1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements.  See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership.  The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License.  You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 package org.apache.hadoop.hbase.security.visibility.expression;
19 
20 import java.util.ArrayList;
21 import java.util.Collections;
22 import java.util.List;
23 
24 import org.apache.hadoop.hbase.classification.InterfaceAudience;
25 
26 @InterfaceAudience.Private
27 public class NonLeafExpressionNode implements ExpressionNode {
28   private Operator op;
29   private List<ExpressionNode> childExps = new ArrayList<ExpressionNode>(2);
30 
NonLeafExpressionNode()31   public NonLeafExpressionNode() {
32 
33   }
34 
NonLeafExpressionNode(Operator op)35   public NonLeafExpressionNode(Operator op) {
36     this.op = op;
37   }
38 
NonLeafExpressionNode(Operator op, List<ExpressionNode> exps)39   public NonLeafExpressionNode(Operator op, List<ExpressionNode> exps) {
40     this.op = op;
41     if (op == Operator.NOT && exps.size() > 1) {
42       throw new IllegalArgumentException(Operator.NOT + " should be on 1 child expression");
43     }
44     this.childExps = exps;
45   }
46 
NonLeafExpressionNode(Operator op, ExpressionNode... exps)47   public NonLeafExpressionNode(Operator op, ExpressionNode... exps) {
48     this.op = op;
49     List<ExpressionNode> expLst = new ArrayList<ExpressionNode>();
50     Collections.addAll(expLst, exps);
51     this.childExps = expLst;
52   }
53 
getOperator()54   public Operator getOperator() {
55     return op;
56   }
57 
getChildExps()58   public List<ExpressionNode> getChildExps() {
59     return childExps;
60   }
61 
addChildExp(ExpressionNode exp)62   public void addChildExp(ExpressionNode exp) {
63     if (op == Operator.NOT && this.childExps.size() == 1) {
64       throw new IllegalStateException(Operator.NOT + " should be on 1 child expression");
65     }
66     this.childExps.add(exp);
67   }
68 
addChildExps(List<ExpressionNode> exps)69   public void addChildExps(List<ExpressionNode> exps) {
70     this.childExps.addAll(exps);
71   }
72 
73   @Override
toString()74   public String toString() {
75     StringBuilder sb = new StringBuilder("(");
76     if (this.op == Operator.NOT) {
77       sb.append(this.op);
78     }
79     for (int i = 0; i < this.childExps.size(); i++) {
80       sb.append(childExps.get(i));
81       if (i < this.childExps.size() - 1) {
82         sb.append(" " + this.op + " ");
83       }
84     }
85     sb.append(")");
86     return sb.toString();
87   }
88 
89   @Override
isSingleNode()90   public boolean isSingleNode() {
91     return this.op == Operator.NOT;
92   }
93 
deepClone()94   public NonLeafExpressionNode deepClone() {
95     NonLeafExpressionNode clone = new NonLeafExpressionNode(this.op);
96     for (ExpressionNode exp : this.childExps) {
97       clone.addChildExp(exp.deepClone());
98     }
99     return clone;
100   }
101 }
102