/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.syncope.common.lib.types;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  
  public final class EntitlementsHolder {
  
      private static final Object MONITOR = new Object();
  
      private static EntitlementsHolder INSTANCE;
  
      public static EntitlementsHolder getInstance() {
          synchronized (MONITOR) {
              if (INSTANCE == null) {
                  INSTANCE = new EntitlementsHolder();
              }
          }
          return INSTANCE;
      }
  
      private final Set<String> values = Collections.synchronizedSet(new HashSet<>());
  
      private EntitlementsHolder() {
          // private constructor for singleton
      }
  
      public void addAll(final Collection<String> values) {
          this.values.addAll(values);
      }
  
      public Set<String> addFor(final String anyType) {
          Set<String> added = new HashSet<>();
  
          for (AnyEntitlement operation : AnyEntitlement.values()) {
              this.values.add(operation.getFor(anyType));
              added.add(operation.getFor(anyType));
          }
  
          return added;
      }
  
      public Set<String> removeFor(final String anyType) {
          Set<String> removed = new HashSet<>();
  
          for (AnyEntitlement operation : AnyEntitlement.values()) {
              this.values.remove(operation.getFor(anyType));
              removed.add(operation.getFor(anyType));
          }
  
          return removed;
      }
  
      public Set<String> getValues() {
          return Collections.unmodifiableSet(values);
      }
  }