1 files changed, 78 insertions, 0 deletions
diff --git a/libraries/launcher/org/polymc/utils/Parameters.java b/libraries/launcher/org/polymc/utils/Parameters.java
new file mode 100644
index 00000000..864d3cd2
--- /dev/null
+++ b/libraries/launcher/org/polymc/utils/Parameters.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2012-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.polymc.utils;
+
+import org.polymc.exception.ParameterNotFoundException;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public final class Parameters {
+
+    private final Map<String, List<String>> paramsMap = new HashMap<>();
+
+    public void add(String key, String value) {
+        List<String> params = paramsMap.get(key);
+
+        if (params == null) {
+            params = new ArrayList<>();
+
+            paramsMap.put(key, params);
+        }
+
+        params.add(value);
+    }
+
+    public List<String> all(String key) throws ParameterNotFoundException {
+        List<String> params = paramsMap.get(key);
+
+        if (params == null)
+            throw new ParameterNotFoundException(key);
+
+        return params;
+    }
+
+    public List<String> allSafe(String key, List<String> def) {
+        List<String> params = paramsMap.get(key);
+
+        if (params == null || params.isEmpty())
+            return def;
+
+        return params;
+    }
+
+    public String first(String key) throws ParameterNotFoundException {
+        List<String> list = all(key);
+
+        if (list.isEmpty())
+            throw new ParameterNotFoundException(key);
+
+        return list.get(0);
+    }
+
+    public String firstSafe(String key, String def) {
+        List<String> params = paramsMap.get(key);
+
+        if (params == null || params.isEmpty())
+            return def;
+
+        return params.get(0);
+    }
+
+}