org.jbpm.designer.web.server.ProcessDiffServiceServlet.java Source code

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Here is the source code for org.jbpm.designer.web.server.ProcessDiffServiceServlet.java

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/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

package org.jbpm.designer.web.server;

import java.io.IOException;
import org.jbpm.designer.util.Utils;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import javax.inject.Inject;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.jbpm.designer.web.profile.IDiagramProfile;
import org.jbpm.designer.web.profile.IDiagramProfileService;
import org.jbpm.designer.web.profile.impl.RepositoryInfo;
import org.json.JSONObject;

/**
 * 
 * Queries Guvnor for process version info.
 * 
 * @author Tihomir Surdilovic
 */
public class ProcessDiffServiceServlet extends HttpServlet {
    private static final Logger _logger = LoggerFactory.getLogger(ProcessDiffServiceServlet.class);

    protected IDiagramProfile profile;

    @Inject
    private IDiagramProfileService _profileService = null;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String uuid = Utils.getUUID(req);
        String profileName = Utils.getDefaultProfileName(req.getParameter("profile"));
        String action = req.getParameter("action");
        String versionNum = req.getParameter("version");

        if (profile == null) {
            profile = _profileService.findProfile(req, profileName);
        }
        String[] packageAssetInfo = ServletUtil.findPackageAndAssetInfo(uuid, profile);
        String packageName = packageAssetInfo[0];
        String assetName = packageAssetInfo[1];
        if (action != null && action.equals("getversion") && versionNum != null) {
            resp.setCharacterEncoding("UTF-8");
            resp.setContentType("text/xml");
            try {
                resp.getWriter().write(getAssetVerionSource(packageName, assetName, versionNum, profile));
            } catch (Throwable t) {
                resp.getWriter().write("");
            }
        } else {
            List<String> versionList;
            try {
                versionList = getAssetVersions(packageName, assetName, uuid, profile);
            } catch (Throwable t) {
                versionList = new ArrayList<String>();
            }
            JSONObject jsonObject = new JSONObject();
            if (versionList != null && versionList.size() > 0) {
                for (String version : versionList) {
                    try {
                        jsonObject.put(version, version);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
            resp.setCharacterEncoding("UTF-8");
            resp.setContentType("application/json");
            resp.getWriter().write(jsonObject.toString());
        }
    }

    private String getAssetVerionSource(String packageName, String assetName, String versionNum,
            IDiagramProfile profile) {
        try {
            String versionURL = RepositoryInfo.getRepositoryProtocol(profile) + "://"
                    + RepositoryInfo.getRepositoryHost(profile) + "/"
                    + RepositoryInfo.getRepositorySubdomain(profile).substring(0,
                            RepositoryInfo.getRepositorySubdomain(profile).indexOf("/"))
                    + "/rest/packages/" + URLEncoder.encode(packageName, "UTF-8") + "/assets/" + assetName
                    + "/versions/" + versionNum + "/source/";

            return IOUtils.toString(ServletUtil.getInputStreamForURL(versionURL, "GET", profile), "UTF-8");
        } catch (Exception e) {
            return "";
        }
    }

    private List<String> getAssetVersions(String packageName, String assetName, String uuid,
            IDiagramProfile profile) {
        try {
            String assetVersionURL = RepositoryInfo.getRepositoryProtocol(profile) + "://"
                    + RepositoryInfo.getRepositoryHost(profile) + "/"
                    + RepositoryInfo.getRepositorySubdomain(profile).substring(0,
                            RepositoryInfo.getRepositorySubdomain(profile).indexOf("/"))
                    + "/rest/packages/" + URLEncoder.encode(packageName, "UTF-8") + "/assets/" + assetName
                    + "/versions/";
            List<String> versionList = new ArrayList<String>();

            XMLInputFactory factory = XMLInputFactory.newInstance();
            XMLStreamReader reader = factory.createXMLStreamReader(
                    ServletUtil.getInputStreamForURL(assetVersionURL, "GET", profile), "UTF-8");
            boolean isFirstTitle = true;
            String title = "";
            while (reader.hasNext()) {
                int next = reader.next();
                if (next == XMLStreamReader.START_ELEMENT) {
                    if ("title".equals(reader.getLocalName())) {
                        if (isFirstTitle) {
                            isFirstTitle = false;
                        } else {
                            versionList.add(reader.getElementText());
                        }
                    }
                }
            }
            return versionList;
        } catch (Exception e) {
            _logger.error(e.getMessage());
            return null;
        }
    }
}