Reland "Android: Remove GetApplicationContext part 2"

android_webview/java/src/org/chromium/android_webview/AndroidProtocolHandler.java

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.android_webview;
 
-import android.content.Context;
 import android.content.res.AssetManager;
 import android.net.Uri;
 import android.util.Log;
 import android.util.TypedValue;
 
+import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URLConnection;
 import java.util.List;
 
 /**
  * Implements the Java side of Android URL protocol jobs.
  * See android_protocol_handler.cc.
  */
 @JNINamespace("android_webview")
 public class AndroidProtocolHandler {
     private static final String TAG = "AndroidProtocolHandler";
 
     // Supported URL schemes. This needs to be kept in sync with
     // clank/native/framework/chrome/url_request_android_job.cc.
     private static final String FILE_SCHEME = "file";
     private static final String CONTENT_SCHEME = "content";
 
     /**
      * Open an InputStream for an Android resource.
-     * @param context The context manager.
+     *
      * @param url The url to load.
      * @return An InputStream to the Android resource.
      */
     @CalledByNative
-    public static InputStream open(Context context, String url) {
+    public static InputStream open(String url) {
         Uri uri = verifyUrl(url);
         if (uri == null) {
             return null;
         }
         try {
             String path = uri.getPath();
             if (uri.getScheme().equals(FILE_SCHEME)) {
                 if (path.startsWith(nativeGetAndroidAssetPath())) {
-                    return openAsset(context, uri);
+                    return openAsset(uri);
                 } else if (path.startsWith(nativeGetAndroidResourcePath())) {
-                    return openResource(context, uri);
+                    return openResource(uri);
                 }
             } else if (uri.getScheme().equals(CONTENT_SCHEME)) {
-                return openContent(context, uri);
+                return openContent(uri);
             }
         } catch (Exception ex) {
             Log.e(TAG, "Error opening inputstream: " + url);
         }
         return null;
     }
 
     // Assumes input string is in the format "foo.bar.baz" and strips out the last component.
     // Returns null on failure.
     private static String removeOneSuffix(String input) {
         if (input == null) return null;
         int lastDotIndex = input.lastIndexOf('.');
         if (lastDotIndex == -1) return null;
         return input.substring(0, lastDotIndex);
     }
 
-    private static Class<?> getClazz(Context context, String packageName, String assetType)
-            throws ClassNotFoundException {
-        return context.getClassLoader().loadClass(packageName + ".R$" + assetType);
+    private static Class<?> getClazz(String assetType) throws ClassNotFoundException {
+        return ContextUtils.getApplicationContext().getClassLoader().loadClass(
+                ContextUtils.getApplicationContext().getPackageName() + ".R$" + assetType);
     }
 
-    private static int getFieldId(Context context, String assetType, String assetName)
-        throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
+    private static int getFieldId(String assetType, String assetName)
+            throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
         Class<?> clazz = null;
         try {
-            clazz = getClazz(context, context.getPackageName(), assetType);
+            clazz = getClazz(assetType);
         } catch (ClassNotFoundException e) {
             // Strip out components from the end so gradle generated application suffix such as
             // com.example.my.pkg.pro works. This is by no means bulletproof.
-            String packageName = context.getPackageName();
+            String packageName = ContextUtils.getApplicationContext().getPackageName();
             while (clazz == null) {
                 packageName = removeOneSuffix(packageName);
                 // Throw original exception which contains the entire package id.
                 if (packageName == null) throw e;
                 try {
-                    clazz = getClazz(context, packageName, assetType);
+                    clazz = getClazz(assetType);
                 } catch (ClassNotFoundException ignored) {
                     // Strip and try again.
                 }
             }
         }
 
         java.lang.reflect.Field field = clazz.getField(assetName);
         int id = field.getInt(null);
         return id;
     }
 
-    private static int getValueType(Context context, int fieldId) {
+    private static int getValueType(int fieldId) {
         TypedValue value = new TypedValue();
-        context.getResources().getValue(fieldId, value, true);
+        ContextUtils.getApplicationContext().getResources().getValue(fieldId, value, true);
         return value.type;
     }
 
-    private static InputStream openResource(Context context, Uri uri) {
+    private static InputStream openResource(Uri uri) {
         assert uri.getScheme().equals(FILE_SCHEME);
         assert uri.getPath() != null;
         assert uri.getPath().startsWith(nativeGetAndroidResourcePath());
         // The path must be of the form "/android_res/asset_type/asset_name.ext".
         List<String> pathSegments = uri.getPathSegments();
         if (pathSegments.size() != 3) {
             Log.e(TAG, "Incorrect resource path: " + uri);
             return null;
         }
         String assetPath = pathSegments.get(0);
         String assetType = pathSegments.get(1);
         String assetName = pathSegments.get(2);
         if (!("/" + assetPath + "/").equals(nativeGetAndroidResourcePath())) {
             Log.e(TAG, "Resource path does not start with " + nativeGetAndroidResourcePath()
                     + ": " + uri);
             return null;
         }
         // Drop the file extension.
         assetName = assetName.split("\\.")[0];
         try {
-            // Use the application context for resolving the resource package name so that we do
-            // not use the browser's own resources. Note that if 'context' here belongs to the
-            // test suite, it does not have a separate application context. In that case we use
-            // the original context object directly.
-            if (context.getApplicationContext() != null) {
-                context = context.getApplicationContext();
-            }
-            int fieldId = getFieldId(context, assetType, assetName);
-            int valueType = getValueType(context, fieldId);
+            int fieldId = getFieldId(assetType, assetName);
+            int valueType = getValueType(fieldId);
             if (valueType == TypedValue.TYPE_STRING) {
-                return context.getResources().openRawResource(fieldId);
+                return ContextUtils.getApplicationContext().getResources().openRawResource(fieldId);
             } else {
                 Log.e(TAG, "Asset not of type string: " + uri);
                 return null;
             }
         } catch (ClassNotFoundException e) {
             Log.e(TAG, "Unable to open resource URL: " + uri, e);
             return null;
         } catch (NoSuchFieldException e) {
             Log.e(TAG, "Unable to open resource URL: " + uri, e);
             return null;
         } catch (IllegalAccessException e) {
             Log.e(TAG, "Unable to open resource URL: " + uri, e);
             return null;
         }
     }
 
-    private static InputStream openAsset(Context context, Uri uri) {
+    private static InputStream openAsset(Uri uri) {
         assert uri.getScheme().equals(FILE_SCHEME);
         assert uri.getPath() != null;
         assert uri.getPath().startsWith(nativeGetAndroidAssetPath());
         String path = uri.getPath().replaceFirst(nativeGetAndroidAssetPath(), "");
         try {
-            AssetManager assets = context.getAssets();
+            AssetManager assets = ContextUtils.getApplicationContext().getAssets();
             return assets.open(path, AssetManager.ACCESS_STREAMING);
         } catch (IOException e) {
             Log.e(TAG, "Unable to open asset URL: " + uri);
             return null;
         }
     }
 
-    private static InputStream openContent(Context context, Uri uri) {
+    private static InputStream openContent(Uri uri) {
         assert uri.getScheme().equals(CONTENT_SCHEME);
         try {
-            return context.getContentResolver().openInputStream(uri);
+            return ContextUtils.getApplicationContext().getContentResolver().openInputStream(uri);
         } catch (Exception e) {
             Log.e(TAG, "Unable to open content URL: " + uri);
             return null;
         }
     }
 
     /**
      * Determine the mime type for an Android resource.
-     * @param context The context manager.
-     * @param stream The opened input stream which to examine.
-     * @param url The url from which the stream was opened.
+     *
+     * @param stream  The opened input stream which to examine.
+     * @param url     The url from which the stream was opened.
      * @return The mime type or null if the type is unknown.
      */
     @CalledByNative
-    public static String getMimeType(Context context, InputStream stream, String url) {
+    public static String getMimeType(InputStream stream, String url) {
         Uri uri = verifyUrl(url);
         if (uri == null) {
             return null;
         }
         try {
             String path = uri.getPath();
             // The content URL type can be queried directly.
             if (uri.getScheme().equals(CONTENT_SCHEME)) {
-                return context.getContentResolver().getType(uri);
+                return ContextUtils.getApplicationContext().getContentResolver().getType(uri);
                 // Asset files may have a known extension.
             } else if (uri.getScheme().equals(FILE_SCHEME)
-                       && path.startsWith(nativeGetAndroidAssetPath())) {
+                    && path.startsWith(nativeGetAndroidAssetPath())) {
                 String mimeType = URLConnection.guessContentTypeFromName(path);
                 if (mimeType != null) {
                     return mimeType;
                 }
             }
         } catch (Exception ex) {
             Log.e(TAG, "Unable to get mime type" + url);
             return null;
         }
         // Fall back to sniffing the type from the stream.
         try {
             return URLConnection.guessContentTypeFromStream(stream);
         } catch (IOException e) {
             return null;
         }
     }
 
     /**
      * Make sure the given string URL is correctly formed and parse it into a Uri.
+     *
      * @return a Uri instance, or null if the URL was invalid.
      */
     private static Uri verifyUrl(String url) {
         if (url == null) {
             return null;
         }
         Uri uri = Uri.parse(url);
         if (uri == null) {
             Log.e(TAG, "Malformed URL: " + url);
             return null;
         }
         String path = uri.getPath();
         if (path == null || path.length() == 0) {
             Log.e(TAG, "URL does not have a path: " + url);
             return null;
         }
         return uri;
     }
 
-    /**
-     * Set the context to be used for resolving resource queries.
-     * @param context Context to be used, or null for the default application
-     *                context.
-     */
-    public static void setResourceContextForTesting(Context context) {
-        nativeSetResourceContextForTesting(context);
-    }
+    private static native String nativeGetAndroidAssetPath();
 
-    private static native void nativeSetResourceContextForTesting(Context context);
-    private static native String nativeGetAndroidAssetPath();
     private static native String nativeGetAndroidResourcePath();
 }