# MethodConcernsDetailDescriptor.java

    /*
     * Copyright (c) 2008, Edward Yakop. 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.tools.model.descriptor;

    import java.util.LinkedList;
    import java.util.List;
    import org.qi4j.api.concern.ConcernsDescriptor;

    import static org.qi4j.api.util.NullArgumentException.validateNotNull;

    public final class MethodConcernsDetailDescriptor
    {
        private final ConcernsDescriptor descriptor;
        private CompositeMethodDetailDescriptor method;
        private final List<MethodConcernDetailDescriptor> concerns;

        MethodConcernsDetailDescriptor( ConcernsDescriptor aDescriptor )
            throws IllegalArgumentException
        {
            validateNotNull( "aDescriptor", aDescriptor );
            descriptor = aDescriptor;
            concerns = new LinkedList<MethodConcernDetailDescriptor>();
        }

        /**
         * @return Descriptor of this {@code MethodConcernsDescriptor}.
         *
         * @since 0.5
         */
        public final ConcernsDescriptor descriptor()
        {
            return descriptor;
        }

        /**
         * @return Method that owns this {@code MethodConcernsDescriptor}.
         *
         * @since 0.5
         */
        public final CompositeMethodDetailDescriptor method()
        {
            return method;
        }

        /**
         * @return concerns of this {@code MethodConcernDetailDescriptor}.
         *
         * @since 0.5
         */
        public final Iterable<MethodConcernDetailDescriptor> concerns()
        {
            return concerns;
        }

        final void setMethod( CompositeMethodDetailDescriptor aDescriptor )
            throws IllegalArgumentException
        {
            validateNotNull( "aDescriptor", aDescriptor );
            method = aDescriptor;
        }

        final void addConcern( MethodConcernDetailDescriptor aDescriptor )
            throws IllegalArgumentException
        {
            validateNotNull( "aDescriptor", aDescriptor );
            aDescriptor.setConcerns( this );
            concerns.add( aDescriptor );
        }
    }