ariba.util.fieldvalue
Class ExpressionEvaluator

java.lang.Object
  ariba.util.fieldvalue.ExpressionEvaluator

Direct Known Subclasses:

AribaExprEvaluator

public abstract class ExpressionEvaluator
extends Object

Abstraction of a factory class for creating Expressions.

Constructor Summary

ExpressionEvaluator()

Method Summary

abstract Expression	compile(String stringRepresentation) Creates, compiles and returns a new Expression based off the supplied stringRepresentation.
Object	evaluate(String expression, Object object) Evaluate the given expression against the specified object.
Object	evaluate(String expression, Object object, FieldValue fieldvalue) Evaluate the given expression against the specified object.
Collection	getFieldPaths(String expression) Given an expression, return the field paths.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionEvaluator

public ExpressionEvaluator()

Method Detail

compile

public abstract Expression compile(String stringRepresentation)
                            throws ExpressionException

Creates, compiles and returns a new Expression based off the supplied stringRepresentation.

Throws:

ExpressionException

getFieldPaths

public final Collection getFieldPaths(String expression)
                               throws ExpressionException

Given an expression, return the field paths.

Parameters:

expression - the specified expression, must not be null

Returns:

a list of field paths represented as Strings.

Throws:

ExpressionEvaluatorException

ExpressionException

evaluate

public final Object evaluate(String expression,
                             Object object,
                             FieldValue fieldvalue)
                      throws ExpressionException

Evaluate the given expression against the specified object.

Parameters:

expression - the expression to evaluate, must not be null

object - the specified object to apply the expression to, must not be null

fieldvalue - an optional field value insance that can be used to evaluate the given expression. Can be null condition, false otherwise

Returns:

the evaluated result

Throws:

ExpressionEvaluatorException

ExpressionException

evaluate

public final Object evaluate(String expression,
                             Object object)
                      throws ExpressionEvaluatorException

Evaluate the given expression against the specified object. This is equivalent to calling evaluate(String, Object, null)

Parameters:

expression - the expression to evaluate, must not be null

object - the specified object to apply the expression to, must not be null

Returns:

the evaluated result

Throws:

ExpressionEvaluatorException