ext/javax.mail.mbox/src/com/sun/mail/mbox/UNIXFolder.java

   1 /*
   2  * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v. 2.0, which is available at
   6  * http://www.eclipse.org/legal/epl-2.0.
   7  *
   8  * This Source Code may also be made available under the following Secondary
   9  * Licenses when the conditions for such availability set forth in the
  10  * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
  11  * version 2 with the GNU Classpath Exception, which is available at
  12  * https://www.gnu.org/software/classpath/license.html.
  13  *
  14  * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
  15  */
  16
  17 package com.sun.mail.mbox;
  18
  19 import java.io.*;
  20
  21 public class UNIXFolder extends UNIXFile implements MailFile {
  22     protected transient RandomAccessFile file;
  23
  24     private static final long serialVersionUID = -254578891263785591L;
  25
  26     public UNIXFolder(String name) {
  27         super(name);
  28     }
  29
  30     public boolean lock(String mode) {
  31         try {
  32             file = new RandomAccessFile(this, mode);
  33             switch (lockType) {
  34             case NONE:
  35                 return true;
  36             case NATIVE:
  37             default:
  38                 return UNIXFile.lock(file.getFD(), mode);
  39             case JAVA:
  40                 return file.getChannel().
  41                     tryLock(0L, Long.MAX_VALUE, !mode.equals("rw")) != null;
  42             }
  43         } catch (FileNotFoundException fe) {
  44             return false;
  45         } catch (IOException ie) {
  46             file = null;
  47             return false;
  48         }
  49     }
  50
  51     public void unlock() {
  52         if (file != null) {
  53             try {
  54                 file.close();
  55             } catch (IOException e) {
  56                 // ignore it
  57             }
  58             file = null;
  59         }
  60     }
  61
  62     public void touchlock() {
  63     }
  64
  65     public FileDescriptor getFD() {
  66         if (file == null)
  67             return null;
  68         try {
  69             return file.getFD();
  70         } catch (IOException e) {
  71             return null;
  72         }
  73     }
  74 }