTransformer.transform(object));
}
}

38
src/test/java/org/apache/commons/collections/AbstractDecoratedCollectionTest.java
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@ -1,38 +0,0 @@
/*
* 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.commons.collections;
import java.util.ArrayList;
import java.util.Collection;
import org.junit.Before;
public abstract class AbstractDecoratedCollectionTest<C> {
/**
* The {@link Collection} being decorated.
*/
protected Collection<C> original;
/**
* The Collection under test that decorates {@link #original}.
*/
protected Collection<C> decorated;
@Before
public void setUpDecoratedCollection() throws Exception {
original = new ArrayList<C>();
}
}

159
src/test/java/org/apache/commons/collections/collection/IndexedCollectionTest.java
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@ -17,35 +17,94 @@
package org.apache.commons.collections.collection;
import static java.util.Arrays.asList;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertNull;
import org.apache.commons.collections.AbstractDecoratedCollectionTest;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.collection.IndexedCollection;
import org.junit.Before;
import org.junit.Test;
@SuppressWarnings("boxing")
public class IndexedCollectionTest extends AbstractDecoratedCollectionTest<String> {
private IndexedCollection<Integer, String> indexed;
public class IndexedCollectionTest extends AbstractCollectionTest<String> {
@Before
public void setUp() throws Exception {
indexed = IndexedCollection.uniqueIndexedCollection(original, new Transformer<String, Integer>() {
public Integer transform(String input) {
return Integer.parseInt(input);
}
});
decorated = indexed;
public IndexedCollectionTest(String name) {
super(name);
}
//------------------------------------------------------------------------
protected Collection<String> decorateCollection(Collection<String> collection) {
return IndexedCollection.uniqueIndexedCollection(collection, new IntegerTransformer());
}
private static final class IntegerTransformer implements Transformer<String, Integer>, Serializable {
private static final long serialVersionUID = 809439581555072949L;
public Integer transform(String input) {
return Integer.valueOf(input);
}
}
@Override
public Collection<String> makeObject() {
return decorateCollection(new ArrayList<String>());
}
@Override
public Collection<String> makeConfirmedCollection() {
return new ArrayList<String>();
}
@Override
public String[] getFullElements() {
return (String[]) new String[] { "1", "3", "5", "7", "2", "4", "6" };
}
@Override
public String[] getOtherElements() {
return new String[] {"9", "88", "678", "87", "98", "78", "99"};
}
@Override
public Collection<String> makeFullCollection() {
List<String> list = new ArrayList<String>();
list.addAll(Arrays.asList(getFullElements()));
return decorateCollection(list);
}
@Override
public Collection<String> makeConfirmedFullCollection() {
List<String> list = new ArrayList<String>();
list.addAll(Arrays.asList(getFullElements()));
return list;
}
@Override
protected boolean skipSerializedCanonicalTests() {
// FIXME: support canonical tests
return true;
}
//------------------------------------------------------------------------
public void testCollectionAddAll() {
// FIXME: does not work as we do not support multi-keys yet
}
@Test
public void addedObjectsCanBeRetrievedByKey() throws Exception {
decorated.add("12");
decorated.add("16");
decorated.add("1");
decorated.addAll(asList("2","3","4"));
Collection<String> coll = getCollection();
coll.add("12");
coll.add("16");
coll.add("1");
coll.addAll(asList("2","3","4"));
@SuppressWarnings("unchecked")
IndexedCollection<Integer, String> indexed = (IndexedCollection<Integer, String>) coll;
assertEquals("12", indexed.get(12));
assertEquals("16", indexed.get(16));
assertEquals("1", indexed.get(1));
@ -56,38 +115,38 @@ public class IndexedCollectionTest extends AbstractDecoratedCollectionTest<Strin
@Test(expected=IllegalArgumentException.class)
public void ensureDuplicateObjectsCauseException() throws Exception {
decorated.add("1");
decorated.add("1");
getCollection().add("1");
getCollection().add("1");
}
@Test
public void decoratedCollectionIsIndexedOnCreation() throws Exception {
original.add("1");
original.add("2");
original.add("3");
indexed = IndexedCollection.uniqueIndexedCollection(original, new Transformer<String, Integer>() {
public Integer transform(String input) {
return Integer.parseInt(input);
}
});
assertEquals("1", indexed.get(1));
assertEquals("2", indexed.get(2));
assertEquals("3", indexed.get(3));
}
@Test
public void reindexUpdatesIndexWhenTheDecoratedCollectionIsModifiedSeparately() throws Exception {
original.add("1");
original.add("2");
original.add("3");
assertNull(indexed.get(1));
assertNull(indexed.get(2));
assertNull(indexed.get(3));
indexed.reindex();
assertEquals("1", indexed.get(1));
assertEquals("2", indexed.get(2));
assertEquals("3", indexed.get(3));
}
// @Test
// public void decoratedCollectionIsIndexedOnCreation() throws Exception {
// original.add("1");
// original.add("2");
// original.add("3");
//
// indexed = IndexedCollection.uniqueIndexedCollection(original, new Transformer<String, Integer>() {
// public Integer transform(String input) {
// return Integer.parseInt(input);
// }
// });
// assertEquals("1", indexed.get(1));
// assertEquals("2", indexed.get(2));
// assertEquals("3", indexed.get(3));
// }
//
// @Test
// public void reindexUpdatesIndexWhenTheDecoratedCollectionIsModifiedSeparately() throws Exception {
// original.add("1");
// original.add("2");
// original.add("3");
//
// assertNull(indexed.get(1));
// assertNull(indexed.get(2));
// assertNull(indexed.get(3));
// indexed.reindex();
// assertEquals("1", indexed.get(1));
// assertEquals("2", indexed.get(2));
// assertEquals("3", indexed.get(3));
// }
}