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

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.AbstractVal
      org.apache.openjpa.jdbc.kernel.exps.UnaryOp
          org.apache.openjpa.jdbc.kernel.exps.DatastoreFunction

All Implemented Interfaces:

Serializable, Val, Value

public class DatastoreFunction
extends UnaryOp

A unary operator that executes a datastore specific function with zero or more arguments.

Author:

Pinaki Poddar

See Also:

Serialized Form

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

DatastoreFunction(String name, Class<?> resultType, Arguments args)

Method Summary

void	appendTo(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql, int index) Append the indexth SQL element to the given buffer.
protected String	getOperator() Return the name of this operator.

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

acceptVisit, calculateValue, getMetaData, getNoParen, getType, getType, getValue, groupBy, initialize, initializeValue, length, load, orderBy, select, selectColumns, setImplicitType, setMetaData

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DatastoreFunction

public DatastoreFunction(String name,
                         Class<?> resultType,
                         Arguments args)

Method Detail

getOperator

protected String getOperator()

Description copied from class: UnaryOp

Return the name of this operator.

Specified by:

getOperator in class UnaryOp

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.

Specified by:

appendTo in interface Val

Overrides:

appendTo in class UnaryOp