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 / programming / CaseFunction.java @ 44592
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| 1 | 44138 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.programming; |
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| 2 | 43512 | jjdelcerro | |
| 3 | import org.apache.commons.lang3.Range; |
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| 4 | 44138 | jjdelcerro | import org.gvsig.expressionevaluator.Codes; |
| 5 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
| 6 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
| 7 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
| 8 | 44138 | jjdelcerro | import org.gvsig.tools.ToolsLocator; |
| 9 | import org.gvsig.tools.dataTypes.DataTypes; |
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| 10 | import org.gvsig.tools.dataTypes.DataTypesManager.Coercion; |
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| 11 | 43512 | jjdelcerro | |
| 12 | 44138 | jjdelcerro | public class CaseFunction extends AbstractFunction { |
| 13 | 43512 | jjdelcerro | |
| 14 | 44138 | jjdelcerro | public static final String NAME = "CASE"; |
| 15 | |||
| 16 | public CaseFunction() {
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| 17 | super(Function.GROUP_PROGRAMMING,
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| 18 | NAME, |
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| 19 | Range.between(2, Integer.MAX_VALUE), |
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| 20 | "",
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| 21 | 44098 | jjdelcerro | null,
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| 22 | 44138 | jjdelcerro | null,
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| 23 | 44098 | jjdelcerro | "Object",
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| 24 | false
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| 25 | 43939 | jjdelcerro | ); |
| 26 | 43512 | jjdelcerro | } |
| 27 | |||
| 28 | @Override
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| 29 | 43939 | jjdelcerro | public boolean useArgumentsInsteadObjects() { |
| 30 | return true; |
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| 31 | } |
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| 32 | |||
| 33 | @Override
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| 34 | 44138 | jjdelcerro | public boolean allowConstantFolding() { |
| 35 | return false; |
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| 36 | } |
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| 37 | |||
| 38 | @Override
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| 39 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
| 40 | 43939 | jjdelcerro | throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. |
| 41 | } |
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| 42 | |||
| 43 | @Override
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| 44 | 44138 | jjdelcerro | public Object call(Interpreter interpreter, Codes args) throws Exception { |
| 45 | // CASE(cond1, cond2, cond3,... condN, expr1, expr2, expr3... exprN, exprElse)
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| 46 | // 0 1 2 3 4 5 6
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| 47 | Coercion toBoolean = ToolsLocator.getDataTypesManager().getCoercion(DataTypes.BOOLEAN); |
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| 48 | int count;
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| 49 | int firstValue;
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| 50 | int elseValue;
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| 51 | |||
| 52 | if( (args.size() % 2) == 0) { |
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| 53 | count = args.size() / 2;
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| 54 | firstValue = count; |
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| 55 | elseValue = -1;
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| 56 | } else {
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| 57 | count = (args.size()-1) / 2; |
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| 58 | firstValue = count; |
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| 59 | elseValue = args.size()-1;
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| 60 | 43512 | jjdelcerro | } |
| 61 | 44138 | jjdelcerro | boolean needElse = true; |
| 62 | Object value = null; |
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| 63 | for( int n=0; n<count; n++ ) { |
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| 64 | Object condition_o = getObject(interpreter, args, n);
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| 65 | Boolean condition = (Boolean) toBoolean.coerce(condition_o); |
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| 66 | if( condition ) {
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| 67 | needElse = false;
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| 68 | value = getObject(interpreter, args, n+firstValue); |
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| 69 | } |
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| 70 | } |
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| 71 | if( needElse && elseValue>0 ) { |
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| 72 | value = getObject(interpreter, args, elseValue); |
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| 73 | } |
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| 74 | return value;
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| 75 | 43512 | jjdelcerro | } |
| 76 | |||
| 77 | } |