/*
    * 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;
   }
 }