# ConstraintModel.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.common.ConstructionException;
    import org.qi4j.api.constraint.Constraint;

    /**
     * JAVADOC
     */
    public final class ConstraintModel
        extends AbstractConstraintModel
    {
        private final Class<? extends Constraint<?, ?>> constraintClass;

        public ConstraintModel( Annotation annotation, Class<? extends Constraint<?, ?>> constraintClass )
        {
            super( annotation );
            this.constraintClass = constraintClass;
        }

        @Override
        @SuppressWarnings( "unchecked" )
        public ConstraintInstance<?, ?> newInstance()
        {
            try
            {
                Constraint<?, ?> constraint = constraintClass.newInstance();
                return new ConstraintInstance( constraint, annotation );
            }
            catch( Exception e )
            {
                throw new ConstructionException( "Could not instantiate constraint implementation", e );
            }
        }
    }