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 / NegOperator.java @ 44098
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| 1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.operator; |
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| 2 | |||
| 3 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
| 4 | import org.gvsig.expressionevaluator.Interpreter; |
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| 5 | 43512 | jjdelcerro | |
| 6 | 43521 | jjdelcerro | |
| 7 | 44098 | jjdelcerro | public class NegOperator extends AbstractUnaryOperator { |
| 8 | 43512 | jjdelcerro | |
| 9 | 44098 | jjdelcerro | public NegOperator() {
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| 10 | super(Function.GROUP_NUMERIC,"NEGATE"); |
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| 11 | 43512 | jjdelcerro | } |
| 12 | |||
| 13 | @Override
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| 14 | 44009 | jjdelcerro | public boolean allowConstantFolding() { |
| 15 | return true; |
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| 16 | } |
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| 17 | |||
| 18 | @Override
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| 19 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object arg) { |
| 20 | 44098 | jjdelcerro | if( !(arg instanceof Number) ) { |
| 21 | throw new IllegalArgumentException("NEGATE function require a number"); |
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| 22 | 43512 | jjdelcerro | } |
| 23 | 44098 | jjdelcerro | if( arg instanceof Double ) { |
| 24 | return -((Number)arg).doubleValue(); |
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| 25 | } |
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| 26 | if( arg instanceof Float ) { |
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| 27 | return -((Number)arg).floatValue(); |
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| 28 | } |
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| 29 | if( arg instanceof Long ) { |
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| 30 | return -((Number)arg).longValue(); |
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| 31 | } |
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| 32 | if( arg instanceof Integer ) { |
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| 33 | return -((Number)arg).intValue(); |
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| 34 | } |
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| 35 | return -((Number)arg).doubleValue(); |
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| 36 | 43512 | jjdelcerro | } |
| 37 | |||
| 38 | } |