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      1 /*
      2  * Copyright (C) 2009 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.collect.testing.google;
     18 
     19 import static com.google.common.base.Preconditions.checkNotNull;
     20 
     21 import com.google.common.annotations.GwtCompatible;
     22 import com.google.common.collect.ImmutableMap;
     23 import com.google.common.collect.ImmutableMap.Builder;
     24 import com.google.common.collect.testing.SampleElements;
     25 import com.google.common.collect.testing.TestCollectionGenerator;
     26 import com.google.common.collect.testing.TestListGenerator;
     27 import com.google.common.collect.testing.TestMapEntrySetGenerator;
     28 import com.google.common.collect.testing.TestStringSetGenerator;
     29 import com.google.common.collect.testing.TestUnhashableCollectionGenerator;
     30 import com.google.common.collect.testing.UnhashableObject;
     31 
     32 import java.util.Collection;
     33 import java.util.List;
     34 import java.util.Map.Entry;
     35 import java.util.Set;
     36 
     37 /**
     38  * Generators of different types of map and related collections, such as
     39  * keys, entries and values.
     40  *
     41  * @author Hayward Chan
     42  */
     43 @GwtCompatible
     44 public class MapGenerators {
     45 
     46   public static class ImmutableMapKeySetGenerator
     47       extends TestStringSetGenerator {
     48     @Override protected Set<String> create(String[] elements) {
     49       Builder<String, Integer> builder = ImmutableMap.builder();
     50       for (String key : elements) {
     51         builder.put(key, 4);
     52       }
     53       return builder.build().keySet();
     54     }
     55   }
     56 
     57   public static class ImmutableMapValuesGenerator
     58       implements TestCollectionGenerator<String> {
     59 
     60     @Override
     61     public SampleElements<String> samples() {
     62       return new SampleElements.Strings();
     63     }
     64 
     65     @Override
     66     public Collection<String> create(Object... elements) {
     67       Builder<Object, String> builder = ImmutableMap.builder();
     68       for (Object key : elements) {
     69         builder.put(key, String.valueOf(key));
     70       }
     71       return builder.build().values();
     72     }
     73 
     74     @Override
     75     public String[] createArray(int length) {
     76       return new String[length];
     77     }
     78 
     79     @Override
     80     public List<String> order(List<String> insertionOrder) {
     81       return insertionOrder;
     82     }
     83   }
     84 
     85   public static class ImmutableMapUnhashableValuesGenerator
     86       extends TestUnhashableCollectionGenerator<Collection<UnhashableObject>> {
     87 
     88     @Override public Collection<UnhashableObject> create(
     89         UnhashableObject[] elements) {
     90       Builder<Integer, UnhashableObject> builder = ImmutableMap.builder();
     91       int key = 1;
     92       for (UnhashableObject value : elements) {
     93         builder.put(key++, value);
     94       }
     95       return builder.build().values();
     96     }
     97   }
     98 
     99   public static class ImmutableMapEntrySetGenerator
    100       extends TestMapEntrySetGenerator<String, String> {
    101 
    102     public ImmutableMapEntrySetGenerator() {
    103       super(new SampleElements.Strings(), new SampleElements.Strings());
    104     }
    105 
    106     @Override public Set<Entry<String, String>> createFromEntries(
    107         Entry<String, String>[] entries) {
    108       Builder<String, String> builder = ImmutableMap.builder();
    109       for (Entry<String, String> entry : entries) {
    110         // This null-check forces NPE to be thrown for tests with null
    111         // elements.  Those tests aren't useful in testing entry sets
    112         // because entry sets never have null elements.
    113         checkNotNull(entry);
    114         builder.put(entry.getKey(), entry.getValue());
    115       }
    116       return builder.build().entrySet();
    117     }
    118   }
    119 
    120   public static class ImmutableMapValueListGenerator
    121       implements TestListGenerator<String> {
    122     @Override
    123     public SampleElements<String> samples() {
    124       return new SampleElements.Strings();
    125     }
    126 
    127     @Override
    128     public List<String> create(Object... elements) {
    129       Builder<Integer, String> builder = ImmutableMap.builder();
    130       for (int i = 0; i < elements.length; i++) {
    131         builder.put(i, toStringOrNull(elements[i]));
    132       }
    133       return builder.build().values().asList();
    134     }
    135 
    136     @Override
    137     public String[] createArray(int length) {
    138       return new String[length];
    139     }
    140 
    141     @Override
    142     public Iterable<String> order(List<String> insertionOrder) {
    143       return insertionOrder;
    144     }
    145   }
    146 
    147   private static String toStringOrNull(Object o) {
    148     return (o == null) ? null : o.toString();
    149   }
    150 }
    151