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, Concat, Const, Extension, GetMapValue, GetObjectId, IndexOf, Math, PCPath, StringFunction, SubQ, Substring, Trim, UnaryOp, Variable

abstract class AbstractVal
extends Object
implements Val

Abstract value for easy extension.

Author:

Marc Prud'hommeaux

Field Summary

protected static String	FALSE
protected static String	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

AbstractVal()

Method Summary

void	acceptVisit(ExpressionVisitor visitor) Accept a visit from a tree visitor.
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.
int	getId()
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.
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

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