| /* |
| * Copyright 2005 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * 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.apache.jackrabbit.webdav.version.report; |
| |
| import org.apache.log4j.Logger; |
| import org.apache.jackrabbit.webdav.property.DavPropertyNameSet; |
| import org.apache.jackrabbit.webdav.version.DeltaVConstants; |
| import org.apache.jackrabbit.webdav.version.DeltaVResource; |
| import org.apache.jackrabbit.webdav.version.VersionControlledResource; |
| import org.apache.jackrabbit.webdav.version.VersionResource; |
| import org.apache.jackrabbit.webdav.DavException; |
| import org.apache.jackrabbit.webdav.DavServletResponse; |
| import org.apache.jackrabbit.webdav.MultiStatus; |
| import org.apache.jackrabbit.webdav.DavResource; |
| import org.apache.jackrabbit.webdav.DavResourceIterator; |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Document; |
| |
| /** |
| * <code>VersionTreeReport</code> encapsulates the DAV:version-tree report. |
| * It describes the requested properties of all the versions in the version |
| * history of a version. The DAV:version-tree report must be supported by all |
| * version resources and all version-controlled resources. |
| */ |
| public class VersionTreeReport implements Report, DeltaVConstants { |
| |
| private static Logger log = Logger.getLogger(VersionTreeReport.class); |
| |
| private ReportInfo info; |
| private DeltaVResource resource; |
| |
| /** |
| * Returns {@link ReportType#VERSION_TREE} |
| * |
| * @return {@link ReportType#VERSION_TREE} |
| * @see Report#getType() |
| */ |
| public ReportType getType() { |
| return ReportType.VERSION_TREE; |
| } |
| |
| /** |
| * Always returns <code>true</code>. |
| * |
| * @return true |
| * @see org.apache.jackrabbit.webdav.version.report.Report#isMultiStatusReport() |
| */ |
| public boolean isMultiStatusReport() { |
| return true; |
| } |
| |
| /** |
| * Validates the specified resource and info objects. |
| * |
| * @param resource |
| * @param info |
| * @throws org.apache.jackrabbit.webdav.DavException |
| * @see Report#init(org.apache.jackrabbit.webdav.version.DeltaVResource, ReportInfo) |
| */ |
| public void init(DeltaVResource resource, ReportInfo info) throws DavException { |
| setResource(resource); |
| setInfo(info); |
| } |
| |
| /** |
| * Set the <code>DeltaVResource</code> used to register this report. |
| * |
| * @param resource |
| * @throws DavException if the given resource is neither |
| * {@link org.apache.jackrabbit.webdav.version.VersionControlledResource} nor {@link org.apache.jackrabbit.webdav.version.VersionResource}. |
| */ |
| private void setResource(DeltaVResource resource) throws DavException { |
| if (resource != null && (resource instanceof VersionControlledResource || resource instanceof VersionResource)) { |
| this.resource = resource; |
| } else { |
| throw new DavException(DavServletResponse.SC_BAD_REQUEST, "DAV:version-tree report can only be created for version-controlled resources and version resources."); |
| } |
| } |
| |
| /** |
| * Set the <code>ReportInfo</code> as specified by the REPORT request body, |
| * that defines the details for this report. |
| * |
| * @param info |
| * @throws DavException if the given <code>ReportInfo</code> |
| * does not contain a DAV:version-tree element. |
| */ |
| private void setInfo(ReportInfo info) throws DavException { |
| if (!getType().isRequestedReportType(info)) { |
| throw new DavException(DavServletResponse.SC_BAD_REQUEST, "DAV:version-tree element expected."); |
| } |
| this.info = info; |
| } |
| |
| /** |
| * Runs the DAV:version-tree report. |
| * |
| * @return Xml <code>Document</code> representing the report in the required |
| * format. |
| * @see org.apache.jackrabbit.webdav.xml.XmlSerializable#toXml(Document) |
| * @param document |
| */ |
| public Element toXml(Document document) { |
| return getMultiStatus().toXml(document); |
| } |
| |
| /** |
| * Retrieve the <code>MultiStatus</code> that is returned in response to a locate-by-history |
| * report request. |
| * |
| * @return |
| * @throws NullPointerException if info or resource is <code>null</code>. |
| */ |
| private MultiStatus getMultiStatus() { |
| if (info == null || resource == null) { |
| throw new NullPointerException("Error while running DAV:version-tree report"); |
| } |
| |
| MultiStatus ms = new MultiStatus(); |
| buildResponse(resource, info.getPropertyNameSet(), info.getDepth(), ms); |
| return ms; |
| } |
| |
| /** |
| * |
| * @param res |
| * @param propNameSet |
| * @param depth |
| * @param ms |
| */ |
| private void buildResponse(DavResource res, DavPropertyNameSet propNameSet, |
| int depth, MultiStatus ms) { |
| try { |
| VersionResource[] versions = getVersions(res); |
| for (int i = 0; i < versions.length; i++) { |
| if (propNameSet.isEmpty()) { |
| ms.addResourceStatus(versions[i], DavServletResponse.SC_OK, 0); |
| } else { |
| ms.addResourceProperties(versions[i], propNameSet, 0); |
| } |
| } |
| } catch (DavException e) { |
| log.error(e); |
| } |
| if (depth > 0) { |
| DavResourceIterator it = res.getMembers(); |
| while (it.hasNext()) { |
| buildResponse(it.nextResource(), propNameSet, depth-1, ms); |
| } |
| } |
| } |
| |
| /** |
| * Retrieve all versions from the version history associated with the given |
| * resource. If the versions cannot be retrieved from the given resource |
| * an exception is thrown. |
| * |
| * @param res |
| * @return array of {@link VersionResource}s or an empty array if the versions |
| * could not be retrieved. |
| * @throws DavException if the version history could not be retrieved from |
| * the given resource or if an error occurs while accessing the versions |
| * from the version history resource. |
| */ |
| private static VersionResource[] getVersions(DavResource res) throws DavException { |
| VersionResource[] versions = new VersionResource[0]; |
| if (res instanceof VersionControlledResource) { |
| versions = ((VersionControlledResource)res).getVersionHistory().getVersions(); |
| } else if (res instanceof VersionResource) { |
| versions = ((VersionResource)res).getVersionHistory().getVersions(); |
| } |
| return versions; |
| } |
| } |