src/java.desktop/share/classes/java/awt/GraphicsConfigTemplate.java - master - githubmirror/riscv-port

src/java.desktop/share/classes/java/awt/GraphicsConfigTemplate.java
114 строк4 KB
Sergey Bylokhov
8259522: Apply java.io.Serial annotations in java.desktop
15 янв 2021, 03:28
15 янв 2021, 03:28978bed6
/*
 * Copyright (c) 1997, 2021, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.awt;

import java.io.Serial;
import java.io.Serializable;

/**
 * The {@code GraphicsConfigTemplate} class is used to obtain a valid
 * {@link GraphicsConfiguration}.  A user instantiates one of these
 * objects and then sets all non-default attributes as desired.  The
 * {@link GraphicsDevice#getBestConfiguration} method found in the
 * {@link GraphicsDevice} class is then called with this
 * {@code GraphicsConfigTemplate}.  A valid
 * {@code GraphicsConfiguration} is returned that meets or exceeds
 * what was requested in the {@code GraphicsConfigTemplate}.
 * @see GraphicsDevice
 * @see GraphicsConfiguration
 *
 * @since       1.2
 */
public abstract class GraphicsConfigTemplate implements Serializable {

    /**
     * Use serialVersionUID from JDK 1.6 for interoperability.
     */
    @Serial
    private static final long serialVersionUID = -8061369279557787079L;

    /**
     * This class is an abstract class so only subclasses can be
     * instantiated.
     */
    public GraphicsConfigTemplate() {
    }

    /**
     * Value used for "Enum" (Integer) type.  States that this
     * feature is required for the {@code GraphicsConfiguration}
     * object.  If this feature is not available, do not select the
     * {@code GraphicsConfiguration} object.
     */
    public static final int REQUIRED    = 1;

    /**
     * Value used for "Enum" (Integer) type.  States that this
     * feature is desired for the {@code GraphicsConfiguration}
     * object.  A selection with this feature is preferred over a
     * selection that does not include this feature, although both
     * selections can be considered valid matches.
     */
    public static final int PREFERRED   = 2;

    /**
     * Value used for "Enum" (Integer) type.  States that this
     * feature is not necessary for the selection of the
     * {@code GraphicsConfiguration} object.  A selection
     * without this feature is preferred over a selection that
     * includes this feature since it is not used.
     */
    public static final int UNNECESSARY = 3;

    /**
     * Returns the "best" configuration possible that passes the
     * criteria defined in the {@code GraphicsConfigTemplate}.
     * @param gc the array of {@code GraphicsConfiguration}
     * objects to choose from.
     * @return a {@code GraphicsConfiguration} object that is
     * the best configuration possible.
     * @see GraphicsConfiguration
     */
    public abstract GraphicsConfiguration
      getBestConfiguration(GraphicsConfiguration[] gc);

    /**
     * Returns a {@code boolean} indicating whether or
     * not the specified {@code GraphicsConfiguration} can be
     * used to create a drawing surface that supports the indicated
     * features.
     * @param gc the {@code GraphicsConfiguration} object to test
     * @return {@code true} if this
     * {@code GraphicsConfiguration} object can be used to create
     * surfaces that support the indicated features;
     * {@code false} if the {@code GraphicsConfiguration} can
     * not be used to create a drawing surface usable by this Java(tm)
     * API.
     */
    public abstract boolean
      isGraphicsConfigSupported(GraphicsConfiguration gc);

}