Method: Object(Type)

1: package de.fhdw.wtf.persistence.meta;
2:
3: /**
4: * A class to represent an object in the database. An object is identified by its type, which can be a user type or a
5: * base type and an Id which is unique.
6: *
7: */
8: public abstract class Object extends InstanceItem {
9:         
10:         /**
11:          * The Type of this Object. Could be a Base Type or an User Object.
12:          */
13:         private final Type instanceOf;
14:         
15:         /**
16:          * Protected superclass constructor which must be inherited by its subclasses.
17:          *
18:          * @param instanceOf
19:          * The Type of this Object.
20:          */
21:         protected Object(final Type instanceOf) {
22:                 this.instanceOf = instanceOf;
23:         }
24:         
25:         /**
26:          * Getter for the Type.
27:          *
28:          * @return Provides the Type of this Object.
29:          */
30:         public Type getInstanceOf() {
31:                 return this.instanceOf;
32:         }
33:         
34:         /**
35:          * A static factory Method for objects. It checks whether the the given Tuple of Object Id and type information is a
36:          * base type or not and creates a new object instance of this object.
37:          *
38:          * @param id
39:          * The Id of the object in the database.
40:          * @param instance_of
41:          * The type information of the Object.
42:          * @return Provides a new Instance of the given object. If its a BaseType a BaseTypeValue Class will be instantiated
43:          * otherwise a new user object will be instantiated.
44:          */
45:         public static Object checkForBaseTypes(final long id, final Type instance_of) {
46:                 if (instance_of.getId() == StringType.getInstance().getId()) {
47:                         return new StringValue(id);
48:                 } else if (instance_of.getId() == IntegerType.getInstance().getId()) {
49:                         return new IntegerValue(id);
50:                 } else {
51:                         return UserObject.init(id, instance_of);
52:                 }
53:         }
54:         
55:         @Override
56:         public String toString() {
57:                 return "(" + this.getId() + "," + this.getInstanceOf().toString() + ")";
58:         }
59:         
60: }