com.codemesh.terp.eval.executors
Class ComparableComparator

java.lang.Object
  com.codemesh.terp.api.Executor.AbstractExecutor<java.lang.Object>
      com.codemesh.terp.eval.executors.ComparableComparator

All Implemented Interfaces:

Executor<java.lang.Object>, BooleanExecutor

public class ComparableComparator
extends Executor.AbstractExecutor<java.lang.Object>
implements BooleanExecutor

A comparator for comparable objects.

Nested Class Summary

Nested classes/interfaces inherited from interface com.codemesh.terp.api.Executor

Executor.AbstractExecutor<T>, Executor.ForMethod

Constructor Summary

ComparableComparator(int op)
Creates a comparator instance for the given comparison operation.

Method Summary

java.lang.Object	execute(java.util.List<java.lang.Object> args, TerpEvaluator eval, TerpContext ctx) Performs the executor's action on the given arguments in the given context.
boolean	matches(java.util.List<java.lang.Object> args) Returns true if the executor applies to the given arguments.

Methods inherited from class com.codemesh.terp.api.Executor.AbstractExecutor

execute

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ComparableComparator

public ComparableComparator(int op)

Creates a comparator instance for the given comparison operation. Comparable comparators take an integer representing the comparison operation as input. This allows one type to represent the six different operations.

Parameters:

op - the comparison type.

Method Detail

matches

public boolean matches(java.util.List<java.lang.Object> args)

Returns true if the executor applies to the given arguments. Typically, your custom executor will implement this method to check for the proper number of arguments and the proper argument types.

Specified by:

matches in interface Executor<java.lang.Object>

Parameters:

args - the arguments passed to the executor.

Returns:

true if the executor knows how to handle the given arguments, false otherwise.

execute

public java.lang.Object execute(java.util.List<java.lang.Object> args,
                                TerpEvaluator eval,
                                TerpContext ctx)

Performs the executor's action on the given arguments in the given context. Typically, your custom executor will implement this method to provide its core functionality.

Specified by:

execute in interface Executor<java.lang.Object>

Parameters:

args - the arguments.

eval - the evaluator to use. Can frequently be null.

ctx - the context in which the execution occurs. Can frequently be null.

Returns:

the execution result.