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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
package com.sun.star.report.pentaho;
import java.io.IOException;
import com.sun.star.report.OutputRepository;
public class DefaultNameGenerator
{
private final OutputRepository outputRepository;
public DefaultNameGenerator(final OutputRepository outputRepository)
{
if (outputRepository == null)
{
throw new NullPointerException();
}
this.outputRepository = outputRepository;
}
public String generateName(final String namePrefix, final String mimeType)
throws IOException
{
return generateName(namePrefix, mimeType, true);
}
public String generateStorageName(final String namePrefix, final String mimeType)
throws IOException
{
return generateName(namePrefix, mimeType, false);
}
/**
* Generates a new, unique name for storing resources in the output repository. Assuming that proper synchronization
* has been applied, the generated name will be unique within that repository.
*
* @param namePrefix a user defined name for that resource.
* @param mimeType the mime type of the resource to be stored in the repository.
* @param isStream
* @return the generated, fully qualified name.
* @throws java.io.IOException
*/
private String generateName(final String namePrefix, final String mimeType, final boolean isStream)
throws IOException
{
final String name;
if (namePrefix != null)
{
name = namePrefix;
}
else
{
name = "file";
}
StringBuffer firstFileName = new StringBuffer();
firstFileName.append(name);
final String suffix;
if (mimeType != null)
{
suffix = getSuffixForType(mimeType);
firstFileName.append('.');
firstFileName.append(suffix);
}
else
{
suffix = null;
}
String newName = firstFileName.toString();
boolean exists;
if (isStream)
{
exists = outputRepository.exists(newName);
}
else
{
exists = outputRepository.existsStorage(newName);
}
if (exists)
{
int counter = 0;
while (exists)
{
if (counter < 0) // wraparound should not happen..
{
throw new IOException();
}
firstFileName.delete(0, firstFileName.length());
firstFileName.append(name);
firstFileName.append(counter);
if (suffix != null)
{
firstFileName.append('.');
firstFileName.append(suffix);
}
newName = firstFileName.toString();
if (isStream)
{
exists = outputRepository.exists(newName);
}
else
{
exists = outputRepository.existsStorage(newName);
}
counter++;
}
}
return newName;
}
protected String getSuffixForType(final String mimeType)
{
if ("image/png".equals(mimeType))
{
return "png";
}
if ("image/jpeg".equals(mimeType))
{
return "jpg";
}
if ("image/gif".equals(mimeType))
{
return "gif";
}
// todo ... use a flexible mapping ...
return "dat";
}
}
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