    001// Copyright 2024 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.corelib.pages;
    016
    017import java.util.ArrayList;
    018import java.util.Collections;
    019import java.util.Comparator;
    020import java.util.List;
    021
    022import org.apache.tapestry5.MarkupWriter;
    023import org.apache.tapestry5.annotations.UnknownActivationContextCheck;
    024import org.apache.tapestry5.annotations.WhitelistAccessOnly;
    025import org.apache.tapestry5.internal.plastic.PlasticClassLoader;
    026import org.apache.tapestry5.ioc.annotations.Inject;
    027import org.apache.tapestry5.services.pageload.PageClassLoaderContext;
    028import org.apache.tapestry5.services.pageload.PageClassLoaderContextManager;
    029
    030/**
    031 * Shows information about the page classloader contexts.
    032 */
    033@UnknownActivationContextCheck(false)
    034@WhitelistAccessOnly
    035public class PageClassLoaderContexts
    036{
    037
    038    @Inject
    039    private PageClassLoaderContextManager pageClassLoaderContextManager;
    040
    041    void onRender(MarkupWriter writer)
    042    {
    043        final PageClassLoaderContext root = pageClassLoaderContextManager.getRoot();
    044        render(root, writer);
    045    }
    046
    047    private void render(PageClassLoaderContext context, MarkupWriter writer)
    048    {
    049
    050        final int classes = context.getClassNames().size();
    051        writer.element("li");
    052        writer.element("details");
    053        writer.element("summary");
    054        writer.element("span", "class", "glyphicon glyphicon-zoom-in");
    055        writer.end(); // span
    056        writer.write(context.getName());
    057        writer.write(" (");
    058        writer.write(((PlasticClassLoader) context.getClassLoader()).getClassLoaderId());
    059        writer.write(", ");
    060        writer.write(String.valueOf(classes));
    061        if (classes > 1)
    062        {
    063            writer.write(" classes)");
    064        }
    065        else
    066        {
    067            writer.write(" class)");
    068        }
    069        writer.end(); // summary
    070
    071        if (!context.isRoot() && !context.getClassNames().isEmpty())
    072        {
    073            final List<String> classNames = new ArrayList<>(context.getClassNames());
    074            Collections.sort(classNames);
    075            writer.element("ul");
    076            for (String className : classNames)
    077            {
    078                writer.element("li").text(className);
    079                writer.end(); // li
    080            }
    081            writer.end(); // ul
    082        }
    083
    084        writer.end(); // details
    085
    086        final List<PageClassLoaderContext> children = new ArrayList<>(context.getChildren());
    087
    088        if (!children.isEmpty())
    089        {
    090            children.sort(Comparator.comparing(PageClassLoaderContext::getName));
    091            writer.element("ul");
    092            for (PageClassLoaderContext child : children)
    093            {
    094                writer.element("li");
    095                render(child, writer);
    096                writer.end(); // li
    097            }
    098            writer.end(); // ul
    099        }
    100
    101        writer.end(); //li
    102    }
    103
    104}