com.wms.opensource.images3android.task.LoadImagesTask.java Source code

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Here is the source code for com.wms.opensource.images3android.task.LoadImagesTask.java

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/*
 * Copyright 2015 Waterloo Mobile Studio
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wms.opensource.images3android.task;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.client.ClientProtocolException;

import com.wms.opensource.images3android.R;
import com.wms.opensource.images3android.activity.ImageListFragmentActivity;
import com.wms.opensource.images3android.cache.ImageCache;
import com.wms.opensource.images3android.handler.HandlerMessage;
import com.wms.opensource.images3android.images3.ImageS3Service;
import com.wms.opensource.images3android.images3.entity.Image;
import com.wms.opensource.images3android.images3.entity.ImageResult;
import com.wms.opensource.images3android.images3.entity.ImageCollection;
import com.wms.opensource.images3android.util.DialogUtil;
import com.wms.opensource.images3android.util.FileUtil;
import com.wms.opensource.images3android.util.JsonUtil;
import com.wms.opensource.images3android.util.MessageUtil;
import com.wms.opensource.images3android.util.PersistFileNameUtil;
import com.wms.opensource.images3android.util.StorageUtil;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Handler;

public class LoadImagesTask extends AsyncTask<Void, Void, ImageCollection> {

    private Context context = null;
    private Handler handler = null;
    private String baseUrl = "";
    private String imagePlantId = "";
    private String pageToken = "";
    private int page = 1;

    private ProgressDialog progressDialog = null;

    private List<Image> images = new ArrayList<Image>();

    public LoadImagesTask(Context context, Handler handler, String baseUrl, String imagePlantId, String pageToken,
            int page) {
        this.context = context;
        this.handler = handler;
        this.baseUrl = baseUrl;
        this.imagePlantId = imagePlantId;
        this.pageToken = pageToken;
        this.page = page;
    }

    protected void onPreExecute() {
        progressDialog = DialogUtil.showWaitingProgressDialog(context, ProgressDialog.STYLE_SPINNER,
                context.getString(R.string.loadingImages), false);
    }

    protected ImageCollection doInBackground(Void... params) {
        String imageCollectionString = "";
        ImageCollection imageCollection = null;
        try {
            if (page == 1) {
                imageCollectionString = ImageS3Service.retrieveImages(baseUrl, imagePlantId, "");
            } else {
                imageCollectionString = ImageS3Service.retrieveImages(baseUrl, imagePlantId, pageToken);
            }
            if (imageCollectionString != null) {
                FileUtil.writeStringToFile(imageCollectionString, StorageUtil.getTempDirectory(context),
                        PersistFileNameUtil.getImagesPersistFileName(imagePlantId, page),
                        context.getString(R.string.charSetName));
                imageCollection = (ImageCollection) JsonUtil.deserialize(imageCollectionString, "",
                        ImageCollection.class);
                for (ImageResult result : imageCollection.getResults()) {
                    Image image = new Image(baseUrl, result);
                    images.add(image);
                }

                // Keep in cache
                ImageCache.putImageCollection(page, imageCollection);
            }
        } catch (ClientProtocolException e) {

        } catch (IOException e) {

        }

        return imageCollection;
    }

    @Override
    protected void onPostExecute(ImageCollection result) {
        if (progressDialog != null && progressDialog.isShowing() == true)
            progressDialog.dismiss();

        if (result != null) {
            if (page == 1) {
                ImageListFragmentActivity.pageTokens.set(1, result.getPage().getNext());
            } else if (page == ImageListFragmentActivity.pageTokens.size()) {
                // Do nothing
            } else {
                ImageListFragmentActivity.pageTokens.set(page - 2,
                        result.getPage().getPrev() == null ? "" : result.getPage().getPrev());
                ImageListFragmentActivity.pageTokens.set(page, result.getPage().getNext());
            }
            MessageUtil.sendHandlerMessage(handler, HandlerMessage.IMAGES_LOADED);
        } else {
            DialogUtil.showExceptionAlertDialog(context, context.getString(R.string.loadImagesFailedTitle),
                    context.getString(R.string.loadImagesFailed));
        }
    }

    public List<Image> getImages() {
        return images;
    }
}