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Java example source code file (MultisetsCollectionTest.java)

This example Java source code file (MultisetsCollectionTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, elements_to_filter_out, gwtincompatible, list, multiset, multisetscollectiontest, override, predicate, testcase, teststringmultisetgenerator, testsuite, todo, util

The MultisetsCollectionTest.java Java example source code

/*
 * Copyright (C) 2008 The Guava 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 com.google.common.collect;

import static java.util.Arrays.asList;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Objects;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.MultisetTestSuiteBuilder;
import com.google.common.collect.testing.google.SortedMultisetTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringMultisetGenerator;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Collection tests on wrappers from {@link Multisets}.
 *
 * @author Jared Levy
 */
@GwtIncompatible // suite // TODO(cpovirk): set up collect/gwt/suites version
public class MultisetsCollectionTest extends TestCase {
  public static Test suite() {
    TestSuite suite = new TestSuite();

    suite.addTest(MultisetTestSuiteBuilder.using(
        unmodifiableMultisetGenerator())
        .withFeatures(CollectionSize.ANY, CollectionFeature.KNOWN_ORDER,
            CollectionFeature.SERIALIZABLE,
            CollectionFeature.ALLOWS_NULL_QUERIES)
        .named("Multisets.unmodifiableMultiset[LinkedHashMultiset]")
        .createTestSuite());

    suite.addTest(SortedMultisetTestSuiteBuilder.using(unmodifiableSortedMultisetGenerator())
        .withFeatures(CollectionSize.ANY, CollectionFeature.KNOWN_ORDER,
            CollectionFeature.ALLOWS_NULL_QUERIES)
        .named("Multisets.unmodifiableMultiset[TreeMultiset]")
        .createTestSuite());

    suite.addTest(MultisetTestSuiteBuilder.using(unionGenerator())
        .withFeatures(CollectionSize.ANY,
            CollectionFeature.ALLOWS_NULL_VALUES)
        .named("Multisets.union")
        .createTestSuite());

    suite.addTest(MultisetTestSuiteBuilder.using(intersectionGenerator())
        .withFeatures(CollectionSize.ANY,
            CollectionFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.KNOWN_ORDER)
        .named("Multisets.intersection")
        .createTestSuite());

    suite.addTest(MultisetTestSuiteBuilder.using(sumGenerator())
        .withFeatures(CollectionSize.ANY,
            CollectionFeature.ALLOWS_NULL_VALUES)
        .named("Multisets.sum")
        .createTestSuite());

    suite.addTest(MultisetTestSuiteBuilder.using(differenceGenerator())
        .withFeatures(CollectionSize.ANY,
            CollectionFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.KNOWN_ORDER)
        .named("Multisets.difference")
        .createTestSuite());

    suite.addTest(MultisetTestSuiteBuilder.using(filteredGenerator())
        .withFeatures(CollectionSize.ANY,
            CollectionFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.KNOWN_ORDER,
            CollectionFeature.SUPPORTS_ADD,
            CollectionFeature.SUPPORTS_REMOVE)
        .named("Multiset.filter[Multiset, Predicate]")
        .createTestSuite());

    return suite;
  }

  private static TestStringMultisetGenerator unmodifiableMultisetGenerator() {
    return new TestStringMultisetGenerator() {
      @Override protected Multiset<String> create(String[] elements) {
        return Multisets.unmodifiableMultiset(
            LinkedHashMultiset.create(asList(elements)));
      }
      @Override public List<String> order(List insertionOrder) {
        List<String> order = new ArrayList();
        for (String s : insertionOrder) {
          int index = order.indexOf(s);
          if (index == -1) {
            order.add(s);
          } else {
            order.add(index, s);
          }
        }
        return order;
      }
    };
  }

  private static TestStringMultisetGenerator unmodifiableSortedMultisetGenerator() {
    return new TestStringMultisetGenerator() {
      @Override protected Multiset<String> create(String[] elements) {
        return Multisets.unmodifiableSortedMultiset(
            TreeMultiset.create(asList(elements)));
      }
      @Override public List<String> order(List insertionOrder) {
        Collections.sort(insertionOrder);
        return insertionOrder;
      }
    };
  }

  private static TestStringMultisetGenerator unionGenerator() {
    return new TestStringMultisetGenerator() {
      @Override
      protected Multiset<String> create(String[] elements) {
        Multiset<String> multiset1 = LinkedHashMultiset.create();
        Multiset<String> multiset2 = LinkedHashMultiset.create();
        for (int i = 0; i < elements.length; i++) {
          String element = elements[i];
          if (multiset1.contains(element) ||
              multiset2.contains(element)) {
            // add to both; the one already containing it will have more
            multiset1.add(element);
            multiset2.add(element);
          } else if (i % 2 == 0) {
            multiset1.add(elements[i]);
          } else {
            multiset2.add(elements[i]);
          }
        }
        return Multisets.union(multiset1, multiset2);
      }
    };
  }

  private static TestStringMultisetGenerator intersectionGenerator() {
    return new TestStringMultisetGenerator() {
      @Override protected Multiset<String> create(String[] elements) {
        Multiset<String> multiset1 = LinkedHashMultiset.create();
        Multiset<String> multiset2 = LinkedHashMultiset.create();
        multiset1.add("only1");
        multiset2.add("only2");
        for (int i = 0; i < elements.length; i++) {
          multiset1.add(elements[i]);
          multiset2.add(elements[elements.length - 1 - i]);
        }
        if (elements.length > 0) {
          multiset1.add(elements[0]);
        }
        if (elements.length > 1) {
          /*
           * When a test requests a multiset with duplicates, our plan of
           * "add an extra item 0 to A and an extra item 1 to B" really means
           * "add an extra item 0 to A and B," which isn't what we want.
           */
          if (!Objects.equal(elements[0], elements[1])) {
            multiset2.add(elements[1], 2);
          }
        }
        return Multisets.intersection(multiset1, multiset2);
      }
    };
  }

  private static TestStringMultisetGenerator sumGenerator() {
    return new TestStringMultisetGenerator() {
      @Override protected Multiset<String> create(String[] elements) {
        Multiset<String> multiset1 = LinkedHashMultiset.create();
        Multiset<String> multiset2 = LinkedHashMultiset.create();
        for (int i = 0; i < elements.length; i++) {
          // add to either; sum should contain all
          if (i % 2 == 0) {
            multiset1.add(elements[i]);
          } else {
            multiset2.add(elements[i]);
          }
        }
        return Multisets.sum(multiset1, multiset2);
      }
    };
  }

  private static TestStringMultisetGenerator differenceGenerator() {
    return new TestStringMultisetGenerator() {
      @Override protected Multiset<String> create(String[] elements) {
        Multiset<String> multiset1 = LinkedHashMultiset.create();
        Multiset<String> multiset2 = LinkedHashMultiset.create();
        multiset1.add("equalIn1");
        multiset1.add("fewerIn1");
        multiset2.add("equalIn1");
        multiset2.add("fewerIn1", 3);
        multiset2.add("onlyIn2", 2);
        for (int i = 0; i < elements.length; i++) {
          // add 1 more copy of each element to multiset1 than multiset2
          multiset1.add(elements[i], i + 2);
          multiset2.add(elements[i], i + 1);
        }
        return Multisets.difference(multiset1, multiset2);
      }
    };
  }

  private static final Multiset<String> ELEMENTS_TO_FILTER_OUT = ImmutableMultiset.of(
      "foobar", "bazfoo", "foobar", "foobar");

  private static final Predicate<String> PREDICATE =
      Predicates.not(Predicates.in(ELEMENTS_TO_FILTER_OUT));

  private static TestStringMultisetGenerator filteredGenerator() {
    return new TestStringMultisetGenerator() {
      @Override
      protected Multiset<String> create(String[] elements) {
        Multiset<String> multiset = LinkedHashMultiset.create();
        Collections.addAll(multiset, elements);
        multiset.addAll(ELEMENTS_TO_FILTER_OUT);
        return Multisets.filter(multiset, PREDICATE);
      }

      @Override
      public List<String> order(List insertionOrder) {
        return Lists.newArrayList(LinkedHashMultiset.create(insertionOrder));
      }
    };
  }
}

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