/*
    * Copyright (C) 2007 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.testing.testers;
  
  import static com.google.common.collect.testing.features.CollectionSize.ONE;
  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
  import static com.google.common.collect.testing.features.MapFeature.REJECTS_DUPLICATES_AT_CREATION;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.collect.testing.AbstractMapTester;
  import com.google.common.collect.testing.features.CollectionSize;
  import com.google.common.collect.testing.features.MapFeature;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.Map.Entry;
  
  /**
   * A generic JUnit test which tests creation (typically through a constructor or
   * static factory method) of a map. Can't be invoked directly; please see
   * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
   *
   * @author Chris Povirk
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  public class MapCreationTester<K, V> extends AbstractMapTester<K, V> {
    @MapFeature.Require(ALLOWS_NULL_KEYS)
    @CollectionSize.Require(absent = ZERO)
    public void testCreateWithNullKeySupported() {
      initMapWithNullKey();
      expectContents(createArrayWithNullKey());
    }
  
    @MapFeature.Require(absent = ALLOWS_NULL_KEYS)
    @CollectionSize.Require(absent = ZERO)
    public void testCreateWithNullKeyUnsupported() {
      try {
        initMapWithNullKey();
        fail("Creating a map containing a null key should fail");
      } catch (NullPointerException expected) {
      }
    }
  
    @MapFeature.Require(ALLOWS_NULL_VALUES)
    @CollectionSize.Require(absent = ZERO)
    public void testCreateWithNullValueSupported() {
      initMapWithNullValue();
      expectContents(createArrayWithNullValue());
    }
  
    @MapFeature.Require(absent = ALLOWS_NULL_VALUES)
    @CollectionSize.Require(absent = ZERO)
    public void testCreateWithNullValueUnsupported() {
      try {
        initMapWithNullValue();
        fail("Creating a map containing a null value should fail");
      } catch (NullPointerException expected) {
      }
    }
  
    @MapFeature.Require({ALLOWS_NULL_KEYS, ALLOWS_NULL_VALUES})
    @CollectionSize.Require(absent = ZERO)
    public void testCreateWithNullKeyAndValueSupported() {
      Entry<K, V>[] entries = createSamplesArray();
      entries[getNullLocation()] = entry(null, null);
      resetMap(entries);
      expectContents(entries);
    }
  
    @MapFeature.Require(value = ALLOWS_NULL_KEYS,
        absent = REJECTS_DUPLICATES_AT_CREATION)
    @CollectionSize.Require(absent = {ZERO, ONE})
    public void testCreateWithDuplicates_nullDuplicatesNotRejected() {
      expectFirstRemoved(getEntriesMultipleNullKeys());
    }
  
    @MapFeature.Require(absent = REJECTS_DUPLICATES_AT_CREATION)
    @CollectionSize.Require(absent = {ZERO, ONE})
    public void testCreateWithDuplicates_nonNullDuplicatesNotRejected() {
      expectFirstRemoved(getEntriesMultipleNonNullKeys());
    }
  
   @MapFeature.Require({ALLOWS_NULL_KEYS, REJECTS_DUPLICATES_AT_CREATION})
   @CollectionSize.Require(absent = {ZERO, ONE})
   public void testCreateWithDuplicates_nullDuplicatesRejected() {
     Entry<K, V>[] entries = getEntriesMultipleNullKeys();
     try {
       resetMap(entries);
       fail("Should reject duplicate null elements at creation");
     } catch (IllegalArgumentException expected) {
     }
   }
 
   @MapFeature.Require(REJECTS_DUPLICATES_AT_CREATION)
   @CollectionSize.Require(absent = {ZERO, ONE})
   public void testCreateWithDuplicates_nonNullDuplicatesRejected() {
     Entry<K, V>[] entries = getEntriesMultipleNonNullKeys();
     try {
       resetMap(entries);
       fail("Should reject duplicate non-null elements at creation");
     } catch (IllegalArgumentException expected) {
     }
   }
 
   private Entry<K, V>[] getEntriesMultipleNullKeys() {
     Entry<K, V>[] entries = createArrayWithNullKey();
     entries[0] = entry(null, entries[0].getValue());
     return entries;
   }
 
   private Entry<K, V>[] getEntriesMultipleNonNullKeys() {
     Entry<K, V>[] entries = createSamplesArray();
     entries[0] = entry(samples.e1.getKey(), samples.e0.getValue());
     return entries;
   }
 
   private void expectFirstRemoved(Entry<K, V>[] entries) {
     resetMap(entries);
 
     List<Entry<K, V>> expectedWithDuplicateRemoved =
         Arrays.asList(entries).subList(1, getNumElements());
     expectContents(expectedWithDuplicateRemoved);
   }
 }