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This project was born out of a need to validate all POJOs (Plain Old Java Object) are behaving correctly. This project has two main aspects to it: * Make Testing as easy as possible. * Simplifying identity management (hashCode / equals) using annotation.

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/**
 * Copyright (C) 2010 Osman Shoukry
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */
package com.openpojo.validation.rule.impl;

import com.openpojo.business.annotation.BusinessKey;
import com.openpojo.business.utils.BusinessPojoHelper;
import com.openpojo.reflection.PojoClass;
import com.openpojo.reflection.PojoField;
import com.openpojo.validation.affirm.Affirm;
import com.openpojo.validation.rule.Rule;

/**
 * This rule ensures that PojoClass declares at least one required {@link BusinessKey}.

 * Required BusinessKey means either the required = true, or composite = true.
 *
 * @author oshoukry
 */
public class BusinessKeyMustExistRule implements Rule {

    public void evaluate(final PojoClass pojoClass) {
        for (PojoField pojoField : BusinessPojoHelper.getBusinessKeyFields(pojoClass.getClazz())) {
            BusinessKey businessKey = pojoField.getAnnotation(BusinessKey.class);
            if (businessKey.required() || businessKey.composite()) {
                return;
            }
        }

        Affirm.fail(String.format("[%s] doesn't declare any 'required' BusinessKeys!!", pojoClass.getClazz()));
    }
}