/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* Project Info: http://plantuml.sourceforge.net
*
* This file is part of PlantUML.
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PlantUML 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.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package net.sourceforge.plantuml.servlet.utility;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import net.sourceforge.plantuml.code.Transcoder;
import net.sourceforge.plantuml.code.TranscoderUtil;
/**
* Utility class to extract the UML source from the compressed UML source contained in the end part
* of the requested URI.
*/
public class UmlExtractor {
/**
* Build the complete UML source from the compressed source extracted from the HTTP URI.
*
* @param source
* the last part of the URI containing the compressed UML
* @return the textual UML source
*/
static public String getUmlSource(String source) {
// build the UML source from the compressed part of the URL
String text;
try {
text = URLDecoder.decode(source, "UTF-8");
} catch (UnsupportedEncodingException uee) {
text = "' invalid encoded string";
}
Transcoder transcoder = TranscoderUtil.getDefaultTranscoder();
try {
text = transcoder.decode(text);
} catch (IOException ioe) {
text = "' unable to decode string";
}
// encapsulate the UML syntax if necessary
String uml;
if (text.startsWith("@start")) {
uml = text;
} else {
StringBuilder plantUmlSource = new StringBuilder();
plantUmlSource.append("@startuml\n");
plantUmlSource.append(text);
if (text.endsWith("\n") == false) {
plantUmlSource.append("\n");
}
plantUmlSource.append("@enduml");
uml = plantUmlSource.toString();
}
return uml;
}
protected UmlExtractor() {
// prevents calls from subclass
throw new UnsupportedOperationException();
}
}