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
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| 1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.operator; |
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| 2 | |||
| 3 | 44139 | jjdelcerro | import java.util.Objects; |
| 4 | import org.apache.commons.lang3.StringUtils; |
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| 5 | 44010 | jjdelcerro | import org.gvsig.expressionevaluator.Code; |
| 6 | import org.gvsig.expressionevaluator.Code.Caller; |
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| 7 | import org.gvsig.expressionevaluator.Code.Constant; |
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| 8 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
| 9 | import org.gvsig.expressionevaluator.Interpreter; |
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| 10 | 44010 | jjdelcerro | import org.gvsig.expressionevaluator.Optimizer; |
| 11 | import org.gvsig.expressionevaluator.Optimizer.FunctionOptimizer; |
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| 12 | 43521 | jjdelcerro | |
| 13 | 44139 | jjdelcerro | public class ConcatOperator |
| 14 | 44010 | jjdelcerro | extends AbstractBinaryOperator
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| 15 | implements FunctionOptimizer
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| 16 | {
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| 17 | 44139 | jjdelcerro | |
| 18 | public static final String NAME = "||"; |
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| 19 | 43512 | jjdelcerro | |
| 20 | 44139 | jjdelcerro | public ConcatOperator() {
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| 21 | super(Function.GROUP_STRING, NAME);
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| 22 | 43512 | jjdelcerro | } |
| 23 | |||
| 24 | @Override
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| 25 | 44009 | jjdelcerro | public boolean allowConstantFolding() { |
| 26 | return true; |
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| 27 | } |
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| 28 | |||
| 29 | @Override
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| 30 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object op1, Object op2) { |
| 31 | 44139 | jjdelcerro | return Objects.toString(op1, "")+Objects.toString(op2, ""); |
| 32 | 43512 | jjdelcerro | } |
| 33 | 44010 | jjdelcerro | |
| 34 | @Override
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| 35 | public Code optimize(Optimizer optimizer, Caller caller) {
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| 36 | 44198 | jjdelcerro | Code op1 = optimizer.optimize(caller.parameters().get(0));
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| 37 | Code op2 = optimizer.optimize(caller.parameters().get(1));
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| 38 | 44010 | jjdelcerro | |
| 39 | if ( op1.code() == Code.CONSTANT && op2.code() == Code.CONSTANT) {
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| 40 | Code newCode = optimizer.getCodeBuilder().constant( |
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| 41 | call( |
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| 42 | optimizer.getInterpreter(), |
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| 43 | ((Constant)op1).value(), |
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| 44 | ((Constant)op2).value() |
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| 45 | ) |
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| 46 | ); |
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| 47 | return newCode;
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| 48 | |||
| 49 | } else if ( op1.code() == Code.CONSTANT ) { |
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| 50 | 44139 | jjdelcerro | String value = Objects.toString(((Constant)op1).value(), ""); |
| 51 | if( StringUtils.isBlank(value) ) {
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| 52 | return op2;
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| 53 | 44010 | jjdelcerro | } |
| 54 | Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
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| 55 | return newCode;
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| 56 | |||
| 57 | } else if ( op2.code() == Code.CONSTANT ) { |
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| 58 | 44139 | jjdelcerro | String value = Objects.toString(((Constant)op2).value(), ""); |
| 59 | if( StringUtils.isBlank(value) ) {
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| 60 | return op1;
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| 61 | 44010 | jjdelcerro | } |
| 62 | Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
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| 63 | return newCode;
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| 64 | } |
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| 65 | |||
| 66 | return caller;
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| 67 | } |
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| 68 | 43512 | jjdelcerro | |
| 69 | } |