/*

 * 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.lang.invoke.MethodHandleNatives.Constants;

/**

 * Cracking (reflecting) method handles back into their constituent symbolic parts.

 *

 */

final class MethodHandleInfo {

   public static final int

       REF_getField                = Constants.REF_getField,

       REF_getStatic               = Constants.REF_getStatic,

       REF_putField                = Constants.REF_putField,

       REF_putStatic               = Constants.REF_putStatic,

       REF_invokeVirtual           = Constants.REF_invokeVirtual,

       REF_invokeStatic            = Constants.REF_invokeStatic,

       REF_invokeSpecial           = Constants.REF_invokeSpecial,

       REF_newInvokeSpecial        = Constants.REF_newInvokeSpecial,

       REF_invokeInterface         = Constants.REF_invokeInterface;

   private final Class<?> declaringClass;

   private final String name;

   private final MethodType methodType;

   private final int referenceKind;

   public MethodHandleInfo(MethodHandle mh) {

       MemberName mn = mh.internalMemberName();

       if (mn == null)  throw new IllegalArgumentException("not a direct method handle");

       this.declaringClass = mn.getDeclaringClass();

       this.name = mn.getName();

       this.methodType = mn.getMethodOrFieldType();

       byte refKind = mn.getReferenceKind();

       if (refKind == REF_invokeSpecial && !mh.isInvokeSpecial())

           // Devirtualized method invocation is usually formally virtual.

           refKind = REF_invokeVirtual;

       this.referenceKind = refKind;

   }

   public Class<?> getDeclaringClass() {

       return declaringClass;

   }

   public String getName() {

       return name;

   }

   public MethodType getMethodType() {

       return methodType;

   }

   public int getModifiers() {

       return -1; //TODO

   }

   public int getReferenceKind() {

       return referenceKind;

   }

   static String getReferenceKindString(int referenceKind) {

        switch (referenceKind) {

            case REF_getField: return "getfield";

            case REF_getStatic: return "getstatic";

            case REF_putField: return "putfield";

            case REF_putStatic: return "putstatic";

            case REF_invokeVirtual: return "invokevirtual";

            case REF_invokeStatic: return "invokestatic";

            case REF_invokeSpecial: return "invokespecial";

            case REF_newInvokeSpecial: return "newinvokespecial";

            case REF_invokeInterface: return "invokeinterface";

            default: return "UNKNOWN_REFENCE_KIND" + "[" + referenceKind + "]";

        }

    }

    @Override

    public String toString() {

        return String.format("%s %s.%s:%s", getReferenceKindString(referenceKind),

                             declaringClass.getName(), name, methodType);

    }

}