/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.jackrabbit.webdav.DavConstants;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceIterator;
import org.apache.jackrabbit.webdav.DavServletResponse;
import org.apache.jackrabbit.webdav.MultiStatus;
import org.apache.jackrabbit.webdav.property.DavPropertyNameSet;
import org.apache.jackrabbit.webdav.version.DeltaVConstants;
import org.apache.jackrabbit.webdav.version.VersionControlledResource;
import org.apache.jackrabbit.webdav.version.VersionHistoryResource;
import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.apache.jackrabbit.webdav.xml.ElementIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import java.util.HashSet;
/**
* <code>LocateByHistoryReport</code> encapsulates the DAV:locate-by-hisotry
* report, that may be used to locate a version-controlled resource for that
* version history. The DAV:locate-by-history report can be applied to a collection
* to locate the collection member that is a version-controlled resource for a
* specified version history resource.
*
* <pre>
* <!ELEMENT locate-by-history (version-history-set, prop)>
* <!ELEMENT version-history-set (href+)>
* </pre>
*/
public class LocateByHistoryReport implements Report, DeltaVConstants {
private static Logger log = LoggerFactory.getLogger(LocateByHistoryReport.class);
private ReportInfo info;
private HashSet vhHrefSet = new HashSet();
private DavResource resource;
/**
* Returns {@link ReportType#LOCATE_BY_HISTORY}.
*
* @see Report#getType()
*/
public ReportType getType() {
return ReportType.LOCATE_BY_HISTORY;
}
/**
* @see Report#init(DavResource, ReportInfo)
*/
public void init(DavResource resource, ReportInfo info) throws DavException {
if (resource == null || !(resource instanceof VersionControlledResource)) {
throw new DavException(DavServletResponse.SC_BAD_REQUEST, "DAV:version-tree report can only be created for version-controlled resources and version resources.");
}
this.resource = resource;
setInfo(info);
}
/**
* Set the <code>ReportInfo</code>
*
* @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 (info == null || !getType().isRequestedReportType(info)) {
throw new DavException(DavServletResponse.SC_BAD_REQUEST, "DAV:locate-by-history element expected.");
}
Element versionHistorySet = info.getContentElement(XML_VERSION_HISTORY_SET, NAMESPACE);
if (versionHistorySet == null) {
throw new DavException(DavServletResponse.SC_BAD_REQUEST, "The DAV:locate-by-history element must contain a DAV:version-history-set child.");
}
ElementIterator it = DomUtil.getChildren(versionHistorySet, DavConstants.XML_HREF, DavConstants.NAMESPACE);
while (it.hasNext()) {
String href = DomUtil.getText(it.nextElement());
if (href != null) {
vhHrefSet.add(href);
}
}
this.info = info;
}
/**
* Always returns <code>true</code>.
*
* @return true
* @see org.apache.jackrabbit.webdav.version.report.Report#isMultiStatusReport()
*/
public boolean isMultiStatusReport() {
return true;
}
/**
* Run the 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() {
MultiStatus ms = new MultiStatus();
buildResponse(resource, info.getPropertyNameSet(), info.getDepth(), ms);
return ms;
}
/**
* Fill the <code>MultiStatus</code> with the <code>MultiStatusResponses</code>
* generated for the specified resource and its members according to the
* depth value.
*
* @param res
* @param propNameSet
* @param depth
* @param ms
*/
private void buildResponse(DavResource res, DavPropertyNameSet propNameSet,
int depth, MultiStatus ms) {
// loop over members first, since this report only list members
DavResourceIterator it = res.getMembers();
while (!vhHrefSet.isEmpty() && it.hasNext()) {
DavResource childRes = it.nextResource();
if (childRes instanceof VersionControlledResource) {
try {
VersionHistoryResource vhr = ((VersionControlledResource)childRes).getVersionHistory();
if (vhHrefSet.remove(vhr.getHref())) {
if (propNameSet.isEmpty()) {
ms.addResourceStatus(childRes, DavServletResponse.SC_OK, 0);
} else {
ms.addResourceProperties(childRes, propNameSet, 0);
}
}
} catch (DavException e) {
log.info(e.getMessage());
}
}
// traverse subtree
if (depth > 0) {
buildResponse(it.nextResource(), propNameSet, depth-1, ms);
}
}
}
}