    001// Copyright 2008, 2010 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
    017/**
    018 * A cache for converting between class names and component (or other) classes. For component classes, ensures that the
    019 * class is the transformed class.
    020 */
    021public interface ComponentClassCache
    022{
    023    /**
    024     * Gets the Class instance for the given fully-qualified class name.
    025     *
    026     * @param className
    027     *            fully qualified class name, or a primitive type name, or an array name (in source format)
    028     * @return the class instance
    029     */
    030    Class forName(String className);
    031
    032    /**
    033     * Computes the default value for a field of the given type, returns the appropriate
    034     * default value. This is typically null, but may be false (for a primitive boolean) or some
    035     * version of 0 (for a primitive numeric field). Wrapper types will still be null.
    036     *
    037     * @param className
    038     *            type of field
    039     * @since 5.2.0
    040     */
    041    Object defaultValueForType(String className);
    042}