$ObjectType を使用したスキーマ詳細への動的参照

1public class DynamicObjectHandler {
2
3    // This class acts as a controller for the DynamicObjectViewer component
4    
5    private String objType;
6    private List<String> accessibleFields;
7
8    public sObject obj { 
9        get; 
10        set {
11	          setObjectType(value);
12	          discoverAccessibleFields(value);
13	          obj = reloadObjectWithAllFieldData();
14        } 
15    }
16    
17    // The sObject type as a string
18    public String getObjectType() {
19    	  return(this.objType);
20    }
21    public String setObjectType(sObject newObj) {
22        this.objType = newObj.getSObjectType().getDescribe().getName();
23        return(this.objType);
24    }
25    
26    // List of accessible fields on the sObject
27    public List<String> getAccessibleFields() {
28     	return(this.accessibleFields);
29    }
30    
31    private void discoverAccessibleFields(sObject newObj) {
32        this.accessibleFields = new List<String>();
33        Map<String, Schema.SobjectField> fields = 
34            newObj.getSObjectType().getDescribe().fields.getMap();
35        for (String s : fields.keySet()) {
36            if ((s != 'Name') && (fields.get(s).getDescribe().isAccessible())) {
37                this.accessibleFields.add(s);
38            }
39        }
40    }
41    
42    private sObject reloadObjectWithAllFieldData() {
43        String qid = ApexPages.currentPage().getParameters().get('id');
44        String theQuery = 'SELECT ' + joinList(getAccessibleFields(), ', ') + 
45                          ' FROM ' + getObjectType() + 
46                          ' WHERE Id = :qid';
47        return(Database.query(theQuery));    	
48    }
49    
50    // Join an Apex List of fields into a SELECT fields list string
51    private static String joinList(List<String> theList, String separator) {
52
53        if (theList == null)   { return null; }
54        if (separator == null) { separator = ''; }
55
56        String joined = '';
57        Boolean firstItem = true;
58        for (String item : theList) {
59            if(null != item) {
60                if(firstItem){ firstItem = false; }
61                else { joined += separator; }
62                joined += item;
63            }
64        }
65        return joined;
66    }
67}