|
1 package com.daffodilwoods.daffodildb.server.sql99.expression.booleanvalueexpression.predicates;
2
3 import com.daffodilwoods.daffodildb.server.sql99.common.*;
4 import com.daffodilwoods.daffodildb.server.sql99.expression.booleanvalueexpression.*;
5 import com.daffodilwoods.daffodildb.server.sql99.expression.rowvalueexpression.*;
6 import com.daffodilwoods.daffodildb.server.sql99.expression.stringvalueexpression.*;
7 import com.daffodilwoods.daffodildb.utils.field.*;
8 import com.daffodilwoods.database.resource.*;
9
10
18
19 public class CharacterPredicate extends PredicateAbstract implements predicate, OperatorConstants, _ComparisonPredicate {
20
21 private charactervalueexpression leftMatchValue;
22 private int operatorType;
23 private FieldBase rightPattern;
24
25 public CharacterPredicate(charactervalueexpression leftMatchValue0, int operatorType0, FieldBase rightPattern0, ColumnDetails[] columns0) {
26 leftMatchValue = leftMatchValue0;
27 operatorType = operatorType0;
28 rightPattern = rightPattern0;
29 columnDetails = columns0;
30 }
31
32 public double getCost(long rowCount, boolean index) throws DException {
33 switch (operatorType) {
34 case LESSTHAN:
35 rowCount *= CostFactorConstants.GREATERTHAN / 100;
36 case GREATERTHANEQUALTO:
37 rowCount *= CostFactorConstants.GREATERTHANEQUALTO / 100;
38 }
39 if (index) {
40 rowCount *= CostFactorConstants.INDEXPREDICATE / 100;
41 }
42 return rowCount;
43 }
44
45 public long getEstimatedRows(long noOfRows) throws DException {
46 switch (operatorType) {
47 case LESSTHAN:
48 return noOfRows * CostFactorConstants.GREATERTHAN / 100;
49 case GREATERTHANEQUALTO:
50 return noOfRows * CostFactorConstants.GREATERTHANEQUALTO / 100;
51 }
52 return noOfRows;
53 }
54
55 public int getPredicateType() throws DException {
56 return operatorType;
57 }
58
59 public Object  getValue() throws DException {
60 return rightPattern;
61 }
62
63 public Object run(Object object) throws com.daffodilwoods.database.resource.DException {
64 Object fieldBase1 = leftMatchValue.run(object);
65 int cmp = -1;
66 try {
67 cmp = comparator.compare(fieldBase1, rightPattern);
68 } catch (NullPointerException ex) {
69 comparator = getAppropriateComparator(fieldBase1, rightPattern, null);
70 cmp = comparator.compare(fieldBase1, rightPattern);
71 } catch (DException ex1) {
72 throw ex1;
73 }
74 return booleanResult[operatorType - 1][cmp + 2];
75 }
76
77 public AbstractRowValueExpression[] getChilds() {
78 AbstractRowValueExpression[] childs = new AbstractRowValueExpression[] { (AbstractRowValueExpression) (leftMatchValue)};
79 return childs;
80 }
81
82 public void setOperator(int Type) throws DException {
83 operatorType = Type;
84 }
85
86 public ColumnDetails[] getColumnDetails() throws DException {
87 return columnDetails;
88 }
89
90 public String toString() {
91 try {
92 return leftMatchValue + " " + getOperator(operatorType) + "'" + rightPattern.getObject() + "'";
93 } catch (DException ex) {
94 return null;
95 }
96 }
97
98 private String getOperator(int operatorType) {
99 switch (operatorType) {
100 case GREATERTHANEQUALTO:
101 return " >= ";
102 case LESSTHAN:
103 return " < ";
104 }
105 return operatorType + "";
106 }
107 }
108 |
Popular Tags |
Java API By Example, From Geeks To Geeks.