fixed encoding db name in http url

Author: rashtao

src/main/java/com/arangodb/DbName.java

@@ -1,6 +1,7 @@
 package com.arangodb;
 
 import com.arangodb.internal.ArangoRequestParam;
+import com.arangodb.internal.util.EncodeUtils;
 import com.arangodb.util.UnicodeUtils;
 
 import java.util.Objects;
@@ -62,6 +63,13 @@ public String get() {
         return value;
     }
 
+    /**
+     * @return the value encoded for usage in HTTP urls.
+     */
+    public String getEncoded() {
+        return EncodeUtils.encodeURIComponent(value);
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;

src/main/java/com/arangodb/internal/http/HttpConnection.java

@@ -21,6 +21,7 @@
 package com.arangodb.internal.http;
 
 import com.arangodb.ArangoDBException;
+import com.arangodb.DbName;
 import com.arangodb.Protocol;
 import com.arangodb.internal.net.Connection;
 import com.arangodb.internal.net.HostDescription;
@@ -238,10 +239,10 @@ public void close() throws IOException {
     }
 
     private static String buildUrl(final String baseUrl, final Request request) {
-        final StringBuilder sb = new StringBuilder().append(baseUrl);
-        final String database = request.getDbName().get();
-        if (database != null && !database.isEmpty()) {
-            sb.append("/_db/").append(database);
+        StringBuilder sb = new StringBuilder().append(baseUrl);
+        DbName dbName = request.getDbName();
+        if (dbName != null && !dbName.get().isEmpty()) {
+            sb.append("/_db/").append(dbName.getEncoded());
         }
         sb.append(request.getRequest());
         if (!request.getQueryParam().isEmpty()) {