/*

 * Copyright (c) 2003, 2006, 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

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 */

package sun.font;

import java.lang.ref.Reference;

import java.util.concurrent.ConcurrentHashMap;

import sun.java2d.Disposer;

import sun.java2d.DisposerRecord;

/*

 * This keeps track of data that needs to be cleaned up once a

 * strike is freed.

 * a) The native memory that is the glyph image cache.

 * b) removing the "desc" key from the strike's map.

 * This is safe to do because this disposer is invoked only when the

 * reference object has been cleared, which means the value indexed by

 * this key is just an empty reference object.

 * It is possible that a new FontStrike has been created that would

 * be referenced by the same (equals) key. If it is placed in the map

 * before this disposer is executed, then we do not want to remove that

 * object. We should only remove an object where the value is null.

 * So we first verify that the key still points to a cleared reference.

 * Updates to the map thus need to be synchronized.

 *

 * A WeakHashmap will automatically clean up, but we might maintain a

 * reference to the "desc" key in the FontStrike (value) which would

 * prevent the keys from being discarded. And since the strike is the only

 * place is likely we would maintain such a strong reference, then the map

 * entries would be removed much more promptly than we need.

 */

class FontStrikeDisposer

    implements DisposerRecord, Disposer.PollDisposable {

    ConcurrentHashMap<FontStrikeDesc, Reference> strikeCache;

    FontStrikeDesc desc;

    long[] longGlyphImages;

    int [] intGlyphImages;

    int [][] segIntGlyphImages;

    long[][] segLongGlyphImages;

    long pScalerContext = 0L;

    boolean disposed = false;

    boolean comp = false;

    public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,

                              long pContext, int[] images) {

        this.strikeCache = font2D.strikeCache;

        this.desc = desc;

        this.pScalerContext = pContext;

        this.intGlyphImages = images;

    }

    public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,

                              long pContext, long[] images) {

        this.strikeCache = font2D.strikeCache;

        this.desc = desc;

        this.pScalerContext = pContext;

        this.longGlyphImages = images;

    }

    public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc,

                              long pContext) {

        this.strikeCache = font2D.strikeCache;

        this.desc = desc;

        this.pScalerContext = pContext;

    }

    public FontStrikeDisposer(Font2D font2D, FontStrikeDesc desc) {

        this.strikeCache = font2D.strikeCache;

        this.desc = desc;

        this.comp = true;

    }

    public synchronized void dispose() {

        if (!disposed) {

            Reference<FontStrike> ref = strikeCache.get(desc);

            if (ref != null) {

                Object o = ref.get();

                if (o == null) {

                    strikeCache.remove(desc);

                }

            }

            StrikeCache.disposeStrike(this);

            disposed = true;

        }

    }

}