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This is a plugin to Madura Objects. It provides a rules/constraint engine to assist with validation, deriving new values from user inputs (eg total of invoices entered on this customer) an manipulating metadata (eg because the amount is above X we make some field readonly). Note that the Java that is using the monitored objects is quite unaware of the rules layer implemented here. That means you can change rules without having to go back to your Java code, and it also means you don't have to wonder if everything implemented the same rules. Anything using that Java object has the rules (unless you turn them all off).

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/*******************************************************************************
 * Copyright (c)2014 Prometheus Consulting
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package nz.co.senanque.rules;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

/**
 * 
 * The field reference records what rules get fired if this field changes.
 * 
 * @author Roger Parkinson
 * @version $Revision: 1.3 $
 */
public class FieldReference implements Serializable
{

	private static final long serialVersionUID = 1L;
	private final transient String m_className;
    private final transient String m_ruleClassName;
    private final transient String m_fieldName;
    private final transient List m_listeners = new ArrayList();
    private final transient List m_outputs = new ArrayList();

    public FieldReference(final String className, final String ruleClassName, final String fieldName)
    {
        m_className = className;
        m_ruleClassName = ruleClassName;
        m_fieldName = fieldName;
    }

    public FieldReference(final String className, final String fieldName)
    {
        m_className = className;
        m_ruleClassName = className;
        m_fieldName = fieldName;
    }

    public String getClassName()
    {
        return m_className;
    }

    public String getFieldName()
    {
        return m_fieldName;
    }

    public void addListener(final Rule rule)
    {
        m_listeners.add(rule);
    }

    public List getListeners()
    {
        return m_listeners;
    }
    public List getOutputs()
    {
        return m_outputs;
    }

    public String getRuleClassName()
    {
        return m_ruleClassName;
    }

	public void addOutput(Rule rule) {
		m_outputs.add(rule);
	}

}