Java tutorial
/****************************************************************************** * Copyright (C) 2012, 2013, 2014 * Younghyung Cho. <yhcting77@gmail.com> * All rights reserved. * * This file is part of NetMBuddy * * This program is licensed under the FreeBSD license * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the FreeBSD Project. *****************************************************************************/ package free.yhc.netmbuddy.share; import static free.yhc.netmbuddy.utils.Utils.eAssert; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.database.Cursor; import free.yhc.netmbuddy.db.ColPlaylist; import free.yhc.netmbuddy.db.ColVideo; import free.yhc.netmbuddy.db.DB; import free.yhc.netmbuddy.model.Policy; import free.yhc.netmbuddy.utils.Utils; //============================================================================ //[ Data File Format (JSON) ] //{ //----- Meta data ----- //meta : { // magic : Magic string to confirm that this is NetMBuddy compatible. // type : Json Object? type. .. // version : sharing format version of this type. // : "playlist" // time : exporting? .(milliseconds) //} // //----- Data ----- //playlist : { // title : playlist title // videos : [ // { // ytid: 11-character youtube video id // title : title of the video (Exporter may change the video title.) // playtime: // volume: volume // bookmarks : bookmarks // } // ... // ] //} //============================================================================ class Json { private static final boolean DBG = false; private static final Utils.Logger P = new Utils.Logger(Json.class); // Field name constants. static final String MAGIC = "!*&@$$#$%~NetMBuddy!@@@@!%^^*#$$##"; static final String FVERSION = "version"; static final String FMETA = "meta"; static final String FPLAYLIST = "playlist"; static final String FMAGIC = "magic"; static final String FTYPE = "type"; static final String FTHUMBNAIL_YTVID = "thumbnail_ytvid"; static final String FTIME = "time"; static final String FYTID = "ytid"; static final String FAUTHOR = "author"; static final String FVOLUME = "volume"; static final String FPLAYTIME = "playtime"; static final String FBOOKMARKS = "bookmarks"; static final String FTITLE = "title"; static final String FVIDEOS = "videos"; /** * @param jo * 'meta' object * @return */ static boolean verify(JSONObject jo) { try { return MAGIC.equals(jo.getString(FMAGIC)); } catch (JSONException e) { return false; } } static JSONObject createMetaJson(Share.Type type) { JSONObject jo = new JSONObject(); try { jo.put(FMAGIC, MAGIC); jo.put(FVERSION, type.getVersion()); jo.put(FTYPE, type.name()); jo.put(FTIME, System.currentTimeMillis()); } catch (JSONException e) { jo = null; } return jo; } static JSONObject videoToJson(long vid) { final int COLI_VIDEOID = 0; final int COLI_TITLE = 1; final int COLI_AUTHOR = 2; final int COLI_VOLUME = 3; final int COLI_PLAYTIME = 4; final int COLI_BOOKMARKS = 5; Cursor c = DB.get().queryVideo(vid, new ColVideo[] { ColVideo.VIDEOID, ColVideo.TITLE, ColVideo.AUTHOR, ColVideo.VOLUME, ColVideo.PLAYTIME, ColVideo.BOOKMARKS }); if (!c.moveToFirst()) { c.close(); return null; } JSONObject jo = new JSONObject(); try { jo.put(FYTID, c.getString(COLI_VIDEOID)); jo.put(FTITLE, c.getString(COLI_TITLE)); // NOTE // Below field - author - is newly added at Database version 2 // So, we cannot sure that DB includes valid field value for them. if (Utils.isValidValue(c.getString(COLI_AUTHOR))) jo.put(FAUTHOR, c.getString(COLI_AUTHOR)); jo.put(FPLAYTIME, c.getInt(COLI_PLAYTIME)); jo.put(FBOOKMARKS, c.getString(COLI_BOOKMARKS)); int vol = c.getInt(COLI_VOLUME); if (Policy.DEFAULT_VIDEO_VOLUME != vol) jo.put(FVOLUME, vol); } catch (JSONException e) { jo = null; } c.close(); return jo; } static JSONObject playlistToJson(long plid) { final int COLI_ID = 0; Cursor c = DB.get().queryVideos(plid, new ColVideo[] { ColVideo.ID }, null, false); if (!c.moveToFirst()) { c.close(); return null; } JSONObject jo = new JSONObject(); try { jo.put(FTITLE, DB.get().getPlaylistInfo(plid, ColPlaylist.TITLE)); String thumbnailYtvid = (String) DB.get().getPlaylistInfo(plid, ColPlaylist.THUMBNAIL_YTVID); if (Utils.isValidValue(thumbnailYtvid)) jo.put(FTHUMBNAIL_YTVID, thumbnailYtvid); JSONArray jarr = new JSONArray(); do { JSONObject jov = videoToJson(c.getLong(COLI_ID)); eAssert(null != jov); jarr.put(jov); } while (c.moveToNext()); jo.put(FVIDEOS, jarr); } catch (JSONException e) { jo = null; } c.close(); return jo; } }