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}