package edu.berkeley.sbp.util;
import java.io.*;
import java.lang.reflect.*;
+import java.lang.annotation.*;
/** Random reflection-related utilities */
public final class Reflection {
public static Object rebuild(Object o, Class c) {
- System.out.println("rebuild " + o + " (a " + (o==null?null:o.getClass().getName()) + ") " + c);
+ //System.out.println("rebuild " + o + " (a " + (o==null?null:o.getClass().getName()) + ") " + c);
if (o==null || c.isAssignableFrom(o.getClass())) return o;
if ((c == Character.class || c == Character.TYPE) && o instanceof String && ((String)o).length()==1) return new Character(((String)o).charAt(0));
if (o instanceof Character && c == String.class) return o+"";
Object[] ret = (Object[])Array.newInstance(c.getComponentType(), a.length);
for(int i=0; i<ret.length; i++) {
Object o2 = rebuild(a[i], c.getComponentType());
- if (o2 != null) System.out.println("storing " + o2.getClass().getName() + " to " + c.getComponentType());
+ //if (o2 != null) System.out.println("storing " + o2.getClass().getName() + " to " + c.getComponentType());
ret[i] = o2;
}
return ret;
return (Object[])Array.newInstance(c, i);
}
+ public static String show(Object o) {
+ if (o==null) return "null";
+ if (o instanceof Show) return ((Show)o).toString();
+ if (! (o instanceof Object[])) return o.toString() + " : " + o.getClass().getName();
+ Object[] arr = (Object[])o;
+ StringBuffer ret = new StringBuffer();
+ ret.append(o.getClass().getComponentType().getName());
+ ret.append("["+arr.length+"]:");
+ for(int i=0; i<arr.length; i++)
+ ret.append(StringUtil.indent("\n"+show(arr[i]), 4));
+ return ret.toString();
+ }
+
+ public static String show(Show o) {
+ StringBuffer ret = new StringBuffer();
+ for(Field f : o.getClass().getFields()) {
+ ret.append("\n" + f.getName() + " = ");
+ try {
+ ret.append(show(f.get(o)));
+ } catch (Exception e) {
+ ret.append("**"+e+"**");
+ throw new RuntimeException(e);
+ }
+ }
+ return o.getClass().getName() + " {" + StringUtil.indent(ret.toString(), 4) + "\n}";
+ }
+
public static Object lub(Object argo) {
if (argo instanceof Object[]) return lub((Object[])argo);
return argo;
return null;
}
+ public static interface Show {
+ }
+
+ public static Object impose(Object o, Object[] fields) {
+ if (o instanceof Class) return impose((Class)o, fields);
+ if (o instanceof Method) return impose((Method)o, fields);
+ if (o instanceof Constructor) return impose((Constructor)o, fields);
+ return null;
+ }
+ public static Object impose(Class _class, Object[] fields) {
+ try {
+ Object ret = _class.newInstance();
+ Field[] f = _class.getFields();
+ int j = 0;
+ for(int i=0; i<f.length; i++) {
+ Object tgt = Reflection.lub(fields[i]);
+ if (f[i].getType() == String.class) tgt = stringify(tgt);
+ // FUGLY
+ tgt = coerce(tgt, f[i].getType());
+ System.err.println("setting a " + f[i].getType().getName() + " to " + Reflection.show(tgt));
+ f[i].set(ret, tgt);
+ }
+ return ret;
+ } catch (Exception e) {
+ e.printStackTrace();
+ throw new RuntimeException(e);
+ }
+ }
+
+ public static Object impose(Method _method, Object[] fields) {
+ try {
+ Class[] argTypes = _method.getParameterTypes();
+ Object[] args = new Object[argTypes.length];
+ int j = 0;
+ for(int i=0; i<args.length; i++) {
+ Object tgt = Reflection.lub(fields[i]);
+ if (argTypes[i] == String.class) tgt = Reflection.stringify(tgt);
+ // FUGLY
+ tgt = Reflection.coerce(tgt, argTypes[i]);
+ System.err.println("setting a " + argTypes[i].getName() + " to " + Reflection.show(tgt));
+ args[i] = tgt;
+ }
+ System.err.println("invoking " + _method + " with " + Reflection.show(args));
+ return _method.invoke(null, args);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ public static Object impose(Constructor _ctor, Object[] fields) {
+ try {
+ Class[] argTypes = _ctor.getParameterTypes();
+ Object[] args = new Object[argTypes.length];
+ int j = 0;
+ for(int i=0; i<args.length; i++) {
+ Object tgt = Reflection.lub(fields[i]);
+ if (argTypes[i] == String.class) tgt = Reflection.stringify(tgt);
+ // FUGLY
+ tgt = Reflection.coerce(tgt, argTypes[i]);
+ System.err.println("setting a " + argTypes[i].getName() + " to " + Reflection.show(tgt));
+ args[i] = tgt;
+ }
+ return _ctor.newInstance(args);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ public static String stringify(Object o) {
+ if (o==null) return "";
+ if (!(o instanceof Object[])) return o.toString();
+ Object[] arr = (Object[])o;
+ StringBuffer ret = new StringBuffer();
+ for(int i=0; i<arr.length; i++)
+ ret.append(arr[i]);
+ return ret.toString();
+ }
+
+ public static Object coerce(Object o, Class c) {
+ if (o==null) return null;
+ if (c.isInstance(o)) return o;
+ if (c == char.class) {
+ return o.toString().charAt(0);
+ }
+
+ if (o.getClass().isArray() &&
+ o.getClass().getComponentType().isArray() &&
+ o.getClass().getComponentType().getComponentType() == String.class &&
+ c.isArray() &&
+ c.getComponentType() == String.class) {
+ String[] ret = new String[((Object[])o).length];
+ for(int i=0; i<ret.length; i++) {
+ StringBuffer sb = new StringBuffer();
+ for(Object ob : (Object[])(((Object[])o)[i]))
+ sb.append(ob);
+ ret[i] = sb.toString();
+ }
+ return ret;
+ }
+
+ if (c.isArray() && (c.getComponentType().isInstance(o))) {
+ Object[] ret = (Object[])Array.newInstance(c.getComponentType(), 1);
+ ret[0] = o;
+ return ret;
+ }
+
+ if (o.getClass().isArray() && c.isArray()) {
+ boolean ok = true;
+ for(int i=0; i<((Object[])o).length; i++) {
+ Object ob = (((Object[])o)[i]);
+ if (ob != null) {
+ System.err.println("no hit with " + c.getComponentType().getName() + " on " + Reflection.show(((Object[])o)[i]));
+ ok = false;
+ }
+ }
+ if (ok) {
+ System.err.println("hit with " + c.getComponentType().getName());
+ return Array.newInstance(c.getComponentType(), ((Object[])o).length);
+ }
+ }
+ return o;
+ }
+
+ public static 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;
+ }
+ }
+
}
projects / sbp.git / blobdiff