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

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.AbstractVal
      org.apache.openjpa.jdbc.kernel.exps.Const
          org.apache.openjpa.jdbc.kernel.exps.ConstPath

All Implemented Interfaces:

Serializable, JDBCPath, Val, Constant, Path, Value

 class ConstPath
extends Const
implements JDBCPath

A field traversal starting with a constant filter parameter.

Author:

Abe White

Nested Class Summary

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, 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

ConstPath(Const constant)
Constructor.

Method Summary

void	acceptVisit(ExpressionVisitor visitor) Accept a visit from a tree 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.
void	get(FieldMetaData field, boolean nullTraversal) Traverse into the given field of the current object, and update the current object to that field value.
void	get(FieldMetaData fmd, XMLMetaData meta) Traverse into the given field that maps to xml column, and update the current object to that field value.
void	get(XMLMetaData meta, String name) Traverse into the gevin xpath name of the current object, and update the current object to that xpath field.
void	getKey()
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.
XMLMetaData	getXmlMapping() Return the current XPath's xmlmapping metadata.
ExpState	initialize(Select sel, ExpContext ctx, int flags) Initialize the value.
FieldMetaData	last() Return the last field in the path, or null if the path does not not contain a final field.
void	setImplicitType(Class type) Set the implicit type of the value, based on how it is used in the filter.

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

appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, getMetaData, groupBy, isSQLValueNull, length, load, orderBy, select, selectColumns, setMetaData

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

getId, isAggregate, isVariable, isXPath, 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

getMetaData, isAggregate, isVariable, isXPath, setMetaData

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

appendIsEmpty, appendIsNotEmpty, appendIsNotNull, appendIsNull, appendSize, getId, groupBy, length, load, orderBy, select, selectColumns, toDataStoreValue

Methods inherited from interface org.apache.openjpa.kernel.exps.Value

getMetaData, isAggregate, isVariable, isXPath, setMetaData

Constructor Detail

ConstPath

public ConstPath(Const constant)

Constructor. Supply constant to traverse.

Method Detail

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

get

public void get(FieldMetaData field,
                boolean nullTraversal)

Description copied from interface: Path

Traverse into the given field of the current object, and update the current object to that field value.

Specified by:

get in interface Path

nullTraversal - if true, allow traversal through a null field

getKey

public void getKey()

Specified by:

getKey in interface JDBCPath

last

public FieldMetaData last()

Description copied from interface: Path

Return the last field in the path, or null if the path does not not contain a final field.

Specified by:

last in interface Path

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

acceptVisit

public void acceptVisit(ExpressionVisitor visitor)

Description copied from interface: Value

Accept a visit from a tree visitor.

Specified by:

acceptVisit in interface Value

Overrides:

acceptVisit in class AbstractVal

get

public void get(FieldMetaData fmd,
                XMLMetaData meta)

Description copied from interface: Path

Traverse into the given field that maps to xml column, and update the current object to that field value.

Specified by:

get in interface Path

Parameters:

fmd - field maps to xml column

meta - associated xml mapping

get

public void get(XMLMetaData meta,
                String name)

Description copied from interface: Path

Traverse into the gevin xpath name of the current object, and update the current object to that xpath field.

Specified by:

get in interface Path

getXmlMapping

public XMLMetaData getXmlMapping()

Description copied from interface: Path

Return the current XPath's xmlmapping metadata.

Specified by:

getXmlMapping in interface Path

Returns:

Return xmlmapping