melnorme.lang.ide.ui.actions.OperationRunnableWithProgress.java Source code

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Here is the source code for melnorme.lang.ide.ui.actions.OperationRunnableWithProgress.java

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/*******************************************************************************
 * Copyright (c) 2015, 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:
 *     Bruno Medeiros - initial API and implementation
 *******************************************************************************/
package melnorme.lang.ide.ui.actions;

import static melnorme.utilbox.core.Assert.AssertNamespace.assertFail;

import java.lang.reflect.InvocationTargetException;

import melnorme.lang.ide.core.LangCore;
import melnorme.lang.ide.core.LangCoreMessages;
import melnorme.lang.ide.ui.LangUIPlugin;
import melnorme.utilbox.concurrency.OperationCancellation;
import melnorme.utilbox.core.CommonException;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.progress.IProgressService;

public abstract class OperationRunnableWithProgress implements IRunnableWithProgress {

    protected volatile Exception exceptionResult;

    public void runUnderWorkbenchProgressService() throws OperationCancellation, CoreException {
        IProgressService progressService = PlatformUI.getWorkbench().getProgressService();
        runUnderProgressService(progressService);
    }

    public void runUnderProgressService(IProgressService ps) throws OperationCancellation, CoreException {
        try {
            ps.busyCursorWhile(this);
        } catch (InterruptedException e) {
            // This should not happen
            throw LangUIPlugin.createCoreException(LangCoreMessages.LangCore_internalError, e);
        } catch (InvocationTargetException e) {
            // This should not happen either, unless doRun threw a RuntimeException
            throw LangUIPlugin.createCoreException(LangCoreMessages.LangCore_internalError, e);
        }

        rethrowResultException();
    }

    public void rethrowResultException() throws CoreException, OperationCancellation {
        if (exceptionResult != null) {
            try {
                throw exceptionResult;
            } catch (CoreException | OperationCancellation e) {
                throw e; // rethrow
            } catch (Exception e) {
                throw assertFail();
            }
        }
    }

    @Override
    public final void run(IProgressMonitor monitor) {
        try {
            doRun_toCoreException(monitor);
        } catch (OperationCancellation oc) {
            exceptionResult = new OperationCancellation();
        } catch (CoreException ce) {
            if (monitor.isCanceled()) {
                exceptionResult = new OperationCancellation();
            } else {
                exceptionResult = ce;
            }
        } catch (OperationCanceledException oce) {
            exceptionResult = new OperationCancellation();
        }
    }

    public void doRun_toCoreException(IProgressMonitor monitor) throws CoreException, OperationCancellation {
        try {
            doRun(monitor);
        } catch (CommonException ce) {
            throw LangCore.createCoreException(ce);
        }
    }

    protected abstract void doRun(IProgressMonitor monitor)
            throws CoreException, CommonException, OperationCancellation;

}