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