Created
May 13, 2015 09:05
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Small Preconditions helper class for your Offensive Programming
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import android.support.annotation.Nullable; | |
// Based on http://google-collections.googlecode.com/svn-history/r78/trunk/javadoc/com/google/common/base/Preconditions.html | |
public class Preconditions { | |
public static void checkArgument(boolean expression, @Nullable Object errorMessage) { | |
if (!expression) { | |
throw new IllegalArgumentException(String.valueOf(errorMessage)); | |
} | |
} | |
public static void checkState(boolean expression, @Nullable Object errorMessage) { | |
if (!expression) { | |
throw new IllegalStateException(String.valueOf(errorMessage)); | |
} | |
} | |
public static <T> T checkNotNull(T reference, @Nullable Object errorMessage) { | |
if (reference == null) { | |
throw new NullPointerException(String.valueOf(errorMessage)); | |
} | |
return reference; | |
} | |
public static <T> T checkNull(T reference, @Nullable Object errorMessage) { | |
checkState(reference == null, errorMessage); | |
return reference; | |
} | |
} |
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