92 lines
3.0 KiB
Java
92 lines
3.0 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* Project Info: https://plantuml.com
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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package net.sourceforge.plantuml.servlet.utility;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.net.URLDecoder;
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import net.sourceforge.plantuml.OptionFlags;
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import net.sourceforge.plantuml.code.Transcoder;
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import net.sourceforge.plantuml.code.TranscoderUtil;
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/**
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* Utility class to extract the UML source from the compressed UML source contained in the end part
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* of the requested URI.
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*/
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public class UmlExtractor {
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static {
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OptionFlags.ALLOW_INCLUDE = false;
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if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
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OptionFlags.ALLOW_INCLUDE = true;
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}
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}
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/**
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* Build the complete UML source from the compressed source extracted from the
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* HTTP URI.
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*
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* @param source the last part of the URI containing the compressed UML
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* @return the textual UML source
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*/
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static public String getUmlSource(String source) {
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// build the UML source from the compressed part of the URL
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String text;
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try {
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text = URLDecoder.decode(source, "UTF-8");
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} catch (UnsupportedEncodingException uee) {
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text = "' invalid encoded string";
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}
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Transcoder transcoder = TranscoderUtil.getDefaultTranscoder();
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try {
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text = transcoder.decode(text);
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} catch (IOException ioe) {
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text = "' unable to decode string";
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}
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// encapsulate the UML syntax if necessary
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String uml;
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if (text.startsWith("@start")) {
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uml = text;
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} else {
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StringBuilder plantUmlSource = new StringBuilder();
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plantUmlSource.append("@startuml\n");
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plantUmlSource.append(text);
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if (text.endsWith("\n") == false) {
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plantUmlSource.append("\n");
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}
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plantUmlSource.append("@enduml");
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uml = plantUmlSource.toString();
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}
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return uml;
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}
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protected UmlExtractor() {
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// prevents calls from subclass
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throw new UnsupportedOperationException();
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}
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}
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