org.appcelerator.titanium.util.TiBlobLruCache.java Source code

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Here is the source code for org.appcelerator.titanium.util.TiBlobLruCache.java

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/**
 * Appcelerator Titanium Mobile
 * Copyright (c) 2013 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Apache Public License
 * Please see the LICENSE included with this distribution for details.
 */
package org.appcelerator.titanium.util;

import org.appcelerator.titanium.TiC;

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

public class TiBlobLruCache extends LruCache<String, Bitmap> {
    // Get max available VM memory, exceeding this amount will throw an
    // OutOfMemory exception. Stored in kilobytes as LruCache takes an
    // int in its constructor.
    private static final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

    // Use 1/8th of the available memory for this memory cache.
    private static final int cacheSize = maxMemory / 8;

    protected static TiBlobLruCache _instance;

    public static TiBlobLruCache getInstance() {
        if (_instance == null) {
            _instance = new TiBlobLruCache();
        }
        return _instance;
    }

    public TiBlobLruCache() {
        super(cacheSize);
    }

    @Override
    protected int sizeOf(String key, Bitmap bitmap) {
        // The cache size will be measured in kilobytes rather than
        // number of items.
        if (android.os.Build.VERSION.SDK_INT > TiC.API_LEVEL_HONEYCOMB) {
            return bitmap.getByteCount() / 1024;
        } else {
            return bitmap.getRowBytes() * bitmap.getHeight() / 1024;
        }
    }

    public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
        if (getBitmapFromMemCache(key) == null) {
            _instance.put(key, bitmap);
        }
    }

    public Bitmap getBitmapFromMemCache(String key) {
        return _instance.get(key);
    }
}