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43 package net.java.html.json;
45 import java.lang.annotation.ElementType;
46 import java.lang.annotation.Retention;
47 import java.lang.annotation.RetentionPolicy;
48 import java.lang.annotation.Target;
50 /** Can be used in classes annotated with {@link Model} annotation to
51 * define a derived property. Value of derived property is based on values
52 * of {@link Property} as enumerated by {@link Model#properties()}.
54 * The name of the derived property is the name of the method. The arguments
55 * of the method must match names and types of some of the properties
56 * from {@link Model#properties()} list. As soon as one of these properties
57 * changes, the method is called to recompute its new value.
59 * Method's return type defines the type of the derived property. It may be
60 * any primitive type, {@link String}, {@link Enum enum type} or a
61 * type generated by {@link Model @Model} annotation. One may
62 * also return an array by returning a list of such (boxed) type
63 * (for example {@link java.util.List List}<{@link String}> or {@link java.util.List List}<{@link Integer}>).
65 * An example testing <a target="_blank" href="http://dew.apidesign.org/dew/#7545568">
66 * whether a number is a prime</a> using a {@link ComputedProperty} is available
69 * @author Jaroslav Tulach <jtulach@netbeans.org>
71 @Retention(RetentionPolicy.SOURCE)
72 @Target(ElementType.METHOD)
73 public @interface ComputedProperty {