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/**
* Copyright 2014 Netflix, Inc.
*
* 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 rx.internal.util;
/**
* Allow platform dependent logic such as checks for Android.
*
* Modeled after Netty with some code copy/pasted from: https://github.com/netty/netty/blob/master/common/src/main/java/io/netty/util/internal/PlatformDependent.java
*/
public final class PlatformDependent {
/**
* Possible value of {@link #getAndroidApiVersion()} which means that the current platform is not Android.
*/
public static final int ANDROID_API_VERSION_IS_NOT_ANDROID = 0;
private static final int ANDROID_API_VERSION = resolveAndroidApiVersion();
private static final boolean IS_ANDROID = ANDROID_API_VERSION != ANDROID_API_VERSION_IS_NOT_ANDROID;
/** Utility class. */
private PlatformDependent() {
throw new IllegalStateException("No instances!");
}
/**
* Returns {@code true} if and only if the current platform is Android.
* @return {@code true} if and only if the current platform is Android
*/
public static boolean isAndroid() {
return IS_ANDROID;
}
/**
* Returns version of Android API.
*
* @return version of Android API or {@link #ANDROID_API_VERSION_IS_NOT_ANDROID } if version
* can not be resolved or if current platform is not Android.
*/
public static int getAndroidApiVersion() {
return ANDROID_API_VERSION;
}
/**
* Resolves version of Android API.
*
* @return version of Android API or {@link #ANDROID_API_VERSION_IS_NOT_ANDROID} if version can not be resolved
* or if the current platform is not Android.
* @see Documentation
*/
private static int resolveAndroidApiVersion() {
try {
return (Integer) Class
.forName("android.os.Build$VERSION")
.getField("SDK_INT")
.get(null);
} catch (Exception e) { // NOPMD
// Can not resolve version of Android API, maybe current platform is not Android
// or API of resolving current Version of Android API has changed in some release of Android
return ANDROID_API_VERSION_IS_NOT_ANDROID;
}
}
}