    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
    015    package 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     */
    021    public 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    }