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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.rulesparser;

import com.sun.codemodel.JInvocation;


/**
 * Encapsulates an Operator (+,-,* etc)
 * 
 * @author Roger Parkinson
 * @version $Revision: 1.4 $
 */
public final class Operator extends ExpressionElement
{
	private FunctionDescriptor m_od;
    private JInvocation m_expr;
	/**
	 * Constructor for Operator.
	 */
	public Operator(FunctionDescriptor od)
	{
		super(od.getFullFunctionName());
		m_od = od;
	}
	/**
	 * Returns the precedent.
	 * @return int
	 */
	public int getPrecedent()
	{
		return m_od.getPrecedence();
	}

	public String toString()
	{
	    if (m_od.isNative())
	    {
	        if (m_od.getOperator() != null)
	        {
	            return SPACES+"operator "+m_od.getOperator();
	        }
	    }
		return SPACES+"operator "+getTargetClassName()+" "+getMethodName()+" "+getArgumentCount()+super.toString()+"\n";
	}
	public boolean isAssign()
	{
		return m_od.isAssign();
	}
    public int getArgumentCount()
    {
        return m_od.getParameterTypes().length;
    }
    public Class[] getArguments()
    {
        return m_od.getParameterTypes();
    }
    public String getMethodName()
    {
        return m_od.getName();
    }
    public String getTargetClassName()
    {
        return m_od.getClassName();
    }
    public void setExpr(JInvocation expr)
    {
        m_expr = expr;
    }
    public JInvocation getExpr()
    {
        return m_expr;
    }
    public boolean isNative()
    {
        return m_od.isNative();
    }
    public Class getReturnType()
    {
        return m_od.getReturnType();
    }
    public String getSymbol()
    {
        return m_od.getOperator();
    }
    public void setFunctionDescriptor(FunctionDescriptor function)
    {
        m_od = function;
        
    }
    public Class getTypeAsClass()
    {
        return getReturnType();
    }

}