1 /*
2 * Copyright (c) 2011. 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 }