org.eclipse.jdt.internal.core.DiscardWorkingCopyOperation Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2015 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
* Stephan Herrmann - Contribution for
* Bug 458577 - IClassFile.getWorkingCopy() may lead to NPE in BecomeWorkingCopyOperation
*******************************************************************************/
package org.eclipse.jdt.internal.core;
import org.eclipse.core.resources.IResource;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaElementDelta;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaModelException;
/**
* Discards a working copy (decrement its use count and remove its working copy info if the use count is 0)
* and signal its removal through a delta.
*/
public class DiscardWorkingCopyOperation extends JavaModelOperation {
public DiscardWorkingCopyOperation(IJavaElement workingCopy) {
super(new IJavaElement[] {workingCopy});
}
protected void executeOperation() throws JavaModelException {
CompilationUnit workingCopy = getWorkingCopy();
JavaModelManager manager = JavaModelManager.getJavaModelManager();
int useCount = manager.discardPerWorkingCopyInfo(workingCopy);
if (useCount == 0) {
IJavaProject javaProject = workingCopy.getJavaProject();
if (ExternalJavaProject.EXTERNAL_PROJECT_NAME.equals(javaProject.getElementName())) {
manager.removePerProjectInfo((JavaProject) javaProject, true /* remove external jar files indexes and timestamps*/);
manager.containerRemove(javaProject);
}
if (!workingCopy.isPrimary()) {
// report removed java delta for a non-primary working copy
JavaElementDelta delta = new JavaElementDelta(getJavaModel());
delta.removed(workingCopy);
addDelta(delta);
removeReconcileDelta(workingCopy);
} else {
IResource resource = workingCopy.getResource();
if (resource != null) {
if (resource.isAccessible()) {
// report a F_PRIMARY_WORKING_COPY change delta for a primary working copy
JavaElementDelta delta = new JavaElementDelta(getJavaModel());
delta.changed(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
addDelta(delta);
} else {
// report a REMOVED delta
JavaElementDelta delta = new JavaElementDelta(getJavaModel());
delta.removed(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
addDelta(delta);
}
}
}
}
}
/**
* Returns the working copy this operation is working on.
*/
protected CompilationUnit getWorkingCopy() {
return (CompilationUnit)getElementToProcess();
}
/**
* @see JavaModelOperation#isReadOnly
*/
public boolean isReadOnly() {
return true;
}
}