Java tutorial
/******************************************************************************* * Copyright (c) 2005-2008 Polarion Software. * 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: * Igor Burilo - Initial API and implementation *******************************************************************************/ package org.eclipse.team.svn.revision.graph.operation; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.team.svn.core.connector.ISVNConnector; import org.eclipse.team.svn.core.connector.SVNConnectorCancelException; import org.eclipse.team.svn.core.connector.SVNConnectorException; import org.eclipse.team.svn.core.connector.SVNRevision; import org.eclipse.team.svn.core.connector.SVNRevisionRange; import org.eclipse.team.svn.core.operation.AbstractActionOperation; import org.eclipse.team.svn.core.operation.ActivityCancelledException; import org.eclipse.team.svn.core.operation.SVNProgressMonitor; import org.eclipse.team.svn.core.resource.IRepositoryLocation; import org.eclipse.team.svn.core.resource.IRepositoryResource; import org.eclipse.team.svn.core.resource.IRepositoryRoot; import org.eclipse.team.svn.core.utility.SVNLogEntryCallbackWithMergeInfo; import org.eclipse.team.svn.core.utility.SVNUtility; import org.eclipse.team.svn.revision.graph.SVNRevisionGraphMessages; import org.eclipse.team.svn.revision.graph.operation.RepositoryConnectionInfo.IRepositoryConnectionInfoProvider; import org.eclipse.team.svn.ui.utility.UIMonitorUtility; /** * Check connection to repository and returns last revision in repository. * If there's connection it also verifies if server supports merge info. * If there's no connection it asks user whether to use data from cache, * if user doesn't want to continue then cancel execution, i.e. throw cancel exception * * @author Igor Burilo */ public class CheckRepositoryConnectionOperation extends AbstractActionOperation implements IRepositoryConnectionInfoProvider { protected IRepositoryResource resource; //indicates that it's decided to include merge info protected boolean canIncludeMergeInfo; /* there can be cases where we don't want to validate if server * supports merge info, e.g. when we call refresh we already know * if we support it as we checked it in previous step */ protected boolean isValidateMergeInfo; //output protected boolean hasConnection; protected long lastRepositoryRevision; protected boolean isServerSupportsMergeInfo; public CheckRepositoryConnectionOperation(IRepositoryResource resource, boolean canIncludeMergeInfo, boolean isValidateMergeInfo) { super("Operation_CheckRepositoryConnection", SVNRevisionGraphMessages.class); //$NON-NLS-1$ this.resource = resource; this.canIncludeMergeInfo = canIncludeMergeInfo; this.isValidateMergeInfo = isValidateMergeInfo; } protected void runImpl(IProgressMonitor monitor) throws Exception { this.isServerSupportsMergeInfo = this.canIncludeMergeInfo; IRepositoryRoot root = this.resource.getRepositoryLocation().getRepositoryRoot(); try { this.lastRepositoryRevision = root.getRevision(); this.hasConnection = this.lastRepositoryRevision != SVNRevision.INVALID_REVISION_NUMBER; } catch (SVNConnectorException e) { if (e instanceof SVNConnectorCancelException) { throw e; } else { this.hasConnection = false; } } if (!this.hasConnection) { final boolean[] isProceedWithoutConnection = new boolean[] { false }; //ask if there's no connection UIMonitorUtility.getDisplay().syncExec(new Runnable() { public void run() { MessageDialog dlg = new MessageDialog(UIMonitorUtility.getShell(), SVNRevisionGraphMessages.Dialog_GraphTitle, null, SVNRevisionGraphMessages.CheckRepositoryConnectionOperation_DialogMessage, MessageDialog.QUESTION, new String[] { IDialogConstants.YES_LABEL, IDialogConstants.NO_LABEL }, 0); isProceedWithoutConnection[0] = dlg.open() == 0; } }); if (!isProceedWithoutConnection[0]) { throw new ActivityCancelledException(); } } else if (this.isValidateMergeInfo && this.canIncludeMergeInfo) { this.checkMergeInfo(monitor); } } protected void checkMergeInfo(IProgressMonitor monitor) { IRepositoryLocation location = this.resource.getRepositoryLocation(); ISVNConnector proxy = location.acquireSVNProxy(); try { proxy.listHistoryLog(SVNUtility.getEntryReference(location.getRepositoryRoot()), new SVNRevisionRange[] { new SVNRevisionRange(this.lastRepositoryRevision, this.lastRepositoryRevision) }, new String[0], 1, ISVNConnector.Options.INCLUDE_MERGED_REVISIONS, new SVNLogEntryCallbackWithMergeInfo(), new SVNProgressMonitor(this, monitor, null)); this.isServerSupportsMergeInfo = true; } catch (SVNConnectorException e) { this.isServerSupportsMergeInfo = false; } finally { location.releaseSVNProxy(proxy); } if (!this.isServerSupportsMergeInfo) { UIMonitorUtility.getDisplay().syncExec(new Runnable() { public void run() { MessageDialog dlg = new MessageDialog(UIMonitorUtility.getShell(), SVNRevisionGraphMessages.Dialog_GraphTitle, null, SVNRevisionGraphMessages.CheckRepositoryConnectionOperation_MergeNotSupported, MessageDialog.INFORMATION, new String[] { IDialogConstants.OK_LABEL }, 0); dlg.open(); } }); } } public RepositoryConnectionInfo getRepositoryConnectionInfo() { return new RepositoryConnectionInfo(this.hasConnection, this.lastRepositoryRevision, this.isServerSupportsMergeInfo); } }