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21 package org.apache.expreval.expr.calculation;
22
23 import org.apache.expreval.client.NullColumnValueException;
24 import org.apache.expreval.client.ResultMissingColumnException;
25 import org.apache.expreval.expr.Operator;
26 import org.apache.expreval.expr.TypeSupport;
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 DelegateCalculation extends GenericCalculation {
35
36 public DelegateCalculation(final GenericValue arg0, final Operator operator, final GenericValue arg1) {
37 super(null, arg0, operator, arg1);
38 }
39
40 public Class<? extends GenericValue> validateTypes(final GenericValue parentExpr,
41 final boolean allowCollections) throws HBqlException {
42
43 final Class<? extends GenericValue> type1 = this.getExprArg(0).validateTypes(this, false);
44 final Class<? extends GenericValue> type2 = this.getExprArg(1).validateTypes(this, false);
45
46 if (TypeSupport.isParentClass(StringValue.class, type1, type2))
47 this.setTypedExpr(new StringCalculation(this.getExprArg(0), this.getOperator(), this.getExprArg(1)));
48 else if (TypeSupport.isParentClass(NumberValue.class, type1, type2))
49 this.setTypedExpr(new NumberCalculation(this.getExprArg(0), this.getOperator(), this.getExprArg(1)));
50 else if (TypeSupport.isParentClass(DateValue.class, type1, type2))
51 this.setTypedExpr(new DateCalculation(this.getExprArg(0), this.getOperator(), this.getExprArg(1)));
52 else
53 this.throwInvalidTypeException(type1, type2);
54
55 return this.getTypedExpr().validateTypes(parentExpr, false);
56 }
57
58 public GenericValue getOptimizedValue() throws HBqlException {
59 this.optimizeAllArgs();
60 return !this.isAConstant() ? this : this.getTypedExpr().getOptimizedValue();
61 }
62
63 public Object getValue(final HConnectionImpl conn, final Object object) throws HBqlException,
64 ResultMissingColumnException,
65 NullColumnValueException {
66 return this.getTypedExpr().getValue(conn, object);
67 }
68 }