TreeParserResourceVariant.java

/*******************************************************************************
 * Copyright (C) 2015, Obeo.
 *
 * 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
 *******************************************************************************/
package org.eclipse.emf.compare.egit.internal.storage;

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import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.treewalk.CanonicalTreeParser;
import org.eclipse.team.core.TeamException;

/**
 * Implementation of a resource variant populated through a CanonicalTreeParser. This can provide access to
 * local resources as well as their remote variants.
 * 
 * @author <a href="mailto:laurent.goubet@obeo.fr">Laurent Goubet</a>
 */
public class TreeParserResourceVariant extends AbstractGitResourceVariant {

	/**
	 * The workspace-relative path of this resource.
	 */
	private IPath workspacePath;

	private TreeParserResourceVariant(Repository repository, String path, IPath workspacePath,
			boolean isContainer, ObjectId objectId, int rawMode) {
		super(repository, path, isContainer, objectId, rawMode);
		this.workspacePath = workspacePath;
	}

	/**
	 * Constructs a resource variant corresponding to the current entry of the given CanonicalTreeParser.
	 *
	 * @param repository
	 *            Repository from which this CanonicalTreeParser was created.
	 * @param treeParser
	 *            A CanonicalTreeParser to retrieve information from. This will only read information about
	 *            the current entry on which this parser is positioned and will not change its state.
	 * @param workspacePath
	 *            The workspace-relative path of this resource.
	 * @return The created variant.
	 */
	public static TreeParserResourceVariant create(Repository repository, CanonicalTreeParser treeParser,
			IPath workspacePath) {
		final String path = treeParser.getEntryPathString();
		final boolean isContainer = FileMode.TREE.equals(treeParser.getEntryFileMode());
		final ObjectId objectId = treeParser.getEntryObjectId();
		final int rawMode = treeParser.getEntryRawMode();

		return new TreeParserResourceVariant(repository, path, workspacePath, isContainer, objectId, rawMode);
	}

	public IStorage getStorage(IProgressMonitor monitor) throws TeamException {
		return new WorkspaceGitBlobStorage(repository, path, workspacePath, objectId);
	}
}
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