    001    // Copyright 2011 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5.plastic;
    016
    017    /**
    018     * The end result of a class transformation is a ClassInstantiator that can be used to
    019     * instantiate an instance of the transformed class.
    020     */
    021    public interface ClassInstantiator<T>
    022    {
    023        /**
    024         * Creates and returns a new instance of the transformed class.
    025         */
    026        T newInstance();
    027
    028        /**
    029         * Returns a <em>new</em> instantiator that adds the indicated value to the
    030         * instance's {@link InstanceContext}.
    031         *
    032         * @param valueType
    033         *            defines the type of value, and acts as a key to retrieve the value
    034         * @param instanceContextValue
    035         *            the non-null value stored
    036         * @throws AssertionError
    037         *             if instanceContextValue is null
    038         * @throws IllegalStateException
    039         *             if a value of the given value type has already been stored
    040         */
    041        <V> ClassInstantiator<T> with(Class<V> valueType, V instanceContextValue);
    042    }