org.eclipse.egit.core.synchronize.GitBlobResourceVariant.java Source code

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Here is the source code for org.eclipse.egit.core.synchronize.GitBlobResourceVariant.java

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/*******************************************************************************
 * Copyright (c) 2010 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
 *     Dariusz Luksza <dariusz@luksza.org>
 *******************************************************************************/
package org.eclipse.egit.core.synchronize;

import java.io.IOException;
import java.io.InputStream;

import org.eclipse.core.resources.IEncodedStorage;
import org.eclipse.core.resources.IStorage;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.content.IContentDescription;
import org.eclipse.core.runtime.content.IContentTypeManager;
import org.eclipse.egit.core.Activator;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.team.core.TeamException;

/**
 * This is a representation of a file's blob in some branch.
 */
public class GitBlobResourceVariant extends GitResourceVariant {

    private IStorage storage;

    private final ObjectLoader blob;

    GitBlobResourceVariant(Repository repo, RevCommit revCommit, ObjectId objectId, String path)
            throws IOException {
        super(repo, revCommit, objectId, path);

        blob = repo.open(getObjectId());
    }

    public boolean isContainer() {
        return false;
    }

    public IStorage getStorage(IProgressMonitor monitor) throws TeamException {
        if (storage == null) {
            storage = new IEncodedStorage() {
                public Object getAdapter(Class adapter) {
                    return null;
                }

                public boolean isReadOnly() {
                    return true;
                }

                public String getName() {
                    return GitBlobResourceVariant.this.getName();
                }

                public IPath getFullPath() {
                    return null;
                }

                public InputStream getContents() throws CoreException {
                    try {
                        return blob.openStream();
                    } catch (IOException e) {
                        throw new TeamException(e.getMessage(), e);
                    }
                }

                public String getCharset() throws CoreException {
                    IContentTypeManager manager = Platform.getContentTypeManager();
                    try {
                        IContentDescription description = manager.getDescriptionFor(getContents(), getName(),
                                IContentDescription.ALL);
                        return description == null ? null : description.getCharset();
                    } catch (IOException e) {
                        throw new CoreException(
                                new Status(IStatus.ERROR, Activator.getPluginId(), e.getMessage(), e));
                    }
                }
            };
        }

        return storage;
    }

}