1 /*

     2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

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

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

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

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

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package java.dyn;

    27 

    28 /**

    29  * This class consists exclusively of static names internal to the

    30  * method handle implementation.

    31  * Usage:  {@code import static java.dyn.MethodHandleStatics.*}

    32  * @author John Rose, JSR 292 EG

    33  */

    34 /*non-public*/ class MethodHandleStatics {

    35 

    36     private MethodHandleStatics() { }  // do not instantiate

    37 

    38     /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {

    39         if (type == null)

    40             type = target.type();

    41         MemberName name = null;

    42         if (target != null)

    43             name = MethodHandleNatives.getMethodName(target);

    44         if (name == null)

    45             return "invoke" + type;

    46         return name.getName() + type;

    47     }

    48 

    49     /*non-public*/ static String getNameString(MethodHandle target, MethodHandle typeHolder) {

    50         return getNameString(target, typeHolder == null ? (MethodType) null : typeHolder.type());

    51     }

    52 

    53     /*non-public*/ static String getNameString(MethodHandle target) {

    54         return getNameString(target, (MethodType) null);

    55     }

    56 

    57     /*non-public*/ static String addTypeString(Object obj, MethodHandle target) {

    58         String str = String.valueOf(obj);

    59         if (target == null)  return str;

    60         int paren = str.indexOf('(');

    61         if (paren >= 0) str = str.substring(0, paren);

    62         return str + target.type();

    63     }

    64 

    65     static void checkSpreadArgument(Object av, int n) {

    66         if (av == null ? n != 0 : ((Object[])av).length != n)

    67             throw newIllegalArgumentException("Array is not of length "+n);

    68     }

    69 

    70     // handy shared exception makers (they simplify the common case code)

    71     /*non-public*/ static RuntimeException newIllegalStateException(String message) {

    72         return new IllegalStateException(message);

    73     }

    74     /*non-public*/ static RuntimeException newIllegalStateException(String message, Object obj) {

    75         return new IllegalStateException(message(message, obj));

    76     }

    77     /*non-public*/ static RuntimeException newIllegalArgumentException(String message) {

    78         return new IllegalArgumentException(message);

    79     }

    80     /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj) {

    81         return new IllegalArgumentException(message(message, obj));

    82     }

    83     /*non-public*/ static Error uncaughtException(Exception ex) {

    84         Error err = new InternalError("uncaught exception");

    85         err.initCause(ex);

    86         return err;

    87     }

    88     private static String message(String message, Object obj) {

    89         if (obj != null)  message = message + ": " + obj;

    90         return message;

    91     }

    92 }