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

java.lang.Object
  org.apache.openjpa.jdbc.kernel.exps.SQLEmbed

All Implemented Interfaces:

Serializable, JDBCFilterListener, FilterListener

Direct Known Subclasses:

SQLExpression, SQLValue

public class SQLEmbed
extends Object
implements JDBCFilterListener

Simple listener which embeds its SQL argument into the query. Listens on sql. Example:
"price < sql(\"(SELECT AVG (PRICE) FROM PRODUCT_TABLE)\")"

See Also:

Serialized Form

Field Summary

static String

TAG

Constructor Summary

SQLEmbed()

Method Summary

void	appendTo(SQLBuffer buf, FilterValue target, FilterValue[] args, ClassMapping type, JDBCStore store) Append the SQL for this expression or value.
Object	evaluate(Object target, Class targetClass, Object[] args, Class[] argClasses, Object candidate, StoreContext ctx)
boolean	expectsArguments()
boolean	expectsTarget()
String	getTag()
Class	getType(Class targetClass, Class[] argClasses)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TAG

public static String TAG

Constructor Detail

SQLEmbed

public SQLEmbed()

Method Detail

getTag

public String getTag()

Specified by:

getTag in interface FilterListener

expectsArguments

public boolean expectsArguments()

Specified by:

expectsArguments in interface FilterListener

expectsTarget

public boolean expectsTarget()

Specified by:

expectsTarget in interface FilterListener

evaluate

public Object evaluate(Object target,
                       Class targetClass,
                       Object[] args,
                       Class[] argClasses,
                       Object candidate,
                       StoreContext ctx)

Specified by:

evaluate in interface FilterListener

appendTo

public void appendTo(SQLBuffer buf,
                     FilterValue target,
                     FilterValue[] args,
                     ClassMapping type,
                     JDBCStore store)

Description copied from interface: JDBCFilterListener

Append the SQL for this expression or value.

Specified by:

appendTo in interface JDBCFilterListener

Parameters:

buf - the SQL buffer to append to

target - the target to act on, or null if the listener doesn't expect a target

args - the values of the arguments given in the filter, or null if this listener doesn't expect arguments

type - the class mapping for the query's candidate class

store - the store that owns the query

getType

public Class getType(Class targetClass,
                     Class[] argClasses)

Specified by:

getType in interface FilterListener