X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;ds=sidebyside;f=src%2Fedu%2Fberkeley%2Fsbp%2Fbind%2FBindable.java;h=e3ee82f9615c0148ce6f913d012e27e5f102a3ee;hb=3ee451bce342d4bb61ad6235ba57bdf817bfdd1a;hp=0e2da13b635d23badfa8fa02f03418867fe08b79;hpb=f8dec42308b5eb1196db5bf56bb2f5426b4a76af;p=sbp.git

diff --git a/src/edu/berkeley/sbp/bind/Bindable.java b/src/edu/berkeley/sbp/bind/Bindable.java
index 0e2da13..e3ee82f 100644
--- a/src/edu/berkeley/sbp/bind/Bindable.java
+++ b/src/edu/berkeley/sbp/bind/Bindable.java
@@ -1,3 +1,5 @@
+// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
+
 package edu.berkeley.sbp.bind;
 
 import edu.berkeley.sbp.util.*;
@@ -20,6 +22,12 @@ public abstract class Bindable implements ToJava {
 
     public abstract Annotation[][] getArgAnnotations();
     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);
@@ -28,6 +36,8 @@ 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+"]"; }
@@ -37,6 +47,7 @@ public abstract class Bindable implements ToJava {
         public Object impose(Object[] fields) { return Reflection.impose(_method, fields); }
         public Annotation[][] getArgAnnotations() { return _method.getParameterAnnotations(); }
         public String[]       getArgNames() { return new String[_method.getParameterTypes().length]; }
+        public Class[]        getArgTypes() { return _method.getParameterTypes(); }
         public void toJava(StringBuffer sb) {
             sb.append("Bindable.create(");
             sb.append(_method.getDeclaringClass().getName().replace('$','.'));
@@ -57,6 +68,7 @@ public abstract class Bindable implements ToJava {
         public Object impose(Object[] fields) { return Reflection.impose(_constructor, fields); }
         public Annotation[][] getArgAnnotations() { return _constructor.getParameterAnnotations(); }
         public String[]       getArgNames() { return new String[_constructor.getParameterTypes().length]; }
+        public Class[]        getArgTypes() { return _constructor.getParameterTypes(); }
         public void toJava(StringBuffer sb) {
             sb.append("Bindable.create(");
             sb.append(_constructor.getDeclaringClass().getName().replace('$','.'));
@@ -87,6 +99,13 @@ public abstract class Bindable implements ToJava {
                 ret[i] = fields[i].getName();
             return ret;
         }
+        public Class[]       getArgTypes() {
+            Field[] fields = _class.getFields();
+            Class[] ret = new Class[fields.length];
+            for(int i=0; i<fields.length; i++)
+                ret[i] = fields[i].getType();
+            return ret;
+        }
         public void toJava(StringBuffer sb) {
             sb.append("Bindable.create(");
             sb.append(_class.getName().replace('$','.'));
@@ -95,6 +114,8 @@ 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++) {
@@ -110,4 +131,40 @@ 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(")");
+        }
+    }
+
 }