/*
    * 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 Doubles#asList(double[])}.
   *
   * @author Kevin Bourrillion
   */
  @GwtCompatible(emulated = true)
  public class DoubleArrayAsListTest extends TestCase {
  
    private static List<Double> asList(Double[] values) {
      double[] temp = new double[values.length];
      for (int i = 0; i < values.length; i++) {
        temp[i] = checkNotNull(values[i]);  // checkNotNull for GWT (do not optimize).
      }
      return Doubles.asList(temp);
    }
  
    @GwtIncompatible("suite")
    public static Test suite() {
      List<ListTestSuiteBuilder<Double>> builders =
          ImmutableList.of(
              ListTestSuiteBuilder.using(new DoublesAsListGenerator())
                  .named("Doubles.asList"),
  
              ListTestSuiteBuilder.using(new DoublsAsListHeadSubListGenerator())
                  .named("Doubles.asList, head subList"),
  
              ListTestSuiteBuilder.using(new DoublesAsListTailSubListGenerator())
                  .named("Doubles.asList, tail subList"),
  
              ListTestSuiteBuilder.using(new DoublesAsListMiddleSubListGenerator())
                  .named("Doubles.asList, middle subList")
          );
  
      TestSuite suite = new TestSuite();
      for (ListTestSuiteBuilder<Double> 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 DoublesAsListGenerator extends TestDoubleListGenerator {
      @Override protected List<Double> create(Double[] elements) {
        return asList(elements);
      }
    }
  
    public static final class DoublsAsListHeadSubListGenerator extends TestDoubleListGenerator {
      @Override protected List<Double> create(Double[] elements) {
        Double[] suffix = {Double.MIN_VALUE, Double.MAX_VALUE};
        Double[] all = concat(elements, suffix);
        return asList(all).subList(0, elements.length);
      }
    }
  
   public static final class DoublesAsListTailSubListGenerator extends TestDoubleListGenerator {
     @Override protected List<Double> create(Double[] elements) {
       Double[] prefix = {(double) 86, (double) 99};
       Double[] all = concat(prefix, elements);
       return asList(all).subList(2, elements.length + 2);
     }
   }
 
   public static final class DoublesAsListMiddleSubListGenerator extends TestDoubleListGenerator {
     @Override protected List<Double> create(Double[] elements) {
       Double[] prefix = {Double.MIN_VALUE, Double.MAX_VALUE};
       Double[] suffix = {(double) 86, (double) 99};
       Double[] all = concat(concat(prefix, elements), suffix);
       return asList(all).subList(2, elements.length + 2);
     }
   }
 
   private static Double[] concat(Double[] left, Double[] right) {
     Double[] result = new Double[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 TestDoubleListGenerator
       implements TestListGenerator<Double> {
     @Override
     public SampleElements<Double> samples() {
       return new SampleDoubles();
     }
 
     @Override
     public List<Double> create(Object... elements) {
       Double[] array = new Double[elements.length];
       int i = 0;
       for (Object e : elements) {
         array[i++] = (Double) e;
       }
       return create(array);
     }
 
     /**
      * Creates a new collection containing the given elements; implement this
      * method instead of {@link #create(Object...)}.
      */
     protected abstract List<Double> create(Double[] elements);
 
     @Override
     public Double[] createArray(int length) {
       return new Double[length];
     }
 
     /** Returns the original element list, unchanged. */
     @Override
     public List<Double> order(List<Double> insertionOrder) {
       return insertionOrder;
     }
   }
 
   public static class SampleDoubles extends SampleElements<Double> {
     public SampleDoubles() {
       super((double) 0, (double) 1, (double) 2, (double) 3, (double) 4);
     }
   }
 }