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

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


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