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Java example source code file (ConstrainedMapTest.java)

This example Java source code file (ConstrainedMapTest.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

constrainedmapgenerator, entry, expected, gwtcompatible, hashmap, illegalargumentexception, map, mapconstraint, override, string, test_constraint, test_value, testconstraint, testsuite, util

The ConstrainedMapTest.java Java example source code

/*
 * Copyright (C) 2013 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 com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.MapConstraintsTest.TestKeyException;
import com.google.common.collect.MapConstraintsTest.TestValueException;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.TestStringMapGenerator;
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 junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Tests for {@link MapConstraints#constrainedMap}.
 *
 * @author Jared Levy
 * @author Louis Wasserman
 */
@GwtCompatible(emulated = true)
public class ConstrainedMapTest extends TestCase {

  private static final String TEST_KEY = "42";
  private static final String TEST_VALUE = "test";
  private static final MapConstraint<String, String> TEST_CONSTRAINT = new TestConstraint();

  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();
    suite.addTest(MapTestSuiteBuilder
        .using(new ConstrainedMapGenerator())
        .named("Maps.constrainedMap[HashMap]")
        .withFeatures(
            CollectionSize.ANY,
            MapFeature.ALLOWS_NULL_KEYS,
            MapFeature.ALLOWS_NULL_VALUES,
            MapFeature.ALLOWS_ANY_NULL_QUERIES,
            MapFeature.GENERAL_PURPOSE,
            CollectionFeature.SUPPORTS_ITERATOR_REMOVE)
        .createTestSuite());
    suite.addTestSuite(ConstrainedMapTest.class);
    return suite;
  }

  public void testPutWithForbiddenKeyForbiddenValue() {
    Map<String, String> map = MapConstraints.constrainedMap(
        new HashMap<String, String>(),
        TEST_CONSTRAINT);
    try {
      map.put(TEST_KEY, TEST_VALUE);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
      // success
    }
  }

  public void testPutWithForbiddenKeyAllowedValue() {
    Map<String, String> map = MapConstraints.constrainedMap(
        new HashMap<String, String>(),
        TEST_CONSTRAINT);
    try {
      map.put(TEST_KEY, "allowed");
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
      // success
    }
  }

  public void testPutWithAllowedKeyForbiddenValue() {
    Map<String, String> map = MapConstraints.constrainedMap(
        new HashMap<String, String>(),
        TEST_CONSTRAINT);
    try {
      map.put("allowed", TEST_VALUE);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
      // success
    }
  }

  public static final class ConstrainedMapGenerator extends TestStringMapGenerator {
    @Override
    protected Map<String, String> create(Entry[] entries) {
      Map<String, String> map = MapConstraints.constrainedMap(
          new HashMap<String, String>(),
          TEST_CONSTRAINT);
      for (Entry<String, String> entry : entries) {
        map.put(entry.getKey(), entry.getValue());
      }
      return map;
    }
  }

  private static final class TestConstraint implements MapConstraint<String, String> {
    @Override
    public void checkKeyValue(String key, String value) {
      if (TEST_KEY.equals(key)) {
        throw new TestKeyException();
      }
      if (TEST_VALUE.equals(value)) {
        throw new TestValueException();
      }
    }

    private static final long serialVersionUID = 0;
  }
}

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