Java tutorial
/******************************************************************************* * Copyright (c) 2006, 2010 Soyatec (http://www.soyatec.com) and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Soyatec - initial API and implementation *******************************************************************************/ package org.eclipse.e4.xwt.ui.utils; import java.io.File; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.IPath; import org.eclipse.jdt.core.IClasspathEntry; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jdt.core.IPackageFragmentRoot; import org.eclipse.jdt.core.IType; import org.eclipse.jdt.core.JavaCore; import org.eclipse.jdt.core.JavaModelException; public class ClassLoaderHelper { public static URL getResourceAsURL(IJavaProject javaProject, String name) { if (javaProject == null) return null; Set<IJavaProject> visited = new HashSet<IJavaProject>(); URL url = findResourceURL(javaProject, visited, true, name); if (url == null) { IFile file = javaProject.getProject().getFile(name); if (file.exists()) { url = toURL(file.getLocation()); } } return url; } public static byte[] getClassContent(IJavaProject javaProject, String className) { if (javaProject == null || !javaProject.exists()) return null; String resourceName = className.replace('.', '/') + ".class"; try { IPath outPath = javaProject.getProject().getLocation().removeLastSegments(1) .append(javaProject.getOutputLocation()); outPath = outPath.addTrailingSeparator(); { URL url = toURL(outPath.append(resourceName)); if (url != null) { InputStream inputStream = url.openStream(); byte[] content = new byte[inputStream.available()]; inputStream.read(content); return content; } for (IProject project : javaProject.getProject().getReferencedProjects()) { if (!project.isOpen()) { continue; } IJavaProject javaReferencedProject = JavaCore.create(project); if (javaReferencedProject.exists()) { byte[] content = getClassContent(javaReferencedProject, className); if (content != null) { return content; } } } } IType type = javaProject.findType(className); if (type != null && type.exists()) { if (type.isBinary()) { return type.getClassFile().getBytes(); } else { IJavaProject typeProject = type.getJavaProject(); if (!javaProject.equals(typeProject)) { return getClassContent(typeProject, className); } } } } catch (Exception e) { e.printStackTrace(); } return null; } public static URL[] getClasspathAsURLArray(IJavaProject javaProject) { if (javaProject == null) return null; Set<IJavaProject> visited = new HashSet<IJavaProject>(); List<URL> urls = new ArrayList<URL>(20); collectClasspathURLs(javaProject, urls, visited, true); URL[] result = new URL[urls.size()]; urls.toArray(result); return result; } private static URL findResourceURL(IJavaProject javaProject, Set<IJavaProject> visited, boolean isFirstProject, String name) { if (visited.contains(javaProject)) return null; visited.add(javaProject); try { IPath outPath = javaProject.getProject().getLocation().removeLastSegments(1) .append(javaProject.getOutputLocation()); outPath = outPath.addTrailingSeparator(); { URL url = toURL(outPath.append(name)); if (url != null) { return url; } } for (IPackageFragmentRoot fragment : javaProject.getPackageFragmentRoots()) { if (fragment.getKind() == IPackageFragmentRoot.K_SOURCE) { URL url = toURL(fragment.getResource().getLocation().append(name)); if (url != null) { return url; } } } // urls.add(out); IClasspathEntry[] entries = javaProject.getResolvedClasspath(true); for (IClasspathEntry entry : entries) { switch (entry.getEntryKind()) { case IClasspathEntry.CPE_LIBRARY: { // TODO IClasspathEntry resolveEntry = JavaCore.getResolvedClasspathEntry(entry); File file = resolveEntry.getPath().toFile(); IPath path = resolveEntry.getPath(); if (!file.exists()) { String projectName = path.segment(0); IProject project = javaProject.getProject().getWorkspace().getRoot() .getProject(projectName); path = project.getLocation().append(path.removeFirstSegments(1)); } String spec = "jar:file:" + path.toString() + "!/" + name; try { URL url2 = new URL(spec); url2.getContent(); return url2; } catch (Exception e) { } } break; case IClasspathEntry.CPE_CONTAINER: break; case IClasspathEntry.CPE_VARIABLE: { { // TODO URL url = toURL(outPath.append(name)); if (url != null) { return url; } } } break; case IClasspathEntry.CPE_PROJECT: { if (isFirstProject || entry.isExported()) { URL url = findResourceURL(getJavaProject(entry), visited, false, name); if (url != null) { return url; } } break; } } } } catch (JavaModelException e) { e.printStackTrace(); } return null; } private static URL toURL(IPath outPath) { File file = outPath.toFile(); if (file != null && file.exists()) { try { return file.toURI().toURL(); } catch (MalformedURLException e) { e.printStackTrace(); } } return null; } private static void collectClasspathURLs(IJavaProject javaProject, List<URL> urls, Set<IJavaProject> visited, boolean isFirstProject) { if (visited.contains(javaProject)) return; visited.add(javaProject); try { IPath outPath = javaProject.getProject().getWorkspace().getRoot().getFullPath() .append(javaProject.getOutputLocation()); outPath = outPath.addTrailingSeparator(); URL out = createFileURL(outPath); urls.add(out); IClasspathEntry[] entries = null; entries = javaProject.getResolvedClasspath(true); for (IClasspathEntry entry : entries) { switch (entry.getEntryKind()) { case IClasspathEntry.CPE_LIBRARY: case IClasspathEntry.CPE_CONTAINER: case IClasspathEntry.CPE_VARIABLE: collectClasspathEntryURL(entry, urls); break; case IClasspathEntry.CPE_PROJECT: { if (isFirstProject || entry.isExported()) collectClasspathURLs(getJavaProject(entry), urls, visited, false); break; } } } } catch (JavaModelException e) { return; } } private static URL createFileURL(IPath path) { URL url = null; try { url = new URL("file://" + path.toOSString()); } catch (MalformedURLException e) { e.printStackTrace(); } return url; } private static void collectClasspathEntryURL(IClasspathEntry entry, List<URL> urls) { URL url = createFileURL(entry.getPath()); if (url != null) urls.add(url); } private static IJavaProject getJavaProject(IClasspathEntry entry) { IProject proj = ResourcesPlugin.getWorkspace().getRoot().getProject(entry.getPath().segment(0)); if (proj != null) return JavaCore.create(proj); return null; } }