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 @ 45011
History | View | Annotate | Download (2.67 KB)
1 |
package org.gvsig.expressionevaluator.impl.function.programming; |
---|---|
2 |
|
3 |
import java.lang.reflect.Field; |
4 |
import org.apache.commons.lang3.Range; |
5 |
import org.gvsig.expressionevaluator.AttributeHandler; |
6 |
import org.gvsig.expressionevaluator.Code; |
7 |
import org.gvsig.expressionevaluator.Codes; |
8 |
import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_GETATTR; |
9 |
import org.gvsig.expressionevaluator.Formatter; |
10 |
import org.gvsig.expressionevaluator.Function; |
11 |
import org.gvsig.expressionevaluator.Interpreter; |
12 |
import org.gvsig.expressionevaluator.spi.AbstractFunction; |
13 |
import org.gvsig.tools.dynobject.DynObject; |
14 |
|
15 |
public class GetattrFunction extends AbstractFunction { |
16 |
|
17 |
public GetattrFunction() {
|
18 |
super(
|
19 |
Function.GROUP_PROGRAMMING, |
20 |
FUNCTION_GETATTR, |
21 |
Range.is(2),
|
22 |
null,
|
23 |
"GETATTR({{object}}, attribute_name_as_string)",
|
24 |
null,
|
25 |
null,
|
26 |
true
|
27 |
); |
28 |
} |
29 |
|
30 |
@Override
|
31 |
public boolean allowConstantFolding() { |
32 |
return false; |
33 |
} |
34 |
|
35 |
@Override
|
36 |
public Object call(Interpreter interpreter, Object[] args) throws Exception { |
37 |
Object obj = getObject(args, 0); |
38 |
String attrname = getStr(args,1); |
39 |
if( attrname == null ) { |
40 |
throw new NullPointerException("A attribute name was expected and a null was received"); |
41 |
} |
42 |
if( obj==null ) { |
43 |
throw new NullPointerException("An object pointer was expected to access attribute "+attrname+" and a null was received"); |
44 |
} |
45 |
Object value;
|
46 |
if( obj instanceof DynObject ) { |
47 |
value = ((DynObject) obj).getDynValue(attrname); |
48 |
} else if( obj instanceof AttributeHandler ) { |
49 |
value = ((AttributeHandler) obj).get(attrname); |
50 |
} else {
|
51 |
Class<?> theClass = obj.getClass();
|
52 |
Field field = theClass.getField(attrname);
|
53 |
value = field.get(obj); |
54 |
} |
55 |
return value;
|
56 |
} |
57 |
|
58 |
@Override
|
59 |
public String toString(Codes args, Formatter<Code> formatter) { |
60 |
StringBuilder builder = new StringBuilder(); |
61 |
Code arg0 = args.get(0);
|
62 |
Code arg1 = args.get(1);
|
63 |
if( arg0 instanceof Code.Identifier && arg1 instanceof Code.Identifier ) { |
64 |
builder.append(arg0.toString(formatter)); |
65 |
builder.append(".");
|
66 |
builder.append(arg1.toString()); |
67 |
} else {
|
68 |
builder.append(this.name());
|
69 |
builder.append("(");
|
70 |
builder.append(arg0.toString(formatter)); |
71 |
builder.append(", ");
|
72 |
builder.append(arg1.toString(formatter)); |
73 |
builder.append(")");
|
74 |
} |
75 |
return builder.toString();
|
76 |
} |
77 |
|
78 |
} |