svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / function / operator / ConcatOperator.java @ 44207
History | View | Annotate | Download (2.33 KB)
1 |
package org.gvsig.expressionevaluator.impl.function.operator; |
---|---|
2 |
|
3 |
import java.util.Objects; |
4 |
import org.apache.commons.lang3.StringUtils; |
5 |
import org.gvsig.expressionevaluator.Code; |
6 |
import org.gvsig.expressionevaluator.Code.Caller; |
7 |
import org.gvsig.expressionevaluator.Code.Constant; |
8 |
import static org.gvsig.expressionevaluator.ExpressionBuilder.OPERATOR_CONCAT; |
9 |
import org.gvsig.expressionevaluator.Function; |
10 |
import org.gvsig.expressionevaluator.Interpreter; |
11 |
import org.gvsig.expressionevaluator.Optimizer; |
12 |
import org.gvsig.expressionevaluator.Optimizer.FunctionOptimizer; |
13 |
|
14 |
public class ConcatOperator |
15 |
extends AbstractBinaryOperator
|
16 |
implements FunctionOptimizer
|
17 |
{ |
18 |
|
19 |
public ConcatOperator() {
|
20 |
super(Function.GROUP_STRING, OPERATOR_CONCAT, true); |
21 |
} |
22 |
|
23 |
@Override
|
24 |
public boolean allowConstantFolding() { |
25 |
return true; |
26 |
} |
27 |
|
28 |
@Override
|
29 |
public Object call(Interpreter interpreter, Object op1, Object op2) { |
30 |
return Objects.toString(op1, "")+Objects.toString(op2, ""); |
31 |
} |
32 |
|
33 |
@Override
|
34 |
public Code optimize(Optimizer optimizer, Caller caller) {
|
35 |
Code op1 = optimizer.optimize(caller.parameters().get(0));
|
36 |
Code op2 = optimizer.optimize(caller.parameters().get(1));
|
37 |
|
38 |
if ( op1.code() == Code.CONSTANT && op2.code() == Code.CONSTANT) {
|
39 |
Code newCode = optimizer.getCodeBuilder().constant( |
40 |
call( |
41 |
optimizer.getInterpreter(), |
42 |
((Constant)op1).value(), |
43 |
((Constant)op2).value() |
44 |
) |
45 |
); |
46 |
return newCode;
|
47 |
|
48 |
} else if ( op1.code() == Code.CONSTANT ) { |
49 |
String value = Objects.toString(((Constant)op1).value(), ""); |
50 |
if( StringUtils.isBlank(value) ) {
|
51 |
return op2;
|
52 |
} |
53 |
Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
54 |
return newCode;
|
55 |
|
56 |
} else if ( op2.code() == Code.CONSTANT ) { |
57 |
String value = Objects.toString(((Constant)op2).value(), ""); |
58 |
if( StringUtils.isBlank(value) ) {
|
59 |
return op1;
|
60 |
} |
61 |
Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
62 |
return newCode;
|
63 |
} |
64 |
|
65 |
return caller;
|
66 |
} |
67 |
|
68 |
} |