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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 DelegateCaseWhen extends GenericCaseWhen {
35
36 public DelegateCaseWhen(final GenericValue arg0, final GenericValue arg1) {
37 super(null, arg0, arg1);
38 }
39
40 public Class<? extends GenericValue> validateTypes(final GenericValue parentExpr,
41 final boolean allowCollections) throws HBqlException {
42
43 this.validateParentClass(BooleanValue.class, this.getExprArg(0).validateTypes(this, false));
44 final Class<? extends GenericValue> valueType = this.getExprArg(1).validateTypes(this, false);
45
46 if (TypeSupport.isParentClass(StringValue.class, valueType))
47 this.setTypedExpr(new StringCaseWhen(this.getExprArg(0), this.getExprArg(1)));
48 else if (TypeSupport.isParentClass(NumberValue.class, valueType))
49 this.setTypedExpr(new NumberCaseWhen(this.getExprArg(0), this.getExprArg(1)));
50 else if (TypeSupport.isParentClass(DateValue.class, valueType))
51 this.setTypedExpr(new DateCaseWhen(this.getExprArg(0), this.getExprArg(1)));
52 else if (TypeSupport.isParentClass(BooleanValue.class, valueType))
53 this.setTypedExpr(new BooleanCaseWhen(this.getExprArg(0), this.getExprArg(1)));
54 else
55 this.throwInvalidTypeException(valueType);
56
57 return this.getTypedExpr().validateTypes(parentExpr, false);
58 }
59
60 public GenericValue getOptimizedValue() throws HBqlException {
61 this.optimizeAllArgs();
62 return this;
63 }
64
65 public Object getValue(final HConnectionImpl conn, final Object object) throws HBqlException,
66 ResultMissingColumnException,
67 NullColumnValueException {
68 return this.getTypedExpr().getValue(conn, object);
69 }
70 }