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/*
* 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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