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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.lib.aggagent.script 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.cougaar.lib.aggagent.script.PythUnaryPredicate

PythUnaryPredicate
public class PythUnaryPredicate implements UnaryPredicate(Code)
An implementation of UnaryPredicate that derives its functionality from a script written in the JPython language. A PythUnaryPredicate is configured in two stages: one is to declare a function or class, and the other is to pass the function or an instance of the class to the controlling Java context.

The necessity of using a two-stage initialization procedure for both types of PythUnaryPredicate implementations is due to JPython's resolute refusal to allow an expression to declare a new function or class (or, indeed, any multiline construct). One possibility is to use a "magic" function through which the Java and JPython contexts can communicate. For the sake of uniformity, this option is used here. The magic function is "instantiate", which the script should define in the global context as a no-arg function that returns either a UnaryPredicate instance or a function designed to act as the "execute" method of a UnaryPredicate.

This class implements the UnaryPredicate interface, and can be instantiated by calling the constructor or a static factory method, predicateFromScript().



Constructor Summary
public  PythUnaryPredicate(String script)
     Create a PythUnaryPredicate instance by using a script-generated UnaryPredicate as a delegate.

Method Summary
public  booleanexecute(Object o)
     An implementation of the execute method of interface UnaryPredicate.
public static  voidmain(String[] argv)
    
public static  UnaryPredicatepredicateFromScript(String script)
     Create a UnaryPredicate from a JPython script.


Constructor Detail
PythUnaryPredicate
public PythUnaryPredicate(String script)(Code)
Create a PythUnaryPredicate instance by using a script-generated UnaryPredicate as a delegate.
Parameters:
  script - the JPython script that defines the embodied functionality




Method Detail
execute
public boolean execute(Object o)(Code)
An implementation of the execute method of interface UnaryPredicate. The function is actually delegated to a script-generated implementation, which is fabricated in the constructor.
Parameters:
  o - an object to be tested true if and only if the object matches the predicate



main
public static void main(String[] argv)(Code)



predicateFromScript
public static UnaryPredicate predicateFromScript(String script)(Code)
Create a UnaryPredicate from a JPython script. There are two acceptable modes for the script. Either it must produce a JPython subclass of Java interface UnaryPredicate, or it must produce a JPython function that behaves like the method UnaryPredicate.execute (i.e., takes one argument and returns a JPython-style boolean result (which is really a number where zero denotes "false" and any other value denotes "true")). Either way, the script is required to define the magic function "instantiate()" to provide the function or predicate instance to the Java context.
Parameters:
  script - the executable script that declares classes and variables a UnaryPredicate instance derived from the JPython scripts



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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