/* * Copyright (c) 2001, 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.nio.ch; import sun.misc.*;  /** * Manipulates a native array of pollfd structs. * * @author Mike McCloskey * @since 1.4 */ abstract class AbstractPollArrayWrapper {     // Event masks    static final short POLLIN       = 0x0001;    static final short POLLOUT      = 0x0004;    static final short POLLERR      = 0x0008;    static final short POLLHUP      = 0x0010;    static final short POLLNVAL     = 0x0020;    static final short POLLREMOVE   = 0x0800;     // Miscellaneous constants    static final short SIZE_POLLFD   = 8;    static final short FD_OFFSET     = 0;    static final short EVENT_OFFSET  = 4;    static final short REVENT_OFFSET = 6;     // The poll fd array    protected AllocatedNativeObject pollArray;     // Number of valid entries in the pollArray    protected int totalChannels = 0;     // Base address of the native pollArray    protected long pollArrayAddress;     // Access methods for fd structures    int getEventOps(int i) {        int offset = SIZE_POLLFD * i + EVENT_OFFSET;        return pollArray.getShort(offset);    }     int getReventOps(int i) {        int offset = SIZE_POLLFD * i + REVENT_OFFSET;        return pollArray.getShort(offset);    }     int getDescriptor(int i) {        int offset = SIZE_POLLFD * i + FD_OFFSET;        return pollArray.getInt(offset);    }     void putEventOps(int i, int event) {        int offset = SIZE_POLLFD * i + EVENT_OFFSET;        pollArray.putShort(offset, (short)event);    }     void putReventOps(int i, int revent) {        int offset = SIZE_POLLFD * i + REVENT_OFFSET;        pollArray.putShort(offset, (short)revent);    }     void putDescriptor(int i, int fd) {        int offset = SIZE_POLLFD * i + FD_OFFSET;        pollArray.putInt(offset, fd);    } }