ImageMemCacheOperation.java

package external.GifImageViewEx.net.frakbot.imageviewex.operation;

import external.GifImageViewEx.com.foxykeep.datadroid.exception.ConnectionException;
import external.GifImageViewEx.com.foxykeep.datadroid.exception.CustomRequestException;
import external.GifImageViewEx.com.foxykeep.datadroid.exception.DataException;
import external.GifImageViewEx.com.foxykeep.datadroid.requestmanager.Request;
import external.GifImageViewEx.com.foxykeep.datadroid.service.RequestService.Operation;
import external.GifImageViewEx.net.frakbot.imageviewex.ImageViewNext;
import external.GifImageViewEx.net.frakbot.imageviewex.requestmanager.ImageViewExRequestFactory;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.util.LruCache;

/**
 * Operation to search for an image in the in-memory cache. Requested input: -
 * ImageMemCacheOperation.PARAM_IMAGE_URL, the URL of the image Given output: -
 * ImageViewExRequestFactory.BUNDLE_EXTRA_OBJECT, the byte array of the image -
 * ImageViewExRequestFactory.BUNDLE_EXTRA_IMAGE_URL, the requested URL of the
 * image
 * 
 * @deprecated Retrieving in an async way from the mem cache is slow.
 * @author Francesco Pontillo
 */
public class ImageMemCacheOperation implements Operation {

    public static final String PARAM_IMAGE_URL = "net.frakbot.imageviewex.extra.url";

    @Override
    public Bundle execute(Context context, Request request)
            throws ConnectionException, DataException, CustomRequestException {
        // Get the URL from the input Bundle
        String url = request.getString(PARAM_IMAGE_URL);
        if (url == null || url.equals(""))
            throw new DataException("MEM CACHE: Empty URL " + url);

        // Initializes the caches, if they're not initialized already
        ImageViewNext.initCaches(context);

        LruCache<String, byte[]> cache = ImageViewNext.getMemCache();
        byte[] image = cache.get(url);

        Bundle b = new Bundle();
        b.putByteArray(ImageViewExRequestFactory.BUNDLE_EXTRA_OBJECT, image);
        b.putString(ImageViewExRequestFactory.BUNDLE_EXTRA_IMAGE_URL, url);
        return b;
    }

}