Java tutorial
/* * Copyright 2010 Peter Kuterna * * 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 fr.mixit.android.io; import android.content.ContentProviderOperation; import android.content.ContentResolver; import android.database.Cursor; import android.net.Uri; import android.util.Log; import fr.mixit.android.provider.MixItContract; import fr.mixit.android.utils.Lists; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.HashSet; /** * Handle a remote {@link org.json.JSONArray} that defines a set of {@link MixItContract.Speakers} * entries. */ public class RemoteSpeakersHandler extends JSONHandler { private static final String TAG = "SpeakersHandler"; public RemoteSpeakersHandler() { super(MixItContract.CONTENT_AUTHORITY); } @Override public ArrayList<ContentProviderOperation> parse(ArrayList<JSONArray> entries, ContentResolver resolver) throws JSONException { final ArrayList<ContentProviderOperation> batch = Lists.newArrayList(); final HashSet<String> speakerIds = new HashSet<String>(); int nrEntries = 0; for (JSONArray speakers : entries) { Log.d(TAG, "Retrieved " + speakers.length() + " speaker entries."); nrEntries += speakers.length(); for (int i = 0; i < speakers.length(); i++) { JSONObject speaker = speakers.getJSONObject(i); String id = speaker.getString("id"); // final String speakerId = sanitizeId(id); final Uri speakerUri = MixItContract.Speakers.buildSpeakerUri(id); speakerIds.add(id); boolean speakerUpdated = false; boolean newSpeaker = false; boolean build = false; ContentProviderOperation.Builder builder; if (isRowExisting(speakerUri, SpeakersQuery.PROJECTION, resolver)) { builder = ContentProviderOperation.newUpdate(speakerUri); speakerUpdated = isSpeakerUpdated(speakerUri, speaker, resolver); } else { newSpeaker = true; builder = ContentProviderOperation.newInsert(MixItContract.Speakers.CONTENT_URI); builder.withValue(MixItContract.Speakers.SPEAKER_ID, id); build = true; } if (newSpeaker || speakerUpdated) { builder.withValue(MixItContract.Speakers.LAST_NAME, speaker.getString("lastName")); builder.withValue(MixItContract.Speakers.FIRST_NAME, speaker.getString("firstName")); builder.withValue(MixItContract.Speakers.BIO, speaker.getString("bio")); builder.withValue(MixItContract.Speakers.LINKEDIN, speaker.getString("linkedin")); builder.withValue(MixItContract.Speakers.TWITTER, speaker.getString("twitter")); builder.withValue(MixItContract.Speakers.BLOG, speaker.getString("blog")); builder.withValue(MixItContract.Speakers.COMPANY, speaker.getString("company")); builder.withValue(MixItContract.Speakers.IMAGE_URL, speaker.getString("urlImage")); build = true; } if (build) batch.add(builder.build()); } } // delete sessions with speakers deleted if (isRemoteSync() && nrEntries > 0) { for (String lostId : getLostIds(speakerIds, MixItContract.Speakers.CONTENT_URI, SpeakersQuery.PROJECTION, SpeakersQuery.SPEAKER_ID, resolver)) { Uri deleteUri = MixItContract.Speakers.buildSessionsDirUri(lostId); batch.add(ContentProviderOperation.newDelete(deleteUri).build()); deleteUri = MixItContract.Speakers.buildSpeakerUri(lostId); batch.add(ContentProviderOperation.newDelete(deleteUri).build()); } } return batch; } private static boolean isSpeakerUpdated(Uri uri, JSONObject speaker, ContentResolver resolver) throws JSONException { final Cursor cursor = resolver.query(uri, SpeakersQuery.PROJECTION, null, null, null); try { if (!cursor.moveToFirst()) return false; final String curFirstName = cursor.getString(SpeakersQuery.FIRST_NAME).toLowerCase().trim(); final String curLastName = cursor.getString(SpeakersQuery.LAST_NAME).toLowerCase().trim(); final String curBio = cursor.getString(SpeakersQuery.BIO).toLowerCase().trim(); final String curCompany = cursor.getString(SpeakersQuery.COMPANY).toLowerCase().trim(); final String curLinkedIn = cursor.getString(SpeakersQuery.LINKEDIN).toLowerCase().trim(); final String curTwitter = cursor.getString(SpeakersQuery.TWITTER).toLowerCase().trim(); final String curBlog = cursor.getString(SpeakersQuery.BLOG).toLowerCase().trim(); final String newFirstName = speaker.has("firstName") ? speaker.getString("firstName").toLowerCase().trim() : curFirstName; final String newLastName = speaker.has("lastName") ? speaker.getString("lastName").toLowerCase().trim() : curLastName; final String newBio = speaker.has("bio") ? speaker.getString("bio").toLowerCase().trim() : curBio; final String newCompany = speaker.has("company") ? speaker.getString("company").toLowerCase().trim() : curCompany; final String newLinkedIn = speaker.has("linkedin") ? speaker.getString("linkedin").toLowerCase().trim() : curLinkedIn; final String newTwitter = speaker.has("twitter") ? speaker.getString("twitter").toLowerCase().trim() : curTwitter; final String newBlog = speaker.has("blog") ? speaker.getString("blog").toLowerCase().trim() : curBlog; return (!curFirstName.equals(newFirstName) || !curLastName.equals(newLastName) || !curBio.equals(newBio) || !curCompany.equals(newCompany) || !curLinkedIn.equals(newLinkedIn) || !curTwitter.equals(newTwitter) || !curBlog.equals(newBlog)); } finally { cursor.close(); } } private interface SpeakersQuery { String[] PROJECTION = { MixItContract.Speakers.SPEAKER_ID, MixItContract.Speakers.FIRST_NAME, MixItContract.Speakers.LAST_NAME, MixItContract.Speakers.BIO, MixItContract.Speakers.COMPANY, MixItContract.Speakers.LINKEDIN, MixItContract.Speakers.TWITTER, MixItContract.Speakers.BLOG, }; int SPEAKER_ID = 0; int FIRST_NAME = 1; int LAST_NAME = 2; int BIO = 3; int COMPANY = 4; int LINKEDIN = 5; int TWITTER = 6; int BLOG = 7; } }