| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * 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 android.webkit; |
| |
| import android.os.Build; |
| import android.os.StrictMode; |
| import android.os.SystemProperties; |
| import android.util.Log; |
| |
| import dalvik.system.PathClassLoader; |
| |
| /** |
| * Top level factory, used creating all the main WebView implementation classes. |
| */ |
| class WebViewFactory { |
| // Default Provider factory class name. |
| // TODO: When the Chromium powered WebView is ready, it should be the default factory class. |
| private static final String DEFAULT_WEBVIEW_FACTORY = "android.webkit.WebViewClassic$Factory"; |
| private static final String CHROMIUM_WEBVIEW_FACTORY = |
| "com.android.webviewchromium.WebViewChromiumFactoryProvider"; |
| private static final String CHROMIUM_WEBVIEW_JAR = "/system/framework/webviewchromium.jar"; |
| |
| private static final String LOGTAG = "WebViewFactory"; |
| |
| private static final boolean DEBUG = false; |
| |
| // Cache the factory both for efficiency, and ensure any one process gets all webviews from the |
| // same provider. |
| private static WebViewFactoryProvider sProviderInstance; |
| private static final Object sProviderLock = new Object(); |
| |
| static WebViewFactoryProvider getProvider() { |
| synchronized (sProviderLock) { |
| // For now the main purpose of this function (and the factory abstraction) is to keep |
| // us honest and minimize usage of WebViewClassic internals when binding the proxy. |
| if (sProviderInstance != null) return sProviderInstance; |
| |
| // For debug builds, we allow a system property to specify that we should use the |
| // Chromium powered WebView. This enables us to switch between implementations |
| // at runtime. For user (release) builds, don't allow this. |
| if (Build.IS_DEBUGGABLE && SystemProperties.getBoolean("webview.use_chromium", false)) { |
| StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); |
| try { |
| sProviderInstance = loadChromiumProvider(); |
| if (DEBUG) Log.v(LOGTAG, "Loaded Chromium provider: " + sProviderInstance); |
| } finally { |
| StrictMode.setThreadPolicy(oldPolicy); |
| } |
| } |
| |
| if (sProviderInstance == null) { |
| if (DEBUG) Log.v(LOGTAG, "Falling back to default provider: " |
| + DEFAULT_WEBVIEW_FACTORY); |
| sProviderInstance = getFactoryByName(DEFAULT_WEBVIEW_FACTORY, |
| WebViewFactory.class.getClassLoader()); |
| if (sProviderInstance == null) { |
| if (DEBUG) Log.v(LOGTAG, "Falling back to explicit linkage"); |
| sProviderInstance = new WebViewClassic.Factory(); |
| } |
| } |
| return sProviderInstance; |
| } |
| } |
| |
| // TODO: This allows us to have the legacy and Chromium WebView coexist for development |
| // and side-by-side testing. After transition, remove this when no longer required. |
| private static WebViewFactoryProvider loadChromiumProvider() { |
| ClassLoader clazzLoader = new PathClassLoader(CHROMIUM_WEBVIEW_JAR, null, |
| WebViewFactory.class.getClassLoader()); |
| return getFactoryByName(CHROMIUM_WEBVIEW_FACTORY, clazzLoader); |
| } |
| |
| private static WebViewFactoryProvider getFactoryByName(String providerName, |
| ClassLoader loader) { |
| try { |
| if (DEBUG) Log.v(LOGTAG, "attempt to load class " + providerName); |
| Class<?> c = Class.forName(providerName, true, loader); |
| if (DEBUG) Log.v(LOGTAG, "instantiating factory"); |
| return (WebViewFactoryProvider) c.newInstance(); |
| } catch (ClassNotFoundException e) { |
| Log.e(LOGTAG, "error loading " + providerName, e); |
| } catch (IllegalAccessException e) { |
| Log.e(LOGTAG, "error loading " + providerName, e); |
| } catch (InstantiationException e) { |
| Log.e(LOGTAG, "error loading " + providerName, e); |
| } |
| return null; |
| } |
| } |