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1 package org.apache.slide.projector.processor.core;
2
3 import java.util.Map  ;
4 import java.util.logging.Logger ;
5
6 import org.apache.slide.projector.Context;
7 import org.apache.slide.projector.Processor;
8 import org.apache.slide.projector.Result;
9 import org.apache.slide.projector.descriptor.AnyValueDescriptor;
10 import org.apache.slide.projector.descriptor.ParameterDescriptor;
11 import org.apache.slide.projector.descriptor.ResultDescriptor;
12 import org.apache.slide.projector.descriptor.StateDescriptor;
13 import org.apache.slide.projector.i18n.DefaultMessage;
14 import org.apache.slide.projector.i18n.ParameterMessage;
15 import org.apache.slide.projector.value.NullValue;
16 import org.apache.slide.projector.value.Value;
17
18 public class Exists implements Processor {
19 private static Logger logger = Logger.getLogger(Exists.class.getName());
20
21 public final static String INPUT = "input";
22
23 public final static String TRUE = "true";
24 public final static String FALSE = "false";
25
26 private final static ResultDescriptor resultDescriptor = new ResultDescriptor(new StateDescriptor[]{
27 new StateDescriptor(TRUE, new DefaultMessage("exists/state/true")),
28 new StateDescriptor(FALSE, new DefaultMessage("exists/state/false"))
29 });
30 private final static ParameterDescriptor[] parameterDescriptor = new ParameterDescriptor[]{ new ParameterDescriptor(INPUT, new ParameterMessage("exists/input"), new AnyValueDescriptor(), NullValue.NULL) };
31
32
33 public Result process(Map parameter, Context context) throws Exception {
34 Value input = (Value)parameter.get(INPUT);
35 if ( input instanceof NullValue ) {
36 return new Result(FALSE);
37 }
38 return new Result(TRUE);
39 }
40
41 public ParameterDescriptor[] getParameterDescriptors() {
42 return parameterDescriptor;
43 }
44
45 public ResultDescriptor getResultDescriptor() {
46 return resultDescriptor;
47 }
48 } |
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