/*
 * 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.collect.testing.testers;

import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.features.ListFeature.SUPPORTS_SET;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.ListFeature;

/**
 * A generic JUnit test which tests {@code set()} operations on a list. Can't be
 * invoked directly; please see
 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
 *
 * <p>This class is GWT compatible.
 *
 * @author George van den Driessche
 */
@GwtCompatible(emulated = true)
public class ListSetTester<E> extends AbstractListTester<E> {
  @ListFeature.Require(SUPPORTS_SET)
  @CollectionSize.Require(absent = ZERO)
  public void testSet() {
    doTestSet(samples.e3);
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @ListFeature.Require(SUPPORTS_SET)
  public void testSet_null() {
    doTestSet(null);
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @ListFeature.Require(SUPPORTS_SET)
  public void testSet_replacingNull() {
    E[] elements = createSamplesArray();
    int i = aValidIndex();
    elements[i] = null;
    collection = getSubjectGenerator().create(elements);

    doTestSet(samples.e3);
  }

  private void doTestSet(E newValue) {
    int index = aValidIndex();
    E initialValue = getList().get(index);
    assertEquals("set(i, x) should return the old element at position i.",
        initialValue, getList().set(index, newValue));
    assertEquals("After set(i, x), get(i) should return x",
        newValue, getList().get(index));
    assertEquals("set() should not change the size of a list.",
        getNumElements(), getList().size());
  }

  @ListFeature.Require(SUPPORTS_SET)
  public void testSet_indexTooLow() {
    try {
      getList().set(-1, samples.e3);
      fail("set(-1) should throw IndexOutOfBoundsException");
    } catch (IndexOutOfBoundsException expected) {
    }
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_SET)
  public void testSet_indexTooHigh() {
    int index = getNumElements();
    try {
      getList().set(index, samples.e3);
      fail("set(size) should throw IndexOutOfBoundsException");
    } catch (IndexOutOfBoundsException expected) {
    }
    expectUnchanged();
  }

  @CollectionSize.Require(absent = ZERO)
  @ListFeature.Require(absent = SUPPORTS_SET)
  public void testSet_unsupported() {
    try {
      getList().set(aValidIndex(), samples.e3);
      fail("set() should throw UnsupportedOperationException");
    } catch (UnsupportedOperationException expected) {
    }
    expectUnchanged();
  }

  @CollectionSize.Require(ZERO)
  @ListFeature.Require(absent = SUPPORTS_SET)
  public void testSet_unsupportedByEmptyList() {
    try {
      getList().set(0, samples.e3);
      fail("set() should throw UnsupportedOperationException "
          + "or IndexOutOfBoundsException");
    } catch (UnsupportedOperationException tolerated) {
    } catch (IndexOutOfBoundsException tolerated) {
    }
    expectUnchanged();
  }

  @CollectionSize.Require(absent = ZERO)
  @ListFeature.Require(SUPPORTS_SET)
  @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
  public void testSet_nullUnsupported() {
    try {
      getList().set(aValidIndex(), null);
      fail("set(null) should throw NullPointerException");
    } catch (NullPointerException expected) {
    }
    expectUnchanged();
  }

  private int aValidIndex() {
    return getList().size() / 2;
  }
}