src/edu/berkeley/sbp/bind/Bindable.java

   1 package edu.berkeley.sbp.bind;
   2
   3 import edu.berkeley.sbp.util.*;
   4 import edu.berkeley.sbp.*;
   5 import edu.berkeley.sbp.chr.*;
   6 import edu.berkeley.sbp.bind.*;
   7 import java.util.*;
   8 import java.lang.annotation.*;
   9 import java.lang.reflect.*;
  10 import java.io.*;
  11 import static edu.berkeley.sbp.util.Reflection.*;
  12
  13 public abstract class Bindable implements ToJava {
  14
  15     public abstract String getSimpleName();
  16     public abstract String toString();
  17     public abstract <A extends Annotation> A getAnnotation(Class<A> c);
  18     public abstract Object impose(Object[] fields);
  19     public boolean isAnnotationPresent(Class<? extends Annotation> c) { return getAnnotation(c) != null; }
  20
  21     public abstract Annotation[][] getArgAnnotations();
  22     public abstract String[]       getArgNames();
  23     public abstract Class[]        getArgTypes();
  24
  25     public Binding createBinding() { return new SimpleBinding(); }
  26     public Binding createBinding(final int[] map) { return new SimpleBinding(map); }
  27     public Binding createBinding(final int[] map, Object prepend) { return new SimpleBinding(map, prepend); }
  28
  29
  30     public static Bindable create(Object o) {
  31         if (o instanceof Class) return new BindableClass((Class)o);
  32         if (o instanceof Method) return new BindableMethod((Method)o);
  33         if (o instanceof Constructor) return new BindableConstructor((Constructor)o);
  34         return null;
  35     }
  36
  37     // Subclasses //////////////////////////////////////////////////////////////////////////////
  38
  39     private static class BindableMethod extends Bindable {
  40         private final Method _method;
  41         public String toString() { return "BindableMethod["+_method+"]"; }
  42         public BindableMethod(Method _method) { this._method = _method; }
  43         public String getSimpleName() { return _method.getName(); }
  44         public <A extends Annotation> A getAnnotation(Class<A> c) { return _method.getAnnotation(c); }
  45         public Object impose(Object[] fields) { return Reflection.impose(_method, fields); }
  46         public Annotation[][] getArgAnnotations() { return _method.getParameterAnnotations(); }
  47         public String[]       getArgNames() { return new String[_method.getParameterTypes().length]; }
  48         public Class[]        getArgTypes() { return _method.getParameterTypes(); }
  49         public void toJava(StringBuffer sb) {
  50             sb.append("Bindable.create(");
  51             sb.append(_method.getDeclaringClass().getName().replace('$','.'));
  52             sb.append(".class.getMethod(\"");
  53             sb.append(_method.getName());
  54             sb.append("\", ");
  55             appendClassArray(sb, _method.getParameterTypes());
  56             sb.append("))");
  57         }
  58     }
  59
  60     private static class BindableConstructor extends Bindable {
  61         private final Constructor _constructor;
  62         public String toString() { return "BindableConstructor["+_constructor+"]"; }
  63         public BindableConstructor(Constructor _constructor) { this._constructor = _constructor; }
  64         public String getSimpleName() { return _constructor.getDeclaringClass().getSimpleName(); }
  65         public <A extends Annotation> A getAnnotation(Class<A> c) { return _constructor.getAnnotation(c); }
  66         public Object impose(Object[] fields) { return Reflection.impose(_constructor, fields); }
  67         public Annotation[][] getArgAnnotations() { return _constructor.getParameterAnnotations(); }
  68         public String[]       getArgNames() { return new String[_constructor.getParameterTypes().length]; }
  69         public Class[]        getArgTypes() { return _constructor.getParameterTypes(); }
  70         public void toJava(StringBuffer sb) {
  71             sb.append("Bindable.create(");
  72             sb.append(_constructor.getDeclaringClass().getName().replace('$','.'));
  73             sb.append(".class.getConstructor(");
  74             appendClassArray(sb, _constructor.getParameterTypes());
  75             sb.append("))");
  76         }
  77     }
  78
  79     private static class BindableClass extends Bindable {
  80         private final Class _class;
  81         public String toString() { return "BindableClass["+_class+"]"; }
  82         public BindableClass(Class _class) { this._class = _class; }
  83         public String getSimpleName() { return _class.getSimpleName(); }
  84         public <A extends Annotation> A getAnnotation(Class<A> c) { return (A)_class.getAnnotation(c); }
  85         public Object impose(Object[] fields) { return Reflection.impose(_class, fields); }
  86         public Annotation[][] getArgAnnotations() {
  87             Field[] fields = _class.getFields();
  88             Annotation[][] ret = new Annotation[fields.length][];
  89             for(int i=0; i<fields.length; i++)
  90                 ret[i] = fields[i].getAnnotations();
  91             return ret;
  92         }
  93         public String[]       getArgNames() {
  94             Field[] fields = _class.getFields();
  95             String[] ret = new String[fields.length];
  96             for(int i=0; i<fields.length; i++)
  97                 ret[i] = fields[i].getName();
  98             return ret;
  99         }
 100         public Class[]       getArgTypes() {
 101             Field[] fields = _class.getFields();
 102             Class[] ret = new Class[fields.length];
 103             for(int i=0; i<fields.length; i++)
 104                 ret[i] = fields[i].getType();
 105             return ret;
 106         }
 107         public void toJava(StringBuffer sb) {
 108             sb.append("Bindable.create(");
 109             sb.append(_class.getName().replace('$','.'));
 110             sb.append(".class)");
 111         }
 112     }
 113
 114
 115     // Helpers //////////////////////////////////////////////////////////////////////////////
 116
 117     private static void appendClassArray(StringBuffer sb, Class[] c) {
 118         sb.append("new Class[] {");
 119         for(int i=0; i<c.length; i++) {
 120             sb.append(makeClass(c[i]));
 121             sb.append(".class");
 122             if (i<c.length-1)
 123                 sb.append(",");
 124         }
 125         sb.append("}");
 126     }
 127
 128     private static String makeClass(Class c) {
 129         if (!c.isArray()) return c.getName().replace('$','.');
 130         return makeClass(c.getComponentType())+"[]";
 131     }
 132
 133
 134     // Creating Bindings //////////////////////////////////////////////////////////////////////////////
 135
 136     private class SimpleBinding implements Binding, ToJava {
 137         private int[] map = null;
 138         private Object prepend = null;
 139         public SimpleBinding() { }
 140         public SimpleBinding(int[] map) { this.map = map; }
 141         public SimpleBinding(int[] map, Object prepend) { this.map = map; this.prepend = prepend; }
 142
 143         public Object invoke(Object[] o) {
 144             if (map==null) return impose(o);
 145             int max = 0;
 146             for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
 147             Object[] o2 = new Object[max+1];
 148             for(int i=0; i<o.length; i++) o2[map[i]+(prepend==null?0:1)] = o[i];
 149             if (prepend != null) o2[0] = prepend;
 150             return impose(o2);
 151         }
 152
 153         public void toJava(StringBuffer sb) {
 154             Bindable.this.toJava(sb);
 155             sb.append(".createBinding(");
 156             if (map != null) {
 157                 sb.append("new int[] {");
 158                 for(int i=0; i<map.length; i++) {
 159                     sb.append(i);
 160                     if (i<map.length-1) sb.append(",");
 161                 }
 162                 sb.append("}");
 163             }
 164             sb.append(")");
 165         }
 166     }
 167
 168 }