/**
    * Copyright 2014-2024 Bloomreach B.V. (<a href="http://www.bloomreach.com">http://www.bloomreach.com</a>)
    *
    * 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
    *
    *         <a href="http://www.apache.org/licenses/LICENSE-2.0">http://www.apache.org/licenses/LICENSE-2.0</a>
    *
   * 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 org.onehippo.forge.exdocpicker.impl.field.tree;
  
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  
  /**
   * Tree item expansion state data set.
   */
  class TreeItemExpansionSet implements Set<Serializable>, Serializable {
  
      private static final long serialVersionUID = 1L;
  
      private Set<Serializable> items = new HashSet<>();
      private boolean inversed;
  
      public void expandAll() {
          items.clear();
          inversed = true;
      }
  
      public void collapseAll() {
          items.clear();
          inversed = false;
      }
  
      @Override
      public boolean add(Serializable item) {
          if (inversed) {
              return items.remove(item);
          } else {
              return items.add(item);
          }
      }
  
      @Override
      public boolean remove(Object o) {
          if (inversed) {
              return items.add((Serializable) o);
          } else {
              return items.remove(o);
          }
      }
  
      @Override
      public boolean contains(Object o) {
          if (inversed) {
              return !items.contains(o);
          } else {
              return items.contains(o);
          }
      }
  
      @Override
      public void clear() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public int size() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public boolean isEmpty() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public <A> A[] toArray(A[] a) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public Iterator<Serializable> iterator() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public Object[] toArray() {
          throw new UnsupportedOperationException();
      }
 
     @Override
     public boolean containsAll(Collection<?> c) {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public boolean addAll(Collection<? extends Serializable> c) {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public boolean retainAll(Collection<?> c) {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public boolean removeAll(Collection<?> c) {
         throw new UnsupportedOperationException();
     }
 }