jaroslav@1646: /*
jaroslav@1646:  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
jaroslav@1646:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jaroslav@1646:  *
jaroslav@1646:  * This code is free software; you can redistribute it and/or modify it
jaroslav@1646:  * under the terms of the GNU General Public License version 2 only, as
jaroslav@1646:  * published by the Free Software Foundation.  Oracle designates this
jaroslav@1646:  * particular file as subject to the "Classpath" exception as provided
jaroslav@1646:  * by Oracle in the LICENSE file that accompanied this code.
jaroslav@1646:  *
jaroslav@1646:  * This code is distributed in the hope that it will be useful, but WITHOUT
jaroslav@1646:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jaroslav@1646:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jaroslav@1646:  * version 2 for more details (a copy is included in the LICENSE file that
jaroslav@1646:  * accompanied this code).
jaroslav@1646:  *
jaroslav@1646:  * You should have received a copy of the GNU General Public License version
jaroslav@1646:  * 2 along with this work; if not, write to the Free Software Foundation,
jaroslav@1646:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jaroslav@1646:  *
jaroslav@1646:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jaroslav@1646:  * or visit www.oracle.com if you need additional information or have any
jaroslav@1646:  * questions.
jaroslav@1646:  */
jaroslav@1646: 
jaroslav@1646: package java.lang.invoke;
jaroslav@1646: 
jaroslav@1646: import java.security.*;
jaroslav@1646: import java.lang.reflect.*;
jaroslav@1646: import java.lang.invoke.MethodHandleNatives.Constants;
jaroslav@1646: import java.lang.invoke.MethodHandles.Lookup;
jaroslav@1646: import static java.lang.invoke.MethodHandleStatics.*;
jaroslav@1646: 
jaroslav@1646: /*
jaroslav@1646:  * Auxiliary to MethodHandleInfo, wants to nest in MethodHandleInfo but must be non-public.
jaroslav@1646:  */
jaroslav@1646: /*non-public*/
jaroslav@1646: final
jaroslav@1646: class InfoFromMemberName implements MethodHandleInfo {
jaroslav@1646:     private final MemberName member;
jaroslav@1646:     private final int referenceKind;
jaroslav@1646: 
jaroslav@1646:     InfoFromMemberName(Lookup lookup, MemberName member, byte referenceKind) {
jaroslav@1646:         assert(member.isResolved() || member.isMethodHandleInvoke());
jaroslav@1646:         assert(member.referenceKindIsConsistentWith(referenceKind));
jaroslav@1646:         this.member = member;
jaroslav@1646:         this.referenceKind = referenceKind;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public Class<?> getDeclaringClass() {
jaroslav@1646:         return member.getDeclaringClass();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public String getName() {
jaroslav@1646:         return member.getName();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public MethodType getMethodType() {
jaroslav@1646:         return member.getMethodOrFieldType();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public int getModifiers() {
jaroslav@1646:         return member.getModifiers();
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public int getReferenceKind() {
jaroslav@1646:         return referenceKind;
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public String toString() {
jaroslav@1646:         return MethodHandleInfo.toString(getReferenceKind(), getDeclaringClass(), getName(), getMethodType());
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     @Override
jaroslav@1646:     public <T extends Member> T reflectAs(Class<T> expected, Lookup lookup) {
jaroslav@1646:         if (member.isMethodHandleInvoke() && !member.isVarargs()) {
jaroslav@1646:             // This member is an instance of a signature-polymorphic method, which cannot be reflected
jaroslav@1646:             // A method handle invoker can come in either of two forms:
jaroslav@1646:             // A generic placeholder (present in the source code, and varargs)
jaroslav@1646:             // and a signature-polymorphic instance (synthetic and not varargs).
jaroslav@1646:             // For more information see comments on {@link MethodHandleNatives#linkMethod}.
jaroslav@1646:             throw new IllegalArgumentException("cannot reflect signature polymorphic method");
jaroslav@1646:         }
jaroslav@1646:         Member mem = AccessController.doPrivileged(new PrivilegedAction<Member>() {
jaroslav@1646:                 public Member run() {
jaroslav@1646:                     try {
jaroslav@1646:                         return reflectUnchecked();
jaroslav@1646:                     } catch (ReflectiveOperationException ex) {
jaroslav@1646:                         throw new IllegalArgumentException(ex);
jaroslav@1646:                     }
jaroslav@1646:                 }
jaroslav@1646:             });
jaroslav@1646:         try {
jaroslav@1646:             Class<?> defc = getDeclaringClass();
jaroslav@1646:             byte refKind = (byte) getReferenceKind();
jaroslav@1646:             lookup.checkAccess(refKind, defc, convertToMemberName(refKind, mem));
jaroslav@1646:         } catch (IllegalAccessException ex) {
jaroslav@1646:             throw new IllegalArgumentException(ex);
jaroslav@1646:         }
jaroslav@1646:         return expected.cast(mem);
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private Member reflectUnchecked() throws ReflectiveOperationException {
jaroslav@1646:         byte refKind = (byte) getReferenceKind();
jaroslav@1646:         Class<?> defc = getDeclaringClass();
jaroslav@1646:         boolean isPublic = Modifier.isPublic(getModifiers());
jaroslav@1646:         if (MethodHandleNatives.refKindIsMethod(refKind)) {
jaroslav@1646:             if (isPublic)
jaroslav@1646:                 return defc.getMethod(getName(), getMethodType().parameterArray());
jaroslav@1646:             else
jaroslav@1646:                 return defc.getDeclaredMethod(getName(), getMethodType().parameterArray());
jaroslav@1646:         } else if (MethodHandleNatives.refKindIsConstructor(refKind)) {
jaroslav@1646:             if (isPublic)
jaroslav@1646:                 return defc.getConstructor(getMethodType().parameterArray());
jaroslav@1646:             else
jaroslav@1646:                 return defc.getDeclaredConstructor(getMethodType().parameterArray());
jaroslav@1646:         } else if (MethodHandleNatives.refKindIsField(refKind)) {
jaroslav@1646:             if (isPublic)
jaroslav@1646:                 return defc.getField(getName());
jaroslav@1646:             else
jaroslav@1646:                 return defc.getDeclaredField(getName());
jaroslav@1646:         } else {
jaroslav@1646:             throw new IllegalArgumentException("referenceKind="+refKind);
jaroslav@1646:         }
jaroslav@1646:     }
jaroslav@1646: 
jaroslav@1646:     private static MemberName convertToMemberName(byte refKind, Member mem) throws IllegalAccessException {
jaroslav@1646:         if (mem instanceof Method) {
jaroslav@1646:             boolean wantSpecial = (refKind == REF_invokeSpecial);
jaroslav@1646:             return new MemberName((Method) mem, wantSpecial);
jaroslav@1646:         } else if (mem instanceof Constructor) {
jaroslav@1646:             return new MemberName((Constructor) mem);
jaroslav@1646:         } else if (mem instanceof Field) {
jaroslav@1646:             boolean isSetter = (refKind == REF_putField || refKind == REF_putStatic);
jaroslav@1646:             return new MemberName((Field) mem, isSetter);
jaroslav@1646:         }
jaroslav@1646:         throw new InternalError(mem.getClass().getName());
jaroslav@1646:     }
jaroslav@1646: }