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be-graphes-model/src/main/java/org/insa/graphs/model/io/BinaryPathWriter.java

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+package org.insa.graphs.model.io;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.util.Arrays;
+
+import org.insa.graphs.model.Arc;
+import org.insa.graphs.model.Path;
+
+/**
+ * Implementation of {@link PathWriter} to write paths in binary format.
+ *
+ */
+public class BinaryPathWriter extends BinaryWriter implements PathWriter {
+
+    /**
+     * Create a new BinaryPathWriter that writes to the given output stream.
+     * 
+     * @param dos Output stream to write to.
+     */
+    public BinaryPathWriter(DataOutputStream dos) {
+        super(dos);
+    }
+
+    @Override
+    public void writePath(Path path) throws IOException {
+
+        // Write magic number and version.
+        dos.writeInt(BinaryPathReader.MAGIC_NUMBER);
+        dos.writeInt(BinaryPathReader.VERSION);
+
+        // Write map id.
+        byte[] bytes = Arrays.copyOf(path.getGraph().getMapId().getBytes("UTF-8"),
+                BinaryGraphReader.MAP_ID_FIELD_LENGTH);
+        dos.write(bytes);
+
+        // Write number of arcs
+        dos.writeInt(path.getArcs().size() + 1);
+
+        // Write origin / destination.
+        dos.writeInt(path.getOrigin().getId());
+        dos.writeInt(path.getDestination().getId());
+
+        // Write nodes.
+        dos.writeInt(path.getOrigin().getId());
+        for (Arc arc: path.getArcs()) {
+            dos.writeInt(arc.getDestination().getId());
+        }
+
+        dos.flush();
+        dos.close();
+    }
+
+}