/**
    * 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.security.visibility.expression;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  @InterfaceAudience.Private
  public class LeafExpressionNode implements ExpressionNode {
    public static final LeafExpressionNode OPEN_PARAN_NODE = new LeafExpressionNode("(");
    public static final LeafExpressionNode CLOSE_PARAN_NODE = new LeafExpressionNode(")");
  
    private String identifier;
  
    public LeafExpressionNode(String identifier) {
      this.identifier = identifier;
    }
  
    public String getIdentifier() {
      return this.identifier;
    }
  
    @Override
    public int hashCode() {
      return this.identifier.hashCode();
    }
  
    @Override
    public boolean equals(Object obj) {
      if (obj instanceof LeafExpressionNode) {
        LeafExpressionNode that = (LeafExpressionNode) obj;
        return this.identifier.equals(that.identifier);
      }
      return false;
    }
  
    @Override
    public String toString() {
      return this.identifier;
    }
  
    @Override
    public boolean isSingleNode() {
      return true;
    }
  
    public LeafExpressionNode deepClone() {
      LeafExpressionNode clone = new LeafExpressionNode(this.identifier);
      return clone;
    }
  }