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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import org.mozilla.gecko.util.GeckoEventListener;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
import java.util.HashMap;
import java.util.Map;
/**
* Helper class to get/set gecko prefs.
*/
public final class PrefsHelper {
private static final String LOGTAG = "GeckoPrefsHelper";
private static boolean sRegistered = false;
private static final Map<Integer, PrefHandler> sCallbacks = new HashMap<Integer, PrefHandler>();
private static int sUniqueRequestId = 1;
public static int getPref(String prefName, PrefHandler callback) {
JSONArray prefs = new JSONArray();
prefs.put(prefName);
return getPrefs(prefs, callback);
}
public static int getPrefs(String[] prefNames, PrefHandler callback) {
JSONArray prefs = new JSONArray();
for (String p : prefNames) {
prefs.put(p);
}
return getPrefs(prefs, callback);
}
public static int getPrefs(JSONArray prefNames, PrefHandler callback) {
int requestId;
synchronized (PrefsHelper.class) {
ensureRegistered();
requestId = sUniqueRequestId++;
sCallbacks.put(requestId, callback);
}
GeckoEvent event;
try {
JSONObject message = new JSONObject();
message.put("requestId", Integer.toString(requestId));
message.put("preferences", prefNames);
event = GeckoEvent.createBroadcastEvent(callback.isObserver() ?
"Preferences:Observe" : "Preferences:Get", message.toString());
GeckoAppShell.sendEventToGecko(event);
} catch (Exception e) {
Log.e(LOGTAG, "Error while composing Preferences:" +
(callback.isObserver() ? "Observe" : "Get") + " message", e);
// if we failed to send the message, drop our reference to the callback because
// otherwise it will leak since we will never get the response
synchronized (PrefsHelper.class) {
sCallbacks.remove(requestId);
}
return -1;
}
return requestId;
}
private static void ensureRegistered() {
if (sRegistered) {
return;
}
GeckoAppShell.getEventDispatcher().registerEventListener("Preferences:Data", new GeckoEventListener() {
@Override public void handleMessage(String event, JSONObject message) {
try {
PrefHandler callback;
synchronized (PrefsHelper.class) {
try {
int requestId = message.getInt("requestId");
callback = sCallbacks.get(requestId);
if (callback != null && !callback.isObserver()) {
sCallbacks.remove(requestId);
}
} catch (Exception e) {
callback = null;
}
}
if (callback == null) {
Log.d(LOGTAG, "Preferences:Data message had an unknown requestId; ignoring");
return;
}
JSONArray jsonPrefs = message.getJSONArray("preferences");
for (int i = 0; i < jsonPrefs.length(); i++) {
JSONObject pref = jsonPrefs.getJSONObject(i);
String name = pref.getString("name");
String type = pref.getString("type");
try {
if ("bool".equals(type)) {
callback.prefValue(name, pref.getBoolean("value"));
} else if ("int".equals(type)) {
callback.prefValue(name, pref.getInt("value"));
} else if ("string".equals(type)) {
callback.prefValue(name, pref.getString("value"));
} else {
Log.e(LOGTAG, "Unknown pref value type [" + type + "] for pref [" + name + "]");
}
} catch (Exception e) {
Log.e(LOGTAG, "Handler for preference [" + name + "] threw exception", e);
}
}
callback.finish();
} catch (Exception e) {
Log.e(LOGTAG, "Error handling Preferences:Data message", e);
}
}
});
sRegistered = true;
}
public static void setPref(String pref, Object value) {
if (pref == null || pref.length() == 0) {
throw new IllegalArgumentException("Pref name must be non-empty");
}
try {
JSONObject jsonPref = new JSONObject();
jsonPref.put("name", pref);
if (value instanceof Boolean) {
jsonPref.put("type", "bool");
jsonPref.put("value", ((Boolean)value).booleanValue());
} else if (value instanceof Integer) {
jsonPref.put("type", "int");
jsonPref.put("value", ((Integer)value).intValue());
} else {
jsonPref.put("type", "string");
jsonPref.put("value", String.valueOf(value));
}
GeckoEvent event = GeckoEvent.createBroadcastEvent("Preferences:Set", jsonPref.toString());
GeckoAppShell.sendEventToGecko(event);
} catch (JSONException e) {
Log.e(LOGTAG, "Error setting pref [" + pref + "]", e);
}
}
public static void removeObserver(int requestId) {
if (requestId < 0) {
throw new IllegalArgumentException("Invalid request ID");
}
synchronized (PrefsHelper.class) {
PrefHandler callback = sCallbacks.remove(requestId);
if (callback == null) {
Log.e(LOGTAG, "Unknown request ID " + requestId);
return;
}
}
GeckoEvent event = GeckoEvent.createBroadcastEvent("Preferences:RemoveObserver",
Integer.toString(requestId));
GeckoAppShell.sendEventToGecko(event);
}
public interface PrefHandler {
void prefValue(String pref, boolean value);
void prefValue(String pref, int value);
void prefValue(String pref, String value);
boolean isObserver();
void finish();
}
public static abstract class PrefHandlerBase implements PrefHandler {
@Override
public void prefValue(String pref, boolean value) {
Log.w(LOGTAG, "Unhandled boolean value for pref [" + pref + "]");
}
@Override
public void prefValue(String pref, int value) {
Log.w(LOGTAG, "Unhandled int value for pref [" + pref + "]");
}
@Override
public void prefValue(String pref, String value) {
Log.w(LOGTAG, "Unhandled String value for pref [" + pref + "]");
}
@Override
public void finish() {
}
@Override
public boolean isObserver() {
return false;
}
}
}
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