/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.extensions.datasources.mondrian;
import java.io.File;
import java.io.IOException;
import mondrian.olap.Util;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemManager;
import org.apache.commons.vfs.VFS;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;
/**
* This class emulates Mondrian's schema resolving and allows us to find a string that correctly represents
* a valid VFS path for use in mondrian.
*
* @author Thomas Morgner.
*/
public class SchemaResolver
{
private static final Log logger = LogFactory.getLog(SchemaResolver.class);
private SchemaResolver()
{
}
public static String resolveSchema(final ResourceManager resourceManager,
final ResourceKey contextKey,
String catalogUrl)
throws FileSystemException
{
final FileSystemManager fsManager = VFS.getManager();
if (fsManager == null)
{
throw Util.newError("Cannot get virtual file system manager");
}
// Workaround VFS bug.
if (catalogUrl.startsWith("file://localhost"))
{
catalogUrl = catalogUrl.substring("file://localhost".length());
}
if (catalogUrl.startsWith("file:"))
{
catalogUrl = catalogUrl.substring("file:".length());
}
try
{
final File catalogFile = new File(catalogUrl).getCanonicalFile();
final FileObject file = fsManager.toFileObject(catalogFile);
if (file.isReadable())
{
return catalogFile.getPath();
}
}
catch (FileSystemException fse)
{
logger.info("Failed to resolve schema file '" + catalogUrl + "' as local file. Treating file as non-readable.", fse);
}
catch (IOException e)
{
logger.info("Failed to resolve schema file '" + catalogUrl + "' as local file. Treating file as non-readable.", e);
}
if (contextKey == null)
{
return catalogUrl;
}
final File contextAsFile = getContextAsFile(contextKey);
if (contextAsFile == null)
{
return catalogUrl;
}
final File resolvedFile = new File(contextAsFile.getParentFile(), catalogUrl);
if (resolvedFile.isFile() && resolvedFile.canRead())
{
return resolvedFile.getAbsolutePath();
}
return catalogUrl;
}
private static File getContextAsFile(ResourceKey key)
{
while (key != null)
{
final Object identifier = key.getIdentifier();
if (identifier instanceof File)
{
return (File) identifier;
}
key = key.getParent();
}
return null;
}
}