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 / SubstOperator.java @ 44198
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| 1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.operator; |
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| 2 | |||
| 3 | 44010 | jjdelcerro | import org.gvsig.expressionevaluator.Code; |
| 4 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
| 5 | import org.gvsig.expressionevaluator.Interpreter; |
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| 6 | 44010 | jjdelcerro | import org.gvsig.expressionevaluator.Optimizer; |
| 7 | import org.gvsig.expressionevaluator.Optimizer.FunctionOptimizer; |
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| 8 | 43521 | jjdelcerro | |
| 9 | 44010 | jjdelcerro | public class SubstOperator |
| 10 | extends AbstractBinaryOperator
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| 11 | implements FunctionOptimizer
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| 12 | {
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| 13 | 44139 | jjdelcerro | public static final String NAME = "-"; |
| 14 | |||
| 15 | 43512 | jjdelcerro | public SubstOperator() {
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| 16 | 44139 | jjdelcerro | super(Function.GROUP_NUMERIC,NAME);
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| 17 | 43512 | jjdelcerro | } |
| 18 | |||
| 19 | @Override
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| 20 | 44009 | jjdelcerro | public boolean allowConstantFolding() { |
| 21 | return true; |
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| 22 | } |
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| 23 | |||
| 24 | @Override
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| 25 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object op1, Object op2) { |
| 26 | 43512 | jjdelcerro | int type = this.getType(op1, op2); |
| 27 | if( (type & TYPE_DOUBLE) == TYPE_DOUBLE ) {
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| 28 | double value = ((Number) op1).doubleValue() - ((Number) op2).doubleValue(); |
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| 29 | return value;
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| 30 | } |
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| 31 | if( (type & TYPE_FLOAT) == TYPE_FLOAT ) {
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| 32 | double value = ((Number) op1).floatValue() - ((Number) op2).floatValue(); |
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| 33 | return value;
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| 34 | } |
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| 35 | if( (type & TYPE_LONG) == TYPE_LONG ) {
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| 36 | long value = ((Number) op1).longValue() - ((Number) op2).longValue(); |
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| 37 | return value;
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| 38 | } |
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| 39 | if( (type & TYPE_INT) == TYPE_INT ) {
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| 40 | int value = ((Number) op1).intValue() - ((Number) op2).intValue(); |
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| 41 | return value;
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| 42 | } |
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| 43 | throw new IllegalArgumentException("Types not allowed in '"+name()+"' operand."); |
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| 44 | } |
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| 45 | 44010 | jjdelcerro | |
| 46 | @Override
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| 47 | public Code optimize(Optimizer optimizer, Code.Caller caller) {
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| 48 | 44198 | jjdelcerro | Code op1 = optimizer.optimize(caller.parameters().get(0));
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| 49 | Code op2 = optimizer.optimize(caller.parameters().get(1));
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| 50 | 44010 | jjdelcerro | |
| 51 | if ( op1.code() == Code.CONSTANT && op2.code() == Code.CONSTANT) {
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| 52 | Code newCode = optimizer.getCodeBuilder().constant( |
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| 53 | call( |
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| 54 | optimizer.getInterpreter(), |
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| 55 | ((Code.Constant)op1).value(), |
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| 56 | ((Code.Constant)op2).value() |
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| 57 | ) |
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| 58 | ); |
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| 59 | return newCode;
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| 60 | |||
| 61 | } else if ( op2.code() == Code.CONSTANT ) { |
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| 62 | Object value = ((Code.Constant)op2).value();
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| 63 | if( value instanceof Number ) { |
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| 64 | double n = ((Number) value).doubleValue(); |
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| 65 | if( n == 0 ) { |
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| 66 | return op1;
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| 67 | } |
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| 68 | } |
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| 69 | Code newCode = optimizer.getCodeBuilder().operator(caller.name(), op1, op2); |
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| 70 | return newCode;
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| 71 | } |
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| 72 | 43512 | jjdelcerro | |
| 73 | 44010 | jjdelcerro | return caller;
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| 74 | } |
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| 75 | |||
| 76 | 43512 | jjdelcerro | } |