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

java.lang.Object
  extended by org.apache.openjpa.jdbc.kernel.exps.AbstractVal
      extended by org.apache.openjpa.jdbc.kernel.exps.Const
          extended by org.apache.openjpa.jdbc.kernel.exps.Param
All Implemented Interfaces:
Serializable, Val, Constant, Parameter, Value

public class Param
extends Const
implements Parameter

A parameter in a filter.

Author:
Abe White
See Also:
Serialized Form

Nested Class Summary
static class Param.ParamExpState
          Expression state.
 
Nested classes/interfaces inherited from class org.apache.openjpa.jdbc.kernel.exps.Const
Const.ConstExpState
 
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
Param(Object key, Class type)
          Constructor.
 
Method Summary
 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.
 int getIndex()
           
 Object getParameterKey()
          Returns the key of the parameter.
 Object getSQLValue(Select sel, ExpContext ctx, ExpState state)
          Return the SQL value of this constant.
 Class getType()
          Return the expected type for this value, or Object if the type is unknown.
 Object getValue(ExpContext ctx, ExpState state)
          Return the value of this constant.
 Object getValue(Object[] params)
          Return the value for this constant given the specified parameters.
 ClassMapping getValueMetaData(ExpContext ctx)
           
 ExpState initialize(Select sel, ExpContext ctx, int flags)
          Initialize the value.
 int length(Select sel, ExpContext ctx, ExpState state)
          Return the number of SQL elements in this value.
 void setImplicitType(Class type)
          Set the implicit type of the value, based on how it is used in the filter.
 void setIndex(int idx)
          Set the index of this parameter.
 
Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.Const
appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, getMetaData, groupBy, isSQLValueNull, load, orderBy, select, selectColumns, setMetaData
 
Methods inherited from class org.apache.openjpa.jdbc.kernel.exps.AbstractVal
acceptVisit, appendIndex, 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
 
Methods inherited from interface org.apache.openjpa.kernel.exps.Value
acceptVisit, getAlias, getMetaData, getName, getPath, getSelectAs, isAggregate, isVariable, isXPath, setAlias, setMetaData
 

Constructor Detail

Param

public Param(Object key,
             Class type)
Constructor. Supply parameter name and type.

Method Detail

getParameterKey

public Object getParameterKey()
Description copied from interface: Parameter
Returns the key of the parameter.

Specified by:
getParameterKey in interface Parameter

getType

public Class getType()
Description copied from interface: Value
Return the expected type for this value, or Object if the type is unknown.

Specified by:
getType in interface Value

setImplicitType

public void setImplicitType(Class type)
Description copied from interface: Value
Set the implicit type of the value, based on how it is used in the filter. This method is only called on values who return Object from Value.getType().

Specified by:
setImplicitType in interface Value

getIndex

public int getIndex()

setIndex

public void setIndex(int idx)
Description copied from interface: Parameter
Set the index of this parameter.

Specified by:
setIndex in interface Parameter

getValueMetaData

public ClassMapping getValueMetaData(ExpContext ctx)

getValue

public Object getValue(Object[] params)
Description copied from interface: Constant
Return the value for this constant given the specified parameters.

Specified by:
getValue in interface Constant

getValue

public Object getValue(ExpContext ctx,
                       ExpState state)
Description copied from class: Const
Return the value of this constant. May be more robust than the parameters-only form.

Overrides:
getValue in class Const

getSQLValue

public Object getSQLValue(Select sel,
                          ExpContext ctx,
                          ExpState state)
Description copied from class: Const
Return the SQL value of this constant.

Overrides:
getSQLValue in class Const

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 Const

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.

Specified by:
calculateValue in interface Val
Overrides:
calculateValue in class Const
other - the value being compared to, or null if not a comparison

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

length

public int length(Select sel,
                  ExpContext ctx,
                  ExpState state)
Description copied from interface: Val
Return the number of SQL elements in this value.

Specified by:
length in interface Val
Overrides:
length in class Const


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