Added easy way to go from a Backend to a BackendSupport implement…

…ation for that backend (ceylon/ceylon-spec#500)
ceylon · Apr 29, 2015 · 71f608d · 71f608d
1 parent ea7bdf1
commit 71f608d
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Showing 2 changed files with 19 additions and 3 deletions.
diff --git a/src/com/redhat/ceylon/common/Backend.java b/src/com/redhat/ceylon/common/Backend.java
@@ -1,13 +1,15 @@
 package com.redhat.ceylon.common;
 
 public enum Backend {
-    Java("jvm"),
-    JavaScript("js");
+    Java("jvm", BackendSupport.JAVA),
+    JavaScript("js", BackendSupport.JAVASCRIPT);
 
     public final String nativeAnnotation;
+    public final BackendSupport backendSupport;
 
-    Backend(String nativeAnnotation) {
+    Backend(String nativeAnnotation, BackendSupport backendSupport) {
         this.nativeAnnotation = nativeAnnotation;
+        this.backendSupport = backendSupport;
     }
 
     public static boolean validAnnotation(String backend) {

diff --git a/src/com/redhat/ceylon/common/BackendSupport.java b/src/com/redhat/ceylon/common/BackendSupport.java
@@ -2,4 +2,18 @@
 
 public interface BackendSupport {
     boolean supportsBackend(Backend backend);
+
+    public static final BackendSupport JAVA = new BackendSupport() {
+        @Override
+        public boolean supportsBackend(Backend backend) {
+            return backend == Backend.Java;
+        }
+    };
+
+    public static final BackendSupport JAVASCRIPT = new BackendSupport() {
+        @Override
+        public boolean supportsBackend(Backend backend) {
+            return backend == Backend.JavaScript;
+        }
+    };
 }