/*

 * Copyright (c) 2015, 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 sun.java2d.marlin;

import jdk.internal.misc.JavaLangAccess;

import jdk.internal.misc.SharedSecrets;

public final class MarlinUtils {

    // TODO: use sun.util.logging.PlatformLogger once in JDK9

    private static final java.util.logging.Logger log;

    static {

        if (MarlinConst.useLogger) {

            log = java.util.logging.Logger.getLogger("sun.java2d.marlin");

        } else {

            log = null;

        }

    }

    private MarlinUtils() {

        // no-op

    }

    public static void logInfo(final String msg) {

        if (MarlinConst.useLogger) {

            log.info(msg);

        } else if (MarlinConst.enableLogs) {

            System.out.print("INFO: ");

            System.out.println(msg);

        }

    }

    public static void logException(final String msg, final Throwable th) {

        if (MarlinConst.useLogger) {

//            log.warning(msg, th);

            log.log(java.util.logging.Level.WARNING, msg, th);

        } else if (MarlinConst.enableLogs) {

            System.out.print("WARNING: ");

            System.out.println(msg);

            th.printStackTrace(System.err);

        }

    }

    // Returns the caller's class and method's name; best effort

    // if cannot infer, return the logger's name.

    static String getCallerInfo(String className) {

        String sourceClassName = null;

        String sourceMethodName = null;

        JavaLangAccess access = SharedSecrets.getJavaLangAccess();

        Throwable throwable = new Throwable();

        int depth = access.getStackTraceDepth(throwable);

        boolean lookingForClassName = true;

        for (int ix = 0; ix < depth; ix++) {

            // Calling getStackTraceElement directly prevents the VM

            // from paying the cost of building the entire stack frame.

            StackTraceElement frame = access.getStackTraceElement(throwable, ix);

            String cname = frame.getClassName();

            if (lookingForClassName) {

                // Skip all frames until we have found the first frame having the class name.

                if (cname.equals(className)) {

                    lookingForClassName = false;

                }

            } else {

                if (!cname.equals(className)) {

                    // We've found the relevant frame.

                    sourceClassName = cname;

                    sourceMethodName = frame.getMethodName();

                    break;

                }

            }

        }

        if (sourceClassName != null) {

            return sourceClassName + " " + sourceMethodName;

        } else {

            return "unknown";

        }

    }

}