/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package java.lang;

import java.util.logging.Logger;
import java.util.logging.Level;

class VMThread
{
    Thread thread;
    int vmData;

    VMThread(Thread t) {
        thread = t;
    }

    native static void create(Thread t, long stacksize);

    static native Thread currentThread();
    static native boolean interrupted();
    static native void sleep (long msec, int nsec) throws InterruptedException;
    static native void yield();

    native void interrupt();

    native boolean isInterrupted();

    /**
     *  Starts the VMThread (and thus the Java Thread) with the given
     *  stacksize.
     *
     * @param stacksize
     *                 The desired stacksize.
     */
    void start(long stacksize) {
        VMThread.create(thread, stacksize);
    }

    private static final String UNSUPPORTED_THREAD_METHOD
            = "Deprecated Thread methods are not supported.";

    /**
     * Suspends the Thread.
     */
    @SuppressWarnings("ThrowableInstanceNeverThrown")
    void suspend() {
        Logger.global.log(Level.SEVERE, UNSUPPORTED_THREAD_METHOD,
                new UnsupportedOperationException());
    }

    /**
     * Resumes the Thread, assuming it is suspended.
     */
    @SuppressWarnings("ThrowableInstanceNeverThrown")
    void resume() {
        Logger.global.log(Level.SEVERE, UNSUPPORTED_THREAD_METHOD,
                new UnsupportedOperationException());
    }

    /**
     * Queries whether this Thread holds a monitor lock on the
     * given object.
     */
    native boolean holdsLock(Object object);

    /**
     * Stops the Thread, passing it a Throwable (which might be ThreadDeath).
     */
    @SuppressWarnings("ThrowableInstanceNeverThrown")
    void stop(Throwable throwable) {
        Logger.global.log(Level.SEVERE, UNSUPPORTED_THREAD_METHOD,
                new UnsupportedOperationException());
    }

    native void setPriority(int newPriority);
    native int getStatus();

    /**
     * Holds a mapping from native Thread statii to Java one. Required for
     * translating back the result of getStatus().
     */
    static final Thread.State[] STATE_MAP = new Thread.State[] {
        Thread.State.TERMINATED,     // ZOMBIE
        Thread.State.RUNNABLE,       // RUNNING
        Thread.State.TIMED_WAITING,  // TIMED_WAIT
        Thread.State.BLOCKED,        // MONITOR
        Thread.State.WAITING,        // WAIT
        Thread.State.NEW,            // INITIALIZING
        Thread.State.NEW,            // STARTING
        Thread.State.RUNNABLE,       // NATIVE
        Thread.State.WAITING         // VMWAIT
    };

    /**
     * Tell the VM that the thread's name has changed.  This is useful for
     * DDMS, which would otherwise be oblivious to Thread.setName calls.
     */
    native void nameChanged(String newName);
}