/*
    * 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.shiro.util;
  
  import org.apache.shiro.authz.Permission;
  import org.apache.shiro.authz.permission.PermissionResolver;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.LinkedHashSet;
  import java.util.Set;
  
  
  /**
   * Utility class to help with String-to-Permission object resolution.
   *
   * @since 0.1
   */
  public class PermissionUtils {
  
      public static Set<Permission> resolveDelimitedPermissions(String s, PermissionResolver permissionResolver) {
          Set<String> permStrings = toPermissionStrings(s);
          return resolvePermissions(permStrings, permissionResolver);
      }
  
      public static Set<String> toPermissionStrings(String permissionsString) {
          String[] tokens = StringUtils.split(permissionsString);
          if (tokens != null && tokens.length > 0) {
              return new LinkedHashSet<String>(Arrays.asList(tokens));
          }
          return null;
      }
  
      public static Set<Permission> resolvePermissions(Collection<String> permissionStrings, PermissionResolver permissionResolver) {
          Set<Permission> permissions = new LinkedHashSet<Permission>(permissionStrings.size());
          for (String permissionString : permissionStrings) {
              permissions.add(permissionResolver.resolvePermission(permissionString));
          }
          return permissions;
      }
  }