Android Open Source - Scanner-For-Zotero Google Books Handler

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License

The source code is released under:

GNU General Public License

Java Source Code

/** 
 * Copyright 2011 John M. Schanck// w  ww  .  j a v  a 2s .c  o  m
 * 
 * ScannerForZotero is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * ScannerForZotero is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with ScannerForZotero.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.ale.scanner.zotero.web.googlebooks;

import org.ale.scanner.zotero.PendingListAdapter;
import org.ale.scanner.zotero.web.APIHandler;
import org.ale.scanner.zotero.web.APIRequest;
import org.apache.http.StatusLine;
import org.json.JSONArray;
import org.json.JSONObject;

public class GoogleBooksHandler extends APIHandler{

    private static GoogleBooksHandler mInstance = null;

    public static GoogleBooksHandler getInstance(){
        if(mInstance == null) {
            mInstance = new GoogleBooksHandler();
            APIHandler.HANDLERS.add(mInstance);
        }
        return mInstance;
    }

    // APIHandler.MAIN is guaranteed to be non-null
    // when these methods are called
    protected void onStart(APIRequest req) {
        
    }

    protected void onProgress(APIRequest req, int percent) {
        
    }

    protected void onStatusLine(APIRequest req, StatusLine status) {
        String id = req.getExtra().getString(GoogleBooksAPIClient.EXTRA_ISBN);
        int statusCode = status.getStatusCode();
        if(statusCode >= 400) {
            int errReason;
            switch(statusCode){
            case 400:
                errReason = PendingListAdapter.STATUS_BAD_REQUEST;
                break;
            case 403:
                errReason = PendingListAdapter.STATUS_QUOTA_EXCEEDED;
                break;
            case 500:
                errReason = PendingListAdapter.STATUS_SERVER_ERROR;
                break;
            default:
                errReason = PendingListAdapter.STATUS_FAILED;
                break;
            }
            APIHandler.MAIN.bibFetchFailure(id, errReason);
        }
    }

    protected void onException(APIRequest req, Exception exc) {
        String id = req.getExtra().getString(GoogleBooksAPIClient.EXTRA_ISBN);
        exc.printStackTrace();
        //TODO: Be more helpful here, might not be a network issue
        APIHandler.MAIN.bibFetchFailure(id, PendingListAdapter.STATUS_NO_NETWORK);
    }

    protected void onSuccess(APIRequest req, final String res){
        final String id = req.getExtra().getString(GoogleBooksAPIClient.EXTRA_ISBN);
        new Thread(new Runnable() {
            public void run(){
                // Extract bibliographic information from Google's response and
                // put it in a format we can submit to Zotero later.
                final JSONObject translated =
                        GoogleBooksAPIClient.translateJsonResponse(id, res);

                final boolean failed;
                final int reason;
                if(translated == null) {
                    failed = true;
                    reason = PendingListAdapter.STATUS_NOT_FOUND;
                }else{    
                    JSONArray items = translated.optJSONArray("items");
                    if(items == null){
                        failed = true;
                        reason = PendingListAdapter.STATUS_FAILED;
                    }else if(items.length() == 0){
                        failed = true;
                        reason = PendingListAdapter.STATUS_NOT_FOUND;
                    }else{
                        failed = false;
                        reason = 0; // won't be used.
                    }
                }

                // Since that might have taken some time, check that the 
                // activity is still around and post the BibInfo.
                checkActivityAndRun(new Runnable(){
                    public void run(){
                        if(failed){
                            APIHandler.MAIN.bibFetchFailure(id, reason);
                        }else{
                            APIHandler.MAIN.bibFetchSuccess(id, translated);
                        }
                    }
                });
            }
        }).start();
    }
}

Java Source Code List

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