    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
    015package org.apache.tapestry5.services;
    016
    017import 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)
    026public 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}