ObjectUtil.java — netty Source File

Source Code

/*
 * 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:
 *
 * https://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;
import java.util.Map;

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

    private static final float FLOAT_ZERO = 0.0F;
    private static final double DOUBLE_ZERO = 0.0D;
    private static final long LONG_ZERO = 0L;
    private static final int INT_ZERO = 0;
    private static final short SHORT_ZERO = 0;

    private ObjectUtil() {
    }

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

    /**
     * Check that the given varargs is not null and does not contain elements
     * null elements.
     *
     * If it is, throws {@link NullPointerException}.
     * Otherwise, returns the argument.
     */
    public static <T> T[] deepCheckNotNull(String text, T... varargs) {
        if (varargs == null) {
            throw new NullPointerException(text);
        }

        for (T element : varargs) {
            if (element == null) {
                throw new NullPointerException(text);
            }
// ... (291 more lines)