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/**
* Copyright (c) Rich Hickey. All rights reserved.
* The use and distribution terms for this software are covered by the
* Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
* which can be found in the file CPL.TXT at the root of this distribution.
* By using this software in any fashion, you are agreeing to be bound by
* the terms of this license.
* You must not remove this notice, or any other, from this software.
**/
using System;
using System.Reflection;
using System.Collections;
namespace org.clojure.runtime
{
public class Reflector{
public static Object invokeInstanceMethod(String name, Object target, Object[] args) //throws Exception
{
Type t = target.GetType();
IList methods = getMethods(t, args.Length, name,false);
return invokeMatchingMethod(name, target, args, t, methods,false);
}
private static object invokeMatchingMethod(String name, Object target, Object[] args, Type t, IList methods, bool statics)
{
if (methods.Count == 0)
{
throw new InvalidOperationException("No matching field or method found");
}
else if (methods.Count == 1)
{
MethodInfo m = (MethodInfo)methods[0];
return prepRet(m.Invoke(target, boxArgs(m.GetParameters(), args)));
}
else //overloaded w/same arity, let reflection choose most specific match
{
return prepRet(t.InvokeMember(name, BindingFlags.Public | (statics ? BindingFlags.Static : BindingFlags.Instance)
| BindingFlags.FlattenHierarchy | BindingFlags.InvokeMethod,
null, target, args));
}
}
public static Object invokeConstructor(Type t, Object[] args) //throws Exception
{
ConstructorInfo[] allctors = t.GetConstructors();
ArrayList ctors = new ArrayList();
foreach (ConstructorInfo ctor in allctors)
{
if (ctor.GetParameters().Length == args.Length)
ctors.Add(ctor);
}
if (ctors.Count == 0)
{
throw new InvalidOperationException("No matching ctor found");
}
else if (ctors.Count == 1)
{
ConstructorInfo ctor = (ConstructorInfo)ctors[0];
return ctor.Invoke(boxArgs(ctor.GetParameters(), args));
}
else //overloaded w/same arity, let reflection choose most specific match
{
return t.InvokeMember(null, BindingFlags.Public | BindingFlags.Instance | BindingFlags.CreateInstance,
null, null, args);
}
}
public static Object invokeStaticMethod(String name, String className, Object[] args) //throws Exception
{
Type t = Type.GetType(className);
if (name.Equals("new"))
return invokeConstructor(t, args);
IList methods = getMethods(t, args.Length, name, true);
return invokeMatchingMethod(name, null, args, t, methods,true);
}
public static Object getStaticField(String name, String className) //throws Exception
{
//check for field first
Type t = Type.GetType(className);
FieldInfo f = getField(t, name, true);
if (f != null) //field get
{
return prepRet(f.GetValue(null));
}
PropertyInfo p = getProperty(t, name, true);
if (p != null)
{
return prepRet(p.GetValue(null, null));
}
throw new InvalidOperationException("No matching field or property found");
}
public static Object setStaticField(String name, String className, Object arg1) //throws Exception
{
//check for field first
Type t = Type.GetType(className);
FieldInfo f = getField(t, name, true);
if (f != null) //field get
{
f.SetValue(null, boxArg(f.FieldType, arg1));
return arg1;
}
PropertyInfo p = getProperty(t, name, true);
if (p != null)
{
p.SetValue(null, boxArg(p.PropertyType, arg1), null);
return arg1;
}
throw new InvalidOperationException("No matching field or property found");
}
public static Object invokeInstanceMember(String name, Object target) //throws Exception
{
//check for field first
Type t = target.GetType();
FieldInfo f = getField(t, name,false);
if(f != null) //field get
{
return prepRet(f.GetValue(target));
}
PropertyInfo p = getProperty(t, name,false);
if (p != null)
{
return prepRet(p.GetValue(target, null));
}
return invokeInstanceMethod(name, target, RT.EMPTY_ARRAY);
}
public static Object invokeInstanceMember(String name, Object target, Object arg1) //throws Exception
{
//check for field first
Type t = target.GetType();
FieldInfo f = getField(t, name,false);
if (f != null) //field get
{
f.SetValue(target,boxArg(f.FieldType,arg1));
return arg1;
}
PropertyInfo p = getProperty(t, name,false);
if (p != null)
{
//could be indexed property, which we otherwise aren't dealing with yet
if(p.GetIndexParameters() != null && p.GetIndexParameters().Length == 1)
return prepRet(p.GetValue(target, new Object[]{boxArg(p.GetIndexParameters()[0].ParameterType,arg1)}));
p.SetValue(target,boxArg(p.PropertyType,arg1),null);
return arg1;
}
return invokeInstanceMethod(name, target, new Object[]{arg1});
}
public static Object invokeInstanceMember(String name, Object target, Object arg1, Object arg2) //throws Exception
{
return invokeInstanceMethod(name, target, new Object[]{arg1, arg2});
}
public static Object invokeInstanceMember(String name, Object target, Object arg1, Object arg2, Object arg3)
//throws Exception
{
return invokeInstanceMethod(name, target, new Object[]{arg1, arg2, arg3});
}
public static Object invokeInstanceMember(String name, Object target, Object arg1, Object arg2, Object arg3,
Object arg4)
//throws Exception
{
return invokeInstanceMethod(name, target, new Object[]{arg1, arg2, arg3, arg4});
}
public static Object invokeInstanceMember(String name, Object target, Object arg1, Object arg2, Object arg3,
Object arg4,
Cons arglist)
//throws Exception
{
Object[] args = new Object[4 + RT.length(arglist)];
args[0] = arg1;
args[1] = arg2;
args[2] = arg3;
args[3] = arg4;
for(int i = 4; arglist != null; i++, arglist = arglist.rest)
args[i] = arglist.first;
return invokeInstanceMethod(name, target, args);
}
public static FieldInfo getField(Type t, string name,bool statics)
{
return t.GetField(name, BindingFlags.Public | (statics ? BindingFlags.Static : BindingFlags.Instance) | BindingFlags.FlattenHierarchy);
}
public static PropertyInfo getProperty(Type t, string name, bool statics)
{
return t.GetProperty(name, BindingFlags.Public | (statics ? BindingFlags.Static : BindingFlags.Instance) | BindingFlags.FlattenHierarchy);
}
static public IList getMethods(Type t, int arity, String name, bool getStatics)
{
MethodInfo[] allmethods = t.GetMethods(BindingFlags.Public | (getStatics?BindingFlags.Static : BindingFlags.Instance)
| BindingFlags.FlattenHierarchy);
ArrayList methods = new ArrayList();
for (int i = 0; i < allmethods.Length; i++)
{
if (name.Equals(allmethods[i].Name)
&& allmethods[i].GetParameters().Length == arity)
{
methods.
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