1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/clojure/lang/Reflector.java	Sat Aug 21 06:25:44 2010 -0400
     1.3 @@ -0,0 +1,451 @@
     1.4 +/**
     1.5 + *   Copyright (c) Rich Hickey. All rights reserved.
     1.6 + *   The use and distribution terms for this software are covered by the
     1.7 + *   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
     1.8 + *   which can be found in the file epl-v10.html at the root of this distribution.
     1.9 + *   By using this software in any fashion, you are agreeing to be bound by
    1.10 + * 	 the terms of this license.
    1.11 + *   You must not remove this notice, or any other, from this software.
    1.12 + **/
    1.13 +
    1.14 +/* rich Apr 19, 2006 */
    1.15 +
    1.16 +package clojure.lang;
    1.17 +
    1.18 +import java.lang.reflect.*;
    1.19 +import java.util.ArrayList;
    1.20 +import java.util.Iterator;
    1.21 +import java.util.List;
    1.22 +import java.util.Arrays;
    1.23 +
    1.24 +public class Reflector{
    1.25 +
    1.26 +public static Object invokeInstanceMethod(Object target, String methodName, Object[] args) throws Exception{
    1.27 +	try
    1.28 +		{
    1.29 +		Class c = target.getClass();
    1.30 +		List methods = getMethods(c, args.length, methodName, false);
    1.31 +		return invokeMatchingMethod(methodName, methods, target, args);
    1.32 +		}
    1.33 +	catch(InvocationTargetException e)
    1.34 +		{
    1.35 +		if(e.getCause() instanceof Exception)
    1.36 +			throw (Exception) e.getCause();
    1.37 +		else if(e.getCause() instanceof Error)
    1.38 +			throw (Error) e.getCause();
    1.39 +		throw e;
    1.40 +		}
    1.41 +}
    1.42 +
    1.43 +private static String noMethodReport(String methodName, Object target){
    1.44 +	 return "No matching method found: " + methodName
    1.45 +			+ (target==null?"":" for " + target.getClass());
    1.46 +}
    1.47 +static Object invokeMatchingMethod(String methodName, List methods, Object target, Object[] args)
    1.48 +		throws Exception{
    1.49 +	Method m = null;
    1.50 +	Object[] boxedArgs = null;
    1.51 +	if(methods.isEmpty())
    1.52 +		{
    1.53 +		throw new IllegalArgumentException(noMethodReport(methodName,target));
    1.54 +		}
    1.55 +	else if(methods.size() == 1)
    1.56 +		{
    1.57 +		m = (Method) methods.get(0);
    1.58 +		boxedArgs = boxArgs(m.getParameterTypes(), args);
    1.59 +		}
    1.60 +	else //overloaded w/same arity
    1.61 +		{
    1.62 +		Method foundm = null;
    1.63 +		for(Iterator i = methods.iterator(); i.hasNext();)
    1.64 +			{
    1.65 +			m = (Method) i.next();
    1.66 +
    1.67 +			Class[] params = m.getParameterTypes();
    1.68 +			if(isCongruent(params, args))
    1.69 +				{
    1.70 +				if(foundm == null || Compiler.subsumes(params, foundm.getParameterTypes()))
    1.71 +					{
    1.72 +					foundm = m;
    1.73 +					boxedArgs = boxArgs(params, args);
    1.74 +					}
    1.75 +				}
    1.76 +			}
    1.77 +		m = foundm;
    1.78 +		}
    1.79 +	if(m == null)
    1.80 +		throw new IllegalArgumentException(noMethodReport(methodName,target));
    1.81 +
    1.82 +	if(!Modifier.isPublic(m.getDeclaringClass().getModifiers()))
    1.83 +		{
    1.84 +		//public method of non-public class, try to find it in hierarchy
    1.85 +		Method oldm = m;
    1.86 +		m = getAsMethodOfPublicBase(m.getDeclaringClass(), m);
    1.87 +		if(m == null)
    1.88 +			throw new IllegalArgumentException("Can't call public method of non-public class: " +
    1.89 +			                                    oldm.toString());
    1.90 +		}
    1.91 +	try
    1.92 +		{
    1.93 +		return prepRet(m.invoke(target, boxedArgs));
    1.94 +		}
    1.95 +	catch(InvocationTargetException e)
    1.96 +		{
    1.97 +		if(e.getCause() instanceof Exception)
    1.98 +			throw (Exception) e.getCause();
    1.99 +		else if(e.getCause() instanceof Error)
   1.100 +			throw (Error) e.getCause();
   1.101 +		throw e;
   1.102 +		}
   1.103 +
   1.104 +}
   1.105 +
   1.106 +public static Method getAsMethodOfPublicBase(Class c, Method m){
   1.107 +	for(Class iface : c.getInterfaces())
   1.108 +		{
   1.109 +		for(Method im : iface.getMethods())
   1.110 +			{
   1.111 +			if(im.getName().equals(m.getName())
   1.112 +			   && Arrays.equals(m.getParameterTypes(), im.getParameterTypes()))
   1.113 +				{
   1.114 +				return im;
   1.115 +				}
   1.116 +			}
   1.117 +		}
   1.118 +	Class sc = c.getSuperclass();
   1.119 +	if(sc == null)
   1.120 +		return null;
   1.121 +	for(Method scm : sc.getMethods())
   1.122 +		{
   1.123 +		if(scm.getName().equals(m.getName())
   1.124 +		   && Arrays.equals(m.getParameterTypes(), scm.getParameterTypes())
   1.125 +		   && Modifier.isPublic(scm.getDeclaringClass().getModifiers()))
   1.126 +			{
   1.127 +			return scm;
   1.128 +			}
   1.129 +		}
   1.130 +	return getAsMethodOfPublicBase(sc, m);
   1.131 +}
   1.132 +
   1.133 +public static Object invokeConstructor(Class c, Object[] args) throws Exception{
   1.134 +	try
   1.135 +		{
   1.136 +		Constructor[] allctors = c.getConstructors();
   1.137 +		ArrayList ctors = new ArrayList();
   1.138 +		for(int i = 0; i < allctors.length; i++)
   1.139 +			{
   1.140 +			Constructor ctor = allctors[i];
   1.141 +			if(ctor.getParameterTypes().length == args.length)
   1.142 +				ctors.add(ctor);
   1.143 +			}
   1.144 +		if(ctors.isEmpty())
   1.145 +			{
   1.146 +			throw new IllegalArgumentException("No matching ctor found"
   1.147 +				+ " for " + c);
   1.148 +			}
   1.149 +		else if(ctors.size() == 1)
   1.150 +			{
   1.151 +			Constructor ctor = (Constructor) ctors.get(0);
   1.152 +			return ctor.newInstance(boxArgs(ctor.getParameterTypes(), args));
   1.153 +			}
   1.154 +		else //overloaded w/same arity
   1.155 +			{
   1.156 +			for(Iterator iterator = ctors.iterator(); iterator.hasNext();)
   1.157 +				{
   1.158 +				Constructor ctor = (Constructor) iterator.next();
   1.159 +				Class[] params = ctor.getParameterTypes();
   1.160 +				if(isCongruent(params, args))
   1.161 +					{
   1.162 +					Object[] boxedArgs = boxArgs(params, args);
   1.163 +					return ctor.newInstance(boxedArgs);
   1.164 +					}
   1.165 +				}
   1.166 +			throw new IllegalArgumentException("No matching ctor found"
   1.167 +				+ " for " + c);
   1.168 +			}
   1.169 +		}
   1.170 +	catch(InvocationTargetException e)
   1.171 +		{
   1.172 +		if(e.getCause() instanceof Exception)
   1.173 +			throw (Exception) e.getCause();
   1.174 +		else if(e.getCause() instanceof Error)
   1.175 +			throw (Error) e.getCause();
   1.176 +		throw e;
   1.177 +		}
   1.178 +}
   1.179 +
   1.180 +public static Object invokeStaticMethodVariadic(String className, String methodName, Object... args) throws Exception{
   1.181 +	return invokeStaticMethod(className, methodName, args);
   1.182 +
   1.183 +}
   1.184 +
   1.185 +public static Object invokeStaticMethod(String className, String methodName, Object[] args) throws Exception{
   1.186 +	Class c = RT.classForName(className);
   1.187 +	try
   1.188 +		{
   1.189 +		return invokeStaticMethod(c, methodName, args);
   1.190 +		}
   1.191 +	catch(InvocationTargetException e)
   1.192 +		{
   1.193 +		if(e.getCause() instanceof Exception)
   1.194 +			throw (Exception) e.getCause();
   1.195 +		else if(e.getCause() instanceof Error)
   1.196 +			throw (Error) e.getCause();
   1.197 +		throw e;
   1.198 +		}
   1.199 +}
   1.200 +
   1.201 +public static Object invokeStaticMethod(Class c, String methodName, Object[] args) throws Exception{
   1.202 +	if(methodName.equals("new"))
   1.203 +		return invokeConstructor(c, args);
   1.204 +	List methods = getMethods(c, args.length, methodName, true);
   1.205 +	return invokeMatchingMethod(methodName, methods, null, args);
   1.206 +}
   1.207 +
   1.208 +public static Object getStaticField(String className, String fieldName) throws Exception{
   1.209 +	Class c = RT.classForName(className);
   1.210 +	return getStaticField(c, fieldName);
   1.211 +}
   1.212 +
   1.213 +public static Object getStaticField(Class c, String fieldName) throws Exception{
   1.214 +//	if(fieldName.equals("class"))
   1.215 +//		return c;
   1.216 +	Field f = getField(c, fieldName, true);
   1.217 +	if(f != null)
   1.218 +		{
   1.219 +		return prepRet(f.get(null));
   1.220 +		}
   1.221 +	throw new IllegalArgumentException("No matching field found: " + fieldName
   1.222 +		+ " for " + c);
   1.223 +}
   1.224 +
   1.225 +public static Object setStaticField(String className, String fieldName, Object val) throws Exception{
   1.226 +	Class c = RT.classForName(className);
   1.227 +	return setStaticField(c, fieldName, val);
   1.228 +}
   1.229 +
   1.230 +public static Object setStaticField(Class c, String fieldName, Object val) throws Exception{
   1.231 +	Field f = getField(c, fieldName, true);
   1.232 +	if(f != null)
   1.233 +		{
   1.234 +		f.set(null, boxArg(f.getType(), val));
   1.235 +		return val;
   1.236 +		}
   1.237 +	throw new IllegalArgumentException("No matching field found: " + fieldName
   1.238 +		+ " for " + c);
   1.239 +}
   1.240 +
   1.241 +public static Object getInstanceField(Object target, String fieldName) throws Exception{
   1.242 +	Class c = target.getClass();
   1.243 +	Field f = getField(c, fieldName, false);
   1.244 +	if(f != null)
   1.245 +		{
   1.246 +		return prepRet(f.get(target));
   1.247 +		}
   1.248 +	throw new IllegalArgumentException("No matching field found: " + fieldName
   1.249 +		+ " for " + target.getClass());
   1.250 +}
   1.251 +
   1.252 +public static Object setInstanceField(Object target, String fieldName, Object val) throws Exception{
   1.253 +	Class c = target.getClass();
   1.254 +	Field f = getField(c, fieldName, false);
   1.255 +	if(f != null)
   1.256 +		{
   1.257 +		f.set(target, boxArg(f.getType(), val));
   1.258 +		return val;
   1.259 +		}
   1.260 +	throw new IllegalArgumentException("No matching field found: " + fieldName
   1.261 +		+ " for " + target.getClass());
   1.262 +}
   1.263 +
   1.264 +public static Object invokeNoArgInstanceMember(Object target, String name) throws Exception{
   1.265 +	//favor method over field
   1.266 +	List meths = getMethods(target.getClass(), 0, name, false);
   1.267 +	if(meths.size() > 0)
   1.268 +		return invokeMatchingMethod(name, meths, target, RT.EMPTY_ARRAY);
   1.269 +	else
   1.270 +		return getInstanceField(target, name);
   1.271 +}
   1.272 +
   1.273 +public static Object invokeInstanceMember(Object target, String name) throws Exception{
   1.274 +	//check for field first
   1.275 +	Class c = target.getClass();
   1.276 +	Field f = getField(c, name, false);
   1.277 +	if(f != null)  //field get
   1.278 +		{
   1.279 +		return prepRet(f.get(target));
   1.280 +		}
   1.281 +	return invokeInstanceMethod(target, name, RT.EMPTY_ARRAY);
   1.282 +}
   1.283 +
   1.284 +public static Object invokeInstanceMember(String name, Object target, Object arg1) throws Exception{
   1.285 +	//check for field first
   1.286 +	Class c = target.getClass();
   1.287 +	Field f = getField(c, name, false);
   1.288 +	if(f != null)  //field set
   1.289 +		{
   1.290 +		f.set(target, boxArg(f.getType(), arg1));
   1.291 +		return arg1;
   1.292 +		}
   1.293 +	return invokeInstanceMethod(target, name, new Object[]{arg1});
   1.294 +}
   1.295 +
   1.296 +public static Object invokeInstanceMember(String name, Object target, Object... args) throws Exception{
   1.297 +	return invokeInstanceMethod(target, name, args);
   1.298 +}
   1.299 +
   1.300 +
   1.301 +static public Field getField(Class c, String name, boolean getStatics){
   1.302 +	Field[] allfields = c.getFields();
   1.303 +	for(int i = 0; i < allfields.length; i++)
   1.304 +		{
   1.305 +		if(name.equals(allfields[i].getName())
   1.306 +		   && Modifier.isStatic(allfields[i].getModifiers()) == getStatics)
   1.307 +			return allfields[i];
   1.308 +		}
   1.309 +	return null;
   1.310 +}
   1.311 +
   1.312 +static public List getMethods(Class c, int arity, String name, boolean getStatics){
   1.313 +	Method[] allmethods = c.getMethods();
   1.314 +	ArrayList methods = new ArrayList();
   1.315 +	ArrayList bridgeMethods = new ArrayList();
   1.316 +	for(int i = 0; i < allmethods.length; i++)
   1.317 +		{
   1.318 +		Method method = allmethods[i];
   1.319 +		if(name.equals(method.getName())
   1.320 +		   && Modifier.isStatic(method.getModifiers()) == getStatics
   1.321 +		   && method.getParameterTypes().length == arity)
   1.322 +			{
   1.323 +			try
   1.324 +				{
   1.325 +				if(method.isBridge()
   1.326 +				   && c.getMethod(method.getName(), method.getParameterTypes())
   1.327 +						.equals(method))
   1.328 +					bridgeMethods.add(method);
   1.329 +				else
   1.330 +					methods.add(method);
   1.331 +				}
   1.332 +			catch(NoSuchMethodException e)
   1.333 +				{
   1.334 +				}
   1.335 +			}
   1.336 +//			   && (!method.isBridge()
   1.337 +//			       || (c == StringBuilder.class &&
   1.338 +//			          c.getMethod(method.getName(), method.getParameterTypes())
   1.339 +//					.equals(method))))
   1.340 +//				{
   1.341 +//				methods.add(allmethods[i]);
   1.342 +//				}
   1.343 +		}
   1.344 +
   1.345 +	if(methods.isEmpty())
   1.346 +		methods.addAll(bridgeMethods);
   1.347 +	
   1.348 +	if(!getStatics && c.isInterface())
   1.349 +		{
   1.350 +		allmethods = Object.class.getMethods();
   1.351 +		for(int i = 0; i < allmethods.length; i++)
   1.352 +			{
   1.353 +			if(name.equals(allmethods[i].getName())
   1.354 +			   && Modifier.isStatic(allmethods[i].getModifiers()) == getStatics
   1.355 +			   && allmethods[i].getParameterTypes().length == arity)
   1.356 +				{
   1.357 +				methods.add(allmethods[i]);
   1.358 +				}
   1.359 +			}
   1.360 +		}
   1.361 +	return methods;
   1.362 +}
   1.363 +
   1.364 +
   1.365 +static Object boxArg(Class paramType, Object arg){
   1.366 +	if(!paramType.isPrimitive())
   1.367 +		return paramType.cast(arg);
   1.368 +	else if(paramType == boolean.class)
   1.369 +		return Boolean.class.cast(arg);
   1.370 +	else if(paramType == char.class)
   1.371 +		return Character.class.cast(arg);
   1.372 +	else if(arg instanceof Number)
   1.373 +		{
   1.374 +		Number n = (Number) arg;
   1.375 +		if(paramType == int.class)
   1.376 +			return n.intValue();
   1.377 +		else if(paramType == float.class)
   1.378 +			return n.floatValue();
   1.379 +		else if(paramType == double.class)
   1.380 +			return n.doubleValue();
   1.381 +		else if(paramType == long.class)
   1.382 +			return n.longValue();
   1.383 +		else if(paramType == short.class)
   1.384 +			return n.shortValue();
   1.385 +		else if(paramType == byte.class)
   1.386 +			return n.byteValue();
   1.387 +		}
   1.388 +	throw new IllegalArgumentException("Unexpected param type, expected: " + paramType +
   1.389 +	                                   ", given: " + arg.getClass().getName());
   1.390 +}
   1.391 +
   1.392 +static Object[] boxArgs(Class[] params, Object[] args){
   1.393 +	if(params.length == 0)
   1.394 +		return null;
   1.395 +	Object[] ret = new Object[params.length];
   1.396 +	for(int i = 0; i < params.length; i++)
   1.397 +		{
   1.398 +		Object arg = args[i];
   1.399 +		Class paramType = params[i];
   1.400 +		ret[i] = boxArg(paramType, arg);
   1.401 +		}
   1.402 +	return ret;
   1.403 +}
   1.404 +
   1.405 +static public boolean paramArgTypeMatch(Class paramType, Class argType){
   1.406 +	if(argType == null)
   1.407 +		return !paramType.isPrimitive();
   1.408 +	if(paramType == argType || paramType.isAssignableFrom(argType))
   1.409 +		return true;
   1.410 +	if(paramType == int.class)
   1.411 +		return argType == Integer.class;// || argType == FixNum.class;
   1.412 +	else if(paramType == float.class)
   1.413 +		return argType == Float.class;
   1.414 +	else if(paramType == double.class)
   1.415 +		return argType == Double.class;// || argType == DoubleNum.class;
   1.416 +	else if(paramType == long.class)
   1.417 +		return argType == Long.class;// || argType == BigNum.class;
   1.418 +	else if(paramType == char.class)
   1.419 +		return argType == Character.class;
   1.420 +	else if(paramType == short.class)
   1.421 +		return argType == Short.class;
   1.422 +	else if(paramType == byte.class)
   1.423 +		return argType == Byte.class;
   1.424 +	else if(paramType == boolean.class)
   1.425 +		return argType == Boolean.class;
   1.426 +	return false;
   1.427 +}
   1.428 +
   1.429 +static boolean isCongruent(Class[] params, Object[] args){
   1.430 +	boolean ret = false;
   1.431 +	if(args == null)
   1.432 +		return params.length == 0;
   1.433 +	if(params.length == args.length)
   1.434 +		{
   1.435 +		ret = true;
   1.436 +		for(int i = 0; ret && i < params.length; i++)
   1.437 +			{
   1.438 +			Object arg = args[i];
   1.439 +			Class argType = (arg == null) ? null : arg.getClass();
   1.440 +			Class paramType = params[i];
   1.441 +			ret = paramArgTypeMatch(paramType, argType);
   1.442 +			}
   1.443 +		}
   1.444 +	return ret;
   1.445 +}
   1.446 +
   1.447 +public static Object prepRet(Object x){
   1.448 +//	if(c == boolean.class)
   1.449 +//		return ((Boolean) x).booleanValue() ? RT.T : null;
   1.450 +	if(x instanceof Boolean)
   1.451 +		return ((Boolean) x)?Boolean.TRUE:Boolean.FALSE;
   1.452 +	return x;
   1.453 +}
   1.454 +}