org.makumba.list.engine.valuecomputer
Class NullableValueComputer

java.lang.Object
  org.makumba.list.engine.valuecomputer.ValueComputer
      org.makumba.list.engine.valuecomputer.QueryValueComputer
          org.makumba.list.engine.valuecomputer.NullableValueComputer

 class NullableValueComputer
extends QueryValueComputer

The manager of a nullableValueQuery

Author:

Cristian Bogdan

Field Summary

(package private) static String[]

emptyQueryProps

Fields inherited from class org.makumba.list.engine.valuecomputer.QueryValueComputer

dummy, queryKey

Fields inherited from class org.makumba.list.engine.valuecomputer.ValueComputer

expr, parentKey, projectionIndex, type

Constructor Summary

NullableValueComputer(MultipleKey parentListKey, String nullableExpr, String expr, PageCache pageCache)
Makes a query that is identical to the parentQuery, but has expr as projection.

Method Summary

Object

getValue(PageContext pageContext) Checks if the iterationGroupData is longer than 1, and throws an exception if so.

Methods inherited from class org.makumba.list.engine.valuecomputer.QueryValueComputer

doEndAnalyze, getQueryKey, makeQueryAtAnalysis, runQuery

Methods inherited from class org.makumba.list.engine.valuecomputer.ValueComputer

getFormattedValue, getProjectionIndex, getType, getValueComputerAtAnalysis, isPointer, print

Methods inherited from class java.lang.Object

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

Field Detail

emptyQueryProps

static final String[] emptyQueryProps

Constructor Detail

NullableValueComputer

NullableValueComputer(MultipleKey parentListKey,
                      String nullableExpr,
                      String expr,
                      PageCache pageCache)

Makes a query that is identical to the parentQuery, but has expr as projection.

Parameters:

parentListKey - the key of the parent list

nullableExpr - the nullable expression

expr - the expression we use as projection

pageCache - the page cache of the current page

Method Detail

getValue

public Object getValue(PageContext pageContext)
                throws LogicException

Checks if the iterationGroupData is longer than 1, and throws an exception if so. Takes the first result (if any) otherwise.

Overrides:

getValue in class ValueComputer

Parameters:

running - the tag that is currently running

Returns:

the computed value

Throws:

LogicException