From 894153349df179c7495471c7d6de98688816401d Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Tue, 19 Oct 2021 18:45:27 +0300
Subject: [PATCH] possibility to specify default value

---
 .../parameter/StringParameter.java              | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/main/java/eu/svjatoslav/commons/commandline/parameterparser/parameter/StringParameter.java b/src/main/java/eu/svjatoslav/commons/commandline/parameterparser/parameter/StringParameter.java
index fee7adb..7a72cf3 100755
--- a/src/main/java/eu/svjatoslav/commons/commandline/parameterparser/parameter/StringParameter.java
+++ b/src/main/java/eu/svjatoslav/commons/commandline/parameterparser/parameter/StringParameter.java
@@ -9,8 +9,16 @@ import eu.svjatoslav.commons.commandline.parameterparser.Parameter;
 
 public class StringParameter extends Parameter<String, StringParameter> {
 
+    public final String defaultValue;
+
     public StringParameter(final String description) {
         super(description, ArgumentCount.SINGLE);
+        defaultValue = null;
+    }
+    public StringParameter(final String description, String defaultValue) {
+        super(description, ArgumentCount.SINGLE);
+        this.defaultValue = defaultValue;
+        this.setSpecified(true);
     }
 
     @Override
@@ -21,11 +29,12 @@ public class StringParameter extends Parameter<String, StringParameter> {
     @Override
     public String getValue() {
 
-        if (arguments.size() != 1)
-            throw new RuntimeException("Parameter " + description
-                    + " shall have exactly 1 argument.");
+        if (arguments.isEmpty() && (defaultValue != null)) return defaultValue;
+
+        if (arguments.size() == 1) return arguments.get(0);
 
-        return arguments.get(0);
+        throw new RuntimeException("Parameter " + description
+                + " shall have exactly 1 argument.");
     }
 
     @Override
-- 
2.20.1