ArgumentUtil.java

/*
 * Copyright 2013 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 org.jboss.aerogear.io.netty.handler.codec.sockjs.util;

import java.util.Collection;

public final class ArgumentUtil {

    private ArgumentUtil() {
    }

    public static <T> void checkNotNull(final T ref, final String name) {
        if (ref == null) {
            throw new NullPointerException('[' + name + "] must not be null");
        }
    }

    public static <T> void checkNotNullAndNotEmpty(final T ref, final String name) {
        checkNotNull(ref, name);
        if ("".equals(ref)) {
            throw new IllegalArgumentException('[' + name + "] must not be empty");
        }
    }

    public static void checkNotNullAndNotEmpty(final Collection<?> c, final String name) {
        checkNotNull(c, name);
        if (c.isEmpty()) {
            throw new IllegalArgumentException("Collection[" + name + "] must not be empty");
        }
    }

    public static void checkNotEmpty(final Collection<?> c, final String name) {
        if (c.isEmpty()) {
            throw new IllegalArgumentException("Collection[" + name + "] must not be empty");
        }
    }

    public static void checkNotNegative(final long value, final String name) {
        if (value < 0) {
            throw new IllegalArgumentException('[' + name + "] must not be a negative number");
        }
    }

}