/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) 1999-2007 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <p>
*/
package org.olat.ims.cp.objects;
import java.util.Iterator;
import java.util.List;
import org.dom4j.tree.DefaultElement;
import org.olat.core.logging.OLATRuntimeException;
import org.olat.core.util.vfs.VFSContainer;
import org.olat.core.util.vfs.VFSItem;
import org.olat.core.util.vfs.VFSLeaf;
import org.olat.core.util.vfs.VFSManager;
import org.olat.core.util.vfs.filters.VFSItemExcludePrefixFilter;
import org.olat.core.util.vfs.filters.VFSItemFilter;
import org.olat.fileresource.FileResourceManager;
import org.olat.ims.cp.CPCore;
/**
*
* Description:<br>
* TThis class represents a file-element of a IMS-manifest-file
*
* <P>
* Initial Date: 01.07.2008 <br>
*
* @author Sergio Trentini
*/
public class CPFile extends DefaultElement implements CPNode {
private String href;
private VFSLeaf file;
private CPMetadata metadata;
private int position;
private CPResource parent;
/**
* Constructor, used when building up the cp (parsing XML-manifest)
*
* @param me
* @param xmlBase xmlBase-attribute of the parental resource-element
* @param packageFolder TODO
*/
public CPFile(DefaultElement me, String xmlBase, VFSContainer rootDir) {
super(me.getName());
setContent(me.content());
this.href = me.attributeValue(CPCore.HREF);
if (xmlBase.equals("")) {
file = (VFSLeaf) rootDir.resolve(href);
} else {
file = (VFSLeaf) rootDir.resolve(xmlBase + "/" + href);
}
}
/**
* this constructor is used when creating a new CPfile
*
* @param href the href-attribute of this element
*/
public CPFile(VFSLeaf file) {
super(CPCore.FILE);
this.href = calculateHref(file);
this.file = file;
}
/**
* @see org.dom4j.tree.DefaultElement#clone()
*/
public Object clone() {
CPFile copy = (CPFile) super.clone();
// Don't copy metadata, since we don't edit them anyway.
// Make a copy of the leaf
// TODO:GW Copy the leaf
VFSContainer parentContainer = file.getParentContainer();
String newName = VFSManager.similarButNonExistingName(parentContainer, file.getName());
VFSLeaf leafCopy = parentContainer.createChildLeaf(newName);
VFSManager.copyContent(file, leafCopy);
copy.setFile(leafCopy);
copy.setHref(calculateHref(leafCopy));
return copy;
}
/**
* @param leaf
* @return The relataive path or href attribute of the leaf
*/
private String calculateHref(VFSLeaf leaf) {
final String slash = "/";
StringBuilder path = new StringBuilder(leaf.getName());
VFSContainer parentContainer = leaf.getParentContainer();
while (parentContainer != null && !FileResourceManager.ZIPDIR.equals(parentContainer.getName())) {
path.insert(0, slash).insert(0, parentContainer.getName());
parentContainer = parentContainer.getParentContainer();
}
return path.toString();
}
/**
*
* @see org.olat.ims.cp.objects.CPNode#buildChildren()
*/
public void buildChildren() {
Iterator<DefaultElement> children = this.elementIterator();
// iterate through children
while (children.hasNext()) {
DefaultElement child = children.next();
if (child.getName().equals(CPCore.METADATA)) {
// TODO: implement METADATA
metadata = new CPMetadata(child);
} else {
throw new OLATRuntimeException(CPOrganizations.class, "Invalid IMS-Manifest ( only <metadata> element under <file> is allowed )",
new Exception());
}
}
this.clearContent();
validateElement();
}
/**
*
* @see org.olat.ims.cp.objects.CPNode#validateElement()
*/
public boolean validateElement() {
if (this.href == null) { throw new OLATRuntimeException(CPOrganizations.class,
"Invalid IMS-Manifest (missing \"href\" attribute in <file> element)", new Exception()); }
return true;
}
/**
*
* @see org.olat.ims.cp.objects.CPNode#getXML(java.lang.StringBuilder)
*/
public void buildDocument(DefaultElement parent) {
DefaultElement fileElement = new DefaultElement(CPCore.FILE);
fileElement.addAttribute(CPCore.HREF, href);
if (metadata != null) {
metadata.buildDocument(fileElement);
}
parent.add(fileElement);
}
/**
* deletes the file from the filesystem
*/
public void deleteFromFS() {
if (file != null) {
VFSContainer parentContainer = file.getParentContainer();
file.delete();
// Delete the parent container if it is empty
deleteIfEmpty(parentContainer);
}
}
/**
* Deletes the container if it is empty (excluding files with '.' prefix).
*
* @param parentContainer
*/
private void deleteIfEmpty(VFSContainer container) {
String[] unwantedPrefixes = { "." };
VFSItemFilter filter = new VFSItemExcludePrefixFilter(unwantedPrefixes);
if (container != null) {
List<VFSItem> items = container.getItems(filter);
if (items == null || items.size() == 0) {
container.delete();
}
}
}
// *** Getters ***
public String getHref() {
return href;
}
public VFSLeaf getFile() {
return file;
}
public String getFilename() {
return file.getName();
}
public int getPosition() {
return position;
}
public DefaultElement getElementByIdentifier(String id) {
// <file>-elements do not have an identifier and do not have children...
return null;
}
public CPResource getParentElement() {
return parent;
}
// *** Setters ***
public void setHref(String href) {
this.href = href;
}
public void setFile(VFSLeaf file) {
this.file = file;
}
public void setPosition(int pos) {
position = pos;
}
public void setParentElement(CPResource parent) {
this.parent = parent;
}
public void setMetadata(CPMetadata md) {
metadata = md;
}
}