Java tutorial
/******************************************************************************* * Copyright (c) 2007 Red Hat, Inc. * Distributed under license by Red Hat, Inc. All rights reserved. * This program is 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: * Red Hat, Inc. - initial API and implementation ******************************************************************************/ package org.jboss.tools.jst.web.kb.internal.scanner; import java.io.File; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.Path; import org.eclipse.jdt.core.IClasspathEntry; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jdt.core.JavaCore; import org.jboss.tools.common.model.XJob; import org.jboss.tools.common.model.XJob.XRunnable; import org.jboss.tools.common.model.XModelObject; import org.jboss.tools.common.model.filesystems.FileSystemsHelper; import org.jboss.tools.common.model.plugin.ModelPlugin; import org.jboss.tools.common.model.project.ext.AbstractClassPathMonitor; import org.jboss.tools.common.model.util.EclipseResourceUtil; import org.jboss.tools.jst.web.WebModelPlugin; import org.jboss.tools.jst.web.kb.IKbProject; import org.jboss.tools.jst.web.kb.KbProjectFactory; import org.jboss.tools.jst.web.kb.WebKbPlugin; import org.jboss.tools.jst.web.kb.internal.KbProject; import org.jboss.tools.jst.web.model.helpers.InnerModelHelper; /** * Monitors class path of project and loads kb components of it. * * @author Viacheslav Kabanovich */ public class ClassPathMonitor extends AbstractClassPathMonitor<KbProject> { /** * Creates instance of class path for kb project * @param project */ public ClassPathMonitor(KbProject project) { this.project = project; } /** * Initialization of inner model. */ public void init() { model = InnerModelHelper.createXModel(project.getProject()); super.init(); } public IProject getProjectResource() { return project.getProject(); } boolean isProcessed = false; /** * Loads kb components from items recently added to class path. */ public void process() { isProcessed = true; try { doProcess(); } finally { isProcessed = false; } } protected void doProcess() { if (paths == null) { ModelPlugin.getDefault().logError("Failed to process class path in kb builder for project " + project); return; } for (String p : syncProcessedPaths()) { project.pathRemoved(new Path(p)); } for (int i = 0; i < paths.size(); i++) { String p = paths.get(i); if (!requestForLoad(p)) continue; LibraryScanner scanner = new LibraryScanner(); String fileName = new File(p).getName(); if (EclipseResourceUtil.SYSTEM_JAR_SET.contains(fileName)) continue; XModelObject o = FileSystemsHelper.getLibs(model).getLibrary(p); if (o == null) continue; LoadedDeclarations c = null; try { if (scanner.isLikelyComponentSource(o)) { c = scanner.parse(o, new Path(p), project); } } catch (ScannerException e) { WebModelPlugin.getDefault().logError(e); } if (c == null) { c = new LoadedDeclarations(); } componentsLoaded(c, new Path(p)); } validateProjectDependencies(); } public void waitProcess() { int count = 0; while (isProcessed) { try { synchronized (this) { wait(100); } count++; if (count >= 50) { String message = "Failed to wait for class path build"; WebKbPlugin.getDefault().logWarning(message, new Exception(message)); break; } } catch (InterruptedException e) { WebKbPlugin.getDefault().logError(e); break; } } } public void validateProjectDependencies() { List<KbProject> ps = null; try { ps = getKbProjects(project.getProject()); } catch (CoreException e) { WebModelPlugin.getDefault().logError(e); } if (ps != null) { Set<KbProject> set = project.getKbProjects(); Set<KbProject> removable = new HashSet<KbProject>(); removable.addAll(set); removable.removeAll(ps); ps.removeAll(set); for (KbProject p : ps) { project.addKbProject(p); } for (KbProject p : removable) { project.removeKbProject(p); } } } public boolean hasToUpdateProjectDependencies() { try { List<KbProject> ps = getKbProjects(project.getProject()); Set<KbProject> set = project.getKbProjects(); if (set.size() != ps.size()) { return true; } for (KbProject p : ps) { if (!set.contains(p)) return true; } } catch (CoreException e) { WebModelPlugin.getDefault().logError(e); } return false; } void componentsLoaded(LoadedDeclarations c, IPath path) { if (c == null) return; project.registerComponents(c, path); } List<KbProject> getKbProjects(IProject project) throws CoreException { List<KbProject> list = new ArrayList<KbProject>(); if (project.isAccessible() && project.hasNature(JavaCore.NATURE_ID)) { IJavaProject javaProject = JavaCore.create(project); IClasspathEntry[] es = javaProject.getResolvedClasspath(true); for (int i = 0; i < es.length; i++) { if (es[i].getEntryKind() == IClasspathEntry.CPE_PROJECT) { IProject p = ResourcesPlugin.getWorkspace().getRoot().getProject(es[i].getPath().lastSegment()); if (p == null || !p.isAccessible()) continue; KbProject.checkKBBuilderInstalled(p); IKbProject sp = KbProjectFactory.getKbProject(p, false); if (sp != null) list.add((KbProject) sp); } } } return list; } public void build() { waitProcess(); if (update()) { process(); } else if (hasToUpdateProjectDependencies()) { validateProjectDependencies(); } } public void pathsChanged(List<String> paths) { super.pathsChanged(paths); if (project.isStorageResolved()) { XJob.addRunnableWithPriority(new XRunnable() { public void run() { if (!isProcessed && update()) { // System.out.println("Running " + getId()); process(); } } public String getId() { return "Update class path of kb project " + project.getProject().getName(); //$NON-NLS-1$ } }); } } }