Package net.vleo.timel

Class TimEL

java.lang.Object

net.vleo.timel.TimEL

public final class TimEL
extends Object

Convenience facade to use TimEL. You can use this class to compile and evaluate expressions:

 
 long now = new Date().getTime();

 // Assemble the evaluation interval as [now, now + 1 second)
 Interval interval = Interval.of(now, now + 1000L);

 // Compile the expression 1 + 1
 Expression<Double> expression = TimEL
         .getCompiler("1 + 1")
         .compileExpression(Types.getNumericDoubleType());

 // Iterate through the results
 TimeIterator<Double> itor = TimEL
         .getExecutor(expression)
         .evaluateFor(interval);

 // Since 1+1 is constant we'll have a single sample for the whole interval
 double v = itor.next().getValue();
 
 

Author:

Andrea Leofreddi

Method Summary

Modifier and Type	Method	Description
static <V> TimeIterator<V>	evaluate(Expression<V> expression, Interval interval)	Evaluate a compiled expression.
static CompilerBuilder	parse(String source)	Initiates the compilation of the given source.

Methods inherited from class java.lang.Object

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

Method Detail

parse

public static CompilerBuilder parse(String source)

Initiates the compilation of the given source. The method will return a compiler builder.

Parameters:

source - Source to parse

Returns:

The compiler builder

evaluate

public static <V> TimeIterator<V> evaluate(Expression<V> expression,
                                           Interval interval)

Evaluate a compiled expression. As the evaluation is performed lazily, one needs to pull the returned iterator to complete it. If more statements are provided, all but the last one are executed, and the last value iterator is returned.

Type Parameters:

V - Value Java type

Parameters:

expression - The expression to evaluate

interval - Evaluation interval

Returns:

Result iterator