# AbstractConstraintModel.java

    /*
     * Copyright (c) 2008, Rickard Öberg. All Rights Reserved.
     *
     * 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.runtime.composite;

    import java.lang.annotation.Annotation;
    import org.qi4j.api.constraint.ConstraintDescriptor;
    import org.qi4j.functional.Visitable;
    import org.qi4j.functional.Visitor;

    /**
     * JAVADOC
     */
    public abstract class AbstractConstraintModel
        implements ConstraintDescriptor, Visitable<ConstraintDescriptor>
    {
        protected final Annotation annotation;

        public AbstractConstraintModel( Annotation annotation )
        {
            this.annotation = annotation;
        }

        @Override
        public Annotation annotation()
        {
            return annotation;
        }

        public abstract ConstraintInstance<?, ?> newInstance();

        @Override
        public <ThrowableType extends Throwable> boolean accept( Visitor<? super ConstraintDescriptor, ThrowableType> modelVisitor )
            throws ThrowableType
        {
            return modelVisitor.visit( this );
        }
    }