org.eclipse.orion.server.git.objects.StashPage.java Source code

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Here is the source code for org.eclipse.orion.server.git.objects.StashPage.java

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/*******************************************************************************
 * Copyright (c) 2014 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.orion.server.git.objects;

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collection;
import org.eclipse.core.runtime.*;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.orion.internal.server.servlets.ProtocolConstants;
import org.eclipse.orion.server.core.resources.Property;
import org.eclipse.orion.server.core.resources.ResourceShape;
import org.eclipse.orion.server.core.resources.annotations.PropertyDescription;
import org.eclipse.orion.server.core.resources.annotations.ResourceDescription;
import org.eclipse.orion.server.git.GitConstants;
import org.eclipse.orion.server.git.servlets.GitServlet;
import org.json.*;

@ResourceDescription(type = Stash.TYPE)
public class StashPage extends GitObject {

    private static final ResourceShape DEFAULT_RESOURCE_SHAPE = new ResourceShape();
    {
        Property[] defaultProperties = new Property[] { //
                new Property(ProtocolConstants.KEY_LOCATION), // super
                new Property(GitConstants.KEY_CLONE), // super
                new Property(ProtocolConstants.KEY_CHILDREN), //
                new Property(ProtocolConstants.KEY_PREVIOUS_LOCATION), //
                new Property(ProtocolConstants.KEY_NEXT_LOCATION) };
        DEFAULT_RESOURCE_SHAPE.setProperties(defaultProperties);
    }

    protected Collection<RevCommit> stash;
    private int pageSize;
    private int page;

    public StashPage(URI cloneLocation, Repository db, Collection<RevCommit> stash, int page, int pageSize) {
        super(cloneLocation, db);
        this.stash = stash;

        this.page = Math.max(1, page);
        this.pageSize = Math.max(0, pageSize);
    }

    @PropertyDescription(name = ProtocolConstants.KEY_CHILDREN)
    protected JSONArray getChildren()
            throws GitAPIException, JSONException, URISyntaxException, IOException, CoreException {

        int toSkip = (page - 1) * pageSize;
        JSONArray children = new JSONArray();
        int curr = 1, arrLength = 0;

        for (RevCommit revCommit : stash) {
            if (curr++ > toSkip) {

                if (arrLength++ >= pageSize)
                    break;

                Stash commit = new Stash(cloneLocation, db, revCommit, null);
                children.put(commit.toJSON());
            }
        }

        return children;
    }

    @PropertyDescription(name = ProtocolConstants.KEY_PREVIOUS_LOCATION)
    protected URI getPreviousPageLocation() throws URISyntaxException {
        if (page > 1) {
            URI location = getLocation();
            String query = String.format("page=%d&pageSize=%d", (page - 1), pageSize); //$NON-NLS-1$
            return new URI(location.getScheme(), location.getAuthority(), location.getPath(), query,
                    location.getFragment());
        }

        return null;
    }

    @PropertyDescription(name = ProtocolConstants.KEY_NEXT_LOCATION)
    protected URI getNextPageLocation() throws URISyntaxException {
        if (hasNextPage()) {
            URI location = getLocation();
            String query = String.format("page=%d&pageSize=%d", (page + 1), pageSize); //$NON-NLS-1$
            return new URI(location.getScheme(), location.getAuthority(), location.getPath(), query,
                    location.getFragment());
        }

        return null;
    }

    protected boolean hasNextPage() {
        return stash.size() > (page * pageSize);
    }

    @Override
    protected URI getLocation() throws URISyntaxException {

        IPath stashPath = new Path(GitServlet.GIT_URI).append(Stash.RESOURCE);

        //clone location is of the form /gitapi/clone/file/{workspaceId}/{projectName}[/{path}]
        IPath clonePath = new Path(cloneLocation.getPath()).removeFirstSegments(2);
        stashPath = stashPath.append(clonePath);

        return new URI(cloneLocation.getScheme(), cloneLocation.getAuthority(), stashPath.toString(), null, null);
    }

    public JSONObject toJSON() throws JSONException, URISyntaxException, IOException, CoreException {
        return jsonSerializer.serialize(this, DEFAULT_RESOURCE_SHAPE);
    }
}