checkpoint

[sbp.git] / src / edu / berkeley / sbp / bind / Bindable.java

diff --git a/src/edu/berkeley/sbp/bind/Bindable.java b/src/edu/berkeley/sbp/bind/Bindable.java
new file mode 100644 (file)
index 0000000..9e5564e
--- /dev/null
+++ b/src/edu/berkeley/sbp/bind/Bindable.java
@@ -0,0 +1,76 @@
+package edu.berkeley.sbp.bind;
+
+import edu.berkeley.sbp.util.*;
+import edu.berkeley.sbp.*;
+import edu.berkeley.sbp.chr.*;
+import edu.berkeley.sbp.bind.*;
+import java.util.*;
+import java.lang.annotation.*;
+import java.lang.reflect.*;
+import java.io.*;
+import static edu.berkeley.sbp.util.Reflection.*;
+
+public abstract class Bindable {
+
+    public abstract String getSimpleName();
+    public abstract String toString();
+    public abstract <A extends Annotation> A getAnnotation(Class<A> c);
+    public abstract Object impose(Object[] fields);
+    public boolean isAnnotationPresent(Class<? extends Annotation> c) { return getAnnotation(c) != null; }
+
+    public abstract Annotation[][] getArgAnnotations();
+    public abstract String[]       getArgNames();
+
+    public static Bindable create(Object o) {
+        if (o instanceof Class) return new BindableClass((Class)o);
+        if (o instanceof Method) return new BindableMethod((Method)o);
+        if (o instanceof Constructor) return new BindableConstructor((Constructor)o);
+        return null;
+    }
+
+    private static class BindableMethod extends Bindable {
+        private final Method _method;
+        public String toString() { return "BindableMethod["+_method+"]"; }
+        public BindableMethod(Method _method) { this._method = _method; }
+        public String getSimpleName() { return _method.getName(); }
+        public <A extends Annotation> A getAnnotation(Class<A> c) { return _method.getAnnotation(c); }
+        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]; }
+    }
+
+    private static class BindableConstructor extends Bindable {
+        private final Constructor _constructor;
+        public String toString() { return "BindableConstructor["+_constructor+"]"; }
+        public BindableConstructor(Constructor _constructor) { this._constructor = _constructor; }
+        public String getSimpleName() { return _constructor.getName(); }
+        public <A extends Annotation> A getAnnotation(Class<A> c) { return _constructor.getAnnotation(c); }
+        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]; }
+    }
+
+    private static class BindableClass extends Bindable {
+        private final Class _class;
+        public String toString() { return "BindableClass["+_class+"]"; }
+        public BindableClass(Class _class) { this._class = _class; }
+        public String getSimpleName() { return _class.getSimpleName(); }
+        public <A extends Annotation> A getAnnotation(Class<A> c) { return (A)_class.getAnnotation(c); }
+        public Object impose(Object[] fields) { return Reflection.impose(_class, fields); }
+        public Annotation[][] getArgAnnotations() {
+            Field[] fields = _class.getFields();
+            Annotation[][] ret = new Annotation[fields.length][];
+            for(int i=0; i<fields.length; i++)
+                ret[i] = fields[i].getAnnotations();
+            return ret;
+        }
+        public String[]       getArgNames() {
+            Field[] fields = _class.getFields();
+            String[] ret = new String[fields.length];
+            for(int i=0; i<fields.length; i++)
+                ret[i] = fields[i].getName();
+            return ret;
+        }
+    }
+
+}