package com.bumptech.glide.load.engine.cache;

import com.bumptech.glide.load.Key;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.util.LruCache;

import static android.content.ComponentCallbacks2.TRIM_MEMORY_BACKGROUND;
import static android.content.ComponentCallbacks2.TRIM_MEMORY_MODERATE;

public class LruResourceCache extends LruCache<Key, Resource> implements MemoryCache {
    private ResourceRemovedListener listener;

    public LruResourceCache(int size) {
        super(size);
    }

    @Override
    public void setResourceRemovedListener(ResourceRemovedListener listener) {
        this.listener = listener;
    }

    @Override
    protected void onItemRemoved(Key key, Resource item) {
        if (listener != null) {
            listener.onResourceRemoved(item);
        }
    }

    @Override
    protected int getSize(Resource item) {
        return item.getSize();
    }

    public void trimMemory(int level) {
        if (level >= TRIM_MEMORY_MODERATE) {
            // Nearing middle of list of cached background apps
            // Evict our entire bitmap cache
            clearMemory();
        } else if (level >= TRIM_MEMORY_BACKGROUND) {
            // Entering list of cached background apps
            // Evict oldest half of our bitmap cache
            trimToSize(getCurrentSize() / 2);
        }

    }
}