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/*
* 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 org.mozilla.thirdparty.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;
}
}
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