/*
    * Copyright (C) 2008 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.primitives;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import com.google.common.annotations.GwtCompatible;
  import com.google.common.annotations.GwtIncompatible;
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.testing.ListTestSuiteBuilder;
  import com.google.common.collect.testing.SampleElements;
  import com.google.common.collect.testing.TestListGenerator;
  import com.google.common.collect.testing.features.CollectionFeature;
  import com.google.common.collect.testing.features.CollectionSize;
  import com.google.common.collect.testing.features.ListFeature;
  
  import junit.framework.Test;
  import junit.framework.TestCase;
  import junit.framework.TestSuite;
  
  import java.util.List;
  
  /**
   * Test suite covering {@link Chars#asList(char[])}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  public class CharArrayAsListTest extends TestCase {
  
    private static List<Character> asList(Character[] values) {
      char[] temp = new char[values.length];
      for (int i = 0; i < values.length; i++) {
        temp[i] = checkNotNull(values[i]);  // checkNotNull for GWT (do not optimize).
      }
      return Chars.asList(temp);
    }
  
    @GwtIncompatible("suite")
    public static Test suite() {
      List<ListTestSuiteBuilder<Character>> builders =
          ImmutableList.of(
              ListTestSuiteBuilder.using(new CharsAsListGenerator())
                  .named("Chars.asList"),
  
              ListTestSuiteBuilder.using(new CharsAsListHeadSubListGenerator())
                  .named("Chars.asList, head subList"),
  
              ListTestSuiteBuilder.using(new CharsAsListTailSubListGenerator())
                  .named("Chars.asList, tail subList"),
  
              ListTestSuiteBuilder.using(new CharsAsListMiddleSubListGenerator())
                  .named("Chars.asList, middle subList")
              );
  
      TestSuite suite = new TestSuite();
      for (ListTestSuiteBuilder<Character> builder : builders) {
        suite.addTest(
            builder
            .withFeatures(CollectionSize.ONE,
                          CollectionSize.SEVERAL,
                          CollectionFeature.RESTRICTS_ELEMENTS,
                          ListFeature.SUPPORTS_SET)
            .createTestSuite());
      }
      return suite;
    }
  
    // Test generators.  To let the GWT test suite generator access them, they need to be
    // public named classes with a public default constructor.
  
    public static final class CharsAsListGenerator extends TestCharListGenerator {
      @Override protected List<Character> create(Character[] elements) {
        return asList(elements);
      }
    }
  
    public static final class CharsAsListHeadSubListGenerator extends TestCharListGenerator {
      @Override protected List<Character> create(Character[] elements) {
        Character[] suffix = {Character.MIN_VALUE, Character.MAX_VALUE};
        Character[] all = concat(elements, suffix);
        return asList(all).subList(0, elements.length);
      }
    }
  
   public static final class CharsAsListTailSubListGenerator extends TestCharListGenerator {
     @Override protected List<Character> create(Character[] elements) {
       Character[] prefix = {(char) 86, (char) 99};
       Character[] all = concat(prefix, elements);
       return asList(all).subList(2, elements.length + 2);
     }
   }
 
   public static final class CharsAsListMiddleSubListGenerator extends TestCharListGenerator {
     @Override protected List<Character> create(Character[] elements) {
       Character[] prefix = {Character.MIN_VALUE, Character.MAX_VALUE};
       Character[] suffix = {(char) 86, (char) 99};
       Character[] all = concat(concat(prefix, elements), suffix);
       return asList(all).subList(2, elements.length + 2);
     }
   }
 
   private static Character[] concat(Character[] left, Character[] right) {
     Character[] result = new Character[left.length + right.length];
     System.arraycopy(left, 0, result, 0, left.length);
     System.arraycopy(right, 0, result, left.length, right.length);
     return result;
   }
 
   public static abstract class TestCharListGenerator
       implements TestListGenerator<Character> {
     @Override
     public SampleElements<Character> samples() {
       return new SampleChars();
     }
 
     @Override
     public List<Character> create(Object... elements) {
       Character[] array = new Character[elements.length];
       int i = 0;
       for (Object e : elements) {
         array[i++] = (Character) e;
       }
       return create(array);
     }
 
     /**
      * Creates a new collection containing the given elements; implement this
      * method instead of {@link #create(Object...)}.
      */
     protected abstract List<Character> create(Character[] elements);
 
     @Override
     public Character[] createArray(int length) {
       return new Character[length];
     }
 
     /** Returns the original element list, unchanged. */
     @Override
     public List<Character> order(List<Character> insertionOrder) {
       return insertionOrder;
     }
   }
 
   public static class SampleChars extends SampleElements<Character> {
     public SampleChars() {
       super((char) 0, (char) 1, (char) 2, (char) 3, (char) 4);
     }
   }
 }