# StateModel.java

    /*
     * Copyright (c) 2008-2011, 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.reflect.AccessibleObject;
    import org.qi4j.api.common.QualifiedName;
    import org.qi4j.api.composite.StateDescriptor;
    import org.qi4j.functional.HierarchicalVisitor;
    import org.qi4j.functional.VisitableHierarchy;
    import org.qi4j.runtime.property.PropertiesModel;
    import org.qi4j.runtime.property.PropertyModel;

    /**
     * Base model for Composite state
     */
    public class StateModel
        implements StateDescriptor, VisitableHierarchy<Object, Object>
    {
        protected final PropertiesModel propertiesModel;

        public StateModel( PropertiesModel propertiesModel )
        {
            this.propertiesModel = propertiesModel;
        }

        public PropertyModel propertyModelFor( AccessibleObject accessor )
        {
            return propertiesModel.getProperty( accessor );
        }

        @Override
        public PropertyModel findPropertyModelByName( String name )
            throws IllegalArgumentException
        {
            return propertiesModel.getPropertyByName( name );
        }

        @Override
        public PropertyModel findPropertyModelByQualifiedName( QualifiedName name )
            throws IllegalArgumentException
        {
            return propertiesModel.getPropertyByQualifiedName( name );
        }

        @Override
        public Iterable<PropertyModel> properties()
        {
            return propertiesModel.properties();
        }

        @Override
        public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor )
            throws ThrowableType
        {
            if( visitor.visitEnter( this ) )
            {
                ( (VisitableHierarchy<Object, Object>) propertiesModel ).accept( visitor );
            }
            return visitor.visitLeave( this );
        }
    }