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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.TypeSupport;
26  import org.apache.expreval.expr.node.BooleanValue;
27  import org.apache.expreval.expr.node.DateValue;
28  import org.apache.expreval.expr.node.GenericValue;
29  import org.apache.expreval.expr.node.NumberValue;
30  import org.apache.expreval.expr.node.StringValue;
31  import org.apache.hadoop.hbase.hbql.client.HBqlException;
32  import org.apache.hadoop.hbase.hbql.impl.HConnectionImpl;
33  
34  public class DelegateCaseElse extends GenericCaseElse {
35  
36      public DelegateCaseElse(final GenericValue arg0) {
37          super(null, arg0);
38      }
39  
40      public Class<? extends GenericValue> validateTypes(final GenericValue parentExpr,
41                                                         final boolean allowCollections) throws HBqlException {
42  
43          final Class<? extends GenericValue> valueType = this.getExprArg(0).validateTypes(this, false);
44  
45          if (TypeSupport.isParentClass(StringValue.class, valueType))
46              this.setTypedExpr(new StringCaseElse(this.getExprArg(0)));
47          else if (TypeSupport.isParentClass(NumberValue.class, valueType))
48              this.setTypedExpr(new NumberCaseElse(this.getExprArg(0)));
49          else if (TypeSupport.isParentClass(DateValue.class, valueType))
50              this.setTypedExpr(new DateCaseElse(this.getExprArg(0)));
51          else if (TypeSupport.isParentClass(BooleanValue.class, valueType))
52              this.setTypedExpr(new BooleanCaseElse(this.getExprArg(0)));
53          else
54              this.throwInvalidTypeException(valueType);
55  
56          return this.getTypedExpr().validateTypes(parentExpr, false);
57      }
58  
59      public GenericValue getOptimizedValue() throws HBqlException {
60          this.optimizeAllArgs();
61          return !this.isAConstant() ? this : this.getTypedExpr().getOptimizedValue();
62      }
63  
64      public Object getValue(final HConnectionImpl conn, final Object object) throws HBqlException,
65                                                                                     ResultMissingColumnException,
66                                                                                     NullColumnValueException {
67          return this.getTypedExpr().getValue(conn, object);
68      }
69  }