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}