io.datakernel.common.Preconditions Maven / Gradle / Ivy

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/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * 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 io.datakernel.common;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;

public final class Preconditions {

	@NotNull
	public static  T checkNotNull(@Nullable T reference) {
		if (reference != null) {
			return reference;
		}
		throw new NullPointerException();
	}

	@NotNull
	public static  T checkNotNull(@Nullable T reference, Object message) {
		if (reference != null) {
			return reference;
		}
		throw new NullPointerException(String.valueOf(message));
	}

	@NotNull
	public static  T checkNotNull(@Nullable T reference, Supplier message) {
		if (reference != null) {
			return reference;
		}
		throw new NullPointerException(message.get());
	}

	@NotNull
	public static  T checkNotNull(@Nullable T reference, String template, Object... args) {
		if (reference != null) {
			return reference;
		}
		throw new NullPointerException(String.format(template, args));
	}

	public static void checkState(boolean expression) {
		if (!expression) {
			throw new IllegalStateException();
		}
	}

	public static void checkState(boolean expression, Object message) {
		if (!expression) {
			throw new IllegalStateException(String.valueOf(message));
		}
	}

	public static void checkState(boolean expression, Supplier message) {
		if (!expression) {
			throw new IllegalStateException(message.get());
		}
	}

	public static void checkState(boolean expression, String template, Object... args) {
		if (!expression) {
			throw new IllegalStateException(String.format(template, args));
		}
	}

	public static void checkArgument(boolean expression) {
		if (!expression) {
			throw new IllegalArgumentException();
		}
	}

	public static void checkArgument(boolean expression, Object message) {
		if (!expression) {
			throw new IllegalArgumentException(String.valueOf(message));
		}
	}

	public static void checkArgument(boolean expression, Supplier message) {
		if (!expression) {
			throw new IllegalArgumentException(message.get());
		}
	}

	public static void checkArgument(boolean expression, String template, Object... args) {
		if (!expression) {
			throw new IllegalArgumentException(String.format(template, args));
		}
	}

	public static  T checkArgument(T argument, Predicate predicate) {
		if (predicate.test(argument)) {
			return argument;
		}
		throw new IllegalArgumentException();
	}

	public static  T checkArgument(T argument, Predicate predicate, Object message) {
		if (predicate.test(argument)) {
			return argument;
		}
		throw new IllegalArgumentException(String.valueOf(message));
	}

	public static  T checkArgument(T argument, Predicate predicate, Supplier message) {
		if (predicate.test(argument)) {
			return argument;
		}
		throw new IllegalArgumentException(message.get());
	}

	public static  T checkArgument(T argument, Predicate predicate, Function message) {
		if (predicate.test(argument)) {
			return argument;
		}
		throw new IllegalArgumentException(message.apply(argument));
	}

	public static  T checkArgument(T argument, Predicate predicate, String template, Object... args) {
		if (predicate.test(argument)) {
			return argument;
		}
		throw new IllegalArgumentException(String.format(template, args));
	}

}