org.bbottema.javareflection.util.MiscUtil Maven / Gradle / Ivy

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Java Reflection provides a small package with nifty reflection features that will help with finding constructors, methods and value conversions

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package org.bbottema.javareflection.util;

import lombok.experimental.UtilityClass;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static java.lang.String.format;
import static java.util.Objects.requireNonNull;

@UtilityClass
public final class MiscUtil {
	
	@SafeVarargs
	@SuppressWarnings("varargs")
	public static  List newArrayList(T... o) {
		ArrayList l = new ArrayList<>();
		Collections.addAll(l, o);
		return l;
	}
	
	@SuppressWarnings("unchecked")
	@NotNull
	public static  T trustedCast(@NotNull Object o) {
		return (T) o;
	}
	
	@SuppressWarnings("unchecked")
	@Nullable
	public static  T trustedNullableCast(@Nullable Object o) {
		return (T) o;
	}
	
	@SuppressWarnings("unchecked")
	public static  T requireNonNullOfType(Object o, Class type) {
		if (requireNonNull(o).getClass() != type) {
			throw new AssertionError(format("got type %s, expected type %s", o.getClass(), type));
		}
		return (T) o;
	}
}