org.geometerplus.android.util.BitmapCache.java Source code

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Here is the source code for org.geometerplus.android.util.BitmapCache.java

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/*
 * Copyright (C) 2010-2014 Geometer Plus <contact@geometerplus.com>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.android.util;

import android.graphics.Bitmap;
import android.support.v4.util.LruCache;

public class BitmapCache {
    public static class Container {
        public final Bitmap Bitmap;

        private Container(Bitmap bitmap) {
            Bitmap = bitmap;
        }

        int size() {
            return Bitmap.getRowBytes() * Bitmap.getHeight();
        }
    }

    private static final Container NULL = new Container(null) {
        @Override
        int size() {
            return 1;
        }
    };

    private final LruCache<Long, Container> myLruCache;

    public BitmapCache(float factor) {
        myLruCache = new LruCache<Long, Container>((int) (factor * Runtime.getRuntime().maxMemory())) {
            @Override
            protected int sizeOf(Long key, Container container) {
                return container.size();
            }
        };
    }

    public Container get(Long key) {
        return myLruCache.get(key);
    }

    public void put(Long key, Bitmap bitmap) {
        myLruCache.put(key, bitmap != null ? new Container(bitmap) : NULL);
    }

    public void remove(Long key) {
        myLruCache.remove(key);
    }
}