Java Class Loader getProjectClassLoader(IJavaProject javaProject)

Description

Returns the Eclipse Project class loader using project build path

License

Open Source License

Parameter

Parameter	Description
javaProject	Eclipse Java Project

Exception

Parameter	Description
Exception	If the project is no valid

Return

A class loader using project build path

Declaration

public static ClassLoader getProjectClassLoader(IJavaProject javaProject) throws Exception 

Method Source Code

//package com.java2s;
/**/*from ww  w . j a v a 2s  . co  m*/
Copyright (C) 2010  E.Albert, P.Arenas, S.Genaim, G.Puebla, and D.Zanardini, G. Roman
            https://costa.ls.fi.upm.es
    
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
*/

import java.io.File;

import java.net.URL;
import java.net.URLClassLoader;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.internal.core.JavaModel;

public class Main {
    /**
     * Returns the Eclipse Project class loader using project build path
     * @param javaProject Eclipse Java Project
     * @return A class loader using project build path
     * @throws Exception If the project is no valid
     */
    public static ClassLoader getProjectClassLoader(IJavaProject javaProject) throws Exception {
        IClasspathEntry[] entries = javaProject.getResolvedClasspath(true);
        String wsPath = javaProject.getProject().getLocation().toPortableString();
        String firstEntryLocation = javaProject.getPath().toPortableString();
        int idx = wsPath.indexOf(firstEntryLocation);

        URL[] urls = null;
        int i = 0;

        //System.out.println("ClassLoader " + wsPath);
        //System.out.println("ClassLoader " + firstEntryLocation);

        String output = javaProject.getOutputLocation().toPortableString();
        urls = new URL[entries.length + 1];

        if (idx != -1) {
            wsPath = wsPath.substring(0, idx);
        } else {
            output = output.substring(firstEntryLocation.length());
        }
        urls[i++] = new File(wsPath + output).toURL();

        //System.out.println("ClassLoader " + output);

        String fullPath = null;

        for (IClasspathEntry entry : entries) {
            if (entry.getEntryKind() == IClasspathEntry.CPE_PROJECT) {
                IResource project = ResourcesPlugin.getWorkspace().getRoot().findMember(entry.getPath());
                String projectPath = JavaCore.create(project.getProject()).getOutputLocation().toPortableString();
                fullPath = wsPath + projectPath;
            } else {
                Object resource = JavaModel.getTarget(entry.getPath(), true);

                if (resource instanceof IResource) {
                    IResource iFile = (IResource) resource;
                    fullPath = iFile.getLocation().toPortableString();
                } else if (resource instanceof File) {
                    File file = (File) resource;
                    fullPath = file.getAbsolutePath();
                }
            }

            urls[i++] = new File(fullPath).toURL();
            //System.out.println(fullPath);
        }

        URLClassLoader classLoader = new URLClassLoader(urls, String.class.getClassLoader());

        /*for (int j = 0; j < urls.length; j ++) {
           System.out.println(urls[j]);
        }*/

        return classLoader;
    }
}

Related

1. getJvmExtClassLoader()
2. getLoadingDir(Class clazz)
3. getManifest(ClassLoader cl, String extension)
4. getPackageFolder(String packageName, ClassLoader classLoader)
5. getParentClassLoader()
6. getProjectClassLoader(IJavaProject javaProject, ClassLoader parentClassLoader)
7. getStreamForPath(ClassLoader loader, String path)
8. getToolsClassLoader()
9. isBizServicesLocatorXmlLoaded(File f, ClassLoader classLoader)