java source code of ServiceConnection

// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 org.chromium.customtabsclient.shared;

import android.content.ComponentName;
import android.support.customtabs.CustomTabsClient;
import android.support.customtabs.CustomTabsServiceConnection;

import java.lang.ref.WeakReference;

/**
 * Implementation for the CustomTabsServiceConnection that avoids leaking the
 * ServiceConnectionCallback
 */
public class ServiceConnection extends CustomTabsServiceConnection {
    // A weak reference to the ServiceConnectionCallback to avoid leaking it.
    private WeakReference<ServiceConnectionCallback> mConnectionCallback;

    public ServiceConnection(ServiceConnectionCallback connectionCallback) {
        mConnectionCallback = new WeakReference<>(connectionCallback);
    }

    @Override
    public void onCustomTabsServiceConnected(ComponentName name, CustomTabsClient client) {
        ServiceConnectionCallback connectionCallback = mConnectionCallback.get();
        if (connectionCallback != null) connectionCallback.onServiceConnected(client);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        ServiceConnectionCallback connectionCallback = mConnectionCallback.get();
        if (connectionCallback != null) connectionCallback.onServiceDisconnected();
    }
}