com.sun.mdm.index.query
Class AssemblerEngineImpl

java.lang.Object
  com.sun.mdm.index.query.AssemblerEngineImpl

All Implemented Interfaces:

AssemblerEngine, java.lang.Cloneable

public class AssemblerEngineImpl

extends java.lang.Object

implements AssemblerEngine, java.lang.Cloneable

This AssemblerEngine is responsible to initialize the data structures that are used during Assembling. It holds reference to Array of QueryResultSet and call them in a loop until the next root composite object has been fetched and assembled. The actual assembling for each JDBC resultset is delegated to QueryResultSet.

Constructor Summary

AssemblerEngineImpl()
Creates a new instance of AssemblerEngine

Method Summary

java.lang.Object	clone() clones the AssemblerEngine
void	close() close the underlying connection.
void	finalizer() finalizer closes the database connection
boolean	hasNext() returns true if there is another composite value object else returns false.
void	initCompile(SQLDescriptor[] sqlDesc, AssembleDescriptor assDesc) part of compilation is to create CreateObjectList and create AssembleObjectState These will be used during run time execution of engine.
void	initRun(java.sql.Connection con, java.sql.ResultSet[] resultSets, java.sql.Statement[] statements, int maxRows) This initialises data structures that are used during assembling.
void	initRun(java.sql.Connection con, java.sql.ResultSet[] resultSets, java.sql.Statement[] statements, int maxRows, boolean closeDbConnection) This initialises data structures that are used during assembling.
java.lang.Object	next() get the next Root Value object.
boolean	setDbConnectionCondition() Gets the value of mCloseDbConnection.
void	setDbConnectionCondition(boolean val) Sets the value of mCloseDbConnection.

Methods inherited from class java.lang.Object

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

Constructor Detail

AssemblerEngineImpl

public AssemblerEngineImpl()

Creates a new instance of AssemblerEngine

Method Detail

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

clones the AssemblerEngine

Specified by:

clone in interface AssemblerEngine

Returns:

clone of this engine

Throws:

java.lang.CloneNotSupportedException - CloneNotSupportedException

close

public void close()
           throws QMException

close the underlying connection.

Specified by:

close in interface AssemblerEngine

Throws:

QMException - QMException

finalizer

public void finalizer()
               throws QMException

finalizer closes the database connection

Throws:

QMException - QMException

hasNext

public boolean hasNext()
                throws QMException

returns true if there is another composite value object else returns false.

Specified by:

hasNext in interface AssemblerEngine

Returns:

true or false

Throws:

QMException - QMException

initCompile

public void initCompile(SQLDescriptor[] sqlDesc,
                        AssembleDescriptor assDesc)
                 throws QMException

part of compilation is to create CreateObjectList and create AssembleObjectState These will be used during run time execution of engine.

Specified by:

initCompile in interface AssemblerEngine

Parameters:

sqlDesc - SQLDescriptor[]

assDesc - AssembleDescriptor

Throws:

QMException - QMException

initRun

public void initRun(java.sql.Connection con,
                    java.sql.ResultSet[] resultSets,
                    java.sql.Statement[] statements,
                    int maxRows)
             throws QMException

This initialises data structures that are used during assembling.

Specified by:

initRun in interface AssemblerEngine

Parameters:

con - JDBC DataSource Connection

resultSets - ResultSet[] that contain multiple ResultSets executed by QueryManager

maxRows - Maximum Rows

statements - Statement[]

Throws:

QMException - QMException

initRun

public void initRun(java.sql.Connection con,
                    java.sql.ResultSet[] resultSets,
                    java.sql.Statement[] statements,
                    int maxRows,
                    boolean closeDbConnection)
             throws QMException

This initialises data structures that are used during assembling.

Specified by:

initRun in interface AssemblerEngine

Parameters:

con - JDBC DataSource Connection

resultSets - ResultSet[] that contain multiple ResultSets executed by QueryManager

maxRows - maximum number of rows

closeDbConnection - set to true if the database connection is to be closed by the AssemblerEngineImpl, false if some other calling class is to close the database connection instead

statements - Statement[]

Throws:

QMException - QMException

next

public java.lang.Object next()
                      throws QMException

get the next Root Value object.

Specified by:

next in interface AssemblerEngine

Returns:

return next Root of Composite Value Object

Throws:

QMException - QMException

setDbConnectionCondition

public boolean setDbConnectionCondition()

Gets the value of mCloseDbConnection.

Returns:

value of mCloseDbConnection.

setDbConnectionCondition

public void setDbConnectionCondition(boolean val)

Sets the value of mCloseDbConnection.

Parameters:

val - value to which mCloseDbConnection is to be set.