src/org/jruby/javasupport/proxy/JavaProxyConstructor.java

   1 /***** BEGIN LICENSE BLOCK *****
   2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Common Public
   5  * License Version 1.0 (the "License"); you may not use this file
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  10  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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  14  * Copyright (C) 2006 Kresten Krab Thorup <krab@gnu.org>
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  17  * either of the GNU General Public License Version 2 or later (the "GPL"),
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  28
  29 package org.jruby.javasupport.proxy;
  30
  31 import java.lang.reflect.Constructor;
  32 import java.lang.reflect.InvocationTargetException;
  33
  34 import org.jruby.Ruby;
  35 import org.jruby.RubyArray;
  36 import org.jruby.RubyClass;
  37 import org.jruby.RubyFixnum;
  38 import org.jruby.RubyModule;
  39 import org.jruby.RubyObject;
  40 import org.jruby.RubyProc;
  41 import org.jruby.anno.JRubyMethod;
  42 import org.jruby.exceptions.RaiseException;
  43 import org.jruby.internal.runtime.methods.DynamicMethod;
  44 import org.jruby.javasupport.Java;
  45 import org.jruby.javasupport.JavaObject;
  46 import org.jruby.javasupport.JavaUtil;
  47 import org.jruby.javasupport.ParameterTypes;
  48 import org.jruby.javasupport.util.RuntimeHelpers;
  49 import org.jruby.runtime.Arity;
  50 import org.jruby.runtime.Block;
  51 import org.jruby.runtime.CallType;
  52 import org.jruby.runtime.ObjectAllocator;
  53 import org.jruby.runtime.builtin.IRubyObject;
  54
  55 public class JavaProxyConstructor extends JavaProxyReflectionObject implements ParameterTypes {
  56
  57     private final Constructor<?> proxyConstructor;
  58     private final Class<?>[] apparentParameterTypes;
  59
  60     private final JavaProxyClass declaringProxyClass;
  61
  62     JavaProxyConstructor(Ruby runtime, JavaProxyClass pClass,
  63             Constructor<?> constructor) {
  64         super(runtime, runtime.getJavaSupport().getJavaModule().fastGetClass(
  65                 "JavaProxyConstructor"));
  66         this.declaringProxyClass = pClass;
  67         this.proxyConstructor = constructor;
  68         Class<?>[] parameterTypes = constructor.getParameterTypes();
  69         int len = parameterTypes.length - 1;
  70         this.apparentParameterTypes = new Class<?>[len];
  71         System.arraycopy(parameterTypes, 0, apparentParameterTypes, 0, len);
  72     }
  73
  74     public Class<?>[] getParameterTypes() {
  75         return apparentParameterTypes;
  76     }
  77
  78     public Class<?>[] getExceptionTypes() {
  79         return proxyConstructor.getExceptionTypes();
  80     }
  81
  82     public boolean isVarArgs() {
  83         return proxyConstructor.isVarArgs();
  84     }
  85
  86     @JRubyMethod(name = "declaring_class")
  87     public JavaProxyClass getDeclaringClass() {
  88         return declaringProxyClass;
  89     }
  90
  91     public Object newInstance(Object[] args, JavaProxyInvocationHandler handler)
  92             throws IllegalArgumentException, InstantiationException,
  93             IllegalAccessException, InvocationTargetException {
  94         if (args.length != apparentParameterTypes.length) {
  95             throw new IllegalArgumentException("wrong number of parameters");
  96         }
  97
  98         Object[] realArgs = new Object[args.length + 1];
  99         System.arraycopy(args, 0, realArgs, 0, args.length);
 100         realArgs[args.length] = handler;
 101
 102         return proxyConstructor.newInstance(realArgs);
 103     }
 104
 105     public static RubyClass createJavaProxyConstructorClass(Ruby runtime,
 106             RubyModule javaProxyModule) {
 107         RubyClass result = javaProxyModule.defineClassUnder("JavaProxyConstructor",
 108                 runtime.getObject(), ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);
 109
 110         JavaProxyReflectionObject.registerRubyMethods(runtime, result);
 111
 112         result.defineAnnotatedMethods(JavaProxyConstructor.class);
 113
 114         return result;
 115
 116     }
 117
 118     @JRubyMethod
 119     public RubyFixnum arity() {
 120         return getRuntime().newFixnum(getParameterTypes().length);
 121     }
 122
 123     public boolean equals(Object other) {
 124         return other instanceof JavaProxyConstructor &&
 125             this.proxyConstructor == ((JavaProxyConstructor)other).proxyConstructor;
 126     }
 127
 128     public int hashCode() {
 129         return proxyConstructor.hashCode();
 130     }
 131
 132     protected String nameOnInspection() {
 133         return getDeclaringClass().nameOnInspection();
 134     }
 135
 136     public IRubyObject inspect() {
 137         StringBuilder result = new StringBuilder();
 138         result.append(nameOnInspection());
 139         Class<?>[] parameterTypes = getParameterTypes();
 140         for (int i = 0; i < parameterTypes.length; i++) {
 141             result.append(parameterTypes[i].getName());
 142             if (i < parameterTypes.length - 1) {
 143                 result.append(',');
 144             }
 145         }
 146         result.append(")>");
 147         return getRuntime().newString(result.toString());
 148     }
 149
 150     @JRubyMethod
 151     public RubyArray argument_types() {
 152         return buildRubyArray(getParameterTypes());
 153     }
 154
 155     @JRubyMethod(frame = true, rest = true)
 156     public RubyObject new_instance2(IRubyObject[] args, Block unusedBlock) {
 157         Arity.checkArgumentCount(getRuntime(), args, 2, 2);
 158
 159         final IRubyObject self = args[0];
 160         final Ruby runtime = self.getRuntime();
 161         final RubyModule javaUtilities = runtime.getJavaSupport().getJavaUtilitiesModule();
 162         RubyArray constructor_args = (RubyArray) args[1];
 163         Class<?>[] parameterTypes = getParameterTypes();
 164         int count = (int) constructor_args.length().getLongValue();
 165         Object[] converted = new Object[count];
 166
 167         for (int i = 0; i < count; i++) {
 168             // TODO: call ruby method
 169             IRubyObject ith = constructor_args.aref(getRuntime().newFixnum(i));
 170             converted[i] = JavaUtil.convertArgument(getRuntime(), Java.ruby_to_java(this, ith, Block.NULL_BLOCK), parameterTypes[i]);
 171         }
 172
 173         JavaProxyInvocationHandler handler = new JavaProxyInvocationHandler() {
 174             public Object invoke(Object proxy, JavaProxyMethod m, Object[] nargs) throws Throwable {
 175                 String name = m.getName();
 176                 DynamicMethod method = self.getMetaClass().searchMethod(name);
 177                 int v = method.getArity().getValue();
 178                 IRubyObject[] newArgs = new IRubyObject[nargs.length];
 179                 for (int i = nargs.length; --i >= 0; ) {
 180                     newArgs[i] = Java.java_to_ruby(
 181                             javaUtilities,
 182                             JavaObject.wrap(runtime, nargs[i]),
 183                             Block.NULL_BLOCK);
 184                 }
 185
 186                 if (v < 0 || v == (newArgs.length)) {
 187                     return JavaUtil.convertRubyToJava(RuntimeHelpers.invoke(runtime.getCurrentContext(), self, name, newArgs), m.getReturnType());
 188                 } else {
 189                     RubyClass superClass = self.getMetaClass().getSuperClass();
 190                     return JavaUtil.convertRubyToJava(RuntimeHelpers.invokeAs(runtime.getCurrentContext(), superClass, self, name, newArgs, CallType.SUPER, Block.NULL_BLOCK), m.getReturnType());
 191                 }
 192             }
 193         };
 194
 195         try {
 196             return JavaObject.wrap(getRuntime(), newInstance(converted, handler));
 197         } catch (Exception e) {
 198             RaiseException ex = getRuntime().newArgumentError(
 199                     "Constructor invocation failed: " + e.getMessage());
 200             ex.initCause(e);
 201             throw ex;
 202         }
 203     }
 204
 205     @JRubyMethod(required = 1, optional = 1, frame = true)
 206     public RubyObject new_instance(IRubyObject[] args, Block block) {
 207         int size = Arity.checkArgumentCount(getRuntime(), args, 1, 2) - 1;
 208         final RubyProc proc;
 209
 210         // Is there a supplied proc argument or do we assume a block was
 211         // supplied
 212         if (args[size] instanceof RubyProc) {
 213             proc = (RubyProc) args[size];
 214         } else {
 215             proc = getRuntime().newProc(Block.Type.PROC,block);
 216             size++;
 217         }
 218
 219         RubyArray constructor_args = (RubyArray) args[0];
 220         Class<?>[] parameterTypes = getParameterTypes();
 221
 222         int count = (int) constructor_args.length().getLongValue();
 223         Object[] converted = new Object[count];
 224         for (int i = 0; i < count; i++) {
 225             // TODO: call ruby method
 226             IRubyObject ith = constructor_args.aref(getRuntime().newFixnum(i));
 227             converted[i] = JavaUtil.convertArgument(getRuntime(), Java.ruby_to_java(this, ith, Block.NULL_BLOCK), parameterTypes[i]);
 228         }
 229
 230         final IRubyObject recv = this;
 231
 232         JavaProxyInvocationHandler handler = new JavaProxyInvocationHandler() {
 233
 234             public Object invoke(Object proxy, JavaProxyMethod method,
 235                     Object[] nargs) throws Throwable {
 236                 int length = nargs == null ? 0 : nargs.length;
 237                 IRubyObject[] rubyArgs = new IRubyObject[length + 2];
 238                 rubyArgs[0] = JavaObject.wrap(recv.getRuntime(), proxy);
 239                 rubyArgs[1] = method;
 240                 for (int i = 0; i < length; i++) {
 241                     rubyArgs[i + 2] = JavaUtil.convertJavaToRuby(getRuntime(),
 242                             nargs[i]);
 243                 }
 244                 IRubyObject call_result = proc.call(getRuntime().getCurrentContext(), rubyArgs);
 245                 Object converted_result = JavaUtil.convertRubyToJava(
 246                         call_result, method.getReturnType());
 247                 return converted_result;
 248             }
 249
 250         };
 251
 252         Object result;
 253         try {
 254             result = newInstance(converted, handler);
 255         } catch (Exception e) {
 256             RaiseException ex = getRuntime().newArgumentError(
 257                     "Constructor invocation failed: " + e.getMessage());
 258             ex.initCause(e);
 259             throw ex;
 260         }
 261
 262         return JavaObject.wrap(getRuntime(), result);
 263
 264     }
 265
 266 }