First task, communicate from Graphstream to Gephi through GSON protocol

.gitignore

@@ -8,4 +8,7 @@
 # eclipse #
 .project
 .classpath
-.settings
+.settings
+
+bin/
+target/

src-test/org/graphstream/stream/gephi/test/TestJSONSink.java

@@ -0,0 +1,34 @@
+package org.graphstream.stream.gephi.test;
+
+import org.graphstream.graph.Graph;
+import org.graphstream.graph.implementations.SingleGraph;
+import org.graphstream.stream.gephi.JSONSink;
+
+public class TestJSONSink {
+	public static void main(String args[]) {
+        Graph graph = new SingleGraph("Tutorial 1");
+
+        JSONSink jsonSink = new JSONSink("localhost", 8080, "workspace0");
+		graph.addSink(jsonSink);
+
+		//graph.display();
+
+        graph.addNode("A");
+        graph.addNode("B");
+        graph.addNode("C");
+        sleep();
+        graph.addEdge("AB", "A", "B");
+        graph.addEdge("BC", "B", "C");
+        graph.addEdge("CA", "C", "A");
+        sleep();
+
+
+		graph.clear();
+	}
+
+	protected static void sleep() {
+        try {
+        	Thread.sleep(1000); 
+        } catch (Exception e) {}
+    }
+}

src/org/graphstream/stream/gephi/JSONEventConstants.java

@@ -0,0 +1,48 @@
+/**
+ * 
+ */
+package org.graphstream.stream.gephi;
+
+/**
+ * @author wumalbert
+ *
+ */
+public class JSONEventConstants {
+
+    public enum Types {
+    	AN("an"),
+    	CN("cn"),
+    	DN("dn"),
+    	AE("ae"),
+    	CE("ce"),
+        DE("de"),
+        CG("cg");
+
+        private String value;
+
+        private Types(String value) {
+                this.value = value;
+        }
+
+        public String value() {
+                return value;
+        }
+    }
+
+    public enum Fields {    	
+        ID("id"),
+        T("t"), //timestamp
+        SOURCE("source"),
+        TARGET("target"),
+        DIRECTED("directed");
+        private String value;
+
+        private Fields(String value) {
+            this.value = value;
+        }
+
+        public String value() {
+            return value;
+        }
+    };
+}