IButtonMapper.java (stage 4)
0: import edu.gatech.cc.realjin.umiddle.mapper.DeviceMappingPolicy;
1: import edu.gatech.cc.realjin.umiddle.mapper.Mapper;
2: import edu.gatech.cc.realjin.umiddle.mapper.MapperException;
3: import java.util.HashMap;
4: import java.util.Map;
5: import org.w3c.dom.Node;
6:
7: public class IButtonMapper extends Mapper implements IButtonListener{
8: private Map policies = new HashMap();
9:
10: public IButtonMapper() {
11: IButtonReader reader = <the reader>;
12: reader.addIButtonListener(this); //this registers iButtonInserted and iButtonPulledOut in this class as hooks.
13: }
14:
15: protected void init() {} //we do nothing here
16: protected void stop() {} //we do nothing here
18:
19: public int map(DeviceMappingPolicy policy) throws MapperException {
20: String idOrType = parseIButton(policy.getPolicy());
21: policies.add(idOrType, policy);
22: return POSTPONED; // meaning that the translator instantiation will be done in the future.
23: }
24:
25: protected String getNamespaceURI() {
26: return "//edu.gatech.cc.umiddle.ibutton";
27: }
28:
29: private String parseIButton(Node node){
30: return <id or type contained in the node>; //use your favarite XML parser
31: }
32:
33: public void iButtonInserted(IButtonDevice button){
34: if(this ibutton is already mapped)
35: return;
36:
37: String id = button.getID();
38: String type = button.getType();
39: DeviceMappingPolicy policy = (DeviceMappingPolicy)policies.get(id);
40:
41: if(policy == null){ ////we don't have USDL document for this paraticular iButton
42: policy = (DeviceMappingPolicy)get(type);
43: if(policy == null) ////we don't have USDL document for this iButton type
44: return; ////don't map this device.
45: }
46:
47: try{
48: //export container device entity to uMiddle space
49: translator = new DeviceEntity(policy.getName());
50: IButtonTranslator t = <create translator for this (id, type)>;
51: //add this translator to the container device entity
52: dev.addService(dev.getServiceMappingPolicy().getName(), t);
53: }catch(Exception e){
54: System.err.println("iButtonMapper: failed to map "+id);
55: e.printStackTrace();
56: }
57: }
58:
59: public void iButtonPulledOut(IButtonDevice button){
60: //assuming there is only one Bluedot connected to this PC, the current translator
61: //is for this iButton.
62: translator.unexport(); //this makes the translator stop operation
63: }
64: }
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