/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.xml.content;
import org.opencms.file.CmsFile;
import org.opencms.file.CmsObject;
import org.opencms.file.CmsPropertyDefinition;
import org.opencms.file.CmsResource;
import org.opencms.file.types.CmsResourceTypeXmlContent;
import org.opencms.i18n.CmsEncoder;
import org.opencms.loader.CmsLoaderException;
import org.opencms.main.CmsException;
import org.opencms.main.OpenCms;
import org.opencms.xml.CmsXmlContentDefinition;
import org.opencms.xml.CmsXmlEntityResolver;
import org.opencms.xml.CmsXmlException;
import org.opencms.xml.CmsXmlUtils;
import java.io.UnsupportedEncodingException;
import java.util.Locale;
import javax.servlet.ServletRequest;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.xml.sax.EntityResolver;
/**
* Provides factory methods to unmarshal (read) an XML content object.<p>
*
* @since 6.0.0
*/
public final class CmsXmlContentFactory {
/**
* No instances of this class should be created.<p>
*/
private CmsXmlContentFactory() {
// noop
}
/**
* Create a new instance of an XML content based on the given default content,
* hat will have all language nodes of the default content and ensures the presence of the given locale.<p>
*
* The given encoding is used when marshalling the XML again later.<p>
*
* @param cms the current users OpenCms content
* @param locale the locale to generate the default content for
* @param modelUri the absolute path to the XML content file acting as model
*
* @throws CmsException in case the model file is not found or not valid
*
* @return the created XML content
*/
public static CmsXmlContent createDocument(CmsObject cms, Locale locale, String modelUri) throws CmsException {
// create the XML content
CmsXmlContent content = new CmsXmlContent(cms, locale, modelUri);
// call prepare for use content handler and return the result
return content.getContentDefinition().getContentHandler().prepareForUse(cms, content);
}
/**
* Create a new instance of an XML content based on the given content definiton,
* that will have one language node for the given locale all initialized with default values.<p>
*
* The given encoding is used when marshalling the XML again later.<p>
*
* @param cms the current users OpenCms content
* @param locale the locale to generate the default content for
* @param encoding the encoding to use when marshalling the XML content later
* @param contentDefinition the content definiton to create the content for
*
* @return the created XML content
*/
public static CmsXmlContent createDocument(
CmsObject cms,
Locale locale,
String encoding,
CmsXmlContentDefinition contentDefinition) {
// create the XML content
CmsXmlContent content = new CmsXmlContent(cms, locale, encoding, contentDefinition);
// call prepare for use content handler and return the result
return content.getHandler().prepareForUse(cms, content);
}
/**
* Factory method to unmarshal (generate) a XML content instance from a byte array
* that contains XML data.<p>
*
* When unmarshalling, the encoding is read directly from the XML header of the byte array.
* The given encoding is used only when marshalling the XML again later.<p>
*
* <b>Warning:</b><br/>
* This method does not support requested historic versions, it always loads the
* most recent version. Use <code>{@link #unmarshal(CmsObject, CmsResource, ServletRequest)}</code>
* for history support.<p>
*
* @param cms the cms context
* @param xmlData the XML data in a byte array
* @param encoding the encoding to use when marshalling the XML content later
* @param resolver the XML entitiy resolver to use
*
* @return a XML content instance unmarshalled from the byte array
*
* @throws CmsXmlException if something goes wrong
*/
public static CmsXmlContent unmarshal(CmsObject cms, byte[] xmlData, String encoding, EntityResolver resolver)
throws CmsXmlException {
return unmarshal(cms, CmsXmlUtils.unmarshalHelper(xmlData, resolver), encoding, resolver);
}
/**
* Factory method to unmarshal (read) a XML content instance from a OpenCms VFS file
* that contains XML data.<p>
*
* <b>Warning:</b><br/>
* This method does not support requested historic versions, it always loads the
* most recent version. Use <code>{@link #unmarshal(CmsObject, CmsResource, ServletRequest)}</code>
* for history support.<p>
*
* @param cms the current cms object
* @param file the file with the XML data to unmarshal
*
* @return a XML page instance unmarshalled from the provided file
*
* @throws CmsXmlException if something goes wrong
*/
public static CmsXmlContent unmarshal(CmsObject cms, CmsFile file) throws CmsXmlException {
return unmarshal(cms, file, true);
}
/**
* Factory method to unmarshal (read) a XML content instance from a OpenCms VFS file
* that contains XML data, using wither the encoding set
* in the XML file header, or the encoding set in the VFS file property.<p>
*
* If you are not sure about the implications of the encoding issues,
* use {@link #unmarshal(CmsObject, CmsFile)} instead.<p>
*
* <b>Warning:</b><br/>
* This method does not support requested historic versions, it always loads the
* most recent version. Use <code>{@link #unmarshal(CmsObject, CmsResource, ServletRequest)}</code>
* for history support.<p>
*
* @param cms the current cms object
* @param file the file with the XML data to unmarshal
* @param keepEncoding if true, the encoding spefified in the XML header is used,
* otherwise the encoding from the VFS file property is used
*
* @return a XML content instance unmarshalled from the provided file
*
* @throws CmsXmlException if something goes wrong
*/
public static CmsXmlContent unmarshal(CmsObject cms, CmsFile file, boolean keepEncoding) throws CmsXmlException {
byte[] contentBytes = file.getContents();
String filename = cms.getSitePath(file);
String encoding = null;
try {
encoding = cms.readPropertyObject(filename, CmsPropertyDefinition.PROPERTY_CONTENT_ENCODING, true).getValue();
} catch (CmsException e) {
// encoding will be null
}
if (encoding == null) {
encoding = OpenCms.getSystemInfo().getDefaultEncoding();
} else {
encoding = CmsEncoder.lookupEncoding(encoding, null);
if (encoding == null) {
throw new CmsXmlException(Messages.get().container(Messages.ERR_XMLCONTENT_INVALID_ENC_1, filename));
}
}
CmsXmlContent content;
if (contentBytes.length > 0) {
// content is initialized
if (keepEncoding) {
// use the encoding from the content
content = unmarshal(cms, contentBytes, encoding, new CmsXmlEntityResolver(cms));
} else {
// use the encoding from the file property
// this usually only triggered by a save operation
try {
String contentStr = new String(contentBytes, encoding);
content = unmarshal(cms, contentStr, encoding, new CmsXmlEntityResolver(cms));
} catch (UnsupportedEncodingException e) {
// this will not happen since the encodig has already been validated
throw new CmsXmlException(Messages.get().container(Messages.ERR_XMLCONTENT_INVALID_ENC_1, filename));
}
}
} else {
// content is empty
content = new CmsXmlContent(cms, DocumentHelper.createDocument(), encoding, new CmsXmlEntityResolver(cms));
}
// set the file
content.setFile(file);
// call prepare for use content handler and return the result
return content.getHandler().prepareForUse(cms, content);
}
/**
* Factory method to unmarshal (read) a XML content instance from
* a resource, using the request attributes as cache.<p>
*
* @param cms the current OpenCms context object
* @param resource the resource to unmarshal
* @param req the current request
*
* @return the unmarshaled xml content, or null if the given resource was not of type {@link org.opencms.file.types.CmsResourceTypeXmlContent}
*
* @throws CmsException in something goes wrong
* @throws CmsLoaderException if no loader for the given <code>resource</code> type ({@link CmsResource#getTypeId()}) is available
* @throws CmsXmlException if the given <code>resource</code> is not of type xml content
*/
public static CmsXmlContent unmarshal(CmsObject cms, CmsResource resource, ServletRequest req)
throws CmsXmlException, CmsLoaderException, CmsException {
String rootPath = resource.getRootPath();
if (!CmsResourceTypeXmlContent.isXmlContent(resource)) {
// sanity check: resource must be of type XML content
throw new CmsXmlException(Messages.get().container(
Messages.ERR_XMLCONTENT_INVALID_TYPE_1,
cms.getSitePath(resource)));
}
// try to get the requested content from the current request attribute
// this is also necessary for historic versions that have been loaded
CmsXmlContent content = (CmsXmlContent)req.getAttribute(rootPath);
if (content == null) {
// unmarshal XML structure from the file content
content = unmarshal(cms, cms.readFile(resource));
// store the content as request attribute for future read requests
req.setAttribute(rootPath, content);
}
// return the result
return content;
}
/**
* Factory method to unmarshal (generate) a XML content instance from a XML document.<p>
*
* The given encoding is used when marshalling the XML again later.<p>
*
* <b>Warning:</b><br/>
* This method does not support requested historic versions, it always loads the
* most recent version. Use <code>{@link #unmarshal(CmsObject, CmsResource, ServletRequest)}</code>
* for history support.<p>
*
* @param cms the cms context, if <code>null</code> no link validation is performed
* @param document the XML document to generate the XML content from
* @param encoding the encoding to use when marshalling the XML content later
* @param resolver the XML entitiy resolver to use
*
* @return a XML content instance unmarshalled from the String
*/
public static CmsXmlContent unmarshal(CmsObject cms, Document document, String encoding, EntityResolver resolver) {
CmsXmlContent content = new CmsXmlContent(cms, document, encoding, resolver);
// call prepare for use content handler and return the result
return content.getHandler().prepareForUse(cms, content);
}
/**
* Factory method to unmarshal (generate) a XML content instance from a String
* that contains XML data.<p>
*
* The given encoding is used when marshalling the XML again later.<p>
*
* <b>Warning:</b><br/>
* This method does not support requested historic versions, it always loads the
* most recent version. Use <code>{@link #unmarshal(CmsObject, CmsResource, ServletRequest)}</code>
* for history support.<p>
*
* @param cms the cms context, if <code>null</code> no link validation is performed
* @param xmlData the XML data in a String
* @param encoding the encoding to use when marshalling the XML content later
* @param resolver the XML entitiy resolver to use
*
* @return a XML content instance unmarshalled from the String
*
* @throws CmsXmlException if something goes wrong
*/
public static CmsXmlContent unmarshal(CmsObject cms, String xmlData, String encoding, EntityResolver resolver)
throws CmsXmlException {
// create the XML content object from the provided String
return unmarshal(cms, CmsXmlUtils.unmarshalHelper(xmlData, resolver), encoding, resolver);
}
/**
* Factory method to unmarshal (generate) a XML content instance from a String
* that contains XML data.<p>
*
* The given encoding is used when marshalling the XML again later.<p>
*
* Since no {@link CmsObject} is available, no link validation is performed!<p>
*
* <b>Warning:</b><br/>
* This method does not support requested historic versions, it always loads the
* most recent version. Use <code>{@link #unmarshal(CmsObject, CmsResource, ServletRequest)}</code>
* for history support.<p>
*
* @param xmlData the XML data in a String
* @param encoding the encoding to use when marshalling the XML content later
* @param resolver the XML entity resolver to use
*
* @return a XML content instance unmarshalled from the String
*
* @throws CmsXmlException if something goes wrong
*/
public static CmsXmlContent unmarshal(String xmlData, String encoding, EntityResolver resolver)
throws CmsXmlException {
return unmarshal(null, xmlData, encoding, resolver);
}
}