gecko/mobile/android/base/WebAppAllocator.java
2012-07-17 17:54:54 -07:00

94 lines
2.7 KiB
Java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; 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 android.content.Context;
import android.content.SharedPreferences;
public class WebAppAllocator {
// The number of WebApp# and WEBAPP# activites/apps/intents
private final static int MAX_WEB_APPS = 100;
protected static GeckoApp sContext = null;
protected static WebAppAllocator sInstance = null;
public static WebAppAllocator getInstance() {
return getInstance(GeckoApp.mAppContext);
}
public static synchronized WebAppAllocator getInstance(Context cx) {
if (sInstance == null) {
if (!(cx instanceof GeckoApp))
throw new RuntimeException("Context needs to be a GeckoApp");
sContext = (GeckoApp) cx;
sInstance = new WebAppAllocator(cx);
}
if (cx != sContext)
throw new RuntimeException("Tried to get WebAppAllocator instance for different context than it was created for");
return sInstance;
}
SharedPreferences mPrefs;
protected WebAppAllocator(Context context) {
mPrefs = context.getSharedPreferences("webapps", Context.MODE_PRIVATE | Context.MODE_MULTI_PROCESS);
}
static String appKey(int index) {
return "app" + index;
}
public synchronized int findAndAllocateIndex(String app) {
int index = getIndexForApp(app);
if (index != -1)
return index;
for (int i = 0; i < MAX_WEB_APPS; ++i) {
if (!mPrefs.contains(appKey(i))) {
// found unused index i
mPrefs.edit()
.putString(appKey(i), app)
.apply();
return i;
}
}
// no more apps!
return -1;
}
public synchronized int getIndexForApp(String app) {
for (int i = 0; i < MAX_WEB_APPS; ++i) {
if (mPrefs.getString(appKey(i), "").equals(app)) {
return i;
}
}
return -1;
}
public synchronized String getAppForIndex(int index) {
return mPrefs.getString(appKey(index), null);
}
public synchronized int releaseIndexForApp(String app) {
int index = getIndexForApp(app);
if (index == -1)
return -1;
releaseIndex(index);
return index;
}
public synchronized void releaseIndex(int index) {
mPrefs.edit()
.remove(appKey(index))
.apply();
}
}