001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.security.visibility.expression;
019
020import org.apache.yetus.audience.InterfaceAudience;
021
022@InterfaceAudience.Private
023public class LeafExpressionNode implements ExpressionNode {
024  public static final LeafExpressionNode OPEN_PARAN_NODE = new LeafExpressionNode("(");
025  public static final LeafExpressionNode CLOSE_PARAN_NODE = new LeafExpressionNode(")");
026
027  private String identifier;
028
029  public LeafExpressionNode(String identifier) {
030    this.identifier = identifier;
031  }
032
033  public String getIdentifier() {
034    return this.identifier;
035  }
036
037  @Override
038  public int hashCode() {
039    return this.identifier.hashCode();
040  }
041
042  @Override
043  public boolean equals(Object obj) {
044    if (obj instanceof LeafExpressionNode) {
045      LeafExpressionNode that = (LeafExpressionNode) obj;
046      return this.identifier.equals(that.identifier);
047    }
048    return false;
049  }
050
051  @Override
052  public String toString() {
053    return this.identifier;
054  }
055
056  @Override
057  public boolean isSingleNode() {
058    return true;
059  }
060
061  @Override
062  public LeafExpressionNode deepClone() {
063    LeafExpressionNode clone = new LeafExpressionNode(this.identifier);
064    return clone;
065  }
066}