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1 files changed, 44 insertions, 0 deletions

diff --git a/component/src/main/java/com/yahoo/component/SpecSplitter.java b/component/src/main/java/com/yahoo/component/SpecSplitter.java
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+++ b/component/src/main/java/com/yahoo/component/SpecSplitter.java
@@ -0,0 +1,44 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.component;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Splits and component id or component specification string
+ * into their constituent parts.
+ * @author tonytv
+ */
+class SpecSplitter {
+    final String name;
+    final String version;
+    final ComponentId namespace;
+
+    SpecSplitter(String spec) {
+        List<String> idAndNamespace = splitFirst(spec, '@');
+        List<String> nameAndVersion = splitFirst(idAndNamespace.get(0), ':');
+
+        name = nameAndVersion.get(0);
+        version = second(nameAndVersion);
+        namespace = ComponentId.fromString(second(idAndNamespace));
+    }
+
+    private String second(List<String> components) {
+        return components.size() == 2?
+                components.get(1) :
+                null;
+    }
+
+    private static List<String> splitFirst(String string, char c) {
+        int index = string.indexOf(c);
+        if (index != -1) {
+            if (index == string.length() - 1) {
+                throw new RuntimeException("Expected characters after '" + c + "'");
+            }
+            return Arrays.asList(string.substring(0, index),
+                    string.substring(index + 1));
+        } else {
+            return Arrays.asList(string, null);
+        }
+    }
+}