/*

 * Copyright (c) 2011, 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;

/**

 * This class consists exclusively of static names internal to the

 * method handle implementation.

 * Usage:  {@code import static java.lang.invoke.MethodHandleStatics.*}

 * @author John Rose, JSR 292 EG

 */

/*non-public*/ class MethodHandleStatics {

    private MethodHandleStatics() { }  // do not instantiate

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

        if (type == null)

            type = target.type();

        MemberName name = null;

        if (target != null)

            name = MethodHandleNatives.getMethodName(target);

        if (name == null)

            return "invoke" + type;

        return name.getName() + type;

    }

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

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

    }

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

        return getNameString(target, (MethodType) null);

    }

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

        String str = String.valueOf(obj);

        if (target == null)  return str;

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

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

        return str + target.type();

    }

    static void checkSpreadArgument(Object av, int n) {

        if (av == null) {

            if (n == 0)  return;

        } else if (av instanceof Object[]) {

            int len = ((Object[])av).length;

            if (len == n)  return;

        } else {

            int len = java.lang.reflect.Array.getLength(av);

            if (len == n)  return;

        }

        // fall through to error:

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

    }

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

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

        return new IllegalStateException(message);

    }

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

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

    }

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

        return new IllegalArgumentException(message);

    }

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

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

    }

    /*non-public*/ static RuntimeException newIllegalArgumentException(String message, Object obj, Object obj2) {

        return new IllegalArgumentException(message(message, obj, obj2));

    }

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

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

        err.initCause(ex);

        return err;

    }

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

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

        return message;

    }

    private static String message(String message, Object obj, Object obj2) {

        if (obj != null || obj2 != null)  message = message + ": " + obj + ", " + obj2;

        return message;

    }

}