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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.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 
 * The class reference stores a map of field references.
 * 
 * @author Roger Parkinson
 * @version $Revision: 1.3 $
 */
public class ClassReference implements Serializable
{

	private static final long serialVersionUID = 1L;
	private final transient Map m_fieldReferenceMap = new HashMap();
    private final transient Class m_class;
    private final transient List m_children = new ArrayList();
    
    public ClassReference(final Class clazz)
    {
        m_class = clazz;
    }

    public String getClassName()
    {
        return m_class.getSimpleName();
    }

    public FieldReference getFieldReference(final String fieldName)
    {
        FieldReference fieldReference = m_fieldReferenceMap.get(fieldName);
        if (fieldReference == null)
        {
            fieldReference = new FieldReference(getClassName(), fieldName);
            m_fieldReferenceMap.put(fieldName,fieldReference);
        }
        return fieldReference;
    }

    public String getSuperClass()
    {
        return m_class.getSuperclass().getSimpleName();
    }

    public void figureChildren(Map classReferenceMap)
    {
        for (ClassReference cr: classReferenceMap.values())
        {
            String superClass = cr.getSuperClass();
            if (superClass.equals(getClassName()))
            {
                m_children.add(cr);
            }
        }
    }

    public List getChildren()
    {
        List ret = new ArrayList();
        ret.add(this);
        for (ClassReference cr: m_children)
        {
            ret.addAll(cr.getChildren());
        }
        return ret;
    }

    public Class getClazz()
    {
        return m_class;
        
    }

}