X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fbind%2FBindable.java;h=8f5cc86749efa2060ac98fda91c2bfb6ae308d1a;hb=f09d2abb95f106197aea99c345282c3bf0cd3717;hp=4a10187bf6b720bdbead0042a6eaeba02f82b3da;hpb=c8a17fdd2e149fe5feecd96c71b7f2cab286ab96;p=sbp.git

diff --git a/src/edu/berkeley/sbp/bind/Bindable.java b/src/edu/berkeley/sbp/bind/Bindable.java
index 4a10187..8f5cc86 100644
--- a/src/edu/berkeley/sbp/bind/Bindable.java
+++ b/src/edu/berkeley/sbp/bind/Bindable.java
@@ -22,6 +22,11 @@ public abstract class Bindable implements ToJava {
     public abstract String[]       getArgNames();
     public abstract Class[]        getArgTypes();
 
+    public Binding createBinding() { return new SimpleBinding(); }
+    public Binding createBinding(final int[] map) { return new SimpleBinding(map); }
+    public Binding createBinding(final int[] map, Object prepend) { return new SimpleBinding(map, prepend); }
+
+
     public static Bindable create(Object o) {
         if (o instanceof Class) return new BindableClass((Class)o);
         if (o instanceof Method) return new BindableMethod((Method)o);
@@ -29,6 +34,8 @@ public abstract class Bindable implements ToJava {
         return null;
     }
 
+    // Subclasses //////////////////////////////////////////////////////////////////////////////
+
     private static class BindableMethod extends Bindable {
         private final Method _method;
         public String toString() { return "BindableMethod["+_method+"]"; }
@@ -105,6 +112,8 @@ public abstract class Bindable implements ToJava {
     }
 
 
+    // Helpers //////////////////////////////////////////////////////////////////////////////
+
     private static void appendClassArray(StringBuffer sb, Class[] c) {
         sb.append("new Class[] {");
         for(int i=0; i<c.length; i++) {
@@ -120,4 +129,40 @@ public abstract class Bindable implements ToJava {
         if (!c.isArray()) return c.getName().replace('$','.');
         return makeClass(c.getComponentType())+"[]";
     }
+
+
+    // Creating Bindings //////////////////////////////////////////////////////////////////////////////
+
+    private class SimpleBinding implements Binding, ToJava {
+        private int[] map = null;
+        private Object prepend = null;
+        public SimpleBinding() { }
+        public SimpleBinding(int[] map) { this.map = map; }
+        public SimpleBinding(int[] map, Object prepend) { this.map = map; this.prepend = prepend; }
+
+        public Object invoke(Object[] o) {
+            if (map==null) return impose(o);
+            int max = 0;
+            for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
+            Object[] o2 = new Object[max+1];
+            for(int i=0; i<o.length; i++) o2[map[i]+(prepend==null?0:1)] = o[i];
+            if (prepend != null) o2[0] = prepend;
+            return impose(o2);
+        }
+
+        public void toJava(StringBuffer sb) {
+            Bindable.this.toJava(sb);
+            sb.append(".createBinding(");
+            if (map != null) {
+                sb.append("new int[] {");
+                for(int i=0; i<map.length; i++) {
+                    sb.append(i);
+                    if (i<map.length-1) sb.append(",");
+                }
+                sb.append("}");
+            }
+            sb.append(")");
+        }
+    }
+
 }