org.apache.openjpa.jdbc.kernel.exps
Class Aggregate

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.AbstractVal
      org.apache.openjpa.jdbc.kernel.exps.Aggregate

All Implemented Interfaces:

Serializable, Val, Value

 class Aggregate
extends AbstractVal

Aggregate listener that evaluates to a value.

Author:

Abe White

Field Summary

Fields inherited from class org.apache.openjpa.jdbc.kernel.exps.AbstractVal

FALSE, TRUE

Fields inherited from interface org.apache.openjpa.jdbc.kernel.exps.Val

ABS_VAL, ARGS_VAL, CMP_EQUAL, COALESCE_VAL, CONCAT_VAL, FORCE_OUTER, GENERALCASE_VAL, INDEXOF_VAL, JOIN_REL, LENGTH_VAL, LOCATE_VAL, LOWER_VAL, MATH_VAL, NULL_CMP, NULLIF_VAL, SIMPLECASE_VAL, SQRT_VAL, SUBSTRING_VAL, TRIM_VAL, UPPER_VAL, VAL, WHENCONDITION_VAL, WHENSCALAR_VAL

Constructor Summary

Aggregate(JDBCAggregateListener listener, Val arg, ClassMapping candidate)
Constructor.

Method Summary

void	acceptVisit(ExpressionVisitor visitor)
void	appendTo(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql, int index) Append the indexth SQL element to the given buffer.
void	calculateValue(Select sel, ExpContext ctx, ExpState state, Val other, ExpState otherState) Calculate and cache the SQL for this value.
ClassMetaData	getMetaData()
Class	getType()
void	groupBy(Select sel, ExpContext ctx, ExpState state) Group by this value.
ExpState	initialize(Select sel, ExpContext ctx, int flags) Initialize the value.
boolean	isAggregate()
int	length(Select sel, ExpContext ctx, ExpState state) Return the number of SQL elements in this value.
Object	load(ExpContext ctx, ExpState state, Result res) Load the data for this value.
void	orderBy(Select sel, ExpContext ctx, ExpState state, boolean asc) Order by this value.
void	select(Select sel, ExpContext ctx, ExpState state, boolean pks) Select the data for this value.
void	selectColumns(Select sel, ExpContext ctx, ExpState state, boolean pks) Select just the columns for this value.
void	setImplicitType(Class type)
void	setMetaData(ClassMetaData meta)

Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.AbstractVal

appendIndex, appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, appendType, getAlias, getId, getName, getPath, getSelectAs, isVariable, isXPath, setAlias, toDataStoreValue

Methods inherited from class java.lang.Object

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

Constructor Detail

Aggregate

public Aggregate(JDBCAggregateListener listener,
                 Val arg,
                 ClassMapping candidate)

Constructor.

Method Detail

getMetaData

public ClassMetaData getMetaData()

setMetaData

public void setMetaData(ClassMetaData meta)

isAggregate

public boolean isAggregate()

Specified by:

isAggregate in interface Value

Overrides:

isAggregate in class AbstractVal

getType

public Class getType()

setImplicitType

public void setImplicitType(Class type)

initialize

public ExpState initialize(Select sel,
                           ExpContext ctx,
                           int flags)

Description copied from interface: Val

Initialize the value. This method should recursively initialize any sub-values.

select

public void select(Select sel,
                   ExpContext ctx,
                   ExpState state,
                   boolean pks)

Description copied from interface: Val

Select the data for this value.

selectColumns

public void selectColumns(Select sel,
                          ExpContext ctx,
                          ExpState state,
                          boolean pks)

Description copied from interface: Val

Select just the columns for this value.

groupBy

public void groupBy(Select sel,
                    ExpContext ctx,
                    ExpState state)

Description copied from interface: Val

Group by this value.

orderBy

public void orderBy(Select sel,
                    ExpContext ctx,
                    ExpState state,
                    boolean asc)

Description copied from interface: Val

Order by this value.

load

public Object load(ExpContext ctx,
                   ExpState state,
                   Result res)
            throws SQLException

Description copied from interface: Val

Load the data for this value.

Throws:

SQLException

calculateValue

public void calculateValue(Select sel,
                           ExpContext ctx,
                           ExpState state,
                           Val other,
                           ExpState otherState)

Description copied from interface: Val

Calculate and cache the SQL for this value. This method is called before length or any append methods.

other - the value being compared to, or null if not a comparison

length

public int length(Select sel,
                  ExpContext ctx,
                  ExpState state)

Description copied from interface: Val

Return the number of SQL elements in this value.

appendTo

public void appendTo(Select sel,
                     ExpContext ctx,
                     ExpState state,
                     SQLBuffer sql,
                     int index)

Description copied from interface: Val

Append the indexth SQL element to the given buffer.

acceptVisit

public void acceptVisit(ExpressionVisitor visitor)

Specified by:

acceptVisit in interface Value

Overrides:

acceptVisit in class AbstractVal