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 @ 44198
History | View | Annotate | Download (2.28 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 org.gvsig.expressionevaluator.Function; |
9 |
import org.gvsig.expressionevaluator.Interpreter; |
10 |
import org.gvsig.expressionevaluator.Optimizer; |
11 |
import org.gvsig.expressionevaluator.Optimizer.FunctionOptimizer; |
12 |
|
13 |
public class ConcatOperator |
14 |
extends AbstractBinaryOperator
|
15 |
implements FunctionOptimizer
|
16 |
{ |
17 |
|
18 |
public static final String NAME = "||"; |
19 |
|
20 |
public ConcatOperator() {
|
21 |
super(Function.GROUP_STRING, NAME);
|
22 |
} |
23 |
|
24 |
@Override
|
25 |
public boolean allowConstantFolding() { |
26 |
return true; |
27 |
} |
28 |
|
29 |
@Override
|
30 |
public Object call(Interpreter interpreter, Object op1, Object op2) { |
31 |
return Objects.toString(op1, "")+Objects.toString(op2, ""); |
32 |
} |
33 |
|
34 |
@Override
|
35 |
public Code optimize(Optimizer optimizer, Caller caller) {
|
36 |
Code op1 = optimizer.optimize(caller.parameters().get(0));
|
37 |
Code op2 = optimizer.optimize(caller.parameters().get(1));
|
38 |
|
39 |
if ( op1.code() == Code.CONSTANT && op2.code() == Code.CONSTANT) {
|
40 |
Code newCode = optimizer.getCodeBuilder().constant( |
41 |
call( |
42 |
optimizer.getInterpreter(), |
43 |
((Constant)op1).value(), |
44 |
((Constant)op2).value() |
45 |
) |
46 |
); |
47 |
return newCode;
|
48 |
|
49 |
} else if ( op1.code() == Code.CONSTANT ) { |
50 |
String value = Objects.toString(((Constant)op1).value(), ""); |
51 |
if( StringUtils.isBlank(value) ) {
|
52 |
return op2;
|
53 |
} |
54 |
Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
55 |
return newCode;
|
56 |
|
57 |
} else if ( op2.code() == Code.CONSTANT ) { |
58 |
String value = Objects.toString(((Constant)op2).value(), ""); |
59 |
if( StringUtils.isBlank(value) ) {
|
60 |
return op1;
|
61 |
} |
62 |
Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
63 |
return newCode;
|
64 |
} |
65 |
|
66 |
return caller;
|
67 |
} |
68 |
|
69 |
} |