/*

  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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  */

 package java.lang.invoke;

 import java.security.*;

 import java.lang.reflect.*;

 import java.lang.invoke.MethodHandleNatives.Constants;

 import java.lang.invoke.MethodHandles.Lookup;

 import static java.lang.invoke.MethodHandleStatics.*;

 /*

  * Auxiliary to MethodHandleInfo, wants to nest in MethodHandleInfo but must be non-public.

  */

 /*non-public*/

 final

 class InfoFromMemberName implements MethodHandleInfo {

     private final MemberName member;

     private final int referenceKind;

     InfoFromMemberName(Lookup lookup, MemberName member, byte referenceKind) {

         assert(member.isResolved() || member.isMethodHandleInvoke());

         assert(member.referenceKindIsConsistentWith(referenceKind));

         this.member = member;

         this.referenceKind = referenceKind;

     }

     @Override

     public Class<?> getDeclaringClass() {

         return member.getDeclaringClass();

     }

     @Override

     public String getName() {

         return member.getName();

     }

     @Override

     public MethodType getMethodType() {

         return member.getMethodOrFieldType();

     }

     @Override

     public int getModifiers() {

         return member.getModifiers();

     }

     @Override

     public int getReferenceKind() {

         return referenceKind;

     }

     @Override

     public String toString() {

         return MethodHandleInfo.toString(getReferenceKind(), getDeclaringClass(), getName(), getMethodType());

     }

     @Override

     public <T extends Member> T reflectAs(Class<T> expected, Lookup lookup) {

         if (member.isMethodHandleInvoke() && !member.isVarargs()) {

             // This member is an instance of a signature-polymorphic method, which cannot be reflected

             // A method handle invoker can come in either of two forms:

             // A generic placeholder (present in the source code, and varargs)

             // and a signature-polymorphic instance (synthetic and not varargs).

             // For more information see comments on {@link MethodHandleNatives#linkMethod}.

             throw new IllegalArgumentException("cannot reflect signature polymorphic method");

         }

         Member mem = AccessController.doPrivileged(new PrivilegedAction<Member>() {

                 public Member run() {

                     try {

                         return reflectUnchecked();

                     } catch (ReflectiveOperationException ex) {

                         throw new IllegalArgumentException(ex);

                     }

                 }

             });

         try {

             Class<?> defc = getDeclaringClass();

             byte refKind = (byte) getReferenceKind();

             lookup.checkAccess(refKind, defc, convertToMemberName(refKind, mem));

         } catch (IllegalAccessException ex) {

             throw new IllegalArgumentException(ex);

         }

         return expected.cast(mem);

     }

     private Member reflectUnchecked() throws ReflectiveOperationException {

         byte refKind = (byte) getReferenceKind();

         Class<?> defc = getDeclaringClass();

         boolean isPublic = Modifier.isPublic(getModifiers());

         if (MethodHandleNatives.refKindIsMethod(refKind)) {

             if (isPublic)

                 return defc.getMethod(getName(), getMethodType().parameterArray());

             else

                 return defc.getDeclaredMethod(getName(), getMethodType().parameterArray());

         } else if (MethodHandleNatives.refKindIsConstructor(refKind)) {

             if (isPublic)

                 return defc.getConstructor(getMethodType().parameterArray());

             else

                 return defc.getDeclaredConstructor(getMethodType().parameterArray());

         } else if (MethodHandleNatives.refKindIsField(refKind)) {

             if (isPublic)

                 return defc.getField(getName());

             else

                 return defc.getDeclaredField(getName());

         } else {

             throw new IllegalArgumentException("referenceKind="+refKind);

         }

     }

     private static MemberName convertToMemberName(byte refKind, Member mem) throws IllegalAccessException {

         if (mem instanceof Method) {

             boolean wantSpecial = (refKind == REF_invokeSpecial);

             return new MemberName((Method) mem, wantSpecial);

         } else if (mem instanceof Constructor) {

             return new MemberName((Constructor) mem);

         } else if (mem instanceof Field) {

             boolean isSetter = (refKind == REF_putField || refKind == REF_putStatic);

             return new MemberName((Field) mem, isSetter);

         }

         throw new InternalError(mem.getClass().getName());

     }

 }