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 @ 44750
History | View | Annotate | Download (1.8 KB)
1 | 44138 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.programming; |
---|---|---|---|
2 | 43512 | jjdelcerro | |
3 | 43939 | jjdelcerro | import java.lang.reflect.Field; |
4 | 43512 | jjdelcerro | import org.apache.commons.lang3.Range; |
5 | 44750 | jjdelcerro | import org.gvsig.expressionevaluator.AttributeHandler; |
6 | 44748 | jjdelcerro | import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_GETATTR; |
7 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
8 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
9 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
10 | 44366 | jjdelcerro | import org.gvsig.tools.dynobject.DynObject; |
11 | 43512 | jjdelcerro | |
12 | 43939 | jjdelcerro | public class GetattrFunction extends AbstractFunction { |
13 | 43512 | jjdelcerro | |
14 | 43939 | jjdelcerro | public GetattrFunction() {
|
15 | 44750 | jjdelcerro | super(
|
16 | Function.GROUP_PROGRAMMING, |
||
17 | FUNCTION_GETATTR, |
||
18 | Range.is(2),
|
||
19 | null,
|
||
20 | null,
|
||
21 | null,
|
||
22 | null,
|
||
23 | true
|
||
24 | ); |
||
25 | 43512 | jjdelcerro | } |
26 | 44138 | jjdelcerro | |
27 | 43512 | jjdelcerro | @Override
|
28 | 44138 | jjdelcerro | public boolean allowConstantFolding() { |
29 | return false; |
||
30 | } |
||
31 | |||
32 | @Override
|
||
33 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
34 | 43939 | jjdelcerro | Object obj = getObject(args, 0); |
35 | String attrname = getStr(args,1); |
||
36 | if( attrname == null ) { |
||
37 | throw new NullPointerException("A attribute name was expected and a null was received"); |
||
38 | 43512 | jjdelcerro | } |
39 | 43939 | jjdelcerro | if( obj==null ) { |
40 | throw new NullPointerException("An object pointer was expected to access attribute "+attrname+" and a null was received"); |
||
41 | } |
||
42 | 44366 | jjdelcerro | Object value;
|
43 | if( obj instanceof DynObject ) { |
||
44 | value = ((DynObject) obj).getDynValue(attrname); |
||
45 | 44750 | jjdelcerro | } else if( obj instanceof AttributeHandler ) { |
46 | value = ((AttributeHandler) obj).get(attrname); |
||
47 | 44366 | jjdelcerro | } else {
|
48 | Class<?> theClass = obj.getClass();
|
||
49 | Field field = theClass.getField(attrname);
|
||
50 | value = field.get(obj); |
||
51 | } |
||
52 | 43939 | jjdelcerro | return value;
|
53 | 43512 | jjdelcerro | } |
54 | |||
55 | } |