net.sf.oval.expression
Interface ExpressionLanguage

All Known Implementing Classes:

ExpressionLanguageBeanShellImpl, ExpressionLanguageGroovyImpl, ExpressionLanguageJavaScriptImpl, ExpressionLanguageJEXLImpl, ExpressionLanguageJRubyImpl, ExpressionLanguageMVELImpl, ExpressionLanguageOGNLImpl, ExpressionLanguageScriptEngineImpl

public interface ExpressionLanguage

Author:

Sebastian Thomschke

Method Summary

Object	evaluate(String expression, Map<String,?> values) Evaluates the given expression.
boolean	evaluateAsBoolean(String expression, Map<String,?> values) Evaluates the given expression and expects it to return a boolean.

Method Detail

evaluate

Object evaluate(String expression,
                Map<String,?> values)
                throws ExpressionEvaluationException

Evaluates the given expression.

Parameters:

expression - the expression to evaluate

values - context values passed to the interpreter

Returns:

the result of the expression evaluation

Throws:

ExpressionEvaluationException - in case of an invalid expression

evaluateAsBoolean

boolean evaluateAsBoolean(String expression,
                          Map<String,?> values)
                          throws ExpressionEvaluationException

Evaluates the given expression and expects it to return a boolean.

Parameters:

expression - the expression to evaluate

values - context values passed to the interpreter

Returns:

the result of the expression evaluation

Throws:

ExpressionEvaluationException - If an error during evaluation occurs or if the return value is not a boolean value.