--- /dev/null
+/*
+ * Copyright (C) 2009 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.Handler;
+import android.os.Message;
+import android.util.Log;
+import java.util.concurrent.locks.Condition;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.Set;
+
+
+/**
+ * Implements the Java side of GeolocationPermissions. Simply marshalls calls
+ * from the UI thread to the WebKit thread.
+ * @hide
+ */
+public final class GeolocationPermissions {
+ // Log tag
+ private static final String TAG = "geolocationPermissions";
+
+ // Global instance
+ private static GeolocationPermissions sInstance;
+
+ private Handler mHandler;
+
+ // Members used to transfer the origins and permissions between threads.
+ private Set<String> mOrigins;
+ private boolean mAllowed;
+ private static Lock mLock = new ReentrantLock();
+ private static boolean mUpdated;
+ private static Condition mUpdatedCondition = mLock.newCondition();
+
+ // Message ids
+ static final int GET_ORIGINS = 0;
+ static final int GET_ALLOWED = 1;
+ static final int CLEAR = 2;
+ static final int CLEAR_ALL = 3;
+
+ /**
+ * Gets the singleton instance of the class.
+ */
+ public static GeolocationPermissions getInstance() {
+ if (sInstance == null) {
+ sInstance = new GeolocationPermissions();
+ }
+ return sInstance;
+ }
+
+ /**
+ * Creates the message handler. Must be called on the WebKit thread.
+ */
+ public void createHandler() {
+ if (mHandler == null) {
+ mHandler = new Handler() {
+ @Override
+ public void handleMessage(Message msg) {
+ // Runs on the WebKit thread.
+ switch (msg.what) {
+ case GET_ORIGINS:
+ getOriginsImpl();
+ break;
+ case GET_ALLOWED:
+ getAllowedImpl((String) msg.obj);
+ break;
+ case CLEAR:
+ nativeClear((String) msg.obj);
+ break;
+ case CLEAR_ALL:
+ nativeClearAll();
+ break;
+ }
+ }
+ };
+ }
+ }
+
+ /**
+ * Utility function to send a message to our handler.
+ */
+ private void postMessage(Message msg) {
+ assert(mHandler != null);
+ mHandler.sendMessage(msg);
+ }
+
+ /**
+ * Gets the set of origins for which Geolocation permissions are stored.
+ * Note that we represent the origins as strings. These are created using
+ * WebCore::SecurityOrigin::toString(). As long as all 'HTML 5 modules'
+ * (Database, Geolocation etc) do so, it's safe to match up origins for the
+ * purposes of displaying UI.
+ */
+ public Set getOrigins() {
+ // Called on the UI thread.
+ Set origins = null;
+ mLock.lock();
+ try {
+ mUpdated = false;
+ postMessage(Message.obtain(null, GET_ORIGINS));
+ while (!mUpdated) {
+ mUpdatedCondition.await();
+ }
+ origins = mOrigins;
+ } catch (InterruptedException e) {
+ Log.e(TAG, "Exception while waiting for update", e);
+ } finally {
+ mLock.unlock();
+ }
+ return origins;
+ }
+
+ /**
+ * Helper method to get the set of origins.
+ */
+ private void getOriginsImpl() {
+ // Called on the WebKit thread.
+ mLock.lock();
+ mOrigins = nativeGetOrigins();
+ mUpdated = true;
+ mUpdatedCondition.signal();
+ mLock.unlock();
+ }
+
+ /**
+ * Gets the permission state for the specified origin.
+ */
+ public boolean getAllowed(String origin) {
+ // Called on the UI thread.
+ boolean allowed = false;
+ mLock.lock();
+ try {
+ mUpdated = false;
+ postMessage(Message.obtain(null, GET_ALLOWED, origin));
+ while (!mUpdated) {
+ mUpdatedCondition.await();
+ }
+ allowed = mAllowed;
+ } catch (InterruptedException e) {
+ Log.e(TAG, "Exception while waiting for update", e);
+ } finally {
+ mLock.unlock();
+ }
+ return allowed;
+ }
+
+ /**
+ * Helper method to get the permission state.
+ */
+ private void getAllowedImpl(String origin) {
+ // Called on the WebKit thread.
+ mLock.lock();
+ mAllowed = nativeGetAllowed(origin);
+ mUpdated = true;
+ mUpdatedCondition.signal();
+ mLock.unlock();
+ }
+
+ /**
+ * Clears the permission state for the specified origin.
+ */
+ public void clear(String origin) {
+ // Called on the UI thread.
+ postMessage(Message.obtain(null, CLEAR, origin));
+ }
+
+ /**
+ * Clears the permission state for all origins.
+ */
+ public void clearAll() {
+ // Called on the UI thread.
+ postMessage(Message.obtain(null, CLEAR_ALL));
+ }
+
+ // Native functions, run on the WebKit thread.
+ private static native Set nativeGetOrigins();
+ private static native boolean nativeGetAllowed(String origin);
+ private static native void nativeClear(String origin);
+ private static native void nativeClearAll();
+}
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