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Java example source code file (MapGenerators.java)

This example Java source code file (MapGenerators.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

entry, immutablemapvaluelistgenerator, integer, iterable, list, map, override, sampleelements, string, suppresswarnings, testenummapgenerator, teststringlistgenerator, teststringmapgenerator, unhashableobject, util

The MapGenerators.java Java example source code

/*
 * Copyright (C) 2009 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.google;

import static com.google.common.collect.testing.Helpers.mapEntry;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.common.collect.Ordering;
import com.google.common.collect.testing.AnEnum;
import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.TestEnumMapGenerator;
import com.google.common.collect.testing.TestListGenerator;
import com.google.common.collect.testing.TestStringListGenerator;
import com.google.common.collect.testing.TestStringMapGenerator;
import com.google.common.collect.testing.TestUnhashableCollectionGenerator;
import com.google.common.collect.testing.UnhashableObject;

import java.util.Arrays;
import java.util.Collection;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * Generators of different types of map and related collections, such as
 * keys, entries and values.
 *
 * @author Hayward Chan
 */
@GwtCompatible
public class MapGenerators {
  public static class ImmutableMapGenerator extends TestStringMapGenerator {
    @Override
    protected Map<String, String> create(Entry[] entries) {
      ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return builder.build();
    }
  }

  public static class ImmutableMapCopyOfGenerator extends TestStringMapGenerator {
    @Override
    protected Map<String, String> create(Entry[] entries) {
      Map<String, String> builder = Maps.newLinkedHashMap();
      for (Entry<String, String> entry : entries) {
        builder.put(entry.getKey(), entry.getValue());
      }
      return ImmutableMap.copyOf(builder);
    }
  }

  public static class ImmutableMapCopyOfEntriesGenerator extends TestStringMapGenerator {
    @Override
    protected Map<String, String> create(Entry[] entries) {
      return ImmutableMap.copyOf(Arrays.asList(entries));
    }
  }

  public static class ImmutableMapUnhashableValuesGenerator
      extends TestUnhashableCollectionGenerator<Collection {

    @Override
    public Collection<UnhashableObject> create(UnhashableObject[] elements) {
      ImmutableMap.Builder<Integer, UnhashableObject> builder = ImmutableMap.builder();
      int key = 1;
      for (UnhashableObject value : elements) {
        builder.put(key++, value);
      }
      return builder.build().values();
    }
  }

  public static class ImmutableMapKeyListGenerator extends TestStringListGenerator {
    @Override
    public List<String> create(String[] elements) {
      ImmutableMap.Builder<String, Integer> builder = ImmutableMap.builder();
      for (int i = 0; i < elements.length; i++) {
        builder.put(elements[i], i);
      }
      return builder.build().keySet().asList();
    }
  }

  public static class ImmutableMapValueListGenerator extends TestStringListGenerator {
    @Override
    public List<String> create(String[] elements) {
      ImmutableMap.Builder<Integer, String> builder = ImmutableMap.builder();
      for (int i = 0; i < elements.length; i++) {
        builder.put(i, elements[i]);
      }
      return builder.build().values().asList();
    }
  }

  public static class ImmutableMapEntryListGenerator
      implements TestListGenerator<Entry {

    @Override
    public SampleElements<Entry samples() {
      return new SampleElements<Entry(
          mapEntry("foo", 5),
          mapEntry("bar", 3),
          mapEntry("baz", 17),
          mapEntry("quux", 1),
          mapEntry("toaster", -2));
    }

    @SuppressWarnings("unchecked")
    @Override
    public Entry<String, Integer>[] createArray(int length) {
      return new Entry[length];
    }

    @Override
    public Iterable<Entry order(List> insertionOrder) {
      return insertionOrder;
    }

    @Override
    public List<Entry create(Object... elements) {
      ImmutableMap.Builder<String, Integer> builder = ImmutableMap.builder();
      for (Object o : elements) {
        @SuppressWarnings("unchecked")
        Entry<String, Integer> entry = (Entry) o;
        builder.put(entry);
      }
      return builder.build().entrySet().asList();
    }
  }

  public static class ImmutableEnumMapGenerator extends TestEnumMapGenerator {
    @Override
    protected Map<AnEnum, String> create(Entry[] entries) {
      Map<AnEnum, String> map = Maps.newHashMap();
      for (Entry<AnEnum, String> entry : entries) {
        // checkArgument(!map.containsKey(entry.getKey()));
        map.put(entry.getKey(), entry.getValue());
      }
      return Maps.immutableEnumMap(map);
    }
  }

  public static class ImmutableMapCopyOfEnumMapGenerator extends TestEnumMapGenerator {
    @Override
    protected Map<AnEnum, String> create(Entry[] entries) {
      EnumMap<AnEnum, String> map = new EnumMap(AnEnum.class);
      for (Entry<AnEnum, String> entry : entries) {
        map.put(entry.getKey(), entry.getValue());
      }
      return ImmutableMap.copyOf(map);
    }

    @Override
    public Iterable<Entry order(List> insertionOrder) {
      return new Ordering<Entry() {

        @Override
        public int compare(Entry<AnEnum, String> left, Entry right) {
          return left.getKey().compareTo(right.getKey());
        }
      }.sortedCopy(insertionOrder);
    }
  }

  private static String toStringOrNull(Object o) {
    return (o == null) ? null : o.toString();
  }
}

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