bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/actions/OpenRevisionAction.java

/*******************************************************************************
 * Copyright (c) 2006 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
 *******************************************************************************/

package org.eclipse.team.internal.ccvs.ui.actions;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.core.history.IFileRevision;
import org.eclipse.team.internal.ui.TeamUIMessages;
import org.eclipse.team.internal.ui.TeamUIPlugin;
import org.eclipse.team.internal.ui.actions.TeamAction;
import org.eclipse.team.internal.ui.history.FileRevisionEditorInput;
import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;

public class OpenRevisionAction extends TeamAction {

	public void run(IAction action) {
		run(new IRunnableWithProgress() {
			public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
				try {
					IStructuredSelection structSel = getSelection();

					Object[] objArray = structSel.toArray();

					for (int i = 0; i < objArray.length; i++) {
						IFileRevision revision = (IFileRevision) objArray[i];
						if (revision == null || !revision.exists()) {
							MessageDialog.openError(getShell(), TeamUIMessages.OpenRevisionAction_DeletedRevisionTitle, TeamUIMessages.OpenRevisionAction_DeletedRevisionMessage);
						} else {
							IStorage file = revision.getStorage(monitor);

							String id = getEditorID(file.getName(), file.getContents());
							getTargetPage().openEditor(new FileRevisionEditorInput(revision), id);
						}

					}

				} catch (Exception e) {
					throw new InvocationTargetException(e);
				}
			}
		}, TeamUIMessages.ConfigureProjectAction_configureProject, PROGRESS_BUSYCURSOR);
	}

	protected boolean isEnabled() throws TeamException {
		return true;
	}

	/* private */ String getEditorID(String fileName, InputStream contents) {
		IWorkbench workbench = TeamUIPlugin.getPlugin().getWorkbench();
		IEditorRegistry registry = workbench.getEditorRegistry();
		IWorkbenchPage page = workbench.getActiveWorkbenchWindow().getActivePage();

		IContentType type = null;
		if (contents != null) {
			try {
				type = Platform.getContentTypeManager().findContentTypeFor(contents, fileName);
			} catch (IOException e) {

			}
		}
		if (type == null) {
			type = Platform.getContentTypeManager().findContentTypeFor(fileName);
		}
		IEditorDescriptor descriptor = registry.getDefaultEditor(fileName, type);
		String id;
		if (descriptor == null) {
			id = "org.eclipse.ui.DefaultTextEditor"; //$NON-NLS-1$
		} else {
			id = descriptor.getId();
		}

		return id;
	}

}