/*
    * Copyright (C) 2010 Atlassian
    *
    * 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.atlassian.jira.rest.client.api;
  
  import com.google.common.base.Objects;
  
  import javax.annotation.Nullable;
  import java.util.Collection;
  
  /**
   * Represents a resource which can be expandable - that is REST API is capable of sending just the number
   * of child resources or when the entity is expanded, also the child resources themselves
   *
   * @since v0.1
   */
  public class ExpandableProperty<T> {
      private final int size;
  
      public ExpandableProperty(int size) {
          this.size = size;
          items = null;
      }
  
      public ExpandableProperty(int size, @Nullable Collection<T> items) {
          this.size = size;
          this.items = items;
      }
  
      public ExpandableProperty(Collection<T> items) {
          this.size = items.size();
          this.items = items;
      }
  
      public int getSize() {
          return size;
      }
  
      @Nullable
      final private Collection<T> items;
  
      @Nullable
      public Iterable<T> getItems() {
          return items;
      }
  
      @Override
      public String toString() {
          return Objects.toStringHelper(this).
                  add("size", size).
                  add("items", items).
                  toString();
      }
  
  
      @Override
      public boolean equals(Object obj) {
          if (obj instanceof ExpandableProperty) {
              ExpandableProperty that = (ExpandableProperty) obj;
              return Objects.equal(this.size, that.size)
                      && Objects.equal(this.items, that.items);
          }
          return false;
      }
  
      @Override
      public int hashCode() {
          return Objects.hashCode(size, items);
      }
  }