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 / LetFunction.java @ 44207
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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 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
5 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
6 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.MutableSymbolTable; |
7 | import org.gvsig.expressionevaluator.SymbolTable; |
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8 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
9 | |||
10 | 43939 | jjdelcerro | public class LetFunction extends AbstractFunction { |
11 | 43512 | jjdelcerro | |
12 | 44138 | jjdelcerro | public static final String NAME = "LET"; |
13 | |||
14 | 43939 | jjdelcerro | public LetFunction() {
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15 | 44138 | jjdelcerro | super(Function.GROUP_PROGRAMMING,
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16 | NAME, |
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17 | 44098 | jjdelcerro | Range.is(2),
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18 | "Assigns the value indicated in the second argument to the variable indicated in the first argument.",
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19 | 44138 | jjdelcerro | NAME+"({{identifier_name}},value)",
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20 | 44098 | jjdelcerro | new String[]{ |
21 | "identifier_name - Name of the variable",
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22 | "value - Value to assign to the variable"
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23 | }, |
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24 | "Object",
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25 | false
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26 | ); |
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27 | 44138 | jjdelcerro | this.addAlias("SET"); |
28 | 43512 | jjdelcerro | } |
29 | 44138 | jjdelcerro | |
30 | 43512 | jjdelcerro | @Override
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31 | 44138 | jjdelcerro | public boolean allowConstantFolding() { |
32 | return false; |
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33 | } |
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34 | |||
35 | @Override
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36 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
37 | 43939 | jjdelcerro | String name = getStr(args,0); |
38 | Object obj = getObject(args, 1); |
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39 | if( name == null ) { |
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40 | throw new NullPointerException("A string with a variable name was expected and a null was received"); |
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41 | 43512 | jjdelcerro | } |
42 | 43939 | jjdelcerro | SymbolTable symbolTable = interpreter.getSymbolTable(); |
43 | if( symbolTable instanceof MutableSymbolTable ) { |
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44 | ((MutableSymbolTable)symbolTable).setVar(name, obj); |
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45 | } else {
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46 | throw new RuntimeException("A MutableSymbolTable is required for use let function."); |
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47 | } |
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48 | return obj;
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49 | 43512 | jjdelcerro | } |
50 | |||
51 | } |