1 files changed, 72 insertions, 0 deletions
diff --git a/src/net/sourceforge/plantuml/cucadiagram/dot/GraphvizVersions.java b/src/net/sourceforge/plantuml/cucadiagram/dot/GraphvizVersions.java
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+++ b/src/net/sourceforge/plantuml/cucadiagram/dot/GraphvizVersions.java
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+/* ========================================================================
+ * PlantUML : a free UML diagram generator
+ * ========================================================================
+ *
+ * (C) Copyright 2009-2014, Arnaud Roques
+ *
+ * Project Info:  http://plantuml.sourceforge.net
+ * 
+ * This file is part of PlantUML.
+ *
+ * Licensed under The MIT License (Massachusetts Institute of Technology License)
+ * 
+ * See http://opensource.org/licenses/MIT
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+ * IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ *
+ * Original Author:  Arnaud Roques
+ */
+package net.sourceforge.plantuml.cucadiagram.dot;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class GraphvizVersions {
+
+	private final static GraphvizVersions singleton = new GraphvizVersions();
+
+	private final Map<File, GraphvizVersion> map = new ConcurrentHashMap<File, GraphvizVersion>();
+
+	private GraphvizVersions() {
+	}
+
+	public static GraphvizVersions getInstance() {
+		return singleton;
+	}
+
+	public GraphvizVersion getVersion(File f) {
+		if (f == null) {
+			return null;
+		}
+		GraphvizVersion result = map.get(f);
+		if (result != null) {
+			return result;
+		}
+		result = checkVersionSlow(f.getAbsolutePath());
+		map.put(f, result);
+		return result;
+	}
+
+	static GraphvizVersion checkVersionSlow(String pathExecutable) {
+		final GraphvizVersionFinder finder = new GraphvizVersionFinder(new File(pathExecutable));
+		return finder.getVersion();
+	}
+
+}