| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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() || member.isVarHandleMethodInvoke()); |
| 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.isVarHandleMethodInvoke()) |
| && !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<>() { |
| 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()); |
| } |
| } |