001// Copyright 2006, 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.internal.services;
016
017import org.apache.tapestry5.ComponentResources;
018import org.apache.tapestry5.internal.InternalComponentResources;
019import org.apache.tapestry5.model.ComponentModel;
020import org.apache.tapestry5.plastic.ClassInstantiator;
021import org.apache.tapestry5.plastic.InstanceContext;
022import org.apache.tapestry5.runtime.Component;
023
024/**
025 * An object that can instantiate a component. This is now largely a wrapper around {@link ClassInstantiator}.
026 */
027public interface Instantiator
028{
029    /**
030     * Instantiates and returns a new instance of the desired class. Component classes are always modified so that they
031     * implement {@link Component} (and often, other interfaces as well). The resources are made available
032     * in the {@link InstanceContext} as both {@link ComponentResources} and {@link InternalComponentResources}.
033     */
034    Component newInstance(InternalComponentResources resources);
035
036    /**
037     * Returns the model that defines the behavior of the component.
038     */
039    ComponentModel getModel();
040}