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dbUnit is a JUnit extension (also usable from Ant and Maven) targeted for database-driven projects that, among other things, puts your database into a known state between test runs. This is an excellent way to avoid the myriad of problems that can occur when one test case corrupts the database and causes subsequent tests to fail or exacerbate the damage.

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/*
 *
 * The DbUnit Database Testing Framework
 * Copyright (C)2002-2004, DbUnit.org
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

package org.dbunit.dataset.common.handlers;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author fede
 * @author Last changed by: $Author: gommma $
 * @version $Revision: 855 $ $Date: 2008-11-01 09:23:09 -0500 (Sat, 01 Nov 2008) $
 * @since 2.2 (Sep 12, 2004)
 */
public class EnforceHandler extends AbstractPipelineComponent {

    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(EnforceHandler.class);

    private PipelineComponent [] enforcedComponents;
    private PipelineComponent theHandlerComponent;

    private EnforceHandler(PipelineComponent [] components) {
        setEnforcedComponents(components);
    }


    public static final PipelineComponent ENFORCE(PipelineComponent component) {
        logger.debug("ENFORCE(component={}) - start", component);

        return EnforceHandler.ENFORCE(new PipelineComponent [] {component});
    }

    public static final PipelineComponent ENFORCE(PipelineComponent [] components) {
        logger.debug("ENFORCE(components={}) - start", components);

        return createPipelineComponent(new EnforceHandler(components), new ENFORCE());
    }

    public boolean canHandle(char c) throws IllegalInputCharacterException {
        if(logger.isDebugEnabled())
            logger.debug("canHandle(c={}) - start", String.valueOf(c));

        for (int i = 0; i < getEnforcedComponents().length; i++) {
            if (getEnforcedComponents()[i].canHandle(c)) {
                setTheHandlerComponent(getEnforcedComponents()[i]);
                return true;
            }
        }
        throw new IllegalInputCharacterException("(working on piece #" + getPipeline().getProducts().size() + ")"
                + getPipeline().getCurrentProduct().toString() + ": " + "Character '" + c + "' cannot be handled");
    }

    public void setPipeline(Pipeline pipeline) {
        logger.debug("setPipeline(pipeline={}) - start", pipeline);

        for (int i = 0; i < getEnforcedComponents().length; i++) {
            getEnforcedComponents()[i].setPipeline(pipeline);
        }
        super.setPipeline(pipeline);
    }

    protected PipelineComponent[] getEnforcedComponents() {
        logger.debug("getEnforcedComponents() - start");

        return enforcedComponents;
    }

    protected void setEnforcedComponents(PipelineComponent[] enforcedComponents) {
        logger.debug("setEnforcedComponents(enforcedComponents={}) - start", enforcedComponents);

        this.enforcedComponents = enforcedComponents;
    }

    PipelineComponent getTheHandlerComponent() {
        logger.debug("getTheHandlerComponent() - start");

        return theHandlerComponent;
    }

    void setTheHandlerComponent(PipelineComponent theHandlerComponent) {
        logger.debug("setTheHandlerComponent(theHandlerComponent={}) - start",
                theHandlerComponent);

        this.theHandlerComponent = theHandlerComponent;
    }

    static private class ENFORCE extends Helper {

        /**
         * Logger for this class
         */
        private static final Logger logger = LoggerFactory.getLogger(ENFORCE.class);

        public void helpWith(char c) {
            if(logger.isDebugEnabled())
                logger.debug("helpWith(c={}) - start", String.valueOf(c));

            try {
                EnforceHandler handler = (EnforceHandler) getHandler();
                handler.getTheHandlerComponent().handle(c);
                getHandler().getPipeline().removeFront();
            } catch (PipelineException e) {
                throw new RuntimeException(e.getMessage());
            } catch (IllegalInputCharacterException e) {
                throw new RuntimeException(e.getMessage());
            }
            // ignore the char
        }
    }
}