change map to properties

src/main/java/org/heigit/ohsome/oshdb/helpers/OSHDBDriver.java

@@ -2,7 +2,7 @@ package org.heigit.ohsome.oshdb.helpers;
 
 import java.sql.Connection;
 import java.sql.DriverManager;
-import java.util.Map;
+import java.util.Properties;
 import java.util.function.Consumer;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -45,7 +45,7 @@ public class OSHDBDriver {
    *  multithreading=true
    * }</pre>
    */
-  public static void connect(Map<String, String> props, Consumer<OSHDBConnection> connect)
+  public static void connect(Properties props, Consumer<OSHDBConnection> connect)
       throws Exception {
     String oshdb = getInterpolated(props, "oshdb");
     if (oshdb == null) {
@@ -133,13 +133,13 @@ public class OSHDBDriver {
 
   private static final Pattern substitute = Pattern.compile("\\$\\{(\\w+)\\}");
 
-  private static String getInterpolated(Map<String, String> props, String key) {
+  private static String getInterpolated(Properties props, String key) {
     return getInterpolated(props, key, null);
   }
 
-  private static String getInterpolated(Map<String, String> props, String key,
+  private static String getInterpolated(Properties props, String key,
       String defaultValue) {
-    String value = props.get(key);
+    String value = props.getProperty(key);
     if (value == null) {
       return defaultValue;
     }
@@ -147,7 +147,7 @@ public class OSHDBDriver {
     StringBuffer sb = new StringBuffer();
     while (matcher.find()) {
       String sub = matcher.group(1);
-      matcher.appendReplacement(sb, props.getOrDefault(sub, "\\${" + sub + "}"));
+      matcher.appendReplacement(sb, props.getProperty(sub, "\\${" + sub + "}"));
     }
     matcher.appendTail(sb);
     return sb.toString();