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package liquibase.database; |
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import java.util.ArrayList; |
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import java.util.Comparator; |
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import java.util.List; |
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import java.util.SortedSet; |
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import java.util.TreeSet; |
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import liquibase.database.core.UnsupportedDatabase; |
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import liquibase.exception.DatabaseException; |
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import liquibase.exception.UnexpectedLiquibaseException; |
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import liquibase.logging.LogFactory; |
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import liquibase.servicelocator.ServiceLocator; |
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public class DatabaseFactory { |
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private static DatabaseFactory instance; |
| 17 | 1 | private List<Database> implementedDatabases = new ArrayList<Database>(); |
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|
| 19 | 1 | protected DatabaseFactory() { |
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try { |
| 21 | 1 | Class[] classes = ServiceLocator.getInstance().findClasses(Database.class); |
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|
| 24 | 18 | for (Class<? extends Database> clazz : classes) { |
| 25 | 17 | register(clazz.getConstructor().newInstance()); |
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} |
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| 28 | 0 | } catch (Exception e) { |
| 29 | 0 | throw new RuntimeException(e); |
| 30 | 1 | } |
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| 32 | 1 | } |
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public static DatabaseFactory getInstance() { |
| 35 | 3 | if (instance == null) { |
| 36 | 1 | instance = new DatabaseFactory(); |
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} |
| 38 | 3 | return instance; |
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} |
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public static void reset() { |
| 42 | 0 | instance = new DatabaseFactory(); |
| 43 | 0 | } |
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public List<Database> getImplementedDatabases() { |
| 49 | 2 | return implementedDatabases; |
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} |
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public void register(Database database) { |
| 53 | 17 | implementedDatabases.add(0, database); |
| 54 | 17 | } |
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public Database findCorrectDatabaseImplementation(DatabaseConnection connection) throws DatabaseException { |
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| 58 | 0 | SortedSet<Database> foundDatabases = new TreeSet<Database>(new Comparator<Database>() { |
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@Override |
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public int compare(Database o1, Database o2) { |
| 61 | 0 | return -1 * new Integer(o1.getPriority()).compareTo(o2.getPriority()); |
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} |
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}); |
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| 65 | 0 | for (Database implementedDatabase : getImplementedDatabases()) { |
| 66 | 0 | if (implementedDatabase.isCorrectDatabaseImplementation(connection)) { |
| 67 | 0 | foundDatabases.add(implementedDatabase); |
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} |
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} |
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|
| 71 | 0 | if (foundDatabases.size() == 0) { |
| 72 | 0 | LogFactory.getLogger().warning("Unknown database: " + connection.getDatabaseProductName()); |
| 73 | 0 | return new UnsupportedDatabase(); |
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} |
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Database returnDatabase; |
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try { |
| 78 | 0 | returnDatabase = foundDatabases.iterator().next().getClass().newInstance(); |
| 79 | 0 | } catch (Exception e) { |
| 80 | 0 | throw new UnexpectedLiquibaseException(e); |
| 81 | 0 | } |
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| 83 | 0 | returnDatabase.setConnection(connection); |
| 84 | 0 | return returnDatabase; |
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} |
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public String findDefaultDriver(String url) { |
| 88 | 0 | for (Database database : this.getImplementedDatabases()) { |
| 89 | 0 | String defaultDriver = database.getDefaultDriver(url); |
| 90 | 0 | if (defaultDriver != null) { |
| 91 | 0 | return defaultDriver; |
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} |
| 93 | 0 | } |
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|
| 95 | 0 | return null; |
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} |
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public void clearRegistry() { |
| 102 | 0 | implementedDatabases.clear(); |
| 103 | 0 | } |
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} |