    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
    015package 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 */
    021public 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}