org.makumba.list.functions
Class ValueFunction

java.lang.Object
  javax.servlet.jsp.tagext.TagSupport
      org.makumba.analyser.AnalysableElement
          org.makumba.analyser.AnalysableExpression
              org.makumba.list.functions.GenericListValueFunction
                  org.makumba.list.functions.ValueFunction

All Implemented Interfaces:

Serializable, IterationTag, JspTag, Tag

public class ValueFunction
extends GenericListValueFunction

Implements a mak:value() function, similar to the mak:value tag (ValueTag). The advantage of the function is that it can be used inside JSTL/EL statements, e.g. a c:if. The function provides just basic value computing, but not the advanced formatting that the ValueTag provides.

Version:

$Id: ValueFunction.java 5117 2010-05-18 17:18:03Z rosso_nero $

Author:

Rudolf Mayer

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.makumba.analyser.AnalysableElement

AnalysableElement.FilePositionElementComparator

Field Summary

Fields inherited from class org.makumba.analyser.AnalysableExpression

elData, expression, key, parent

Fields inherited from class org.makumba.analyser.AnalysableElement

ANALYSIS_STATE

Fields inherited from class javax.servlet.jsp.tagext.TagSupport

id, pageContext

Fields inherited from interface javax.servlet.jsp.tagext.IterationTag

EVAL_BODY_AGAIN

Fields inherited from interface javax.servlet.jsp.tagext.Tag

EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

Constructor Summary

ValueFunction()

Method Summary

void	analyze(PageCache pageCache) Performs analysis-time operations
String	getPrefix() Gets the prefix of the makumba EL expression, e.g.
Object	resolve(PageContext pc, PageCache pageCache) Resolves the expression at runtime
String	treatExpressionAtAnalysis(String expression) Modifies the expression before analysis.
static Object	value(String expr)

Methods inherited from class org.makumba.list.functions.GenericListValueFunction

computeKey, doEndAnalyze, getEnclosingList, getRunningListKey, getValueComputer, registerValueAtParentList, setKey

Methods inherited from class org.makumba.analyser.AnalysableExpression

checkNumberOfArguments, findParentWithClass, getElementData, getKey, getParent, setELDataAtAnalysis, setParent, treatELExpressionAtAnalysis

Methods inherited from class org.makumba.analyser.AnalysableElement

checkTagFound, discardJSPParsingData, getAnalyzedElementData, getCurrentBodyTagData, getElementAfter, getElementBefore, getPageCache, getPageCache, getRunningElementData, getTagByAttribute, getTagById, getThreadElementStack, initializeThread, keepAnalysisState, setAnalyzedElementData, setRunningElementData

Methods inherited from class javax.servlet.jsp.tagext.TagSupport

doAfterBody, doEndTag, doStartTag, findAncestorWithClass, getId, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue

Methods inherited from class java.lang.Object

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

Constructor Detail

ValueFunction

public ValueFunction()

Method Detail

analyze

public void analyze(PageCache pageCache)

Description copied from class: AnalysableExpression

Performs analysis-time operations

Specified by:

analyze in class AnalysableExpression

getPrefix

public String getPrefix()

Description copied from class: AnalysableExpression

Gets the prefix of the makumba EL expression, e.g. Value

Specified by:

getPrefix in class AnalysableExpression

Returns:

the prefix of this EL expression

resolve

public Object resolve(PageContext pc,
                      PageCache pageCache)
               throws LogicException

Description copied from class: AnalysableExpression

Resolves the expression at runtime

Specified by:

resolve in class AnalysableExpression

Throws:

LogicException

treatExpressionAtAnalysis

public String treatExpressionAtAnalysis(String expression)

Description copied from class: AnalysableExpression

Modifies the expression before analysis. This is necessary because the expression that comes from page analysis is not tailored to the specific expression we want to handle

Specified by:

treatExpressionAtAnalysis in class AnalysableExpression

Returns:

the expression value, trimmed down to what is necessary for this kind of EL expression evaluator

value

public static Object value(String expr)