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Java.java

/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
 * Copyright (C) 2004 David Corbin <dcorbin@users.sourceforge.net>
 * Copyright (C) 2004-2005 Thomas E Enebo <enebo@acm.org>
 * Copyright (C) 2006 Kresten Krab Thorup <krab@gnu.org>
 * Copyright (C) 2007 William N Dortch <bill.dortch@gmail.com>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the CPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the CPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/
package org.jruby.javasupport;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;
import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.RubyBignum;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.RubyFloat;
import org.jruby.RubyHash;
import org.jruby.RubyModule;
import org.jruby.RubyNumeric;
import org.jruby.RubyProc;
import org.jruby.RubyString;
import org.jruby.RubyTime;
import org.jruby.javasupport.proxy.JavaProxyClass;
import org.jruby.javasupport.proxy.JavaProxyConstructor;
import org.jruby.javasupport.proxy.JavaProxyMethod;
import org.jruby.runtime.Arity;
import org.jruby.runtime.Block;
import org.jruby.runtime.CallbackFactory;
import org.jruby.runtime.ClassIndex;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.callback.Callback;
import org.jruby.util.ByteList;
import org.jruby.util.collections.IntHashMap;

public class Java {
    public static RubyModule createJavaModule(Ruby runtime) {
        RubyModule javaModule = runtime.defineModule("Java");
        CallbackFactory callbackFactory = runtime.callbackFactory(Java.class);
        javaModule.defineModuleFunction("define_exception_handler", callbackFactory.getOptSingletonMethod("define_exception_handler"));
        javaModule.defineModuleFunction("primitive_to_java", callbackFactory.getSingletonMethod("primitive_to_java", IRubyObject.class));
        javaModule.defineModuleFunction("java_to_primitive", callbackFactory.getSingletonMethod("java_to_primitive", IRubyObject.class));
        javaModule.defineModuleFunction("java_to_ruby", callbackFactory.getSingletonMethod("java_to_ruby", IRubyObject.class));
        javaModule.defineModuleFunction("ruby_to_java", callbackFactory.getSingletonMethod("ruby_to_java", IRubyObject.class));
        javaModule.defineModuleFunction("new_proxy_instance", callbackFactory.getOptSingletonMethod("new_proxy_instance"));
        javaModule.defineModuleFunction("set_deprecated_interface_syntax", callbackFactory.getSingletonMethod("set_deprecated_interface_syntax", IRubyObject.class));

        JavaObject.createJavaObjectClass(runtime, javaModule);
        JavaArray.createJavaArrayClass(runtime, javaModule);
        JavaClass.createJavaClassClass(runtime, javaModule);
        JavaMethod.createJavaMethodClass(runtime, javaModule);
        JavaConstructor.createJavaConstructorClass(runtime, javaModule);
        JavaField.createJavaFieldClass(runtime, javaModule);

        // also create the JavaProxy* classes
        JavaProxyClass.createJavaProxyModule(runtime);

        RubyModule javaUtils = runtime.defineModule("JavaUtilities");
        javaUtils.defineFastModuleFunction("wrap", callbackFactory.getFastSingletonMethod("wrap",IRubyObject.class));
        javaUtils.defineFastModuleFunction("valid_constant_name?", callbackFactory.getFastSingletonMethod("valid_constant_name_p",IRubyObject.class));
        javaUtils.defineFastModuleFunction("primitive_match", callbackFactory.getFastSingletonMethod("primitive_match",IRubyObject.class,IRubyObject.class));
        javaUtils.defineFastModuleFunction("access", callbackFactory.getFastSingletonMethod("access",IRubyObject.class));
        javaUtils.defineFastModuleFunction("matching_method", callbackFactory.getFastSingletonMethod("matching_method", IRubyObject.class, IRubyObject.class));
        javaUtils.defineFastModuleFunction("get_deprecated_interface_proxy", callbackFactory.getFastSingletonMethod("get_deprecated_interface_proxy", IRubyObject.class));
        javaUtils.defineFastModuleFunction("get_interface_module", callbackFactory.getFastSingletonMethod("get_interface_module", IRubyObject.class));
        javaUtils.defineFastModuleFunction("get_package_module", callbackFactory.getFastSingletonMethod("get_package_module", IRubyObject.class));
        javaUtils.defineFastModuleFunction("get_proxy_class", callbackFactory.getFastSingletonMethod("get_proxy_class", IRubyObject.class));
        javaUtils.defineFastModuleFunction("add_proxy_extender", callbackFactory.getFastSingletonMethod("add_proxy_extender", IRubyObject.class));

        javaUtils.dataWrapStruct(new ProxyData(callbackFactory.getFastSingletonMethod("concrete_proxy_inherited", IRubyObject.class)));

        JavaArrayUtilities.createJavaArrayUtilitiesModule(runtime);
        
        RubyClass javaProxy = runtime.defineClass("JavaProxy", runtime.getObject(), runtime.getObject().getAllocator());
        javaProxy.getMetaClass().defineFastMethod("new_instance_for", callbackFactory.getFastSingletonMethod("new_instance_for", IRubyObject.class));
        javaProxy.getMetaClass().defineFastMethod("to_java_object", callbackFactory.getFastSingletonMethod("to_java_object"));

        return javaModule;
    }

    // JavaProxy
    public static IRubyObject new_instance_for(IRubyObject recv, IRubyObject java_object) {
        IRubyObject new_instance = ((RubyClass)recv).allocate();
        new_instance.setInstanceVariable("@java_object",java_object);
        return new_instance;
    }

    // If the proxy class itself is passed as a parameter this will be called by Java#ruby_to_java    
    public static IRubyObject to_java_object(IRubyObject recv) {
        return recv.getInstanceVariable("@java_class");
    }

    private final static class ProxyData {
        public final IntHashMap classes = new IntHashMap();
        public final IntHashMap interfaces = new IntHashMap();
        public final List extenders = new ArrayList();
        public final Map matchCache = new HashMap();
        public final Callback callback;
        public ProxyData(Callback c) { this.callback = c; };
    }

    // JavaUtilities
    
    /**
     * Add a new proxy extender. This is used by JavaUtilities to allow adding methods
     * to a given type's proxy and all types descending from that proxy's Java class.
     */
    public static IRubyObject add_proxy_extender(IRubyObject recv, IRubyObject extender) {
        ProxyData pdata = ((ProxyData)recv.dataGetStruct());
        pdata.extenders.add(extender);
        ThreadContext tc = recv.getRuntime().getCurrentContext();
        for(Iterator iter = pdata.classes.values().iterator(); iter.hasNext(); ) {
            extender.callMethod(tc, "extend_proxy", (IRubyObject)iter.next());
        }
        for(Iterator iter = pdata.interfaces.values().iterator(); iter.hasNext(); ) {
            extender.callMethod(tc, "extend_proxy", (IRubyObject)iter.next());
        }
        return recv.getRuntime().getNil();
    }
    
    private static boolean supportExtendableInterfaces = false;
    private static boolean supportExtendableInterfaces() {
        // TODO: some kind of user mechanism to enable this
        return supportExtendableInterfaces;
    }
    public static IRubyObject set_deprecated_interface_syntax(IRubyObject recv, IRubyObject object, Block unusedBlock) {
        supportExtendableInterfaces = object.isTrue();
        return object;
    }
    
    public static IRubyObject get_interface_module(IRubyObject recv, IRubyObject javaClassObject) {
        Ruby runtime = recv.getRuntime();
        JavaClass javaClass;
        if (javaClassObject instanceof RubyString) {
            javaClass = JavaClass.for_name(recv, javaClassObject);
        } else if (javaClassObject instanceof JavaClass) {
            javaClass = (JavaClass)javaClassObject;
        } else  {
            throw runtime.newArgumentError("expected JavaClass, got " + javaClassObject);
        }
        if ( !javaClass.javaClass().isInterface()) {
            throw runtime.newArgumentError(javaClass.toString() + " is not an interface");
        }
        int class_id = RubyNumeric.fix2int(javaClass.id());
        ProxyData pdata = ((ProxyData)recv.dataGetStruct());
        IntHashMap interfaces = pdata.interfaces;
        RubyModule interfaceModule;
        synchronized(javaClass) {
            if ((interfaceModule = (RubyModule)interfaces.get(class_id)) == null) {
                interfaceModule = (RubyModule)runtime.getModule("JavaInterfaceTemplate").dup();
                interfaceModule.setInstanceVariable("@java_class",javaClass);
                addToJavaPackageModule2(interfaceModule,javaClass);
                interfaces.put(class_id,interfaceModule);
                javaClass.setupInterfaceModule(interfaceModule);
                // include any interfaces we extend
                Class[] extended = javaClass.javaClass().getInterfaces();
                for (int i = extended.length; --i >= 0; ) {
                    JavaClass extendedClass = JavaClass.get(runtime,extended[i]);
                    RubyModule extModule;
                    if ((extModule =
                            (RubyModule)interfaces.get(RubyNumeric.fix2int(extendedClass.id()))) == null) {
                        extModule = (RubyModule)get_interface_module(recv,extendedClass);
                    }
                    interfaceModule.includeModule(extModule);
                }
                for(Iterator iter = pdata.extenders.iterator(); iter.hasNext(); ) {
                    ((IRubyObject)iter.next()).callMethod(
                            runtime.getCurrentContext(), "extend_proxy", interfaceModule);
                }
            }
        }
        return interfaceModule;
    }

    // Note: this isn't really all that deprecated, as it is used for
    // internal purposes, at least for now. But users should be discouraged
    // from calling this directly; eventually it will go away.
    public static IRubyObject get_deprecated_interface_proxy(IRubyObject recv, IRubyObject java_class_object) {
        Ruby runtime = recv.getRuntime();
        JavaClass java_class;
        if (java_class_object instanceof RubyString) {
            java_class = JavaClass.for_name(recv, java_class_object);
        } else if (java_class_object instanceof JavaClass) {
            java_class = (JavaClass)java_class_object;
        } else  {
            throw runtime.newArgumentError("expected JavaClass, got " + java_class_object);
        }
        if (!java_class.javaClass().isInterface()) {
            throw runtime.newArgumentError("expected Java interface class, got " + java_class_object);
        }
        int class_id = RubyNumeric.fix2int(java_class.id());
        ProxyData pdata = ((ProxyData)recv.dataGetStruct());
        IntHashMap proxy_classes = pdata.classes;
        RubyClass proxy_class;
        synchronized(java_class) {
            if((proxy_class = (RubyClass)proxy_classes.get(class_id)) == null) {
                RubyModule interfaceModule = (RubyModule)get_interface_module(recv,java_class);
                proxy_class = createProxyClass(recv,runtime.getClass("InterfaceJavaProxy"),
                        java_class,true,proxy_classes,class_id);
                // including interface module so old-style interface "subclasses" will
                // respond correctly to #kind_of?, etc.
                proxy_class.includeModule(interfaceModule);
                // add reference to interface module
                if (proxy_class.getConstantAt("Includable") == null) {
                    proxy_class.const_set(runtime.newSymbol("Includable"),interfaceModule);
                }

                for(Iterator iter = pdata.extenders.iterator(); iter.hasNext(); ) {
                    ((IRubyObject)iter.next()).callMethod(
                            runtime.getCurrentContext(), "extend_proxy", proxy_class);
                }
            }
        }
        return proxy_class;
    }

    public static IRubyObject get_proxy_class(IRubyObject recv, IRubyObject java_class_object) {
        Ruby runtime = recv.getRuntime();
        JavaClass java_class;
        if (java_class_object instanceof RubyString) {
            java_class = JavaClass.for_name(recv, java_class_object);
        } else if (java_class_object instanceof JavaClass) {
            java_class = (JavaClass)java_class_object;
        } else  {
            throw runtime.newArgumentError("expected JavaClass, got " + java_class_object);
        }
        Class c;
        if ((c = java_class.javaClass()).isInterface() && !supportExtendableInterfaces()) {
            return get_interface_module(recv,java_class);
        }
        int class_id = RubyNumeric.fix2int(java_class.id());
        ProxyData pdata = ((ProxyData)recv.dataGetStruct());
        IntHashMap proxy_classes = pdata.classes;
        RubyClass proxy_class;
        synchronized(java_class) {
            if((proxy_class = (RubyClass)proxy_classes.get(class_id)) == null) {

                if(c.isInterface()) {
                    RubyModule interfaceModule = (RubyModule)get_interface_module(recv,java_class);
                    // backwards compatibility mode
                    proxy_class = createProxyClass(recv,runtime.getClass("InterfaceJavaProxy"),
                            java_class,true,proxy_classes,class_id);
                    // including interface module so old-style interface "subclasses" will
                    // respond correctly to #kind_of?, etc.
                    proxy_class.includeModule(interfaceModule);
                    // add reference to interface module
                    if (proxy_class.getConstantAt("Includable") == null) {
                        proxy_class.const_set(runtime.newSymbol("Includable"),interfaceModule);
                    }
                    
                } else if(c.isArray()) {
                    proxy_class = createProxyClass(recv,runtime.getClass("ArrayJavaProxy"),
                            java_class,true,proxy_classes,class_id);

                } else if (c.isPrimitive()) {
                    proxy_class = createProxyClass(recv,runtime.getClass("ConcreteJavaProxy"),
                            java_class,true,proxy_classes,class_id);

                } else if (c == Object.class) {
                    // java.lang.Object is added at root of java proxy classes
                    proxy_class = createProxyClass(recv,runtime.getClass("ConcreteJavaProxy"),
                            java_class,true,proxy_classes,class_id);
                    proxy_class.getMetaClass().defineFastMethod("inherited", pdata.callback);
                    addToJavaPackageModule2(proxy_class,java_class);

                } else {
                    // other java proxy classes added under their superclass' java proxy
                    proxy_class = createProxyClass(recv,
                            get_proxy_class(recv,runtime.newString(c.getSuperclass().getName())),
                            java_class,false,proxy_classes,class_id);

                    // include interface modules into the proxy class
                    Class[] interfaces = c.getInterfaces();
                    for (int i = interfaces.length; --i >= 0; ) {
                        JavaClass ifc = JavaClass.get(runtime,interfaces[i]);
                        proxy_class.includeModule(get_interface_module(recv,ifc));
                    }
                    if (Modifier.isPublic(c.getModifiers())) addToJavaPackageModule2(proxy_class,java_class);
                }
                for(Iterator iter = pdata.extenders.iterator(); iter.hasNext(); ) {
                    ((IRubyObject)iter.next()).callMethod(
                            runtime.getCurrentContext(), "extend_proxy", proxy_class);
                }
            }
        }
        return proxy_class;
    }
    
    private static RubyClass createProxyClass(IRubyObject recv, IRubyObject baseType,
            JavaClass javaClass, boolean invokeInherited, IntHashMap proxyClasses, int classId ) {
        RubyClass proxyClass = RubyClass.newClass(recv, new IRubyObject[]{ baseType },
                Block.NULL_BLOCK, invokeInherited);
        proxyClass.callMethod(recv.getRuntime().getCurrentContext(), "java_class=", javaClass);
        proxyClasses.put(classId, proxyClass);
        // We do not setup the proxy before we register it so that same-typed constants do
        // not try and create a fresh proxy class and go into an infinite loop
        javaClass.setupProxy(proxyClass);
        return proxyClass;
    }

    public static IRubyObject concrete_proxy_inherited(IRubyObject recv, IRubyObject subclass) {
        Ruby runtime = recv.getRuntime();
        ThreadContext tc = runtime.getCurrentContext();
        RubyClass javaProxyClass = runtime.getClass("JavaProxy").getMetaClass();
        recv.callMethod(tc,javaProxyClass, "inherited", new IRubyObject[]{subclass}, org.jruby.runtime.CallType.SUPER, Block.NULL_BLOCK);
        // TODO: move to Java
        return runtime.getModule("JavaUtilities").callMethod(tc, "setup_java_subclass", new IRubyObject[]{subclass, recv.callMethod(tc,"java_class")});
    }
    
    private static boolean useJavaPackageModules (Ruby runtime) {
        final RubyString javaModuleVar = runtime.newString("JRUBY_JAVA_MODULES");
        RubyHash h = ((RubyHash)runtime.getObject().getConstant("ENV"));
        IRubyObject useMods = h.aref(javaModuleVar);
        // right now, defaulting to 'true' unless explicity set to 'false'.
        // might want to do this the other way
        return (useMods == null ||
                !(useMods instanceof RubyString) ||
                ! "false".equals(useMods.toString()));
    }
    
    // package scheme 1: module per package segment, all caps: Java::JAVA::LANG::Object
    private static void addToJavaPackageModule(RubyModule proxyClass, JavaClass javaClass) {
        Class clazz = javaClass.javaClass();
        String fullName = clazz.getName();
        int endPackage;
        // we'll only map conventional class names to modules 
        if (fullName == null ||
                (endPackage = fullName.lastIndexOf('.')) == -1  ||
                fullName.indexOf('$') != -1 ||
                !Character.isUpperCase(fullName.charAt(endPackage + 1))) {
            return;
        }
        Ruby runtime = proxyClass.getRuntime();
        RubyModule parent = runtime.getModule("Java");
        for (int start = 0, offset = 0; start < endPackage; start = offset + 1) {
            offset = fullName.indexOf('.',start);
            String moduleName = fullName.substring(start,offset).toUpperCase();
            IRubyObject child = parent.getConstantAt(moduleName);
            if (child == null) {
                child = createPackageModule(parent,moduleName,fullName.substring(0,offset));
            } else if (!(child instanceof RubyModule)) {
                return;
            }
            parent = (RubyModule)child;
        }
        String className = fullName.substring(endPackage + 1);
        if (parent.getConstantAt(className) == null) {
            parent.const_set(runtime.newSymbol(className),proxyClass);
        }
    }

    // package scheme 2: separate module for each full package name, constructed 
    // from the camel-cased package segments: Java::JavaLang::Object, 
    private static void addToJavaPackageModule2(RubyModule proxyClass, JavaClass javaClass) {
        Class clazz = javaClass.javaClass();
        String fullName;
        if ((fullName = clazz.getName()) == null) return;
        int endPackage = fullName.lastIndexOf('.');
        // we'll only map conventional class names to modules 
        if (fullName.indexOf('$') != -1 || !Character.isUpperCase(fullName.charAt(endPackage + 1))) {
            return;
        }
        String packageName;
        if (endPackage < 0) {
            packageName = "Default";
        } else {
            StringBuffer buf = new StringBuffer();
            for (int start = 0, offset = 0; start < endPackage; start = offset + 1) {
                offset = fullName.indexOf('.',start);
                buf.append(Character.toUpperCase(fullName.charAt(start)))
                        .append(fullName.substring(start+1,offset));
            }
            packageName = buf.toString();
        }
        Ruby runtime = proxyClass.getRuntime();
        RubyModule javaModule = runtime.getModule("Java");
        IRubyObject packageModule = javaModule.getConstantAt(packageName);
        if (packageModule == null) {
            String packageString = endPackage < 0 ? "" : fullName.substring(0,endPackage);
            packageModule = createPackageModule(javaModule,packageName,packageString);
        } else if (!(packageModule instanceof RubyModule)) {
            return;
        }
        String className = fullName.substring(endPackage + 1);
        if (((RubyModule)packageModule).getConstantAt(className) == null) {
            ((RubyModule)packageModule).const_set(runtime.newSymbol(className),proxyClass);
        }
    }

    private static RubyModule createPackageModule(RubyModule parent, String name, String packageString) {
        Ruby runtime = parent.getRuntime();
        RubyModule packageModule = (RubyModule)runtime.getModule("JavaPackageModuleTemplate").dup();
        packageModule.setInstanceVariable("@package_name",runtime.newString(
                packageString.length() > 0 ? packageString + '.' : packageString));
        parent.const_set(runtime.newSymbol(name),packageModule);
        return packageModule;
    }
    
    private static final Pattern CAMEL_CASE_PACKAGE_SPLITTER = Pattern.compile("([a-z])([A-Z])");        

    public static IRubyObject get_package_module(IRubyObject recv, IRubyObject symObject) {
        String sym = symObject.asSymbol();
        RubyModule javaModule = recv.getRuntime().getModule("Java");
        IRubyObject value;
        if ((value = javaModule.getConstantAt(sym)) != null) {
            return value;
        }
        String packageName;
        if ("Default".equals(sym)) {
            packageName = "";
        } else {
            Matcher m = CAMEL_CASE_PACKAGE_SPLITTER.matcher(sym);
            packageName = m.replaceAll("$1.$2").toLowerCase();
        }
        return createPackageModule(javaModule,sym,packageName);
    }
    
    public static IRubyObject matching_method(IRubyObject recv, IRubyObject methods, IRubyObject args) {
        Map matchCache = ((ProxyData)recv.dataGetStruct()).matchCache;

        List arg_types = new ArrayList();
        int alen = ((RubyArray)args).getLength();
        IRubyObject[] aargs = ((RubyArray)args).toJavaArrayMaybeUnsafe();
        for(int i=0;i<alen;i++) {
            arg_types.add(((JavaClass)((JavaObject)aargs[i]).java_class()).getValue());
        }

        Map ms = (Map)matchCache.get(methods);
        if(ms == null) {
            ms = new HashMap();
            matchCache.put(methods, ms);
        } else {
            IRubyObject method = (IRubyObject)ms.get(arg_types);
            if(method != null) {
                return method;
            }
        }

        int mlen = ((RubyArray)methods).getLength();
        IRubyObject[] margs = ((RubyArray)methods).toJavaArrayMaybeUnsafe();

        for(int i=0;i<2;i++) {
            for(int k=0;k<mlen;k++) {
                List types = null;
                IRubyObject method = margs[k];
                if(method instanceof JavaCallable) {
                    types = java.util.Arrays.asList(((JavaCallable)method).parameterTypes());
                } else if(method instanceof JavaProxyMethod) {
                    types = java.util.Arrays.asList(((JavaProxyMethod)method).getParameterTypes());
                } else if(method instanceof JavaProxyConstructor) {
                    types = java.util.Arrays.asList(((JavaProxyConstructor)method).getParameterTypes());
                }

                // Compatible (by inheritance)
                if(arg_types.size() == types.size()) {
                    // Exact match
                    if(types.equals(arg_types)) {
                        ms.put(arg_types, method);
                        return method;
                    }

                    boolean match = true;
                    for(int j=0; j<types.size(); j++) {
                        if(!(
                             JavaClass.assignable((Class)types.get(j),(Class)arg_types.get(j)) &&
                             (i > 0 || primitive_match(types.get(j),arg_types.get(j)))
                             )) {
                            match = false;
                            break;
                        }
                    }
                    if(match) {
                        ms.put(arg_types, method);
                        return method;
                    }
                } // Could check for varargs here?
            }
        }

        Object o1 = margs[0];

        if(o1 instanceof JavaConstructor || o1 instanceof JavaProxyConstructor) {
            throw recv.getRuntime().newNameError("no constructor with arguments matching " + arg_types + " on object " + recv.callMethod(recv.getRuntime().getCurrentContext(),"inspect"), null);
        } else {
            throw recv.getRuntime().newNameError("no " + ((JavaMethod)o1).name() + " with arguments matching " + arg_types + " on object " + recv.callMethod(recv.getRuntime().getCurrentContext(),"inspect"), null);
        }
    }

    public static IRubyObject matching_method_internal(IRubyObject recv, IRubyObject methods, IRubyObject[] args, int start, int len) {
        Map matchCache = ((ProxyData)recv.dataGetStruct()).matchCache;

        List arg_types = new ArrayList();
        int aend = start+len;

        for(int i=start;i<aend;i++) {
            arg_types.add(((JavaClass)((JavaObject)args[i]).java_class()).getValue());
        }

        Map ms = (Map)matchCache.get(methods);
        if(ms == null) {
            ms = new HashMap();
            matchCache.put(methods, ms);
        } else {
            IRubyObject method = (IRubyObject)ms.get(arg_types);
            if(method != null) {
                return method;
            }
        }

        int mlen = ((RubyArray)methods).getLength();
        IRubyObject[] margs = ((RubyArray)methods).toJavaArrayMaybeUnsafe();

        mfor: for(int k=0;k<mlen;k++) {
            Class[] types = null;
            IRubyObject method = margs[k];
            if(method instanceof JavaCallable) {
                types = ((JavaCallable)method).parameterTypes();
            } else if(method instanceof JavaProxyMethod) {
                types = ((JavaProxyMethod)method).getParameterTypes();
            } else if(method instanceof JavaProxyConstructor) {
                types = ((JavaProxyConstructor)method).getParameterTypes();
            }
            // Compatible (by inheritance)
            if(len == types.length) {
                // Exact match
                boolean same = true;
                for(int x=0,y=len;x<y;x++) {
                    if(!types[x].equals(arg_types.get(x))) {
                        same = false;
                        break;
                    }
                }
                if(same) {
                    ms.put(arg_types, method);
                    return method;
                }
                
                for(int j=0,m=len; j<m; j++) {
                    if(!(
                         JavaClass.assignable(types[j],(Class)arg_types.get(j)) &&
                         primitive_match(types[j],arg_types.get(j))
                         )) {
                        continue mfor;
                    }
                }
                ms.put(arg_types, method);
                return method;
            }
        }

        mfor: for(int k=0;k<mlen;k++) {
            Class[] types = null;
            IRubyObject method = margs[k];
            if(method instanceof JavaCallable) {
                types = ((JavaCallable)method).parameterTypes();
            } else if(method instanceof JavaProxyMethod) {
                types = ((JavaProxyMethod)method).getParameterTypes();
            } else if(method instanceof JavaProxyConstructor) {
                types = ((JavaProxyConstructor)method).getParameterTypes();
            }
            // Compatible (by inheritance)
            if(len == types.length) {
                for(int j=0,m=len; j<m; j++) {
                    if(!JavaClass.assignable(types[j],(Class)arg_types.get(j))) {
                        continue mfor;
                    }
                }
                ms.put(arg_types, method);
                return method;
            }
        }

        Object o1 = margs[0];

        if(o1 instanceof JavaConstructor || o1 instanceof JavaProxyConstructor) {
            throw recv.getRuntime().newNameError("no constructor with arguments matching " + arg_types + " on object " + recv.callMethod(recv.getRuntime().getCurrentContext(),"inspect"), null);
        } else {
            throw recv.getRuntime().newNameError("no " + ((JavaMethod)o1).name() + " with arguments matching " + arg_types + " on object " + recv.callMethod(recv.getRuntime().getCurrentContext(),"inspect"), null);
        }
    }

    public static IRubyObject access(IRubyObject recv, IRubyObject java_type) {
        int modifiers = ((JavaClass)java_type).javaClass().getModifiers();
        return recv.getRuntime().newString(Modifier.isPublic(modifiers) ? "public" : (Modifier.isProtected(modifiers) ? "protected" : "private"));
    }

    public static IRubyObject valid_constant_name_p(IRubyObject recv, IRubyObject name) {
        RubyString sname = name.convertToString();
        if(sname.getByteList().length() == 0) {
            return recv.getRuntime().getFalse();
        }
        return Character.isUpperCase(sname.getByteList().charAt(0)) ? recv.getRuntime().getTrue() : recv.getRuntime().getFalse();
    }

    public static boolean primitive_match(Object v1, Object v2) {
        if(((Class)v1).isPrimitive()) {
            if(v1 == Integer.TYPE || v1 == Long.TYPE || v1 == Short.TYPE || v1 == Character.TYPE) {
                return v2 == Integer.class ||
                    v2 == Long.class ||
                    v2 == Short.class ||
                    v2 == Character.class;
            } else if(v1 == Float.TYPE || v1 == Double.TYPE) {
                return v2 == Float.class ||
                    v2 == Double.class;
            } else if(v1 == Boolean.TYPE) {
                return v2 == Boolean.class;
            }
            return false;
        }
        return true;
    }

    public static IRubyObject primitive_match(IRubyObject recv, IRubyObject t1, IRubyObject t2) {
        if(((JavaClass)t1).primitive_p().isTrue()) {
            Object v1 = ((JavaObject)t1).getValue();
            Object v2 = ((JavaObject)t2).getValue();
            return primitive_match(v1,v2) ? recv.getRuntime().getTrue() : recv.getRuntime().getFalse();
        }
        return recv.getRuntime().getTrue();
    }

    public static IRubyObject wrap(IRubyObject recv, IRubyObject java_object) {
        return new_instance_for(get_proxy_class(recv, ((JavaObject)java_object).java_class()),java_object);
    }

      // Java methods
    public static IRubyObject define_exception_handler(IRubyObject recv, IRubyObject[] args, Block block) {
        String name = args[0].toString();
        RubyProc handler = null;
        if (args.length > 1) {
            handler = (RubyProc)args[1];
        } else {
            handler = recv.getRuntime().newProc(false, block);
        }
        recv.getRuntime().getJavaSupport().defineExceptionHandler(name, handler);

        return recv;
    }

    public static IRubyObject primitive_to_java(IRubyObject recv, IRubyObject object, Block unusedBlock) {
        if (object instanceof JavaObject) {
            return object;
        }
        Ruby runtime = recv.getRuntime();
        Object javaObject;
        switch (object.getMetaClass().index) {
        case ClassIndex.NIL:
            javaObject = null;
            break;
        case ClassIndex.FIXNUM:
            javaObject = new Long(((RubyFixnum) object).getLongValue());
            break;
        case ClassIndex.BIGNUM:
            javaObject = ((RubyBignum) object).getValue();
            break;
        case ClassIndex.FLOAT:
            javaObject = new Double(((RubyFloat) object).getValue());
            break;
        case ClassIndex.STRING:
            try {
                ByteList bytes = ((RubyString) object).getByteList();
                javaObject = new String(bytes.unsafeBytes(), bytes.begin(), bytes.length(), "UTF8");
            } catch (UnsupportedEncodingException uee) {
                javaObject = object.toString();
            }
            break;
        case ClassIndex.TRUE:
            javaObject = Boolean.TRUE;
            break;
        case ClassIndex.FALSE:
            javaObject = Boolean.FALSE;
            break;
        default:
            if (object instanceof RubyTime) {
                javaObject = ((RubyTime)object).getJavaDate();
            } else {
                javaObject = object;
            }
        }
        return JavaObject.wrap(runtime, javaObject);
    }

    /**
     * High-level object conversion utility function 'java_to_primitive' is the low-level version 
     */
    public static IRubyObject java_to_ruby(IRubyObject recv, IRubyObject object, Block unusedBlock) {
        if(object instanceof JavaObject) {
            object = JavaUtil.convertJavaToRuby(recv.getRuntime(), ((JavaObject) object).getValue());

            //if (object.isKindOf(recv.getRuntime().getModule("Java").getClass("JavaObject"))) {
            if(object instanceof JavaObject) {
                return wrap(recv.getRuntime().getModule("JavaUtilities"), object);
            }
        }

            return object;
    }

    // TODO: Formalize conversion mechanisms between Java and Ruby
    /**
     * High-level object conversion utility. 
     */
    public static IRubyObject ruby_to_java(final IRubyObject recv, IRubyObject object, Block unusedBlock) {
      if(object.respondsTo("to_java_object")) {
            IRubyObject result = object.getInstanceVariable("@java_object");
            if(result == null) {
                result = object.callMethod(recv.getRuntime().getCurrentContext(), "to_java_object");
            }
            return result;
      }
      
      return primitive_to_java(recv, object, unusedBlock);
    }    

    public static IRubyObject java_to_primitive(IRubyObject recv, IRubyObject object, Block unusedBlock) {
        if (object instanceof JavaObject) {
            return JavaUtil.convertJavaToRuby(recv.getRuntime(), ((JavaObject) object).getValue());
        }

            return object;
    }

    public static IRubyObject new_proxy_instance(final IRubyObject recv, IRubyObject[] args, Block block) {
      int size = Arity.checkArgumentCount(recv.getRuntime(), args, 1, -1) - 1;
      final RubyProc proc;

      // Is there a supplied proc argument or do we assume a block was supplied
      if (args[size] instanceof RubyProc) {
            proc = (RubyProc) args[size];
      } else {
            proc = recv.getRuntime().newProc(false, block);
            size++;
      }
      
      // Create list of interfaces to proxy (and make sure they really are interfaces)
        Class[] interfaces = new Class[size];
        for (int i = 0; i < size; i++) {
            if (!(args[i] instanceof JavaClass) || !((JavaClass)args[i]).interface_p().isTrue()) {
                throw recv.getRuntime().newArgumentError("Java interface expected. got: " + args[i]);
            }
            interfaces[i] = ((JavaClass) args[i]).javaClass();
        }
        
        return JavaObject.wrap(recv.getRuntime(), Proxy.newProxyInstance(recv.getRuntime().getJavaSupport().getJavaClassLoader(), interfaces, new InvocationHandler() {
            private Map parameterTypeCache = new HashMap();
            public Object invoke(Object proxy, Method method, Object[] nargs) throws Throwable {
                Class[] parameterTypes = (Class[])parameterTypeCache.get(method);
                if (parameterTypes == null) {
                    parameterTypes = method.getParameterTypes();
                    parameterTypeCache.put(method, parameterTypes);
                }
                  int methodArgsLength = parameterTypes.length;
                  String methodName = method.getName();
                  
                if (methodName.equals("toString") && methodArgsLength == 0) {
                    return proxy.getClass().getName();
                } else if (methodName.equals("hashCode") && methodArgsLength == 0) {
                    return new Integer(proxy.getClass().hashCode());
                } else if (methodName.equals("equals") && methodArgsLength == 1 && parameterTypes[0].equals(Object.class)) {
                    return Boolean.valueOf(proxy == nargs[0]);
                }
                int length = nargs == null ? 0 : nargs.length;
                IRubyObject[] rubyArgs = new IRubyObject[length + 2];
                rubyArgs[0] = JavaObject.wrap(recv.getRuntime(), proxy);
                rubyArgs[1] = new JavaMethod(recv.getRuntime(), method);
                for (int i = 0; i < length; i++) {
                    rubyArgs[i + 2] = JavaObject.wrap(recv.getRuntime(), nargs[i]);
                }
                return JavaUtil.convertArgument(proc.call(rubyArgs), method.getReturnType());
            }
        }));
    }
}

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