content: /*
   * Copyright (C) 2007 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.taobao.android.dx.rop.annotation;
  
  import com.taobao.android.dx.util.FixedSizeList;
  
  /**
   * List of {@link Annotations} instances.
   */
  public final class AnnotationsList
          extends FixedSizeList {
      /** {@code non-null;} immutable empty instance */
      public static final AnnotationsList EMPTY = new AnnotationsList(0);
  
      /**
       * Constructs an immutable instance which is the combination of
       * the two given instances. The two instances must each have the
       * same number of elements, and each pair of elements must contain
       * disjoint sets of types.
       *
       * @param list1 {@code non-null;} an instance
       * @param list2 {@code non-null;} the other instance
       * @return {@code non-null;} the combination
       */
      public static AnnotationsList combine(AnnotationsList list1,
              AnnotationsList list2) {
          int size = list1.size();
  
          if (size != list2.size()) {
              throw new IllegalArgumentException("list1.size() != list2.size()");
          }
  
          AnnotationsList result = new AnnotationsList(size);
  
          for (int i = 0; i < size; i++) {
              Annotations a1 = list1.get(i);
              Annotations a2 = list2.get(i);
              result.set(i, Annotations.combine(a1, a2));
          }
  
          result.setImmutable();
          return result;
      }
  
      /**
       * Constructs an instance. All indices initially contain {@code null}.
       *
       * @param size the size of the list
       */
      public AnnotationsList(int size) {
          super(size);
      }
  
      /**
       * Gets the element at the given index. It is an error to call
       * this with the index for an element which was never set; if you
       * do that, this will throw {@code NullPointerException}.
       *
       * @param n {@code >= 0, < size();} which index
       * @return {@code non-null;} element at that index
       */
      public Annotations get(int n) {
          return (Annotations) get0(n);
      }
  
      /**
       * Sets the element at the given index. The given element must be
       * immutable.
       *
       * @param n {@code >= 0, < size();} which index
       * @param a {@code null-ok;} the element to set at {@code n}
       */
      public void set(int n, Annotations a) {
          a.throwIfMutable();
          set0(n, a);
      }
  }
  