# TransientStateInstance.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.runtime.composite;

    import java.lang.reflect.AccessibleObject;
    import java.util.Map;
    import org.qi4j.api.property.Property;
    import org.qi4j.api.property.StateHolder;

    /**
     * TODO
     */
    public final class TransientStateInstance
        implements StateHolder
    {
        private final Map<AccessibleObject, Property<?>> properties;

        public TransientStateInstance( Map<AccessibleObject, Property<?>> properties
        )
        {
            this.properties = properties;
        }

        @Override
        @SuppressWarnings( "unchecked" )
        public <T> Property<T> propertyFor( AccessibleObject accessor )
            throws IllegalArgumentException
        {
            Property<T> property = (Property<T>) properties.get( accessor );

            if( property == null )
            {
                throw new IllegalArgumentException( "No such property:" + accessor );
            }

            return property;
        }

        @Override
        public Iterable<Property<?>> properties()
        {
            return properties.values();
        }
    }