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, 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

ConstPath(Const constant)
Constructor.

Method Summary

void	acceptVisit(ExpressionVisitor 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)
void	get(FieldMetaData fmd, XMLMetaData meta)
void	get(XMLMetaData meta, String name)
String	getCorrelationVar()
void	getKey()
String	getSchemaAlias()
Object	getSQLValue(Select sel, ExpContext ctx, ExpState state) Return the SQL value of this constant.
Class	getType()
Object	getValue(ExpContext ctx, ExpState state) Return the value of this constant.
Object	getValue(Object[] params)
XMLMetaData	getXmlMapping()
ExpState	initialize(Select sel, ExpContext ctx, int flags) Initialize the value.
FieldMetaData	last()
void	setImplicitType(Class type)
void	setSchemaAlias(String schemaAlias)
void	setSubqueryContext(Context conext, String correlationVar)

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

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.jdbc.kernel.exps.Val

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

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

getAlias, getMetaData, getName, getPath, isAggregate, isVariable, isXPath, setAlias, setMetaData

Constructor Detail

ConstPath

public ConstPath(Const constant)

Constructor. Supply constant to traverse.

Method Detail

getType

public Class getType()

Specified by:

getType in interface Value

setImplicitType

public void setImplicitType(Class type)

Specified by:

setImplicitType in interface Value

get

public void get(FieldMetaData field,
                boolean nullTraversal)

Specified by:

get in interface Path

getKey

public void getKey()

Specified by:

getKey in interface JDBCPath

last

public FieldMetaData last()

Specified by:

last in interface Path

getValue

public Object getValue(Object[] params)

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)

Specified by:

acceptVisit in interface Value

Overrides:

acceptVisit in class AbstractVal

get

public void get(FieldMetaData fmd,
                XMLMetaData meta)

Specified by:

get in interface Path

get

public void get(XMLMetaData meta,
                String name)

Specified by:

get in interface Path

getXmlMapping

public XMLMetaData getXmlMapping()

Specified by:

getXmlMapping in interface Path

setSchemaAlias

public void setSchemaAlias(String schemaAlias)

Specified by:

setSchemaAlias in interface Path

getSchemaAlias

public String getSchemaAlias()

Specified by:

getSchemaAlias in interface Path

setSubqueryContext

public void setSubqueryContext(Context conext,
                               String correlationVar)

Specified by:

setSubqueryContext in interface Path

getCorrelationVar

public String getCorrelationVar()

Specified by:

getCorrelationVar in interface Path