# NotSpecification.java

    /*
     * Licensed to the Apache Software Foundation (ASF) under one
     * or more contributor license agreements.  See the NOTICE file
     * distributed with this work for additional information
     * regarding copyright ownership.  The ASF 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.qi4j.api.query.grammar;

    import org.qi4j.api.composite.Composite;
    import org.qi4j.functional.Specification;
    import org.qi4j.functional.Specifications;

    /**
     * NOT Specification.
     */
    public class NotSpecification implements Specification<Composite>
    {
        private Specification<Composite> operand;

        public NotSpecification( Specification<Composite> operand )
        {
            this.operand = operand;
        }

        public Specification<Composite> operand()
        {
            return operand;
        }

        @Override
        public boolean satisfiedBy( Composite item )
        {
            return Specifications.not( operand ).satisfiedBy( item );
        }

        @Override
        public String toString()
        {
            return "!" + operand.toString();
        }
    }