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 / GetattrFunction.java @ 44748
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1 | 44138 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.programming; |
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2 | 43512 | jjdelcerro | |
3 | 43939 | jjdelcerro | import java.lang.reflect.Field; |
4 | 43512 | jjdelcerro | import org.apache.commons.lang3.Range; |
5 | 44748 | jjdelcerro | import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_GETATTR; |
6 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
7 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
8 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
9 | 44366 | jjdelcerro | import org.gvsig.tools.dynobject.DynObject; |
10 | 43512 | jjdelcerro | |
11 | 43939 | jjdelcerro | public class GetattrFunction extends AbstractFunction { |
12 | 43512 | jjdelcerro | |
13 | 43939 | jjdelcerro | public GetattrFunction() {
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14 | 44748 | jjdelcerro | super(Function.GROUP_PROGRAMMING, FUNCTION_GETATTR, Range.is(2)); |
15 | 43512 | jjdelcerro | } |
16 | 44138 | jjdelcerro | |
17 | 43512 | jjdelcerro | @Override
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18 | 44138 | jjdelcerro | public boolean allowConstantFolding() { |
19 | return false; |
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20 | } |
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21 | |||
22 | @Override
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23 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
24 | 43939 | jjdelcerro | Object obj = getObject(args, 0); |
25 | String attrname = getStr(args,1); |
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26 | if( attrname == null ) { |
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27 | throw new NullPointerException("A attribute name was expected and a null was received"); |
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28 | 43512 | jjdelcerro | } |
29 | 43939 | jjdelcerro | if( obj==null ) { |
30 | throw new NullPointerException("An object pointer was expected to access attribute "+attrname+" and a null was received"); |
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31 | } |
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32 | 44366 | jjdelcerro | Object value;
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33 | if( obj instanceof DynObject ) { |
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34 | value = ((DynObject) obj).getDynValue(attrname); |
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35 | } else {
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36 | Class<?> theClass = obj.getClass();
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37 | Field field = theClass.getField(attrname);
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38 | value = field.get(obj); |
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39 | } |
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40 | 43939 | jjdelcerro | return value;
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41 | 43512 | jjdelcerro | } |
42 | |||
43 | } |