org.pentaho.pms.mql.MQLQueryFactory.java Source code

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Here is the source code for org.pentaho.pms.mql.MQLQueryFactory.java

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/*
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * Copyright (c) 2006 - 2009 Pentaho Corporation..  All rights reserved.
 */
package org.pentaho.pms.mql;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pentaho.di.core.database.DatabaseMeta;
import org.pentaho.pms.core.exception.PentahoMetadataException;
import org.pentaho.pms.factory.CwmSchemaFactoryInterface;
import org.pentaho.pms.messages.Messages;

/**
 * @deprecated as of metadata 3.0.
 */
public class MQLQueryFactory {

    private static final Log logger = LogFactory.getLog(MQLQueryFactory.class);

    public static MQLQuery getMQLQuery(String XML, DatabaseMeta meta, String locale,
            CwmSchemaFactoryInterface factory) throws PentahoMetadataException {
        // load MQLQuery class instance from properties somewhere
        String mqlQueryClassName = System.getProperty("org.pentaho.pms.mql.MQLQueryClassName", //$NON-NLS-1$
                "org.pentaho.pms.mql.MQLQueryImpl"); //$NON-NLS-1$
        return getMQLQuery(mqlQueryClassName, XML, meta, locale, factory);

    }

    public static MQLQuery getMQLQuery(String mqlQueryClassName, String XML, DatabaseMeta meta, String locale,
            CwmSchemaFactoryInterface factory) throws PentahoMetadataException {
        // load MQLQuery class instance from properties somewhere
        try {
            Class<?> claz = Class.forName(mqlQueryClassName);

            Class<? extends MQLQuery> clazz = (Class<? extends MQLQuery>) claz.asSubclass(MQLQuery.class);

            if (MQLQuery.class.isAssignableFrom(clazz)) {
                Class[] argClasses = { String.class, DatabaseMeta.class, String.class,
                        CwmSchemaFactoryInterface.class };
                Constructor<? extends MQLQuery> constr = clazz.getConstructor(argClasses);
                Object[] vars = { XML, meta, locale, factory };
                return constr.newInstance(vars);
            } else {
                logger.error(Messages.getErrorString("MQLQueryFactory.ERROR_0001_MQLQUERY_CLASS_NOT_ASSIGNABLE", //$NON-NLS-1$
                        mqlQueryClassName));
            }
        } catch (ClassNotFoundException e) {
            logger.error(Messages.getErrorString("MQLQueryFactory.ERROR_0002_MQLQUERY_CLASS_NOT_FOUND", //$NON-NLS-1$
                    mqlQueryClassName), e);
        } catch (NoSuchMethodException e) {
            logger.error(Messages.getErrorString(
                    "MQLQueryFactory.ERROR_0003_MQLQUERY_CLASS_DOES_NOT_CONTAIN_CONSTRUCTOR", mqlQueryClassName), //$NON-NLS-1$
                    e);
        } catch (IllegalAccessException e) {
            logger.error(Messages.getErrorString("MQLQueryFactory.ERROR_0004_MQLQUERY_CLASS_ILLEGAL_ACCESS", //$NON-NLS-1$
                    mqlQueryClassName), e);
        } catch (InstantiationException e) {
            logger.error(Messages.getErrorString("MQLQueryFactory.ERROR_0005_MQLQUERY_CLASS_CANNOT_INSTANTIATE", //$NON-NLS-1$
                    mqlQueryClassName), e);
        } catch (InvocationTargetException e) {
            if (e.getTargetException() instanceof PentahoMetadataException) {
                throw (PentahoMetadataException) e.getTargetException();
            } else {
                logger.error(Messages.getErrorString("MQLQueryFactory.ERROR_0006_MQLQUERY_CLASS_CANNOT_INVOKE", //$NON-NLS-1$
                        mqlQueryClassName), e);
            }
        }
        return null;
    }

}