Java tutorial
/* * Copyright 2014 Google Inc. All rights reserved. * * 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.google.samples.apps.iosched.server.schedule.model; import static com.google.samples.apps.iosched.server.schedule.model.DataModelHelper.set; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParser; import com.google.gson.JsonPrimitive; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Collections; import java.util.GregorianCalendar; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Random; import java.util.Set; import java.util.TimeZone; /** * When running on DEBUG mode, change some data in the sessions. * */ public class DebugDataExtractorHelper { protected static int[][] sessionTimes = { { 9, 30, 9, 45 }, { 9, 15, 9, 55 }, { 10, 0, 11, 0 }, { 11, 5, 11, 55 }, { 13, 0, 13, 55 }, { 14, 5, 15, 0 }, { 14, 30, 15, 0 }, { 15, 0, 16, 0 }, { 16, 5, 17, 0 } }; protected static int[] days = { 25, 26 }; protected static String[] rooms = { "110", "120", "130", "210", "220", "230" }; protected static HashMap<String, JsonObject> tagById; protected static ArrayList<JsonObject> topicTags; protected static JsonObject[] themeTags = { new JsonParser().parse( "{\"category\": \"THEME\",\"tag\": \"THEME_DESIGN\",\"name\": \"Design\", \"order_in_category\": 1, \"abstract\": \"\"}") .getAsJsonObject(), new JsonParser().parse( "{\"category\": \"THEME\",\"tag\": \"THEME_DEVELOP\",\"name\": \"Develop\", \"order_in_category\": 2, \"abstract\": \"\"}") .getAsJsonObject(), new JsonParser().parse( "{\"category\": \"THEME\",\"tag\": \"THEME_DISTRIBUTE\",\"name\": \"Distribute\", \"order_in_category\": 3, \"abstract\": \"\"}") .getAsJsonObject(), }; protected static float[] themeDistribution = { 0.25f, 0.5f, 0.25f }; protected static JsonObject[] typeTags = { new JsonParser().parse( "{\"category\": \"TYPE\",\"tag\": \"TYPE_SESSION\",\"name\": \"Session\", \"order_in_category\": 1, \"abstract\": \"\"}") .getAsJsonObject(), new JsonParser().parse( "{\"category\": \"TYPE\",\"tag\": \"TYPE_CODELAB\",\"name\": \"Codelab\", \"order_in_category\": 2, \"abstract\": \"\"}") .getAsJsonObject(), new JsonParser().parse( "{\"category\": \"TYPE\",\"tag\": \"TYPE_OFFICE_HOURS\",\"name\": \"Office Hours\", \"order_in_category\": 3, \"abstract\": \"\"}") .getAsJsonObject(), new JsonParser().parse( "{\"category\": \"TYPE\",\"tag\": \"TYPE_BOX_TALKS\",\"name\": \"'Box Talks\", \"order_in_category\": 4, \"abstract\": \"\"}") .getAsJsonObject(), }; protected static float[] typeDistribution = { 0.70f, 0.1f, 0.1f, 0.1f }; private static Random r = new Random(); public static final void changeRooms(JsonArray allRooms) { for (String room : rooms) { JsonObject dest = new JsonObject(); JsonPrimitive roomId = new JsonPrimitive(room); JsonPrimitive roomName = new JsonPrimitive("Room " + room); DataModelHelper.set(roomId, dest, OutputJsonKeys.Rooms.id); DataModelHelper.set(roomName, dest, OutputJsonKeys.Rooms.name); allRooms.add(dest); } } public static final void changeCategories(HashMap<String, JsonObject> categoryToTagMap, JsonArray allTags) { topicTags = new ArrayList<JsonObject>(); Iterator<Map.Entry<String, JsonObject>> it = categoryToTagMap.entrySet().iterator(); while (it.hasNext()) { JsonObject tag = it.next().getValue(); String category = tag.get(OutputJsonKeys.Tags.category.name()).getAsString(); if ("TOPIC".equals(category)) { topicTags.add(tag); } else { it.remove(); } } for (JsonObject tag : themeTags) { allTags.add(tag); } for (JsonObject tag : typeTags) { allTags.add(tag); } } static SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); public static final void changeSession(JsonObject session, Set<String> usedTags) { int hash = session.get(OutputJsonKeys.Sessions.id.name()).getAsString().hashCode(); r.setSeed(hash); // timeslot: int day = days[uniform(2)]; int[] timeSlot = sessionTimes[uniform(sessionTimes.length)]; Calendar start = new GregorianCalendar(2014, Calendar.JUNE, day, timeSlot[0], timeSlot[1], 0); Calendar end = new GregorianCalendar(2014, Calendar.JUNE, day, timeSlot[2], timeSlot[3], 0); long offset = TimeZone.getTimeZone("PST").getOffset(start.getTimeInMillis()); start.setTimeInMillis(start.getTimeInMillis() - offset); end.setTimeInMillis(end.getTimeInMillis() - offset); String startS = formatter.format(start.getTime()); String endS = formatter.format(end.getTime()); DataModelHelper.set(new JsonPrimitive(startS), session, OutputJsonKeys.Sessions.startTimestamp); DataModelHelper.set(new JsonPrimitive(endS), session, OutputJsonKeys.Sessions.endTimestamp); // Room: DataModelHelper.set(new JsonPrimitive(rooms[uniform(rooms.length)]), session, OutputJsonKeys.Sessions.room); JsonArray tags = new JsonArray(); // 2 random topic tags Collections.shuffle(topicTags, r); // not the most efficient, but good enough and avoid duplicates if (topicTags.size() > 0) tags.add(topicTags.get(0).get(OutputJsonKeys.Tags.tag.name())); if (topicTags.size() > 1) tags.add(topicTags.get(1).get(OutputJsonKeys.Tags.tag.name())); // 1 randomly distributed theme tag tags.add(themeTags[roullette(themeDistribution)].get(OutputJsonKeys.Tags.tag.name())); // 1 randomly distributed type tag tags.add(typeTags[roullette(typeDistribution)].get(OutputJsonKeys.Tags.tag.name())); for (JsonElement tag : tags) { usedTags.add(tag.getAsString()); } DataModelHelper.set(tags, session, OutputJsonKeys.Sessions.tags); // Livestream boolean isLiveStream = uniform(2) == 1; if (isLiveStream) { DataModelHelper.set(new JsonPrimitive("https://www.youtube.com/watch?v=dQw4w9WgXcQ"), session, OutputJsonKeys.Sessions.youtubeUrl); DataModelHelper.set(new JsonPrimitive("http://www.google.com/humans.txt"), session, OutputJsonKeys.Sessions.captionsUrl); DataModelHelper.set(new JsonPrimitive(Boolean.TRUE), session, OutputJsonKeys.Sessions.isLivestream); } else { session.remove(OutputJsonKeys.Sessions.youtubeUrl.name()); session.remove(OutputJsonKeys.Sessions.captionsUrl.name()); DataModelHelper.set(new JsonPrimitive(Boolean.FALSE), session, OutputJsonKeys.Sessions.isLivestream); } } private static int uniform(int upperBound) { return r.nextInt(upperBound); } private static int roullette(float[] distributions) { float value = r.nextFloat(); float current = 0f; for (int i = 0; i < distributions.length; i++) { current += distributions[i]; if (value <= current) { return i; } } return distributions.length - 1; } }