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

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.Distinct
All Implemented Interfaces:
Serializable, Val, Value

 class Distinct
extends UnaryOp

Distinct the specified path.

Author:
Marc Prud'hommeaux

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, CONCAT_VAL, FORCE_OUTER, INDEXOF_VAL, JOIN_REL, LENGTH_VAL, LOCATE_VAL, LOWER_VAL, MATH_VAL, NULL_CMP, SQRT_VAL, SUBSTRING_VAL, TRIM_VAL, UPPER_VAL, VAL
 
Constructor Summary
Distinct(Val val)
           
 
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.
 ExpState initialize(Select sel, ExpContext ctx, int flags)
          Initialize the value.
 
Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.UnaryOp
acceptVisit, calculateValue, getMetaData, getNoParen, getType, getType, getValue, groupBy, initializeValue, length, load, orderBy, select, selectColumns, setImplicitType, setMetaData
 
Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.AbstractVal
appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, getId, isAggregate, isVariable, isXPath, toDataStoreValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Distinct

public Distinct(Val val)
Method Detail

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.

Specified by:
initialize in interface Val
Overrides:
initialize in class UnaryOp

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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