/*
 * Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.testing.tests.unitofwork.changeflag.model;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import java.io.Serializable;
import java.io.StringWriter;

import java.sql.Date;

import org.eclipse.persistence.descriptors.changetracking.ChangeTracker;
import org.eclipse.persistence.descriptors.changetracking.CollectionChangeEvent;


/**
 * <p><b>Purpose</b>: Defines the period an Employee worked for the organization
 * <p><b>Description</b>: The period holds the start date and optionally the end date if the employee has left (null otherwise).
 * Maintained in an aggregate relationship of Employee
 * @see Employee
 */
public class ALCTEmploymentPeriod implements Serializable, ChangeTracker {
    // implements ChangeTracker for testing
    public Date startDate;
    public Date endDate;
    public PropertyChangeListener listener;

    @Override
    public PropertyChangeListener _persistence_getPropertyChangeListener() {
        return listener;
    }

    @Override
    public void _persistence_setPropertyChangeListener(PropertyChangeListener listener) {
        this.listener = listener;
    }

    public void propertyChange(String propertyName, Object oldValue, Object newValue) {
        if (listener != null) {
            if (oldValue != newValue) {
                listener.propertyChange(new PropertyChangeEvent(this, propertyName, oldValue, newValue));
            }
        }
    }

    public void collectionChange(String propertyName, Object oldValue, Object newValue, int changeType, boolean isChangeApplied) {
        if (listener != null) {
            listener.propertyChange(new CollectionChangeEvent(this, propertyName, oldValue, newValue, changeType, isChangeApplied));
        }
    }

    public ALCTEmploymentPeriod() {
    }

    /**
     * Return a new employment period instance.
     * The constructor's purpose is to allow only valid instances of a class to be created.
     * Valid means that the get/set and clone/toString methods should work on the instance.
     * Arguments to constructors should be avoided unless those arguments are required to put
     * the instance into a valid state, or represent the entire instance definition.
     */
    public ALCTEmploymentPeriod(Date startDate, Date endDate) {
        this.startDate = startDate;
        this.endDate = endDate;

    }

    public Date getEndDate() {
        return endDate;
    }

    public Date getStartDate() {
        return startDate;
    }

    public void setEndDate(Date endDate) {
        propertyChange("endDate", this.endDate, endDate);
        this.endDate = endDate;
    }

    public void setStartDate(Date startDate) {
        propertyChange("startDate", this.startDate, startDate);
        this.startDate = startDate;
    }

    /**
     * Print the start & end date
     */
    public String toString() {
        StringWriter writer = new StringWriter();

        writer.write("EmploymentPeriod: ");
        if (getStartDate() != null) {
            writer.write(getStartDate().toString());
        }
        writer.write("-");
        if (getEndDate() != null) {
            writer.write(getEndDate().toString());
        }
        return writer.toString();
    }
}