org.specrunner.expressions.core
Class ExpressionJanino

java.lang.Object
  org.specrunner.expressions.core.AbstractExpression
      org.specrunner.expressions.core.ExpressionJanino

All Implemented Interfaces:

IExpression

public class ExpressionJanino
extends AbstractExpression

A Janino expression.

Author:

Thiago Santos

Field Summary

protected static ICache<ExpressionKey,org.codehaus.commons.compiler.IExpressionEvaluator>	cache Cache of expressions.
static String	FEATURE_JDK_COMPILER Feature to enable Janino work with JDK expressions ( org.codehaus.commons.compiler.jdk.ExpressionEvaluator).

Fields inherited from class org.specrunner.expressions.core.AbstractExpression

DEFAULT_PRECEDENCE

Fields inherited from interface org.specrunner.expressions.IExpression

FEATURE_PRECEDENCE

Constructor Summary

ExpressionJanino(IExpressionFactory parent, Object source)
Basic constructor.

Method Summary

protected Object	arguments(IContext context, String expression, List<String> args, List<Class<?>> types, List<Object> values, boolean silent) Prepare arguments.
protected Object	eval(Object source, String expression, List<String> args, List<Class<?>> types, List<Object> values, boolean silent) Evaluate the expression.
Object	evaluate(IContext context, boolean silent) Given a context, evaluates the expression.
protected Object	getValue(IContext context, String text, boolean silent) Get the value for a expression.
protected Number	numericValue(String original) Convert to number.
protected Object	tryObject(Class<?> returnType, String expression, String[] arrayArgs, Object[] arrayValues, Class<?>[] arrayTypes) Compute the expression assuming return type will be the specified.

Methods inherited from class org.specrunner.expressions.core.AbstractExpression

evaluate, getParent, getPrecedence, setPrecedence

Methods inherited from class java.lang.Object

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

Field Detail

FEATURE_JDK_COMPILER

public static final String FEATURE_JDK_COMPILER

Feature to enable Janino work with JDK expressions ( org.codehaus.commons.compiler.jdk.ExpressionEvaluator).

cache

protected static ICache<ExpressionKey,org.codehaus.commons.compiler.IExpressionEvaluator> cache

Cache of expressions.

Constructor Detail

ExpressionJanino

public ExpressionJanino(IExpressionFactory parent,
                        Object source)

Basic constructor.

Parameters:

parent - The parent factory.

source - The object source.

Method Detail

evaluate

public Object evaluate(IContext context,
                       boolean silent)
                throws ExpressionException

Description copied from interface: IExpression

Given a context, evaluates the expression.

Parameters:

context - A contextual information.

silent - true, for evaluation without exceptions, false, otherwise.

Returns:

The result of expression evaluation.

Throws:

ExpressionException - On evaluation errors.

arguments

protected Object arguments(IContext context,
                           String expression,
                           List<String> args,
                           List<Class<?>> types,
                           List<Object> values,
                           boolean silent)
                    throws ExpressionException

Prepare arguments.

Parameters:

context - The context.

expression - The expression.

args - The arguments.

types - The types.

values - The values.

silent - Silent option.

Returns:

The resulting object, null, otherwise.

Throws:

ExpressionException - On expression errors.

getValue

protected Object getValue(IContext context,
                          String text,
                          boolean silent)
                   throws ExpressionException

Get the value for a expression.

Parameters:

context - The context.

text - The expression.

silent - The silent mode.

Returns:

An object.

Throws:

ExpressionException - On expression errors.

eval

protected Object eval(Object source,
                      String expression,
                      List<String> args,
                      List<Class<?>> types,
                      List<Object> values,
                      boolean silent)
               throws ExpressionException

Evaluate the expression.

Parameters:

source - The expression source.

expression - The expression as string.

args - The arguments.

types - The argument types.

values - The argument values.

silent - Silent mode.

Returns:

The resulting object.

Throws:

ExpressionException - On evaluation errors.

tryObject

protected Object tryObject(Class<?> returnType,
                           String expression,
                           String[] arrayArgs,
                           Object[] arrayValues,
                           Class<?>[] arrayTypes)
                    throws Exception

Compute the expression assuming return type will be the specified.

Parameters:

returnType - The calling result type.

expression - The expression to be evaluated.

arrayArgs - The formal parameters.

arrayValues - The actual parameters.

arrayTypes - The argument types.

Returns:

The expression result.

Throws:

Exception - On processing errors.

numericValue

protected Number numericValue(String original)

Convert to number.

Parameters:

original - The text.

Returns:

The corresponding value.