org.apache.openjpa.jdbc.kernel.exps

Class AbstractVal

java.lang.Object

org.apache.openjpa.jdbc.kernel.exps.AbstractVal

All Implemented Interfaces:

Serializable, Val, Value

Direct Known Subclasses:

Aggregate, Args, CoalesceExpression, Concat, Const, Extension, GeneralCaseExpression, GetMapValue, GetObjectId, IndexOf, MapEntry, MapKey, Math, NullIfExpression, SimpleCaseExpression, StringFunction, SubQ, Substring, Trim, UnaryOp, Variable

abstract class AbstractVal
extends Object
implements Val

Abstract value for easy extension.

Author:

Marc Prud'hommeaux

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	FALSE
protected static String	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

Constructors

Constructor and Description
AbstractVal()

Method Summary

Methods

Modifier and Type	Method and Description
void	acceptVisit(ExpressionVisitor visitor) Accept a visit from a tree visitor.
void	appendIndex(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL checking the index of this value.
void	appendIsEmpty(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL testing whether this value is empty to the given buffer.
void	appendIsNotEmpty(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL testing whether this value is not empty to the given buffer.
void	appendIsNotNull(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL testing whether this value is not null to the given buffer.
void	appendIsNull(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL testing whether this value is null to the given buffer.
void	appendSize(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL checking the size of this value.
void	appendType(Select sel, ExpContext ctx, ExpState state, SQLBuffer sql) Append the SQL checking the type of this value.
String	getAlias() Return select item alias
int	getId()
String	getName()
Path	getPath()
Value	getSelectAs() Return 'this' concrete class if alias is set, otherwise null
boolean	isAggregate() Return true if this value is an aggregate.
boolean	isVariable() Return true if this value is a variable.
boolean	isXPath() Return true if this value is an XML Path.
void	setAlias(String alias) Set select item alias
Object	toDataStoreValue(Select sel, ExpContext ctx, ExpState state, Object val) Return the datastore value of the given object in the context of this value.

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

appendTo, calculateValue, groupBy, initialize, length, load, orderBy, select, selectColumns

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

getMetaData, getType, setImplicitType, setMetaData

Field Detail

TRUE

protected static final String TRUE

See Also:

Constant Field Values

FALSE

protected static final String FALSE

See Also:

Constant Field Values

Constructor Detail

AbstractVal

AbstractVal()

Method Detail

isVariable

public boolean isVariable()

Description copied from interface: Value

Return true if this value is a variable.

Specified by:

isVariable in interface Value

isAggregate

public boolean isAggregate()

Description copied from interface: Value

Return true if this value is an aggregate.

Specified by:

isAggregate in interface Value

isXPath

public boolean isXPath()

Description copied from interface: Value

Return true if this value is an XML Path.

Specified by:

isXPath in interface Value

toDataStoreValue

public Object toDataStoreValue(Select sel,
                      ExpContext ctx,
                      ExpState state,
                      Object val)

Description copied from interface: Val

Return the datastore value of the given object in the context of this value.

Specified by:

toDataStoreValue in interface Val

appendIsEmpty

public void appendIsEmpty(Select sel,
                 ExpContext ctx,
                 ExpState state,
                 SQLBuffer sql)

Description copied from interface: Val

Append the SQL testing whether this value is empty to the given buffer.

Specified by:

appendIsEmpty in interface Val

appendIsNotEmpty

public void appendIsNotEmpty(Select sel,
                    ExpContext ctx,
                    ExpState state,
                    SQLBuffer sql)

Description copied from interface: Val

Append the SQL testing whether this value is not empty to the given buffer.

Specified by:

appendIsNotEmpty in interface Val

appendIsNull

public void appendIsNull(Select sel,
                ExpContext ctx,
                ExpState state,
                SQLBuffer sql)

Description copied from interface: Val

Append the SQL testing whether this value is null to the given buffer.

Specified by:

appendIsNull in interface Val

appendIsNotNull

public void appendIsNotNull(Select sel,
                   ExpContext ctx,
                   ExpState state,
                   SQLBuffer sql)

Description copied from interface: Val

Append the SQL testing whether this value is not null to the given buffer.

Specified by:

appendIsNotNull in interface Val

appendIndex

public void appendIndex(Select sel,
               ExpContext ctx,
               ExpState state,
               SQLBuffer sql)

Description copied from interface: Val

Append the SQL checking the index of this value.

Specified by:

appendIndex in interface Val

appendType

public void appendType(Select sel,
              ExpContext ctx,
              ExpState state,
              SQLBuffer sql)

Description copied from interface: Val

Append the SQL checking the type of this value.

Specified by:

appendType in interface Val

appendSize

public void appendSize(Select sel,
              ExpContext ctx,
              ExpState state,
              SQLBuffer sql)

Description copied from interface: Val

Append the SQL checking the size of this value.

Specified by:

appendSize 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

getId

public int getId()

Specified by:

getId in interface Val

getAlias

public String getAlias()

Description copied from interface: Value

Return select item alias

Specified by:

getAlias in interface Value

setAlias

public void setAlias(String alias)

Description copied from interface: Value

Set select item alias

Specified by:

setAlias in interface Value

getSelectAs

public Value getSelectAs()

Description copied from interface: Value

Return 'this' concrete class if alias is set, otherwise null

Specified by:

getSelectAs in interface Val

Specified by:

getSelectAs in interface Value

getPath

public Path getPath()

Specified by:

getPath in interface Value

getName

public String getName()

Specified by:

getName in interface Value