/*

 * Copyright (c) 2011, 2012, 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.AccessController;

import java.security.PrivilegedAction;

import sun.misc.Unsafe;

/**

 * 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

    static final Unsafe UNSAFE = Unsafe.getUnsafe();

    static final boolean DEBUG_METHOD_HANDLE_NAMES;

    static final boolean DUMP_CLASS_FILES;

    static final boolean TRACE_INTERPRETER;

    static final boolean TRACE_METHOD_LINKAGE;

    static final Integer COMPILE_THRESHOLD;

    static {

        final Object[] values = { false, false, false, false, null };

        AccessController.doPrivileged(new PrivilegedAction<Void>() {

                public Void run() {

                    values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");

                    values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");

                    values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");

                    values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");

                    values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD");

                    return null;

                }

            });

        DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];

        DUMP_CLASS_FILES          = (Boolean) values[1];

        TRACE_INTERPRETER         = (Boolean) values[2];

        TRACE_METHOD_LINKAGE      = (Boolean) values[3];

        COMPILE_THRESHOLD         = (Integer) values[4];

    }

    /** Tell if any of the debugging switches are turned on.

     *  If this is the case, it is reasonable to perform extra checks or save extra information.

     */

    /*non-public*/ static boolean debugEnabled() {

        return (DEBUG_METHOD_HANDLE_NAMES |

                DUMP_CLASS_FILES |

                TRACE_INTERPRETER |

                TRACE_METHOD_LINKAGE);

    }

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

        if (type == null)

            type = target.type();

        MemberName name = null;

        if (target != null)

            name = target.internalMemberName();

        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();

    }

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

    /*non-public*/ static InternalError newInternalError(String message) {

        return new InternalError(message);

    }

    /*non-public*/ static InternalError newInternalError(String message, Throwable cause) {

        return new InternalError(message, cause);

    }

    /*non-public*/ static InternalError newInternalError(Throwable cause) {

        return new InternalError(cause);

    }

    /*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(Throwable ex) {

        throw newInternalError("uncaught exception", ex);

    }

    static Error NYI() {

        throw new AssertionError("NYI");

    }

    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;

    }

}