io.netty.util.internal.ObjectUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 35.0.0.Beta1

Show newest version

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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.netty.util.internal;

import java.util.Collection;

/**
 * A grab-bag of useful utility methods.
 */
public final class ObjectUtil {

    private ObjectUtil() {
    }

    /**
     * Checks that the given argument is not null. If it is, throws {@link NullPointerException}.
     * Otherwise, returns the argument.
     */
    public static  T checkNotNull(T arg, String text) {
        if (arg == null) {
            throw new NullPointerException(text);
        }
        return arg;
    }

    /**
     * Checks that the given argument is strictly positive. If it is not, throws {@link IllegalArgumentException}.
     * Otherwise, returns the argument.
     */
    public static int checkPositive(int i, String name) {
        if (i <= 0) {
            throw new IllegalArgumentException(name + ": " + i + " (expected: > 0)");
        }
        return i;
    }

    /**
     * Checks that the given argument is strictly positive. If it is not, throws {@link IllegalArgumentException}.
     * Otherwise, returns the argument.
     */
    public static long checkPositive(long i, String name) {
        if (i <= 0) {
            throw new IllegalArgumentException(name + ": " + i + " (expected: > 0)");
        }
        return i;
    }

    /**
     * Checks that the given argument is positive or zero. If it is not , throws {@link IllegalArgumentException}.
     * Otherwise, returns the argument.
     */
    public static int checkPositiveOrZero(int i, String name) {
        if (i < 0) {
            throw new IllegalArgumentException(name + ": " + i + " (expected: >= 0)");
        }
        return i;
    }

    /**
     * Checks that the given argument is positive or zero. If it is not, throws {@link IllegalArgumentException}.
     * Otherwise, returns the argument.
     */
    public static long checkPositiveOrZero(long i, String name) {
        if (i < 0) {
            throw new IllegalArgumentException(name + ": " + i + " (expected: >= 0)");
        }
        return i;
    }

    /**
     * Checks that the given argument is neither null nor empty.
     * If it is, throws {@link NullPointerException} or {@link IllegalArgumentException}.
     * Otherwise, returns the argument.
     */
    public static  T[] checkNonEmpty(T[] array, String name) {
        checkNotNull(array, name);
        checkPositive(array.length, name + ".length");
        return array;
    }

    /**
     * Checks that the given argument is neither null nor empty.
     * If it is, throws {@link NullPointerException} or {@link IllegalArgumentException}.
     * Otherwise, returns the argument.
     */
    public static > T checkNonEmpty(T collection, String name) {
        checkNotNull(collection, name);
        checkPositive(collection.size(), name + ".size");
        return collection;
    }

    /**
     * Resolves a possibly null Integer to a primitive int, using a default value.
     * @param wrapper the wrapper
     * @param defaultValue the default value
     * @return the primitive value
     */
    public static int intValue(Integer wrapper, int defaultValue) {
        return wrapper != null ? wrapper : defaultValue;
    }

    /**
     * Resolves a possibly null Long to a primitive long, using a default value.
     * @param wrapper the wrapper
     * @param defaultValue the default value
     * @return the primitive value
     */
    public static long longValue(Long wrapper, long defaultValue) {
        return wrapper != null ? wrapper : defaultValue;
    }
}