| /* |
| * Copyright (C) 2016 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 com.google.android.exoplayer2.util; |
| |
| import java.util.Arrays; |
| |
| /** Configurable loader for native libraries. */ |
| public final class LibraryLoader { |
| |
| private static final String TAG = "LibraryLoader"; |
| |
| private String[] nativeLibraries; |
| private boolean loadAttempted; |
| private boolean isAvailable; |
| |
| /** @param libraries The names of the libraries to load. */ |
| public LibraryLoader(String... libraries) { |
| nativeLibraries = libraries; |
| } |
| |
| /** |
| * Overrides the names of the libraries to load. Must be called before any call to {@link |
| * #isAvailable()}. |
| */ |
| public synchronized void setLibraries(String... libraries) { |
| Assertions.checkState(!loadAttempted, "Cannot set libraries after loading"); |
| nativeLibraries = libraries; |
| } |
| |
| /** Returns whether the underlying libraries are available, loading them if necessary. */ |
| public synchronized boolean isAvailable() { |
| if (loadAttempted) { |
| return isAvailable; |
| } |
| loadAttempted = true; |
| try { |
| for (String lib : nativeLibraries) { |
| System.loadLibrary(lib); |
| } |
| isAvailable = true; |
| } catch (UnsatisfiedLinkError exception) { |
| // Log a warning as an attempt to check for the library indicates that the app depends on an |
| // extension and generally would expect its native libraries to be available. |
| Log.w(TAG, "Failed to load " + Arrays.toString(nativeLibraries)); |
| } |
| return isAvailable; |
| } |
| } |