    001// Copyright 2011 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
    017import org.apache.tapestry5.services.StackTraceElementAnalyzer;
    018
    019import java.util.regex.Pattern;
    020
    021/**
    022 * Uses a regular expression to identify which CSS class to apply to a frame. The frame's {@code toString()} is used. Uses
    023 * {@link java.util.regex.Matcher#find()} to search for a subsequence of the frame's description.
    024 *
    025 * @since 5.3
    026 */
    027public class RegexpStackTraceElementAnalyzer implements StackTraceElementAnalyzer
    028{
    029    private final Pattern pattern;
    030
    031    private final String cssClass;
    032
    033    public RegexpStackTraceElementAnalyzer(Pattern pattern, String cssClass)
    034    {
    035        this.pattern = pattern;
    036        this.cssClass = cssClass;
    037    }
    038
    039    public String classForFrame(StackTraceElement frame)
    040    {
    041        if (pattern.matcher(frame.toString()).find())
    042        {
    043            return cssClass;
    044        }
    045
    046        return null;
    047    }
    048}