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105 lines
2.2 KiB
105 lines
2.2 KiB
/*
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* Updater.java
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*
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* Created on 26 de Setembro de 2006, 11:49
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*
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* To change this template, choose Tools | Template Manager
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* and open the template in the editor.
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*/
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package siprp.update;
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import java.util.*;
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import com.evolute.utils.*;
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import com.evolute.utils.arrays.*;
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import com.evolute.utils.db.*;
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import com.evolute.utils.sql.*;
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/**
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*
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* @author fpalma
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*/
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public class UpdateList
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{
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protected static final Update UPDATE_LIST[] =
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new Update[]{ new siprp.update.updates.V6_1_To_V7_0(), new siprp.update.updates.V7_0_To_V7_1() };
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protected static Executer EXECUTER;
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protected static double version = -1;
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/** Creates a new instance of Updater */
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private UpdateList()
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{
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}
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public static double getCurrentVersion()
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throws Exception
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{
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if( version < 0 )
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{
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version = getVersion();
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}
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return version;
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}
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public static Update []getUpdates()
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throws Exception
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{
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if( version < 0 )
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{
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version = getVersion();
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}
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Vector validUpdates = new Vector();
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for( int n = 0; n < UPDATE_LIST.length; n++ )
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{
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if( version <= UPDATE_LIST[ n ].getStartVersion() )
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{
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validUpdates.add( UPDATE_LIST[ n ] );
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}
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}
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return ( Update [] ) validUpdates.toArray( new Update[ validUpdates.size() ] );
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}
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protected static double getVersion()
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throws Exception
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{
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DBManager dbm = ( DBManager ) Singleton.getInstance( Singleton.DEFAULT_DBMANAGER );
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EXECUTER = dbm.getSharedExecuter();
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try
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{
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return readVersion();
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}
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catch( Exception ex )
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{
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createVersionTable();
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}
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return readVersion();
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}
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protected static double readVersion()
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throws Exception
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{
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Select select =
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new Select( new String[]{ "version" },
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new String[]{ "MAX(current_version)" },
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null );
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Virtual2DArray array = EXECUTER.executeQuery( select );
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return ( ( Number ) array.get( 0, 0 ) ).doubleValue();
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}
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protected static void createVersionTable()
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throws Exception
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{
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com.evolute.utils.sql.Update update =
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new com.evolute.utils.sql.Update( "CREATE TABLE version( current_version float );" );
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EXECUTER.executeQuery( update );
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Insert insert =
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new Insert( "version",
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new Assignment[]{
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new Assignment( new Field( "current_version" ), new Double( 0.1 ) ) } );
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EXECUTER.executeQuery( insert );
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}
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}
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