michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko;
michael@0: 
michael@0: import org.mozilla.gecko.util.GeckoEventListener;
michael@0: 
michael@0: import org.json.JSONArray;
michael@0: import org.json.JSONException;
michael@0: import org.json.JSONObject;
michael@0: 
michael@0: import android.util.Log;
michael@0: import android.util.SparseArray;
michael@0: 
michael@0: import java.util.ArrayList;
michael@0: 
michael@0: /**
michael@0:  * Helper class to get/set gecko prefs.
michael@0:  */
michael@0: public final class PrefsHelper {
michael@0:     private static final String LOGTAG = "GeckoPrefsHelper";
michael@0: 
michael@0:     private static boolean sRegistered = false;
michael@0:     private static final SparseArray<PrefHandler> sCallbacks = new SparseArray<PrefHandler>();
michael@0:     private static int sUniqueRequestId = 1;
michael@0: 
michael@0:     public static int getPref(String prefName, PrefHandler callback) {
michael@0:         return getPrefsInternal(new String[] { prefName }, callback);
michael@0:     }
michael@0: 
michael@0:     public static int getPrefs(String[] prefNames, PrefHandler callback) {
michael@0:         return getPrefsInternal(prefNames, callback);
michael@0:     }
michael@0: 
michael@0:     public static int getPrefs(ArrayList<String> prefNames, PrefHandler callback) {
michael@0:         return getPrefsInternal(prefNames.toArray(new String[prefNames.size()]), callback);
michael@0:     }
michael@0: 
michael@0:     private static int getPrefsInternal(String[] prefNames, PrefHandler callback) {
michael@0:         int requestId;
michael@0:         synchronized (PrefsHelper.class) {
michael@0:             ensureRegistered();
michael@0: 
michael@0:             requestId = sUniqueRequestId++;
michael@0:             sCallbacks.put(requestId, callback);
michael@0:         }
michael@0: 
michael@0:         GeckoEvent event;
michael@0:         if (callback.isObserver()) {
michael@0:             event = GeckoEvent.createPreferencesObserveEvent(requestId, prefNames);
michael@0:         } else {
michael@0:             event = GeckoEvent.createPreferencesGetEvent(requestId, prefNames);
michael@0:         }
michael@0:         GeckoAppShell.sendEventToGecko(event);
michael@0: 
michael@0:         return requestId;
michael@0:     }
michael@0: 
michael@0:     private static void ensureRegistered() {
michael@0:         if (sRegistered) {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         GeckoAppShell.getEventDispatcher().registerEventListener("Preferences:Data", new GeckoEventListener() {
michael@0:             @Override public void handleMessage(String event, JSONObject message) {
michael@0:                 try {
michael@0:                     PrefHandler callback;
michael@0:                     synchronized (PrefsHelper.class) {
michael@0:                         try {
michael@0:                             int requestId = message.getInt("requestId");
michael@0:                             callback = sCallbacks.get(requestId);
michael@0:                             if (callback != null && !callback.isObserver()) {
michael@0:                                 sCallbacks.delete(requestId);
michael@0:                             }
michael@0:                         } catch (Exception e) {
michael@0:                             callback = null;
michael@0:                         }
michael@0:                     }
michael@0:                     if (callback == null) {
michael@0:                         Log.d(LOGTAG, "Preferences:Data message had an unknown requestId; ignoring");
michael@0:                         return;
michael@0:                     }
michael@0: 
michael@0:                     JSONArray jsonPrefs = message.getJSONArray("preferences");
michael@0:                     for (int i = 0; i < jsonPrefs.length(); i++) {
michael@0:                         JSONObject pref = jsonPrefs.getJSONObject(i);
michael@0:                         String name = pref.getString("name");
michael@0:                         String type = pref.getString("type");
michael@0:                         try {
michael@0:                             if ("bool".equals(type)) {
michael@0:                                 callback.prefValue(name, pref.getBoolean("value"));
michael@0:                             } else if ("int".equals(type)) {
michael@0:                                 callback.prefValue(name, pref.getInt("value"));
michael@0:                             } else if ("string".equals(type)) {
michael@0:                                 callback.prefValue(name, pref.getString("value"));
michael@0:                             } else {
michael@0:                                 Log.e(LOGTAG, "Unknown pref value type [" + type + "] for pref [" + name + "]");
michael@0:                             }
michael@0:                         } catch (Exception e) {
michael@0:                             Log.e(LOGTAG, "Handler for preference [" + name + "] threw exception", e);
michael@0:                         }
michael@0:                     }
michael@0:                     callback.finish();
michael@0:                 } catch (Exception e) {
michael@0:                     Log.e(LOGTAG, "Error handling Preferences:Data message", e);
michael@0:                 }
michael@0:             }
michael@0:         });
michael@0:         sRegistered = true;
michael@0:     }
michael@0: 
michael@0:     public static void setPref(String pref, Object value) {
michael@0:         if (pref == null || pref.length() == 0) {
michael@0:             throw new IllegalArgumentException("Pref name must be non-empty");
michael@0:         }
michael@0: 
michael@0:         try {
michael@0:             JSONObject jsonPref = new JSONObject();
michael@0:             jsonPref.put("name", pref);
michael@0:             if (value instanceof Boolean) {
michael@0:                 jsonPref.put("type", "bool");
michael@0:                 jsonPref.put("value", ((Boolean)value).booleanValue());
michael@0:             } else if (value instanceof Integer) {
michael@0:                 jsonPref.put("type", "int");
michael@0:                 jsonPref.put("value", ((Integer)value).intValue());
michael@0:             } else {
michael@0:                 jsonPref.put("type", "string");
michael@0:                 jsonPref.put("value", String.valueOf(value));
michael@0:             }
michael@0: 
michael@0:             GeckoEvent event = GeckoEvent.createBroadcastEvent("Preferences:Set", jsonPref.toString());
michael@0:             GeckoAppShell.sendEventToGecko(event);
michael@0:         } catch (JSONException e) {
michael@0:             Log.e(LOGTAG, "Error setting pref [" + pref + "]", e);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     public static void removeObserver(int requestId) {
michael@0:         if (requestId < 0) {
michael@0:             throw new IllegalArgumentException("Invalid request ID");
michael@0:         }
michael@0: 
michael@0:         synchronized (PrefsHelper.class) {
michael@0:             PrefHandler callback = sCallbacks.get(requestId);
michael@0:             sCallbacks.delete(requestId);
michael@0: 
michael@0:             if (callback == null) {
michael@0:                 Log.e(LOGTAG, "Unknown request ID " + requestId);
michael@0:                 return;
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         GeckoEvent event = GeckoEvent.createBroadcastEvent("Preferences:RemoveObserver",
michael@0:                                                            Integer.toString(requestId));
michael@0:         GeckoAppShell.sendEventToGecko(event);
michael@0:     }
michael@0: 
michael@0:     public interface PrefHandler {
michael@0:         void prefValue(String pref, boolean value);
michael@0:         void prefValue(String pref, int value);
michael@0:         void prefValue(String pref, String value);
michael@0:         boolean isObserver();
michael@0:         void finish();
michael@0:     }
michael@0: 
michael@0:     public static abstract class PrefHandlerBase implements PrefHandler {
michael@0:         @Override
michael@0:         public void prefValue(String pref, boolean value) {
michael@0:             Log.w(LOGTAG, "Unhandled boolean value for pref [" + pref + "]");
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void prefValue(String pref, int value) {
michael@0:             Log.w(LOGTAG, "Unhandled int value for pref [" + pref + "]");
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void prefValue(String pref, String value) {
michael@0:             Log.w(LOGTAG, "Unhandled String value for pref [" + pref + "]");
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public void finish() {
michael@0:         }
michael@0: 
michael@0:         @Override
michael@0:         public boolean isObserver() {
michael@0:             return false;
michael@0:         }
michael@0:     }
michael@0: }