Copying from Collections to Lang
git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1154837 13f79535-47bb-0310-9956-ffa450edef68
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.commons.collections.comparators;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.Serializable;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.LinkedList;
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import java.util.List;
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import org.apache.commons.collections.AbstractTestObject;
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/**
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* Abstract test class for testing the Comparator interface.
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* <p>
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* Concrete subclasses declare the comparator to be tested.
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* They also declare certain aspects of the tests.
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*
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* @author Stephen Colebourne
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*/
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public abstract class AbstractTestComparator<T> extends AbstractTestObject {
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/**
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* JUnit constructor.
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*
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* @param testName the test class name
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*/
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public AbstractTestComparator(String testName) {
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super(testName);
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}
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//-----------------------------------------------------------------------
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/**
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* Implement this method to return a list of sorted objects.
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*
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* @return sorted objects
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*/
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public abstract List<T> getComparableObjectsOrdered();
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//-----------------------------------------------------------------------
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/**
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* Implements the abstract superclass method to return the comparator.
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*
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* @return a full iterator
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*/
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@Override
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public abstract Comparator<T> makeObject();
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/**
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* Overrides superclass to block tests.
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*/
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@Override
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public boolean supportsEmptyCollections() {
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return false;
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}
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/**
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* Overrides superclass to block tests.
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*/
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@Override
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public boolean supportsFullCollections() {
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return false;
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}
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/**
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* Overrides superclass to set the compatability to version 2
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* as there were no Comparators in version 1.x.
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*/
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@Override
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public String getCompatibilityVersion() {
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return "2";
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}
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//-----------------------------------------------------------------------
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/**
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* Reverse the list.
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*/
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protected void reverseObjects(List<?> list) {
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Collections.reverse(list);
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}
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/**
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* Randomize the list.
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*/
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protected void randomizeObjects(List<?> list) {
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Collections.shuffle(list);
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}
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/**
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* Sort the list.
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*/
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protected void sortObjects(List<T> list, Comparator<? super T> comparator) {
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Collections.sort(list, comparator);
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}
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//-----------------------------------------------------------------------
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/**
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* Test sorting an empty list
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*/
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public void testEmptyListSort() {
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List<T> list = new LinkedList<T>();
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sortObjects(list, makeObject());
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List<T> list2 = new LinkedList<T>();
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assertTrue("Comparator cannot sort empty lists", list2.equals(list));
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}
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/**
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* Test sorting a reversed list.
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*/
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public void testReverseListSort() {
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Comparator<T> comparator = makeObject();
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List<T> randomList = getComparableObjectsOrdered();
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reverseObjects(randomList);
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sortObjects(randomList, comparator);
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List<T> orderedList = getComparableObjectsOrdered();
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assertTrue("Comparator did not reorder the List correctly",
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orderedList.equals(randomList));
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}
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/**
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* Test sorting a random list.
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*/
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public void testRandomListSort() {
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Comparator<T> comparator = makeObject();
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List<T> randomList = getComparableObjectsOrdered();
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randomizeObjects(randomList);
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sortObjects(randomList,comparator);
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List<T> orderedList = getComparableObjectsOrdered();
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/* debug
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Iterator i = randomList.iterator();
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while (i.hasNext()) {
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System.out.println(i.next());
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}
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*/
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assertTrue("Comparator did not reorder the List correctly",
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orderedList.equals(randomList));
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}
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/**
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* Nearly all Comparators should be Serializable.
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*/
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public void testComparatorIsSerializable() {
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Comparator<T> comparator = makeObject();
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assertTrue("This comparator should be Serializable.",
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comparator instanceof Serializable);
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}
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public String getCanonicalComparatorName(Object object) {
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StringBuilder retval = new StringBuilder();
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retval.append("data/test/");
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String colName = object.getClass().getName();
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colName = colName.substring(colName.lastIndexOf(".")+1,colName.length());
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retval.append(colName);
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retval.append(".version");
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retval.append(getCompatibilityVersion());
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retval.append(".obj");
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return retval.toString();
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}
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/**
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* Compare the current serialized form of the Comparator
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* against the canonical version in SVN.
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*/
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@SuppressWarnings("unchecked")
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public void testComparatorCompatibility() throws IOException, ClassNotFoundException {
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if (!skipSerializedCanonicalTests()) {
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Comparator<T> comparator = null;
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// test to make sure the canonical form has been preserved
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try {
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comparator = (Comparator<T>) readExternalFormFromDisk(getCanonicalComparatorName(makeObject()));
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} catch (FileNotFoundException exception) {
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boolean autoCreateSerialized = false;
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if (autoCreateSerialized) {
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comparator = makeObject();
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String fileName = getCanonicalComparatorName(comparator);
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writeExternalFormToDisk((Serializable) comparator, fileName);
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fail("Serialized form could not be found. A serialized version "
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+ "has now been written (and should be added to CVS): " + fileName);
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} else {
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fail("The Serialized form could be located to test serialization "
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+ "compatibility: " + exception.getMessage());
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}
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}
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// make sure the canonical form produces the ordering we currently
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// expect
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List<T> randomList = getComparableObjectsOrdered();
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reverseObjects(randomList);
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sortObjects(randomList, comparator);
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List<T> orderedList = getComparableObjectsOrdered();
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assertTrue("Comparator did not reorder the List correctly",
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orderedList.equals(randomList));
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}
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}
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}
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