Class annotation used to assist in the creation of Externalizable classes.
The @ExternalizeMethods annotation instructs the compiler to execute an
AST transformation which adds writeExternal() and readExternal() methods
to a class and adds Externalizable to the interfaces which the class implements.
The writeExternal() method writes each property (and optionally field) of the class
while the readExternal() method will read each one back in the same order.
Properties or fields marked as transient are ignored.
This annotation is typically used in conjunction with the @ExternalizeMethods annotation but
most usually not directly but rather via @AutoExternalizable which is a shortcut for both annotations.
Example usage:
import groovy.transform.*
@ExternalizeMethods
class Person {
String first, last
List favItems
Date since
}
Which will create a class of the following form:
class Person implements Externalizable {
...
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(first)
out.writeObject(last)
out.writeObject(favItems)
out.writeObject(since)
}
public void readExternal(ObjectInput oin) {
first = (String) oin.readObject()
last = (String) oin.readObject()
favItems = (List) oin.readObject()
since = (Date) oin.readObject()
}
...
}
| Type | Name and Description |
|---|---|
String[] |
excludesComma separated list of property names to exclude from externalizing. |
boolean |
includeFieldsInclude fields as well as properties when externalizing. |
Comma separated list of property names to exclude from externalizing. For convenience, a String with comma separated names can be used in addition to an array (using Groovy's literal list notation) of String values. @default {}
Include fields as well as properties when externalizing. @default false