| /* |
| * 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.StrictMode; |
| import android.util.AndroidRuntimeException; |
| import android.util.Log; |
| |
| /** |
| * Top level factory, used creating all the main WebView implementation classes. |
| * |
| * @hide |
| */ |
| public final class WebViewFactory { |
| |
| private static final String CHROMIUM_WEBVIEW_FACTORY = |
| "com.android.webview.chromium.WebViewChromiumFactoryProvider"; |
| |
| private static final String NULL_WEBVIEW_FACTORY = |
| "com.android.webview.nullwebview.NullWebViewFactoryProvider"; |
| |
| 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 WebView internals when binding the proxy. |
| if (sProviderInstance != null) return sProviderInstance; |
| |
| Class<WebViewFactoryProvider> providerClass; |
| try { |
| providerClass = getFactoryClass(); |
| } catch (ClassNotFoundException e) { |
| Log.e(LOGTAG, "error loading provider", e); |
| throw new AndroidRuntimeException(e); |
| } |
| |
| StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); |
| try { |
| sProviderInstance = providerClass.newInstance(); |
| if (DEBUG) Log.v(LOGTAG, "Loaded provider: " + sProviderInstance); |
| return sProviderInstance; |
| } catch (Exception e) { |
| Log.e(LOGTAG, "error instantiating provider", e); |
| throw new AndroidRuntimeException(e); |
| } finally { |
| StrictMode.setThreadPolicy(oldPolicy); |
| } |
| } |
| } |
| |
| private static Class<WebViewFactoryProvider> getFactoryClass() throws ClassNotFoundException { |
| try { |
| return (Class<WebViewFactoryProvider>) Class.forName(CHROMIUM_WEBVIEW_FACTORY); |
| } catch (ClassNotFoundException e) { |
| Log.e(LOGTAG, "Chromium WebView does not exist"); |
| return (Class<WebViewFactoryProvider>) Class.forName(NULL_WEBVIEW_FACTORY); |
| } |
| } |
| } |