/**
    * 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.hadoop.hbase.client;
  
  import java.util.Map;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.classification.InterfaceStability;
  import org.apache.hadoop.hbase.exceptions.DeserializationException;
  import org.apache.hadoop.hbase.filter.Filter;
  import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
  import org.apache.hadoop.hbase.security.access.AccessControlConstants;
  import org.apache.hadoop.hbase.security.access.Permission;
  import org.apache.hadoop.hbase.security.visibility.Authorizations;
  import org.apache.hadoop.hbase.security.visibility.VisibilityConstants;
  import com.google.common.collect.ArrayListMultimap;
  import com.google.common.collect.ListMultimap;
  
  @InterfaceAudience.Public
  @InterfaceStability.Evolving
  public abstract class Query extends OperationWithAttributes {
    private static final String ISOLATION_LEVEL = "_isolationlevel_";
    protected Filter filter = null;
    protected int targetReplicaId = -1;
    protected Consistency consistency = Consistency.STRONG;
  
    /**
     * @return Filter
     */
    public Filter getFilter() {
      return filter;
    }
  
    /**
     * Apply the specified server-side filter when performing the Query.
     * Only {@link Filter#filterKeyValue(Cell)} is called AFTER all tests
     * for ttl, column match, deletes and max versions have been run.
     * @param filter filter to run on the server
     * @return this for invocation chaining
     */
    public Query setFilter(Filter filter) {
      this.filter = filter;
      return this;
    }
  
    /**
     * Sets the authorizations to be used by this Query
     * @param authorizations
     */
    public Query setAuthorizations(Authorizations authorizations) {
      this.setAttribute(VisibilityConstants.VISIBILITY_LABELS_ATTR_KEY, ProtobufUtil
          .toAuthorizations(authorizations).toByteArray());
      return this;
    }
  
    /**
     * @return The authorizations this Query is associated with.
     * @throws DeserializationException
     */
    public Authorizations getAuthorizations() throws DeserializationException {
      byte[] authorizationsBytes = this.getAttribute(VisibilityConstants.VISIBILITY_LABELS_ATTR_KEY);
      if (authorizationsBytes == null) return null;
      return ProtobufUtil.toAuthorizations(authorizationsBytes);
    }
  
    /**
     * @return The serialized ACL for this operation, or null if none
     */
    public byte[] getACL() {
      return getAttribute(AccessControlConstants.OP_ATTRIBUTE_ACL);
    }
  
    /**
     * @param user User short name
     * @param perms Permissions for the user
     */
    public Query setACL(String user, Permission perms) {
      setAttribute(AccessControlConstants.OP_ATTRIBUTE_ACL,
        ProtobufUtil.toUsersAndPermissions(user, perms).toByteArray());
      return this;
    }
  
    /**
     * @param perms A map of permissions for a user or users
    */
   public Query setACL(Map<String, Permission> perms) {
     ListMultimap<String, Permission> permMap = ArrayListMultimap.create();
     for (Map.Entry<String, Permission> entry : perms.entrySet()) {
       permMap.put(entry.getKey(), entry.getValue());
     }
     setAttribute(AccessControlConstants.OP_ATTRIBUTE_ACL,
       ProtobufUtil.toUsersAndPermissions(permMap).toByteArray());
     return this;
   }
 
   /**
    * Returns the consistency level for this operation
    * @return the consistency level
    */
   public Consistency getConsistency() {
     return consistency;
   }
 
   /**
    * Sets the consistency level for this operation
    * @param consistency the consistency level
    */
   public Query setConsistency(Consistency consistency) {
     this.consistency = consistency;
     return this;
   }
 
   /**
    * Specify region replica id where Query will fetch data from. Use this together with
    * {@link #setConsistency(Consistency)} passing {@link Consistency#TIMELINE} to read data from
    * a specific replicaId.
    * <br><b> Expert: </b>This is an advanced API exposed. Only use it if you know what you are doing
    * @param Id
    */
   public Query setReplicaId(int Id) {
     this.targetReplicaId = Id;
     return this;
   }
 
   /**
    * Returns region replica id where Query will fetch data from.
    * @return region replica id or -1 if not set.
    */
   public int getReplicaId() {
     return this.targetReplicaId;
   }
 
   /**
    * Set the isolation level for this query. If the
    * isolation level is set to READ_UNCOMMITTED, then
    * this query will return data from committed and
    * uncommitted transactions. If the isolation level
    * is set to READ_COMMITTED, then this query will return
    * data from committed transactions only. If a isolation
    * level is not explicitly set on a Query, then it
    * is assumed to be READ_COMMITTED.
    * @param level IsolationLevel for this query
    */
   public Query setIsolationLevel(IsolationLevel level) {
     setAttribute(ISOLATION_LEVEL, level.toBytes());
     return this;
   }
 
   /**
    * @return The isolation level of this query.
    * If no isolation level was set for this query object,
    * then it returns READ_COMMITTED.
    * @return The IsolationLevel for this query
    */
   public IsolationLevel getIsolationLevel() {
     byte[] attr = getAttribute(ISOLATION_LEVEL);
     return attr == null ? IsolationLevel.READ_COMMITTED :
                           IsolationLevel.fromBytes(attr);
   }
 }