001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Thierry Delprat
018 *     Gagnavarslan ehf
019 */
020package org.nuxeo.ecm.webdav.backend;
021
022import javax.servlet.http.HttpServletRequest;
023
024import org.nuxeo.ecm.core.api.CoreSession;
025import org.nuxeo.ecm.webdav.service.WIRequestFilter;
026import org.nuxeo.ecm.webengine.WebEngine;
027import org.nuxeo.ecm.webengine.model.WebContext;
028
029public abstract class AbstractBackendFactory implements BackendFactory {
030
031    @Override
032    public Backend getBackend(String path, HttpServletRequest request) {
033        if (request == null) {
034            throw new NullPointerException("null request");
035        }
036        Backend backend = (Backend) request.getAttribute(WIRequestFilter.BACKEND_KEY);
037        if (backend == null) {
038            // create backend from WebEngine session
039            WebContext webContext = WebEngine.getActiveContext();
040            if (webContext == null) {
041                throw new NullPointerException("null WebContext");
042            }
043            CoreSession session = webContext.getCoreSession();
044            if (session == null) {
045                throw new NullPointerException("null CoreSession");
046            }
047            backend = createRootBackend(session);
048            request.setAttribute(WIRequestFilter.BACKEND_KEY, backend);
049        }
050        return backend.getBackend(path);
051    }
052
053    public abstract Backend createRootBackend(CoreSession session);
054
055}