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 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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package org.apache.cayenne.dba.sqlserver;

import java.sql.DatabaseMetaData;
import java.sql.SQLException;

import org.apache.cayenne.configuration.server.DbAdapterDetector;
import org.apache.cayenne.dba.DbAdapter;
import org.apache.cayenne.di.AdhocObjectFactory;
import org.apache.cayenne.di.Inject;

/**
 * Detects SQLServer database from JDBC metadata.
 * 
 * @since 1.2
 */
public class SQLServerSniffer implements DbAdapterDetector {

    protected AdhocObjectFactory objectFactory;

    public SQLServerSniffer(@Inject AdhocObjectFactory objectFactory) {
        this.objectFactory = objectFactory;
    }

    @Override
    public DbAdapter createAdapter(DatabaseMetaData md) throws SQLException {
        String dbName = md.getDatabaseProductName();
        if (dbName == null || !dbName.toUpperCase().contains("MICROSOFT SQL SERVER")) {
            return null;
        }

        SQLServerAdapter adapter = objectFactory.newInstance(
                SQLServerAdapter.class,
                SQLServerAdapter.class.getName());

        // detect whether generated keys are supported

        boolean generatedKeys = false;
        try {
            generatedKeys = md.supportsGetGeneratedKeys();
        }
        catch (Throwable th) {
            // catch exceptions resulting from incomplete JDBC3 implementation
            // ** we have to catch Throwable, as unimplemented methods would result in
            // "AbstractMethodError".
        }

        adapter.setSupportsGeneratedKeys(generatedKeys);
        return adapter;
    }
}