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1   /*
2    * Copyright (c) 2010.  The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.expreval.expr.stringpattern;
22  
23  import org.apache.expreval.client.NullColumnValueException;
24  import org.apache.expreval.client.ResultMissingColumnException;
25  import org.apache.expreval.expr.node.GenericValue;
26  import org.apache.hadoop.hbase.hbql.client.HBqlException;
27  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
28  
29  import java.util.regex.Matcher;
30  import java.util.regex.Pattern;
31  
32  public class LikeStmt extends GenericStringPatternStmt {
33  
34      private Pattern pattern = null;
35  
36      public LikeStmt(final GenericValue arg0, final boolean not, final GenericValue arg1) {
37          super(arg0, not, arg1);
38      }
39  
40      private Pattern getPattern() {
41          return this.pattern;
42      }
43  
44      protected String getFunctionName() {
45          return "LIKE";
46      }
47  
48      public Boolean getValue(final HConnectionImpl conn, final Object object) throws HBqlException,
49                                                                                      ResultMissingColumnException,
50                                                                                      NullColumnValueException {
51          final String val = (String)this.getExprArg(0).getValue(conn, object);
52  
53          if (val == null)
54              throw new HBqlException("Null string for value in " + this.asString());
55  
56          final boolean patternConstant = this.getExprArg(1).isAConstant();
57  
58          if (!patternConstant || this.getPattern() == null) {
59  
60              final String pvalue = (String)this.getExprArg(1).getValue(conn, object);
61  
62              if (pvalue == null)
63                  throw new HBqlException("Null string for pattern in " + this.asString());
64  
65              this.pattern = Pattern.compile(pvalue);
66          }
67  
68          final Matcher m = this.getPattern().matcher(val);
69  
70          final boolean retval = m.matches();
71  
72          return (this.isNot()) ? !retval : retval;
73      }
74  }