/**
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.hadoop.yarn.server.resourcemanager.security;

import java.util.HashMap;
import java.util.Map;

public class RMAppSecurityMaterial<T extends RMAppSecurityManager.SecurityManagerMaterial> {
  private final Map<Class, T> securityMaterial;
  
  public RMAppSecurityMaterial() {
    securityMaterial = new HashMap<>();
  }
  
  public void addMaterial(T material) {
    if (material != null && !securityMaterial.containsKey(material.getClass())) {
      securityMaterial.put(material.getClass(), material);
    }
  }
  
  public T getMaterial(Class type) {
    return securityMaterial.<T>get(type);
  }
  
  public boolean isEmpty() {
    return securityMaterial.isEmpty();
  }
}
