Preconditions.java
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package com.danikula.videocache;
public final class Preconditions {
public static <T> T checkNotNull(T reference) {
if (reference == null) {
throw new NullPointerException();
}
return reference;
}
public static void checkAllNotNull(Object... references) {
for (Object reference : references) {
if (reference == null) {
throw new NullPointerException();
}
}
}
public static <T> T checkNotNull(T reference, String errorMessage) {
if (reference == null) {
throw new NullPointerException(errorMessage);
}
return reference;
}
static void checkArgument(boolean expression) {
if (!expression) {
throw new IllegalArgumentException();
}
}
static void checkArgument(boolean expression, String errorMessage) {
if (!expression) {
throw new IllegalArgumentException(errorMessage);
}
}
}