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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.casestmt;
22  
23  import org.apache.expreval.client.NullColumnValueException;
24  import org.apache.expreval.client.ResultMissingColumnException;
25  import org.apache.expreval.expr.DelegateStmt;
26  import org.apache.expreval.expr.ExpressionType;
27  import org.apache.expreval.expr.node.GenericValue;
28  import org.apache.hadoop.hbase.hbql.client.HBqlException;
29  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
30  
31  public abstract class GenericCaseWhen extends DelegateStmt<GenericCaseWhen> {
32  
33      protected GenericCaseWhen(final ExpressionType type,
34                                final GenericValue arg0,
35                                final GenericValue arg1) {
36          super(type, arg0, arg1);
37      }
38  
39      public boolean getPredicateValue(final HConnectionImpl conn, final Object object) throws HBqlException,
40                                                                                               ResultMissingColumnException,
41                                                                                               NullColumnValueException {
42          return (Boolean)this.getExprArg(0).getValue(conn, object);
43      }
44  
45      public Object getValue(final HConnectionImpl conn, final Object object) throws HBqlException,
46                                                                                     ResultMissingColumnException,
47                                                                                     NullColumnValueException {
48          return this.getExprArg(1).getValue(conn, object);
49      }
50  
51      public String asString() {
52          return "WHEN " + this.getExprArg(0).asString() + " THEN " + this.getExprArg(1).asString() + " ";
53      }
54  }