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/*******************************************************************************
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* Copyright (c) 2008, 2009 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package eu.etaxonomy.taxeditor.update;
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import org.eclipse.core.commands.AbstractHandler;
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import org.eclipse.core.commands.ExecutionEvent;
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import org.eclipse.core.runtime.jobs.IJobChangeEvent;
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import org.eclipse.core.runtime.jobs.Job;
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import org.eclipse.core.runtime.jobs.JobChangeAdapter;
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import org.eclipse.equinox.p2.ui.LoadMetadataRepositoryJob;
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import org.eclipse.equinox.p2.ui.ProvisioningUI;
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import org.eclipse.swt.widgets.Shell;
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import org.eclipse.ui.PlatformUI;
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/**
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* PreloadingRepositoryHandler provides background loading of
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* repositories before executing the provisioning handler.
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*
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* @since 3.5
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*/
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abstract class PreloadingRepositoryHandler extends AbstractHandler {
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/**
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* The constructor.
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*/
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public PreloadingRepositoryHandler() {
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// constructor
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}
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/**
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* Execute the command.
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*/
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public Object execute(ExecutionEvent event) {
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doExecuteAndLoad();
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return null;
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}
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void doExecuteAndLoad() {
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if (preloadRepositories()) {
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//cancel any load that is already running
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Job.getJobManager().cancel(LoadMetadataRepositoryJob.LOAD_FAMILY);
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final LoadMetadataRepositoryJob loadJob = new LoadMetadataRepositoryJob(getProvisioningUI());
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setLoadJobProperties(loadJob);
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if (waitForPreload()) {
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loadJob.addJobChangeListener(new JobChangeAdapter() {
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public void done(IJobChangeEvent event) {
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if (PlatformUI.isWorkbenchRunning())
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if (event.getResult().isOK()) {
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PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
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public void run() {
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doExecute(loadJob);
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}
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});
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}
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}
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});
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loadJob.setUser(true);
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loadJob.schedule();
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} else {
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loadJob.setSystem(true);
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loadJob.setUser(false);
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loadJob.schedule();
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doExecute(null);
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}
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} else {
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doExecute(null);
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}
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}
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protected abstract void doExecute(LoadMetadataRepositoryJob job);
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protected boolean preloadRepositories() {
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return true;
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}
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protected boolean waitForPreload() {
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return true;
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}
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protected void setLoadJobProperties(Job loadJob) {
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loadJob.setProperty(LoadMetadataRepositoryJob.ACCUMULATE_LOAD_ERRORS, Boolean.toString(true));
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}
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protected ProvisioningUI getProvisioningUI() {
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return ProvisioningUI.getDefaultUI();
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}
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/**
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* Return a shell appropriate for parenting dialogs of this handler.
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* @return a Shell
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*/
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protected Shell getShell() {
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return PlatformUI.getWorkbench().getModalDialogShellProvider().getShell();
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}
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}
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