Save/Load

* enchanted build.gradle
* added test for save/load (still incomplete)
* implemented save/load (still incomplete)

build.gradle

@@ -3,6 +3,19 @@ apply plugin: 'eclipse'
 
 version='1.0-SNAPSHOT'
 
+test {
+    useJUnitPlatform()
+}
+
+sourceSets {
+    main {
+        java {
+            srcDirs "src"
+            srcDirs "test"
+        }
+    }
+}
+
 repositories {
     mavenCentral()
 }
@@ -10,6 +23,6 @@ repositories {
 dependencies {
 	compile group: 'com.google.code.gson', name: 'gson', version: '2.8.5'
 	
-	compile group: 'commons-collections', name: 'commons-collections', version: '3.2'
-    testCompile group: 'junit', name: 'junit', version: '4.+'
+	/*compile group: 'commons-collections', name: 'commons-collections', version: '3.2'*/
+	/*testCompile 'junit:junit:4.4'*/
 }

src/berack96/sim/util/graph/Graph.java

@@ -547,7 +547,6 @@ public interface Graph<V, W extends Number> extends Iterable<V> {
      */
     Map<V, List<Edge<V, W>>> distance(V source) throws NullPointerException, IllegalArgumentException;
 
-    /*
     static void save(Graph<?, ?> graph, String file) throws IOException {
     	Map<String, Object> map = new HashMap<>();
     	map.put("vertices", graph.vertices());
@@ -560,21 +559,27 @@ public interface Graph<V, W extends Number> extends Iterable<V> {
     }
     
     @SuppressWarnings("unchecked")
-    static void load(Graph<Object, Number> graph, String file) throws IOException {
+    static <V, W extends Number> void load(Graph<V, W> graph, String file) throws IOException {
+    	graph.removeAllVertex();
+    	
     	Gson gson = new Gson();
     	FileReader reader = new FileReader(file);
     	StringBuilder fileContent = new StringBuilder();
     	int c;
     	
     	while((c = reader.read()) != -1)
-    		fileContent.append(c);
+    		fileContent.append((char)c);
     	reader.close();
-    	
     	Map<String, Object> map = gson.fromJson(fileContent.toString(), Map.class);
-    	graph.addAllVertices((Collection<Object>)map.get("vertices"));
-    	graph.addAllEdges((Collection<Edge<Object, Number>>)map.get("edges"));
+    	
+    	Collection<V> vertices = (Collection<V>)map.get("vertices");
+		graph.addAllVertices(vertices);
+    	
+    	Collection<Map<String, Object>>collection = (Collection<Map<String, Object>>)map.get("edges");
+    	for (Map<String, Object> edge : collection) {
+    		graph.addEdge((V) edge.get("source"), (V) edge.get("destination"), (W) edge.get("weight"));
+    	}
     }
-    */
     
     // TODO maybe -> STATIC saveOnFile(orString) INSTANCE loadFromFile(orString), but need JSON parser
     // TODO maybe, but i don't think so... STATIC DISTANCE V* -> V*

test/berack96/test/sim/TestGraph.java

@@ -1,5 +1,29 @@
 package berack96.test.sim;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.io.UnsupportedEncodingException;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
 import berack96.sim.util.graph.Edge;
 import berack96.sim.util.graph.Graph;
 import berack96.sim.util.graph.MapGraph;
@@ -7,26 +31,44 @@ import berack96.sim.util.graph.Vertex;
 import berack96.sim.util.graph.visit.BFS;
 import berack96.sim.util.graph.visit.DFS;
 import berack96.sim.util.graph.visit.VisitInfo;
-import org.junit.Before;
-import org.junit.Test;
-
-import java.util.*;
-import java.util.concurrent.atomic.AtomicInteger;
-
-import static org.junit.Assert.*;
 
+@SuppressWarnings("deprecation")
 public class TestGraph {
 
     private Graph<String, Integer> graph;
-
+    
+    private final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+    
+    private final String encoding = "UTF-8";
     private final Exception nullException = new NullPointerException(Graph.PARAM_NULL);
     private final Exception notException = new IllegalArgumentException(Graph.VERTEX_NOT_CONTAINED);
     private final Exception unsuppException = new UnsupportedOperationException(Vertex.REMOVED);
 
+    
     @Before
     public void before() {
         // Change here the instance for changing all the test for that particular class
         graph = new MapGraph<>();
+
+        PrintStream p = null;
+        try {
+			p = new PrintStream(bytes, true, encoding);
+	        System.setErr(p);
+	        System.setOut(p);
+		} catch (UnsupportedEncodingException e) {
+			e.printStackTrace();
+		}
+    }
+    
+    @After
+    public void after() {
+    	try {
+			String printed = bytes.toString(encoding);
+			if (!printed.isEmpty())
+				fail("Remove the printed string in the methods: " + printed);
+		} catch (UnsupportedEncodingException e) {
+			e.printStackTrace();
+		}
     }
 
     @Test
@@ -1270,7 +1312,57 @@ public class TestGraph {
         assertEquals(4, graph.numberOfVertices());
     }
 
-    // TODO test saveFile
+    @Test
+    public void saveLoad() {
+    	/*
+         * This graph should be like this
+         *
+         * 1  ->  2  <-  6      7
+         *               ^      ^
+         * |      |      |      |
+         * v      v
+         * 3  <-  5  ->  4      8
+         */
+
+    	String fileName = "test/resources/test.json";
+    	
+        graph.addVertexIfAbsent("1");
+        graph.addVertexIfAbsent("2");
+        graph.addVertexIfAbsent("3");
+        graph.addVertexIfAbsent("4");
+        graph.addVertexIfAbsent("5");
+        graph.addVertexIfAbsent("6");
+        graph.addVertexIfAbsent("7");
+        graph.addVertexIfAbsent("8");
+
+        graph.addEdge("1", "2", 1);
+        graph.addEdge("1", "3", 1);
+        graph.addEdge("2", "5", 4);
+        graph.addEdge("4", "6", 6);
+        graph.addEdge("5", "3", 2);
+        graph.addEdge("5", "4", 5);
+        graph.addEdge("6", "2", 2);
+        graph.addEdge("8", "7", 9);
+        
+        try {
+			Graph.save(graph, fileName);
+			Graph.load(graph, fileName);
+			graph.removeAllVertex();
+			Graph.load(graph, fileName);
+		} catch (Exception e) {
+			fail(e.getMessage());
+		}
+        
+		graph = null;
+		shouldThrow(new NullPointerException(), () -> { try {
+			Graph.load(graph, fileName);
+		} catch (IOException e) {
+			fail();
+			e.printStackTrace();
+		} });
+    }
+    
+    
 
     private void shouldContain(Collection<?> actual, Object... expected) {
         assertEquals("They have not the same number of elements\nActual: " + actual, expected.length, actual.size());

test/resources/test.json

@@ -0,0 +1 @@
+{"vertices":["1","2","3","4","5","6","7","8"],"edges":[{"source":"1","destination":"2","weight":1},{"source":"1","destination":"3","weight":1},{"source":"5","destination":"4","weight":5},{"source":"6","destination":"2","weight":2},{"source":"5","destination":"3","weight":2},{"source":"8","destination":"7","weight":9},{"source":"4","destination":"6","weight":6},{"source":"2","destination":"5","weight":4}]}