/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.amnesica.kryptey.inputmethod.latin.common;

import java.util.ArrayList;

/**
 * Utility methods for working with collections.
 */
public final class CollectionUtils {
  private CollectionUtils() {
    // This utility class is not publicly instantiable.
  }

  /**
   * Converts a sub-range of the given array to an ArrayList of the appropriate type.
   *
   * @param array Array to be converted.
   * @param start First index inclusive to be converted.
   * @param end   Last index exclusive to be converted.
   * @throws IllegalArgumentException if start or end are out of range or start &gt; end.
   */
  public static <E> ArrayList<E> arrayAsList(final E[] array, final int start,
                                             final int end) {
    if (start < 0 || start > end || end > array.length) {
      throw new IllegalArgumentException("Invalid start: " + start + " end: " + end
          + " with array.length: " + array.length);
    }

    final ArrayList<E> list = new ArrayList<>(end - start);
    for (int i = start; i < end; i++) {
      list.add(array[i]);
    }
    return list;
  }
}
