com.commonsware.empub.ModelFragment.java Source code

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Here is the source code for com.commonsware.empub.ModelFragment.java

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/***
  Copyright (c) 2012 CommonsWare, LLC
  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.commonsware.empub;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import com.actionbarsherlock.app.SherlockFragment;
import org.json.JSONObject;

public class ModelFragment extends SherlockFragment {
    private SharedPreferences prefs = null;
    private BookContents contents = null;
    private PrefsLoadTask prefsTask = null;
    private ContentsLoadTask contentsTask = null;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        setRetainInstance(true);
        deliverModel();
    }

    SharedPreferences getPrefs() {
        return (prefs);
    }

    BookContents getContents() {
        return (contents);
    }

    synchronized private void deliverModel() {
        if (prefs != null && contents != null) {
            if (getActivity() != null) {
                ((EmPubActivity) getActivity()).setupPager(prefs, contents);
            }
        } else {
            if (prefs == null && prefsTask == null) {
                prefsTask = new PrefsLoadTask();
                executeAsyncTask(prefsTask, getActivity().getApplicationContext());
            }

            if (contents == null && contentsTask == null) {
                contentsTask = new ContentsLoadTask();
                executeAsyncTask(contentsTask, getActivity().getApplicationContext());
            }
        }
    }

    @TargetApi(11)
    static public <T> void executeAsyncTask(AsyncTask<T, ?, ?> task, T... params) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
        } else {
            task.execute(params);
        }
    }

    private class PrefsLoadTask extends AsyncTask<Context, Void, Void> {
        SharedPreferences localPrefs = null;

        @Override
        protected Void doInBackground(Context... ctxt) {
            localPrefs = PreferenceManager.getDefaultSharedPreferences(ctxt[0]);
            localPrefs.getAll();

            return (null);
        }

        @Override
        public void onPostExecute(Void arg0) {
            ModelFragment.this.prefs = localPrefs;
            ModelFragment.this.prefsTask = null;
            deliverModel();
        }
    }

    private class ContentsLoadTask extends AsyncTask<Context, Void, Void> {
        private BookContents localContents = null;
        private Exception e = null;

        @Override
        protected Void doInBackground(Context... ctxt) {
            //      File update=
            //          new File(
            //                   Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),
            //                   DownloadCheckTask.UPDATE_FILENAME);
            //      
            //      if (update.exists()) {
            //        update.delete();
            //      }

            try {
                StringBuilder buf = new StringBuilder();
                InputStream json = ctxt[0].getResources().getAssets().open("book/contents.json");
                BufferedReader in = new BufferedReader(new InputStreamReader(json));
                String str;

                while ((str = in.readLine()) != null) {
                    buf.append(str);
                }

                in.close();

                localContents = new BookContents(new JSONObject(buf.toString()));
            } catch (Exception e) {
                this.e = e;
            }

            return (null);
        }

        @Override
        public void onPostExecute(Void arg0) {
            if (e == null) {
                ModelFragment.this.contents = localContents;
                ModelFragment.this.contentsTask = null;
                deliverModel();
            } else {
                Log.e(getClass().getSimpleName(), "Exception loading contents", e);
            }
        }
    }
}