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OpenWFE decision : a simple decision table implementation
There is a newer version: 1.7.2
/*
 * Copyright (c) 2006, John Mettraux, OpenWFE.org
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * . Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.  
 * 
 * . Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * 
 * . Neither the name of the "OpenWFE" nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: AbstractService.java 2587 2006-05-09 09:15:59Z jmettraux $
 */

//
// SimpleDecisionService.java
//
// [email protected]
//
// generated with 
// jtmpl 1.1.01 2004/05/19 ([email protected])
//

package openwfe.org.decision.impl;

import openwfe.org.MapUtils;
import openwfe.org.ReflectionUtils;
import openwfe.org.AbstractService;
import openwfe.org.ServiceException;
import openwfe.org.ApplicationContext;
import openwfe.org.engine.workitem.InFlowWorkItem;
import openwfe.org.engine.expressions.FlowExpression;
import openwfe.org.decision.DecisionTable;
import openwfe.org.decision.DecisionService;
import openwfe.org.decision.DecisionException;
import openwfe.org.decision.DecisionTableFactory;


/**
 * A simple implementation of a decision service.
 *
 * CVS Info :
 * 
$Author$
 * 
$Id$ 
 *
 * @author [email protected]
 */
public class SimpleDecisionService

    extends AbstractService

    implements DecisionService

{

    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger
        .getLogger(SimpleDecisionService.class.getName());

    //
    // CONSTANTS & co

    /**
     * This parameter 'decisionTableFactoryClass' tells which factory the 
     * service should use to build its tables.
     */
    public final static String P_TABLE_FACTORY_CLASS
        = "decisionTableFactoryClass";

    /**
     * The default factory class is openwfe.org.decision.CsvDecisionFactory.
     */
    public final static String DEFAULT_TABLE_FACTORY_CLASS
        = CsvDecisionTableFactory.class.getName();

    //
    // FIELDS

    private DecisionTableFactory factory = null;

    //
    // CONSTRUCTORS

    public void init 
        (final String serviceName, 
         final ApplicationContext context, 
         final java.util.Map serviceParams)
    throws 
        ServiceException
    {
        super.init(serviceName, context, serviceParams);

        //
        // build tables

        final String sClass = MapUtils.getAsString
            (serviceParams, P_TABLE_FACTORY_CLASS, DEFAULT_TABLE_FACTORY_CLASS);

        log.info("init() factory class is "+sClass);

        try
        {
            this.factory = 
                (DecisionTableFactory)ReflectionUtils
                    .initObjectOfClass(sClass, serviceParams);
        }
        catch (final Throwable t)
        {
            throw new ServiceException
                ("Failed to init DecisionTableFactory", t);
        }

        log.info("init() ready.");
    }

    //
    // METHODS from DecisionService

    /**
     * Applies the rules in a decision table.
     */
    public void apply 
        (final String tableName, 
         final InFlowWorkItem wi)
    throws
        DecisionException
    {
        apply(tableName, null, wi);
    }

    /**
     * Applies the rules in a decision table.
     */
    public void apply 
        (final String tableName, 
         final FlowExpression fe, 
         final InFlowWorkItem wi)
    throws
        DecisionException
    {
        final DecisionTable table = this.factory.getTable(tableName);

        if (table == null)
        {
            throw new DecisionException
                ("no table named '"+tableName+"' is registered");
        }

        table.apply(fe, wi);
    }

    //
    // METHODS

    //
    // STATIC METHODS

}