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 * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package javax.print.event;

import javax.print.PrintService;
import javax.print.attribute.AttributeSetUtilities;
import javax.print.attribute.PrintServiceAttributeSet;

/**
 * Class {@code PrintServiceAttributeEvent} encapsulates an event a Print
 * Service instance reports to let the client know of changes in the print
 * service state.
 */
public class PrintServiceAttributeEvent extends PrintEvent {

    /**
     * Use serialVersionUID from JDK 1.4 for interoperability.
     */
    private static final long serialVersionUID = -7565987018140326600L;

    /**
     * The printing service attributes that changed.
     */
    @SuppressWarnings("serial") // Not statically typed as Serializable
    private PrintServiceAttributeSet attributes;

    /**
     * Constructs a {@code PrintServiceAttributeEvent} object.
     *
     * @param  source the print job generating this event
     * @param  attributes the attribute changes being reported
     * @throws IllegalArgumentException if {@code source} is {@code null}
     */
    public PrintServiceAttributeEvent(PrintService source,
                                      PrintServiceAttributeSet attributes) {

        super(source);
        this.attributes = AttributeSetUtilities.unmodifiableView(attributes);
    }

    /**
     * Returns the print service.
     *
     * @return {@code PrintService} object
     */
    public PrintService getPrintService() {

        return (PrintService) getSource();
    }

    /**
     * Determine the printing service attributes that changed and their new
     * values.
     *
     * @return attributes containing the new values for the service attributes
     *         that changed. The returned set may be unmodifiable.
     */
    public PrintServiceAttributeSet getAttributes() {

        return attributes;
    }
}