net.sourceforge.fluxion.datapublisher.sql.impl
Class SQLQueryFactory

java.lang.Object
  net.sourceforge.fluxion.datapublisher.sql.impl.SQLQueryFactory

All Implemented Interfaces:

QueryGenerator

Direct Known Subclasses:

MySQLQueryFactory, ODBCQueryFactory, PostgresqlQueryFactory

public abstract class SQLQueryFactory
extends java.lang.Object
implements QueryGenerator

Generates a Query that can be executed against a MySQL database.

Version:

0.2

Author:

Tony Burdett

See Also:

SQLQuery

Constructor Summary

SQLQueryFactory(java.lang.String dbUrl, java.lang.String user, java.lang.String password)

Method Summary

<F> Query<F>	generateQuery(Filter<F> filter) Create a query that can then be used to obtain data from a database.
protected abstract <F> SQLQuery<F>	makeQueryInstance(java.lang.Class<F> beanClass, Filter filter, java.lang.String dbUrl, java.lang.String user, java.lang.String password) Instantiate a new query instance from the parameters given.

Methods inherited from class java.lang.Object

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

Constructor Detail

SQLQueryFactory

public SQLQueryFactory(java.lang.String dbUrl,
                       java.lang.String user,
                       java.lang.String password)

Method Detail

generateQuery

public <F> Query<F> generateQuery(Filter<F> filter)
                       throws QueryGenerationException

Description copied from interface: QueryGenerator

Create a query that can then be used to obtain data from a database. The returned query will be typed by the bean which the Filter is typed by - so if generateQuery(Filter?Foo>) is called, a Query?Foo> will be returned.

Specified by:

generateQuery in interface QueryGenerator

Parameters:

filter - the filter to use to make the query

Returns:

the query, typed by the bean being queried

Throws:

QueryGenerationException - if there was a probelm generating the query

makeQueryInstance

protected abstract <F> SQLQuery<F> makeQueryInstance(java.lang.Class<F> beanClass,
                                                     Filter filter,
                                                     java.lang.String dbUrl,
                                                     java.lang.String user,
                                                     java.lang.String password)

Instantiate a new query instance from the parameters given. This effectively defers the decision about the type of the Query to be instantiated to the concrete implementations of this class. Usually, implementations of this class will be extremely simple - a single line to instantiate a new concrete implementation of the appropriate class.

Parameters:

beanClass - the beanClass a Query is needed for

filter - the filter used to make this query

dbUrl - the URL of the database

user - the username to use to connect to the database

password - the password to connect to the database with @return a new SQLQuery instance of appropriate type

Returns:

the SQLQuery that can be executed