| /******************************************************************************* |
| * Copyright (c) 2000, 2008 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.core; |
| |
| import java.util.HashSet; |
| import java.util.Iterator; |
| |
| import org.eclipse.core.resources.IProject; |
| import org.eclipse.core.resources.IProjectDescription; |
| import org.eclipse.core.resources.IResource; |
| import org.eclipse.core.resources.IWorkspace; |
| import org.eclipse.core.resources.IWorkspaceRoot; |
| import org.eclipse.core.resources.IWorkspaceRunnable; |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.jobs.ISchedulingRule; |
| import org.eclipse.jdt.core.IClasspathEntry; |
| import org.eclipse.jdt.core.JavaModelException; |
| import org.eclipse.jdt.core.compiler.CharOperation; |
| import org.eclipse.jdt.internal.core.util.Util; |
| |
| public class ProjectReferenceChange { |
| |
| private JavaProject project; |
| private IClasspathEntry[] oldResolvedClasspath; |
| |
| public ProjectReferenceChange(JavaProject project, IClasspathEntry[] oldResolvedClasspath) { |
| this.project = project; |
| this.oldResolvedClasspath = oldResolvedClasspath; |
| } |
| |
| /* |
| * Update projects references so that the build order is consistent with the classpath |
| */ |
| public void updateProjectReferencesIfNecessary() throws JavaModelException { |
| |
| String[] oldRequired = this.oldResolvedClasspath == null ? CharOperation.NO_STRINGS : this.project.projectPrerequisites(this.oldResolvedClasspath); |
| IClasspathEntry[] newResolvedClasspath = this.project.getResolvedClasspath(); |
| String[] newRequired = this.project.projectPrerequisites(newResolvedClasspath); |
| final IProject projectResource = this.project.getProject(); |
| |
| try { |
| IProject[] projectReferences = projectResource.getDescription().getDynamicReferences(); |
| |
| HashSet oldReferences = new HashSet(projectReferences.length); |
| for (int i = 0; i < projectReferences.length; i++){ |
| String projectName = projectReferences[i].getName(); |
| oldReferences.add(projectName); |
| } |
| HashSet newReferences = (HashSet)oldReferences.clone(); |
| |
| for (int i = 0; i < oldRequired.length; i++){ |
| String projectName = oldRequired[i]; |
| newReferences.remove(projectName); |
| } |
| for (int i = 0; i < newRequired.length; i++){ |
| String projectName = newRequired[i]; |
| newReferences.add(projectName); |
| } |
| |
| Iterator iter; |
| int newSize = newReferences.size(); |
| |
| checkIdentity: { |
| if (oldReferences.size() == newSize){ |
| iter = newReferences.iterator(); |
| while (iter.hasNext()){ |
| if (!oldReferences.contains(iter.next())){ |
| break checkIdentity; |
| } |
| } |
| return; |
| } |
| } |
| String[] requiredProjectNames = new String[newSize]; |
| int index = 0; |
| iter = newReferences.iterator(); |
| while (iter.hasNext()){ |
| requiredProjectNames[index++] = (String)iter.next(); |
| } |
| Util.sort(requiredProjectNames); // ensure that if changed, the order is consistent |
| |
| final IProject[] requiredProjectArray = new IProject[newSize]; |
| IWorkspaceRoot wksRoot = projectResource.getWorkspace().getRoot(); |
| for (int i = 0; i < newSize; i++){ |
| requiredProjectArray[i] = wksRoot.getProject(requiredProjectNames[i]); |
| } |
| |
| // ensure that a scheduling rule is used so that the project description is not modified by another thread while we update it |
| // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=214981 |
| // also ensure that if no change (checkIdentify block returned above) we don't reach here |
| // see https://bugs.eclipse.org/bugs/show_bug.cgi?id=241751 |
| IWorkspace workspace = projectResource.getWorkspace(); |
| ISchedulingRule rule = workspace.getRuleFactory().modifyRule(projectResource); // scheduling rule for modifying the project |
| IWorkspaceRunnable runnable = new IWorkspaceRunnable() { |
| public void run(IProgressMonitor monitor) throws CoreException { |
| IProjectDescription description = projectResource.getDescription(); |
| description.setDynamicReferences(requiredProjectArray); |
| projectResource.setDescription(description, IResource.AVOID_NATURE_CONFIG, null); |
| } |
| }; |
| workspace.run(runnable, rule, IWorkspace.AVOID_UPDATE, null); |
| } catch(CoreException e){ |
| if (!ExternalJavaProject.EXTERNAL_PROJECT_NAME.equals(this.project.getElementName())) |
| throw new JavaModelException(e); |
| } |
| } |
| public String toString() { |
| return "ProjectRefenceChange: " + this.project.getElementName(); //$NON-NLS-1$ |
| } |
| } |