de.intarsys.tools.expression

Class ProcessingDecorator

java.lang.Object

de.intarsys.tools.expression.ProcessingDecorator

All Implemented Interfaces:

IStringEvaluator

public class ProcessingDecorator
extends Object
implements IStringEvaluator

A decorating IStringEvaluator to add result processing support to an other embedded IStringEvaluator. The command to be performed is separated from the expression to be processed by a ":" character.

You can suffix the original expression by as many commands as you like, for example

 my ${var:*:dts}
 

will recursivly expand "var" and apply a conversion to a short time format afterwards.

Currently we support processing the evaluated result with the following command characters:

?[expression]

return the evaluated result if expression is true, null otherwise. Currently only expressions representing access to boolean arguments are supported

.

reflective access to the value returned by the decorated evaluation

#

perform the named functor (action) on the result

+

re - perform evaluation on the result one time

*

perform evaluation on the result until it is no longer changed (or null)

[char][formatting options]

perform the string formatting selected by the "char"

[empty]

perform the default string formatting

Field Summary

Fields

Modifier and Type	Field and Description
static String	ARG_SEPARATOR
static char	CLOSE_BRACE
static char	CODE_CONDITIONAL
static char	CODE_DEEPRECURSION
static char	CODE_FUNCTOR
static char	CODE_REFLECTION
static char	CODE_SHALLOWRECURSION
static char	OPEN_BRACE
static char	PROCESSING_SEPARATOR

Constructor Summary

Constructors

Constructor and Description
ProcessingDecorator(IStringEvaluator evaluator)

Method Summary

Methods

Modifier and Type	Method and Description
Object	evaluate(String expression, IArgs args) Evaluate an expression according to the syntax used by the implementor and return the result.
IStringEvaluator	getEvaluator()
static IFunctorRegistry	getFormattingFunctors()
IStringEvaluator	getRecursionEvaluator()
char	getSeparator()
String	getSeparatorString()
static void	setFormattingFunctors(IFunctorRegistry formattingFunctors)
void	setRecursionEvaluator(IStringEvaluator recursionEvaluator)
void	setSeparator(char separator)

Methods inherited from class java.lang.Object

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

Field Detail

PROCESSING_SEPARATOR

public static final char PROCESSING_SEPARATOR

See Also:

Constant Field Values

ARG_SEPARATOR

public static final String ARG_SEPARATOR

See Also:

Constant Field Values

CLOSE_BRACE

public static final char CLOSE_BRACE

See Also:

Constant Field Values

OPEN_BRACE

public static final char OPEN_BRACE

See Also:

Constant Field Values

CODE_REFLECTION

public static final char CODE_REFLECTION

See Also:

Constant Field Values

CODE_FUNCTOR

public static final char CODE_FUNCTOR

See Also:

Constant Field Values

CODE_DEEPRECURSION

public static final char CODE_DEEPRECURSION

See Also:

Constant Field Values

CODE_SHALLOWRECURSION

public static final char CODE_SHALLOWRECURSION

See Also:

Constant Field Values

CODE_CONDITIONAL

public static final char CODE_CONDITIONAL

See Also:

Constant Field Values

Constructor Detail

ProcessingDecorator

public ProcessingDecorator(IStringEvaluator evaluator)

Method Detail

getFormattingFunctors

public static IFunctorRegistry getFormattingFunctors()

setFormattingFunctors

public static void setFormattingFunctors(IFunctorRegistry formattingFunctors)

evaluate

public Object evaluate(String expression,
              IArgs args)
                throws EvaluationException

Description copied from interface: IStringEvaluator

Evaluate an expression according to the syntax used by the implementor and return the result.

Specified by:

evaluate in interface IStringEvaluator

Parameters:

expression - The expression to evaluate.

Returns:

The result object.

Throws:

EvaluationException - If we encounter a compile or runtime error.

getEvaluator

public IStringEvaluator getEvaluator()

getRecursionEvaluator

public IStringEvaluator getRecursionEvaluator()

getSeparator

public char getSeparator()

getSeparatorString

public String getSeparatorString()

setRecursionEvaluator

public void setRecursionEvaluator(IStringEvaluator recursionEvaluator)

setSeparator

public void setSeparator(char separator)