guava-gwt/test-super/com/google/common/collect/super/com/google/common/collect/ConstrainedMapTest.java

/*
 * 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.collect.MapConstraintsTest.TestKeyException;
import com.google.common.collect.MapConstraintsTest.TestValueException;
import com.google.common.collect.testing.TestStringMapGenerator;

import junit.framework.TestCase;

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();

  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<String, String>[] 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;
  }
}