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Easier java reflections

There is a newer version: 5.1.0

package org.perfectable.introspection.proxy;

import java.util.concurrent.Callable;
import java.util.function.Supplier;

final class Invocations {
	static final class Returning implements Invocation {
		private final T result;

		Returning(T result) {
			this.result = result;
		}

		@Override
		public T invoke() {
			return result;
		}
	}

	static final class Throwing implements Invocation {
		private final Supplier thrownSupplier;

		Throwing(Supplier thrownSupplier) {
			this.thrownSupplier = thrownSupplier;
		}

		@Override
		public Void invoke() throws X {
			throw thrownSupplier.get();
		}
	}

	static final class CallableAdapter implements Invocation {
		private final Callable callable;

		CallableAdapter(Callable callable) {
			this.callable = callable;
		}

		@Override
		public R invoke() throws Exception {
			return callable.call();
		}
	}

	static final class RunnableAdapter implements Invocation {
		private final Runnable runnable;

		RunnableAdapter(Runnable runnable) {
			this.runnable = runnable;
		}

		@Override
		public Void invoke() {
			runnable.run();
			return null;
		}
	}

	static final class Casting implements Invocation {
		private final Invocation parent;
		private final Class targetCast;

		Casting(Invocation parent, Class targetCast) {
			this.parent = parent;
			this.targetCast = targetCast;
		}

		@Override
		public S invoke() throws X {
			@SuppressWarnings("assignment")
			R result = parent.invoke();
			return targetCast.cast(result);
		}
	}

	private Invocations() {
		// utility class
	}
}