org.apache.jackrabbit.webdav.jcr.DefaultItemResource Maven / Gradle / Ivy
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/*
* 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.jcr;
import org.apache.jackrabbit.commons.xml.SerializingContentHandler;
import org.apache.jackrabbit.server.io.IOUtil;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavResource;
import org.apache.jackrabbit.webdav.DavResourceFactory;
import org.apache.jackrabbit.webdav.DavResourceIterator;
import org.apache.jackrabbit.webdav.DavResourceIteratorImpl;
import org.apache.jackrabbit.webdav.DavResourceLocator;
import org.apache.jackrabbit.webdav.DavServletResponse;
import org.apache.jackrabbit.webdav.MultiStatusResponse;
import org.apache.jackrabbit.webdav.io.InputContext;
import org.apache.jackrabbit.webdav.io.OutputContext;
import org.apache.jackrabbit.webdav.jcr.property.LengthsProperty;
import org.apache.jackrabbit.webdav.jcr.property.ValuesProperty;
import org.apache.jackrabbit.webdav.lock.ActiveLock;
import org.apache.jackrabbit.webdav.lock.Scope;
import org.apache.jackrabbit.webdav.lock.Type;
import org.apache.jackrabbit.webdav.property.DavProperty;
import org.apache.jackrabbit.webdav.property.DavPropertyName;
import org.apache.jackrabbit.webdav.property.DefaultDavProperty;
import org.apache.jackrabbit.webdav.property.PropEntry;
import org.apache.jackrabbit.webdav.xml.DomUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import javax.jcr.Binary;
import javax.jcr.Item;
import javax.jcr.Property;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import javax.jcr.ValueFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXResult;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Date;
import java.util.List;
/**
* DefaultItemResource represents JCR property item.
*
* @see Property
*/
public class DefaultItemResource extends AbstractItemResource {
private static Logger log = LoggerFactory.getLogger(DefaultItemResource.class);
/**
* Create a new DefaultItemResource.
*
* @param locator
* @param session
*/
public DefaultItemResource(DavResourceLocator locator, JcrDavSession session,
DavResourceFactory factory, Item item) {
super(locator, session, factory, item);
}
//----------------------------------------------< DavResource interface >---
/**
* Returns false.
*
* @return false
* @see DavResource#isCollection()
*/
public boolean isCollection() {
return false;
}
/**
* Always returns 'now'
*
* @return
* @see DavResource#getModificationTime()
*/
public long getModificationTime() {
return new Date().getTime();
}
/**
* In case an underlying repository {@link Property property} exists the following
* logic is applyed to spool the property content:
*
* - Property is not multi valued: Return the {@link javax.jcr.Value#getStream()
* stream representation} of the property value.
* - Property is multivalue: Return the xml representation of the values.
*
*
* @param outputContext
* @see DavResource#spool(OutputContext)
*/
@Override
public void spool(OutputContext outputContext) throws IOException {
// write properties
super.spool(outputContext);
// spool content
OutputStream out = outputContext.getOutputStream();
if (out != null && exists()) {
if (isMultiple()) {
spoolMultiValued(out);
} else {
spoolSingleValued(out);
}
}
}
private void spoolMultiValued(OutputStream out) {
try {
Document doc = DomUtil.createDocument();
doc.appendChild(getProperty(JCR_VALUES).toXml(doc));
ContentHandler handler =
SerializingContentHandler.getSerializer(out);
Transformer transformer =
TransformerFactory.newInstance().newTransformer();
transformer.transform(
new DOMSource(doc), new SAXResult(handler));
} catch (SAXException e) {
log.error("Failed to set up XML serializer for " + item, e);
} catch (TransformerConfigurationException e) {
log.error("Failed to set up XML transformer for " + item, e);
} catch (ParserConfigurationException e) {
log.error("Failed to set up XML document for " + item, e);
} catch (TransformerException e) {
log.error("Failed to serialize the values of " + item, e);
}
}
private void spoolSingleValued(OutputStream out) throws IOException {
try {
Binary binary = ((Property) item).getBinary();
try {
InputStream in = binary.getStream();
try {
IOUtil.spool(in, out);
} finally {
in.close();
}
} finally {
binary.dispose();
}
} catch (RepositoryException e) {
log.error("Cannot obtain stream from " + item, e);
}
}
/**
* Sets the given property. Note, that {@link #JCR_VALUE} and {@link #JCR_VALUES}
* are the only resource properties that are allowed to be modified. Any other
* property is read-only and will throw an exception ('Conflict').
*
* @param property
* @throws DavException
* @see DavResource#setProperty(org.apache.jackrabbit.webdav.property.DavProperty)
*/
@Override
public void setProperty(DavProperty property) throws DavException {
internalSetProperty(property);
complete();
}
/**
* Internal method that performs the setting or adding of properties
*
* @param property
* @throws DavException
* @see #setProperty(DavProperty)
* @see #alterProperties(List)
*/
private void internalSetProperty(DavProperty property) throws DavException {
if (!exists()) {
throw new DavException(DavServletResponse.SC_NOT_FOUND);
}
try {
Property prop = (Property) item;
int defaultType = prop.getType();
ValueFactory vfact = getRepositorySession().getValueFactory();
ValuesProperty vp = new ValuesProperty(property, defaultType, vfact);
if (property.getName().equals(JCR_VALUE)) {
prop.setValue(vp.getJcrValue(vp.getValueType(), vfact));
} else if (property.getName().equals(JCR_VALUES)) {
prop.setValue(vp.getJcrValues());
} else {
throw new DavException(DavServletResponse.SC_CONFLICT);
}
} catch (RepositoryException e) {
throw new JcrDavException(e);
}
}
/**
* Removing properties is not allowed, for a single-value JCR-property without
* a value does not exist. For multivalue properties an empty {@link Value values array}
* may be specified with by setting the {@link #JCR_VALUES 'values' webdav property}.
*
* @param propertyName
* @throws DavException
* @see org.apache.jackrabbit.webdav.DavResource#removeProperty(org.apache.jackrabbit.webdav.property.DavPropertyName)
*/
@Override
public void removeProperty(DavPropertyName propertyName) throws DavException {
if (!exists()) {
throw new DavException(DavServletResponse.SC_NOT_FOUND);
}
throw new DavException(DavServletResponse.SC_FORBIDDEN);
}
/**
* Loops over the given List and alters the properties accordingly.
* Changes are persisted at the end only according to the rules defined with
* the {@link #complete()} method.
* Please note: since there is only a single property than can be set
* from a client (i.e. jcr:value OR jcr:values) this method either succeeds
* or throws an exception, even if this violates RFC 2518.
*
* @param changeList
* @throws DavException
* @see DavResource#alterProperties(List)
*/
@Override
public MultiStatusResponse alterProperties(List changeList) throws DavException {
for (PropEntry propEntry : changeList) {
if (propEntry instanceof DavPropertyName) {
// altering any properties fails if an attempt is made to remove
// a property
throw new DavException(DavServletResponse.SC_FORBIDDEN);
} else if (propEntry instanceof DavProperty) {
DavProperty prop = (DavProperty) propEntry;
internalSetProperty(prop);
} else {
throw new IllegalArgumentException("unknown object in change list: " + propEntry.getClass().getName());
}
}
complete();
return new MultiStatusResponse(getHref(), DavServletResponse.SC_OK);
}
/**
* Method is not allowed.
*
* @see org.apache.jackrabbit.webdav.DavResource#addMember(org.apache.jackrabbit.webdav.DavResource, InputContext)
*/
public void addMember(DavResource resource, InputContext inputContext) throws DavException {
throw new DavException(DavServletResponse.SC_METHOD_NOT_ALLOWED, "Cannot add members to a non-collection resource");
}
/**
* Always returns an empty iterator for a non-collection resource might
* not have internal members.
*
* @return an empty iterator
* @see DavResource#getMembers()
*/
public DavResourceIterator getMembers() {
log.warn("A non-collection resource never has internal members.");
List drl = Collections.emptyList();
return new DavResourceIteratorImpl(drl);
}
/**
* Method is not allowed.
*
* @see DavResource#removeMember(DavResource)
*/
public void removeMember(DavResource member) throws DavException {
throw new DavException(DavServletResponse.SC_METHOD_NOT_ALLOWED, "Cannot remove members from a non-collection resource");
}
/**
* {@link javax.jcr.Property JCR properties} are locked if their
* parent node is locked; thus this method will always return the
* {@link ActiveLock lock} object from the collection this resource is
* internal member of.
*
* @param type
* @param scope
* @return lock present on this resource or null if this resource
* has no lock.
* @see DavResource#getLock(Type, Scope)
*/
@Override
public ActiveLock getLock(Type type, Scope scope) {
if (Type.WRITE.equals(type)) {
return getCollection().getLock(type, scope);
} else {
return super.getLock(type, scope);
}
}
//--------------------------------------------------------------------------
/**
* Add resource specific properties.
*/
@Override
protected void initProperties() {
super.initProperties();
if (exists()) {
try {
Property prop = (Property)item;
int type = prop.getType();
// set the content type
String contentType;
if (isMultiple()) {
contentType = IOUtil.buildContentType("text/xml","utf-8");
} else {
contentType = IOUtil.buildContentType(JcrValueType.contentTypeFromType(type), "utf-8");
}
properties.add(new DefaultDavProperty(DavPropertyName.GETCONTENTTYPE, contentType));
// add jcr-specific resource properties
properties.add(new DefaultDavProperty(JCR_TYPE, PropertyType.nameFromValue(type)));
if (isMultiple()) {
properties.add(new ValuesProperty(prop.getValues()));
properties.add(new LengthsProperty(prop.getLengths()));
} else {
properties.add(new ValuesProperty(prop.getValue()));
long length = prop.getLength();
properties.add(new DefaultDavProperty(JCR_LENGTH, String.valueOf(length), true));
}
} catch (RepositoryException e) {
log.error("Failed to retrieve resource properties: "+e.getMessage());
}
}
}
/**
* Returns true if the JCR Property represented by this resource is a multi
* value property. Note: if this resource does not exist or if the definition
* could not be retrieved false is returned.
*
* @return true if the underlying resource is a multi value property.
*/
private boolean isMultiple() {
try {
if (exists() && ((Property)item).isMultiple()) {
return true;
}
} catch (RepositoryException e) {
log.error("Error while retrieving property definition: " + e.getMessage());
}
return false;
}
}