content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.client.quota;
  
  import com.google.common.collect.ImmutableMap;
  
  import java.util.Map;
  import java.util.Objects;
  
  /**
   * Data structure that stores and returns cache size in number of bytes associated with a
   * cache scope.
   */
  public class CacheQuota {
    /**
     * A predefined CacheQuota instance that sets NO limit.
     */
    public static final CacheQuota UNLIMITED = new CacheQuota() {
      @Override
      public long getQuota(CacheScope cacheScope) {
        return Long.MAX_VALUE;
      }
    };
  
    private final Map<CacheScope.Level, Long> mQuota;
  
    /**
     * @param quota a map from scope level to size in bytes
     */
    public CacheQuota(Map<CacheScope.Level, Long> quota) {
      mQuota = quota;
    }
  
    /**
     * Empty cache quota.
     */
    public CacheQuota() {
      this(ImmutableMap.of());
    }
  
    /**
     * @param cacheScope the scope to query
     * @return size of quota of this scope in bytes
     */
    public long getQuota(CacheScope cacheScope) {
      return mQuota.getOrDefault(cacheScope.level(), Long.MAX_VALUE);
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      CacheQuota that = (CacheQuota) o;
      return Objects.equals(mQuota, that.mQuota);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(mQuota);
    }
  }
  