org.bimserver.plugins.classloaders.EclipsePluginClassloader.java Source code

Introduction

Here is the source code for org.bimserver.plugins.classloaders.EclipsePluginClassloader.java

Source

package org.bimserver.plugins.classloaders;

/******************************************************************************
 * Copyright (C) 2009-2016  BIMserver.org
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see {@literal<http://www.gnu.org/licenses/>}.
 *****************************************************************************/

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.io.IOUtils;
import org.bimserver.utils.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EclipsePluginClassloader extends PublicFindClassClassLoader {

    private static final Logger LOGGER = LoggerFactory.getLogger(EclipsePluginClassloader.class);
    private final Map<String, Class<?>> loadedClasses = new HashMap<String, Class<?>>();
    private final Path projectFolder;
    private final Path classFolder;

    public EclipsePluginClassloader(ClassLoader parentClassloader, Path projectFolder) {
        super(parentClassloader);
        this.projectFolder = projectFolder;
        this.classFolder = projectFolder.resolve("target/classes");
    }

    @Override
    public String toString() {
        return "EclipsePluginClassLoader: " + projectFolder.toString();
    }

    @Override
    public URL getResource(String name) {
        return findResource(name);
    }

    @Override
    public URL findResource(String name) {
        Path file = projectFolder.resolve(name);
        if (Files.exists(file)) {
            try {
                return file.toUri().toURL();
            } catch (MalformedURLException e) {
                LOGGER.error("", e);
            }
        }
        return null;
    }

    @Override
    public Class<?> findClass(String name) throws ClassNotFoundException {
        String filename = name.replace(".", File.separator) + ".class";
        if (loadedClasses.containsKey(filename)) {
            return loadedClasses.get(filename);
        }
        Path classFile = classFolder.resolve(filename);
        if (Files.exists(classFile)) {
            try {
                byte[] bytes = IOUtils.toByteArray(Files.newInputStream(classFile));
                Class<?> definedClass = defineClass(name, bytes, 0, bytes.length);
                if (definedClass != null) {
                    loadedClasses.put(filename, definedClass);

                    /*
                     * This is a fix to actually load the package-info.class file with
                     * the annotations about for example namespaces required for JAXB to
                     * work. Found this code here:
                     * https://issues.jboss.org/browse/JBPM-1404
                     */
                    if (definedClass != null) {
                        final int packageIndex = name.lastIndexOf('.');
                        if (packageIndex != -1) {
                            final String packageName = name.substring(0, packageIndex);
                            final Package classPackage = getPackage(packageName);
                            if (classPackage == null) {
                                definePackage(packageName, null, null, null, null, null, null, null);
                            }
                        }
                    }

                    return definedClass;
                }
            } catch (IOException e) {
                LOGGER.error("", e);
            }
        }
        throw new ClassNotFoundException(name);
    }

    public void dumpStructure(int indent) {
        System.out.print(StringUtils.gen("  ", indent));
        System.out.println("EclipsePluginClassloader " + projectFolder);
        ClassLoader parentLoader = getParent();
        if (parentLoader instanceof DelegatingClassLoader) {
            DelegatingClassLoader delegatingClassLoader = (DelegatingClassLoader) parentLoader;
            delegatingClassLoader.dumpStructure(indent + 1);
        }
    }
}