# NullArgumentException.java

    /*  Copyright 2007 Niclas Hedhman.
     *
     * 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 org.qi4j.api.util;

    /**
     * Thrown if an argument to a method was null, and the method required
     * it to be non-null.
     */
    public class NullArgumentException
        extends IllegalArgumentException
    {
        private static final long serialVersionUID = 4815431779868729780L;

        private NullArgumentException( String message )
        {
            super( message );
        }

        public static void validateNotNull( String parameterName, Object value )
        {
            if( value != null )
            {
                return;
            }
            String message = parameterName + " was null.";
            throw new NullArgumentException( message );
        }

        public static void validateNotEmpty( String parameterName, String value )
        {
            if( value == null )
            {
                String message = parameterName + " was null.";
                throw new NullArgumentException( message );
            }
            if( value.length() == 0 )
            {
                String message = parameterName + " was empty.";
                throw new NullArgumentException( message );
            }
        }
    }