    001    // Copyright 2009 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.services;
    016
    017    import org.apache.tapestry5.ioc.annotations.UsesOrderedConfiguration;
    018
    019    /**
    020     * Used by {@link org.apache.tapestry5.corelib.components.ExceptionDisplay} to characterize each stack frame that is
    021     * presented.  Implemented as a chain-of-command service.
    022     *
    023     * @since 5.1.0.0
    024     */
    025    @UsesOrderedConfiguration(StackTraceElementAnalyzer.class)
    026    public interface StackTraceElementAnalyzer
    027    {
    028        /**
    029         * Returns the CSS class appropriate to the frame.
    030         *
    031         * @param frame stack trace element to be analyzed
    032         * @return the CSS class name, or null
    033         */
    034        String classForFrame(StackTraceElement frame);
    035    }