org.eclipse.jdt.internal.core.BecomeWorkingCopyOperation.java Source code

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Here is the source code for org.eclipse.jdt.internal.core.BecomeWorkingCopyOperation.java

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/*******************************************************************************
 * Copyright (c) 2000, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * 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.*;

/**
 * Switch and ICompilationUnit to working copy mode
 * and signal the working copy addition through a delta.
 */
public class BecomeWorkingCopyOperation extends JavaModelOperation {

    IProblemRequestor problemRequestor;

    /*
     * Creates a BecomeWorkingCopyOperation for the given working copy.
     * perOwnerWorkingCopies map is not null if the working copy is a shared working copy.
     */
    public BecomeWorkingCopyOperation(CompilationUnit workingCopy, IProblemRequestor problemRequestor) {
        super(new IJavaElement[] { workingCopy });
        this.problemRequestor = problemRequestor;
    }

    @Override
    protected void executeOperation() throws JavaModelException {

        // open the working copy now to ensure contents are that of the current state of this element
        CompilationUnit workingCopy = getWorkingCopy();
        JavaModelManager.getJavaModelManager().getPerWorkingCopyInfo(workingCopy, true/*create if needed*/,
                true/*record usage*/, this.problemRequestor);
        workingCopy.openWhenClosed(workingCopy.createElementInfo(), true, this.progressMonitor);

        if (!workingCopy.isPrimary()) {
            // report added java delta for a non-primary working copy
            JavaElementDelta delta = new JavaElementDelta(getJavaModel());
            delta.added(workingCopy);
            addDelta(delta);
        } 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 an ADDED delta
                    JavaElementDelta delta = new JavaElementDelta(getJavaModel());
                    delta.added(workingCopy, IJavaElementDelta.F_PRIMARY_WORKING_COPY);
                    addDelta(delta);
                }
            }
        }

        this.resultElements = new IJavaElement[] { workingCopy };
    }

    /*
     * Returns the working copy this operation is working on.
     */
    protected CompilationUnit getWorkingCopy() {
        return (CompilationUnit) getElementToProcess();
    }

    /*
     * @see JavaModelOperation#isReadOnly
     */
    @Override
    public boolean isReadOnly() {
        return true;
    }

}