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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 import org.apache.hadoop.hbase.hbql.impl.InvalidTypeException;
34
35 public class DelegateCaseWhen extends GenericCaseWhen {
36
37 public DelegateCaseWhen(final GenericValue arg0, final GenericValue arg1) {
38 super(null, arg0, arg1);
39 }
40
41 public Class<? extends GenericValue> validateTypes(final GenericValue parentExpr,
42 final boolean allowCollections) throws HBqlException {
43
44 this.validateParentClass(BooleanValue.class, this.getExprArg(0).validateTypes(this, false));
45 final Class<? extends GenericValue> valueType = this.getExprArg(1).validateTypes(this, false);
46
47 if (TypeSupport.isParentClass(StringValue.class, valueType))
48 this.setTypedExpr(new StringCaseWhen(this.getExprArg(0), this.getExprArg(1)));
49 else if (TypeSupport.isParentClass(NumberValue.class, valueType))
50 this.setTypedExpr(new NumberCaseWhen(this.getExprArg(0), this.getExprArg(1)));
51 else if (TypeSupport.isParentClass(DateValue.class, valueType))
52 this.setTypedExpr(new DateCaseWhen(this.getExprArg(0), this.getExprArg(1)));
53 else if (TypeSupport.isParentClass(BooleanValue.class, valueType))
54 this.setTypedExpr(new BooleanCaseWhen(this.getExprArg(0), this.getExprArg(1)));
55 else
56 throw new InvalidTypeException(this.getInvalidTypeMsg(valueType));
57
58 return this.getTypedExpr().validateTypes(parentExpr, false);
59 }
60
61 public GenericValue getOptimizedValue() throws HBqlException {
62 this.optimizeAllArgs();
63 return this;
64 }
65
66 public Object getValue(final HConnectionImpl conn, final Object object) throws HBqlException,
67 ResultMissingColumnException,
68 NullColumnValueException {
69 return this.getTypedExpr().getValue(conn, object);
70 }
71 }