/***** 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
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* rights and limitations under the License.
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* Copyright (c) 2007 Peter Brant <peter.brant@gmail.com>
*
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* 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"),
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package org.jruby.internal.runtime.methods;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.jruby.Ruby;
import org.jruby.RubyModule;
import org.jruby.RubyString;
import org.jruby.anno.JRubyMethod;
import org.jruby.exceptions.RaiseException;
import org.jruby.runtime.Arity;
import org.jruby.runtime.Block;
import org.jruby.runtime.RubyEvent;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
public class ReflectedJavaMethod extends JavaMethod {
private final Method method;
private final boolean needsBlock;
private final boolean isStatic;
private final int required;
private final int optional;
private final boolean rest;
private final int max;
private final boolean argsAsIs;
private final boolean needsThreadContext;
public ReflectedJavaMethod(
RubyModule implementationClass, Method method, JRubyMethod annotation) {
super(implementationClass, annotation.visibility());
this.method = method;
Class<?>[] params = method.getParameterTypes();
this.needsBlock = params.length > 0 && params[params.length - 1] == Block.class;
this.isStatic = Modifier.isStatic(method.getModifiers());
Arity arity = Arity.fromAnnotation(annotation, params, this.isStatic);
setArity(arity);
this.required = arity.getValue() >= 0 ? arity.getValue() : Math.abs(arity.getValue())-1;
this.optional = annotation.optional();
this.rest = annotation.rest();
this.needsThreadContext = params.length > 0 && params[0] == ThreadContext.class;
this.argsAsIs = ! isStatic && optional == 0 && !rest && !needsBlock && !needsThreadContext;
if (rest) {
max = -1;
} else {
max = required + optional;
}
}
@Override
public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name,
IRubyObject[] args, Block block) {
Ruby runtime = context.runtime;
Arity.checkArgumentCount(runtime, name, args, required, max);
callConfig.pre(context, self, getImplementationClass(), name, block, null);
try {
if (! isStatic && ! method.getDeclaringClass().isAssignableFrom(self.getClass())) {
throw new ClassCastException(
self.getClass().getName() + " cannot be converted to " +
method.getDeclaringClass().getName());
}
if (argsAsIs) {
boolean isTrace = runtime.hasEventHooks();
try {
if (isTrace) {
runtime.callEventHooks(context, RubyEvent.C_CALL, context.getFile(), context.getLine(), name, getImplementationClass());
}
return (IRubyObject)method.invoke(self, (Object[])args);
} finally {
if (isTrace) {
runtime.callEventHooks(context, RubyEvent.C_RETURN, context.getFile(), context.getLine(), name, getImplementationClass());
}
}
} else {
int argsLength = calcArgsLength();
Object[] params = new Object[argsLength];
int offset = 0;
if (needsThreadContext) {
params[offset++] = context;
}
if (isStatic) {
params[offset++] = self;
}
if (required < 4 && optional == 0 && !rest) {
for (int i = 0; i < args.length; i++) {
if (method.getParameterTypes()[offset] == RubyString.class) {
params[offset++] = args[i].convertToString();
} else {
params[offset++] = args[i];
}
}
} else {
params[offset++] = args;
}
if (needsBlock) {
params[offset++] = block;
}
boolean isTrace = runtime.hasEventHooks();
try {
if (isTrace) {
runtime.callEventHooks(context, RubyEvent.C_CALL, context.getFile(), context.getLine(), name, getImplementationClass());
}
IRubyObject result;
if (isStatic) {
result = (IRubyObject)method.invoke(null, params);
} else {
result = (IRubyObject)method.invoke(self, params);
}
return result == null ? runtime.getNil() : result;
} finally {
if (isTrace) {
runtime.callEventHooks(context, RubyEvent.C_RETURN, context.getFile(), context.getLine(), name, getImplementationClass());
}
}
}
} catch (IllegalArgumentException e) {
throw RaiseException.createNativeRaiseException(runtime, e, method);
} catch (IllegalAccessException e) {
throw RaiseException.createNativeRaiseException(runtime, e, method);
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
if (cause instanceof RuntimeException) {
throw (RuntimeException)cause;
} else if (cause instanceof Error) {
throw (Error)cause;
} else {
throw RaiseException.createNativeRaiseException(runtime, cause, method);
}
} finally {
callConfig.post(context);
}
}
private int calcArgsLength() {
int argsLength = 0;
if (needsThreadContext) {
argsLength++;
}
if (isStatic) {
argsLength++;
}
if (required < 4 && optional == 0 && !rest) {
argsLength += required;
} else {
argsLength++;
}
if (needsBlock) {
argsLength++;
}
return argsLength;
}
}