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Java example source code file (ImmutableClassToInstanceMapTest.java)

This example Java source code file (ImmutableClassToInstanceMapTest.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

classtoinstancemap, entry, five, immutableclasstoinstancemap, impl, map, nullpointerexception, number, object, one, override, testclasstoinstancemapgenerator, testsuite, three, util

The ImmutableClassToInstanceMapTest.java Java example source code

/*
 * Copyright (C) 2009 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 com.google.common.collect.Maps.immutableEntry;

import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.TestMapGenerator;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import com.google.common.testing.SerializableTester;

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

import java.io.Serializable;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Unit test for {@link ImmutableClassToInstanceMap}.
 *
 * @author Kevin Bourrillion
 */
public class ImmutableClassToInstanceMapTest extends TestCase {
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTestSuite(ImmutableClassToInstanceMapTest.class);

    suite.addTest(
        MapTestSuiteBuilder.using(
                new TestClassToInstanceMapGenerator() {
                  // Other tests will verify what real, warning-free usage looks like
                  // but here we have to do some serious fudging
                  @Override
                  @SuppressWarnings("unchecked")
                  public Map<Class, Impl> create(Object... elements) {
                    ImmutableClassToInstanceMap.Builder<Impl> builder =
                        ImmutableClassToInstanceMap.builder();
                    for (Object object : elements) {
                      Entry<Class, Impl> entry = (Entry) object;
                      builder.put(entry.getKey(), entry.getValue());
                    }
                    return (Map) builder.build();
                  }
                })
            .named("ImmutableClassToInstanceMap")
            .withFeatures(
                MapFeature.REJECTS_DUPLICATES_AT_CREATION,
                MapFeature.RESTRICTS_KEYS,
                CollectionFeature.KNOWN_ORDER,
                CollectionSize.ANY,
                MapFeature.ALLOWS_ANY_NULL_QUERIES,
                CollectionFeature.SERIALIZABLE)
            .createTestSuite());

    return suite;
  }

  public void testSerialization_empty() {
    assertSame(ImmutableClassToInstanceMap.of(),
        SerializableTester.reserialize(ImmutableClassToInstanceMap.of()));
  }

  public void testCopyOf_map_empty() {
    Map<Class in = Collections.emptyMap();
    ClassToInstanceMap<Object> map = ImmutableClassToInstanceMap.copyOf(in);
    assertTrue(map.isEmpty());
    assertSame(map, ImmutableClassToInstanceMap.of());
    assertSame(map, ImmutableClassToInstanceMap.copyOf(map));
  }

  public void testOf_zero() {
    assertTrue(ImmutableClassToInstanceMap.of().isEmpty());
  }

  public void testOf_one() {
    ImmutableClassToInstanceMap<Number> map =
        ImmutableClassToInstanceMap.of(int.class, 1);
    assertEquals(1, map.size());
  }

  public void testCopyOf_map_valid() {
    Map<Class in = Maps.newHashMap();
    in.put(Number.class, 0);
    in.put(Double.class, Math.PI);
    ClassToInstanceMap<Number> map = ImmutableClassToInstanceMap.copyOf(in);
    assertEquals(2, map.size());

    Number zero = map.getInstance(Number.class);
    assertEquals(0, zero);

    Double pi = map.getInstance(Double.class);
    assertEquals(Math.PI, pi, 0.0);

    assertSame(map, ImmutableClassToInstanceMap.copyOf(map));
  }

  public void testCopyOf_map_nulls() {
    Map<Class nullKey = Collections.singletonMap(
        null, (Number) 1.0);
    try {
      ImmutableClassToInstanceMap.copyOf(nullKey);
      fail();
    } catch (NullPointerException expected) {
    }

    Map<? extends Class nullValue
        = Collections.singletonMap(Number.class, null);
    try {
      ImmutableClassToInstanceMap.copyOf(nullValue);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testCopyOf_imap_empty() {
    Map<Class in = Collections.emptyMap();
    ClassToInstanceMap<Object> map = ImmutableClassToInstanceMap.copyOf(in);
    assertTrue(map.isEmpty());
  }

  public void testCopyOf_imap_valid() {
    ImmutableMap<Class in
        = ImmutableMap.of(Number.class, 0, Double.class, Math.PI);
    ClassToInstanceMap<Number> map = ImmutableClassToInstanceMap.copyOf(in);
    assertEquals(2, map.size());

    Number zero = map.getInstance(Number.class);
    assertEquals(0, zero);

    Double pi = map.getInstance(Double.class);
    assertEquals(Math.PI, pi, 0.0);
  }

  public void testPrimitiveAndWrapper() {
    ImmutableClassToInstanceMap<Number> ictim
        = new ImmutableClassToInstanceMap.Builder<Number>()
            .put(Integer.class, 0)
            .put(int.class, 1)
            .build();
    assertEquals(2, ictim.size());

    assertEquals(0, (int) ictim.getInstance(Integer.class));
    assertEquals(1, (int) ictim.getInstance(int.class));
  }

  abstract static class TestClassToInstanceMapGenerator implements TestMapGenerator<Class, Impl> {

    @Override
    public Class[] createKeyArray(int length) {
      return new Class[length];
    }

    @Override
    public Impl[] createValueArray(int length) {
      return new Impl[length];
    }

    @Override
    public SampleElements<Entry samples() {
      return new SampleElements<Entry(
          immutableEntry((Class) One.class, new Impl(1)),
          immutableEntry((Class) Two.class, new Impl(2)),
          immutableEntry((Class) Three.class, new Impl(3)),
          immutableEntry((Class) Four.class, new Impl(4)),
          immutableEntry((Class) Five.class, new Impl(5)));
    }

    @Override
    @SuppressWarnings("unchecked")
    public Entry<Class, Impl>[] createArray(int length) {
      return new Entry[length];
    }

    @Override
    public Iterable<Entry order(List> insertionOrder) {
      return insertionOrder;
    }
  }

  private interface One {}

  private interface Two {}

  private interface Three {}

  private interface Four {}

  private interface Five {}

  static final class Impl implements One, Two, Three, Four, Five, Serializable {
    final int value;

    Impl(int value) {
      this.value = value;
    }

    @Override
    public boolean equals(Object obj) {
      return obj instanceof Impl && value == ((Impl) obj).value;
    }

    @Override
    public int hashCode() {
      return value;
    }

    @Override
    public String toString() {
      return Integer.toString(value);
    }
  }
}

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