class Aggregate extends Val
Constructor and Description |
---|
Aggregate(AggregateListener listener,
Val arg)
Constructor.
|
Modifier and Type | Method and Description |
---|---|
void |
acceptVisit(ExpressionVisitor visitor)
Accept a visit from a tree visitor.
|
protected Collection |
eval(Collection candidates,
Object orig,
StoreContext ctx,
Object[] params)
Return a list of values resulting from evaluating each given
candidate.
|
protected Object |
eval(Object candidate,
Object orig,
StoreContext ctx,
Object[] params)
Return this value for the given candidate.
|
Class |
getType()
Return the expected type for this value, or
Object if
the type is unknown. |
boolean |
isAggregate()
Return true if this value is an aggregate.
|
void |
setImplicitType(Class type)
Set the implicit type of the value, based on how it is used in the
filter.
|
evaluate, evaluate, getAlias, getMetaData, getName, getPath, getSelectAs, isVariable, isXPath, setAlias, setMetaData
public Aggregate(AggregateListener listener, Val arg)
public boolean isAggregate()
Value
isAggregate
in interface Value
isAggregate
in class Val
public Class getType()
Value
Object
if
the type is unknown.public void setImplicitType(Class type)
Value
Object
from Value.getType()
.protected Object eval(Object candidate, Object orig, StoreContext ctx, Object[] params)
Val
protected Collection eval(Collection candidates, Object orig, StoreContext ctx, Object[] params)
Val
#eval(Object,Object,StoreContext,Map)
for
each instance and packs the return value into a new list. Aggregates
should override.public void acceptVisit(ExpressionVisitor visitor)
Value
acceptVisit
in interface Value
acceptVisit
in class Val
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