BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
License Version 2.0 (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/epl-v20.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) 2001 Chad Fowler 
Copyright (C) 2001 Alan Moore 
Copyright (C) 2001-2004 Jan Arne Petersen 
Copyright (C) 2002 Benoit Cerrina 
Copyright (C) 2002-2004 Anders Bengtsson 
Copyright (C) 2004 Stefan Matthias Aust 
Copyright (C) 2004 Thomas E Enebo 
Copyright (C) 2004 David Corbin 
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 EPL, 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 EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (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/epl-v20.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) 2001 Chad Fowler <chadfowler@chadfowler.com>
 * Copyright (C) 2001 Alan Moore <alan_moore@gmx.net>
 * Copyright (C) 2001-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
 * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
 * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
 * Copyright (C) 2004 David Corbin <dcorbin@users.sourceforge.net>
 *
 * 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 EPL, 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 EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.javasupport;

import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;

import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyModule;
import org.jruby.RubyString;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

@JRubyClass(name="Java::JavaConstructor")
public class JavaConstructor extends JavaCallable {

    private final Constructor<?> constructor;
    //private final JavaUtil.JavaConverter objectConverter;

    public final Constructor getValue() { return constructor; }

    public static RubyClass createJavaConstructorClass(Ruby runtime, RubyModule javaModule) {
        // TODO: NOT_ALLOCATABLE_ALLOCATOR is probably ok here, since we don't intend for people to monkey with
        // this type and it can't be marshalled. Confirm. JRUBY-415
        RubyClass result =
                javaModule.defineClassUnder("JavaConstructor", runtime.getObject(), ObjectAllocator.NOT_ALLOCATABLE_ALLOCATOR);

        JavaAccessibleObject.registerRubyMethods(runtime, result);
        JavaCallable.registerRubyMethods(runtime, result);

        result.defineAnnotatedMethods(JavaConstructor.class);

        return result;
    }

    public JavaConstructor(Ruby runtime, Constructor<?> constructor) {
        super(runtime, runtime.getJavaSupport().getJavaConstructorClass(), constructor.getParameterTypes());
        this.constructor = constructor;
        //this.objectConverter = JavaUtil.getJavaConverter(constructor.getDeclaringClass());
    }

    public static JavaConstructor create(Ruby runtime, Constructor<?> constructor) {
        return new JavaConstructor(runtime, constructor);
    }

    public static JavaConstructor getMatchingConstructor(final Ruby runtime,
        final Class<?> javaClass, final Class<?>[] argumentTypes) {
        try {
            return create(runtime, javaClass.getConstructor(argumentTypes));
        }
        catch (NoSuchMethodException e) {
            final int argLength = argumentTypes.length;
            // Java reflection does not allow retrieving constructors like methods
            Search: for (Constructor<?> ctor : javaClass.getConstructors()) {
                final Class<?>[] ctorTypes = ctor.getParameterTypes();
                final int ctorLength = ctorTypes.length;

                if ( ctorLength != argLength ) continue Search;
                // for zero args case we can stop searching
                if ( ctorLength == 0 && argLength == 0 ) {
                    return create(runtime, ctor);
                }

                boolean found = true;
                TypeScan: for ( int i = 0; i < argLength; i++ ) {
                    //if ( i >= ctorLength ) found = false;
                    if ( ctorTypes[i].isAssignableFrom(argumentTypes[i]) ) {
                        found = true; // continue TypeScan;
                    } else {
                        continue Search; // not-found
                    }
                }

                // if we get here, we found a matching method, use it
                // TODO: choose narrowest method by continuing to search
                if ( found ) return create(runtime, ctor);
            }
        }
        return null; // no matching ctor found
    }

    @Override
    public final boolean equals(Object other) {
        return other instanceof JavaConstructor &&
            this.constructor.equals( ((JavaConstructor) other).constructor );
    }

    @Override
    public final int hashCode() {
        return constructor.hashCode();
    }

    @Override // not-used
    protected String nameOnInspection() {
        return getType().toString();
    }

    @JRubyMethod
    public RubyString inspect() {
        StringBuilder str = new StringBuilder();
        str.append("#<");
        str.append( getType().toString() );
        inspectParameterTypes(str, this);
        str.append('>');
        return RubyString.newString(getRuntime(), str);
    }

    //@Override
    //public final int getArity() {
    //    return parameterTypes.length;
    //}

    //@Override
    //public final Class<?>[] getParameterTypes() {
    //    return parameterTypes;
    //}

    @Override
    public final Class<?>[] getExceptionTypes() {
        return constructor.getExceptionTypes();
    }

    @Override
    public Type[] getGenericParameterTypes() {
        return constructor.getGenericParameterTypes();
    }

    @Override
    public Type[] getGenericExceptionTypes() {
        return constructor.getGenericExceptionTypes();
    }

    public Annotation[][] getParameterAnnotations() {
        return constructor.getParameterAnnotations();
    }

    @Override
    public final boolean isVarArgs() {
        return constructor.isVarArgs();
    }

    @Override
    public final int getModifiers() {
        return constructor.getModifiers();
    }

    public String toGenericString() {
        return constructor.toGenericString();
    }

    public Class<?> getDeclaringClass() {
        return constructor.getDeclaringClass();
    }

    public AccessibleObject accessibleObject() {
        return constructor;
    }

    @JRubyMethod
    public IRubyObject type_parameters() {
        return Java.getInstance(getRuntime(), constructor.getTypeParameters());
    }

    @JRubyMethod
    public IRubyObject return_type() {
        return getRuntime().getNil();
    }

    @JRubyMethod
    public IRubyObject declaring_class() {
        return JavaClass.get(getRuntime(), getDeclaringClass());
    }

    @JRubyMethod(rest = true)
    public final IRubyObject new_instance(final IRubyObject[] args) {
        checkArity(args.length);

        return newInstanceExactArity( convertArguments(args) );
    }

    public final IRubyObject new_instance(final Object[] arguments) {
        checkArity(arguments.length);

        return newInstanceExactArity(arguments);
    }

    private IRubyObject newInstanceExactArity(Object[] arguments) {
        try {
            Object result = constructor.newInstance(arguments);
            return JavaObject.wrap(getRuntime(), result);
        }
        catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor, false, arguments);
        }
        catch (IllegalAccessException iae) {
            throw getRuntime().newTypeError("illegal access");
        }
        catch (InvocationTargetException ite) {
            getRuntime().getJavaSupport().handleNativeException(ite.getTargetException(), constructor);
            // not reached
            assert false;
            return null;
        }
        catch (InstantiationException ie) {
            throw getRuntime().newTypeError("can't make instance of " + constructor.getDeclaringClass().getName());
        }
    }

    public Object newInstanceDirect(ThreadContext context, Object... arguments) {
        checkArity(arguments.length);

        try {
            return constructor.newInstance(arguments);
        } catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor, arguments);
        } catch (IllegalAccessException iae) {
            return handleIllegalAccessEx(iae, constructor);
        } catch (InvocationTargetException ite) {
            return handleInvocationTargetEx(context, ite);
        } catch (Throwable t) {
            return handleThrowable(context, t);
        }
    }

    public Object newInstanceDirect(ThreadContext context) {
        checkArity(0);

        try {
            return constructor.newInstance();
        } catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor);
        } catch (IllegalAccessException iae) {
            return handleIllegalAccessEx(iae, constructor);
        } catch (InvocationTargetException ite) {
            return handleInvocationTargetEx(context, ite);
        } catch (Throwable t) {
            return handleThrowable(context, t);
        }
    }

    public Object newInstanceDirect(ThreadContext context, Object arg0) {
        checkArity(1);

        try {
            return constructor.newInstance(arg0);
        } catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor, arg0);
        } catch (IllegalAccessException iae) {
            return handleIllegalAccessEx(iae, constructor);
        } catch (InvocationTargetException ite) {
            return handleInvocationTargetEx(context, ite);
        } catch (Throwable t) {
            return handleThrowable(context, t);
        }
    }

    public Object newInstanceDirect(ThreadContext context, Object arg0, Object arg1) {
        checkArity(2);

        try {
            return constructor.newInstance(arg0, arg1);
        } catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor, arg0, arg1);
        } catch (IllegalAccessException iae) {
            return handleIllegalAccessEx(iae, constructor);
        } catch (InvocationTargetException ite) {
            return handleInvocationTargetEx(context, ite);
        } catch (Throwable t) {
            return handleThrowable(context, t);
        }
    }

    public Object newInstanceDirect(ThreadContext context, Object arg0, Object arg1, Object arg2) {
        checkArity(3);

        try {
            return constructor.newInstance(arg0, arg1, arg2);
        } catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor, arg0, arg1, arg2);
        } catch (IllegalAccessException iae) {
            return handleIllegalAccessEx(iae, constructor);
        } catch (InvocationTargetException ite) {
            return handleInvocationTargetEx(context, ite);
        } catch (Throwable t) {
            return handleThrowable(context, t);
        }
    }

    public Object newInstanceDirect(ThreadContext context, Object arg0, Object arg1, Object arg2, Object arg3) {
        checkArity(4);

        try {
            return constructor.newInstance(arg0, arg1, arg2, arg3);
        } catch (IllegalArgumentException iae) {
            return handlelIllegalArgumentEx(iae, constructor, arg0, arg1, arg2, arg3);
        } catch (IllegalAccessException iae) {
            return handleIllegalAccessEx(iae, constructor);
        } catch (InvocationTargetException ite) {
            return handleInvocationTargetEx(context, ite);
        } catch (Throwable t) {
            return handleThrowable(context, t);
        }
    }

    boolean isConstructor() { return true; } // for error message in base class

}