org.spearce.jgit/src/org/spearce/jgit/util/FS_POSIX_Java6.java

   1 /*
   2  * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
   3  * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  * - Redistributions of source code must retain the above copyright
  12  *   notice, this list of conditions and the following disclaimer.
  13  *
  14  * - Redistributions in binary form must reproduce the above
  15  *   copyright notice, this list of conditions and the following
  16  *   disclaimer in the documentation and/or other materials provided
  17  *   with the distribution.
  18  *
  19  * - Neither the name of the Git Development Community nor the
  20  *   names of its contributors may be used to endorse or promote
  21  *   products derived from this software without specific prior
  22  *   written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  25  * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  26  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  29  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  34  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 package org.spearce.jgit.util;
  40
  41 import java.io.File;
  42 import java.lang.reflect.InvocationTargetException;
  43 import java.lang.reflect.Method;
  44
  45 class FS_POSIX_Java6 extends FS {
  46         private static final Method canExecute;
  47
  48         private static final Method setExecute;
  49
  50         static {
  51                 canExecute = needMethod(File.class, "canExecute");
  52                 setExecute = needMethod(File.class, "setExecutable", Boolean.TYPE);
  53         }
  54
  55         static boolean detect() {
  56                 return canExecute != null && setExecute != null;
  57         }
  58
  59         private static Method needMethod(final Class<?> on, final String name,
  60                         final Class<?>... args) {
  61                 try {
  62                         return on.getMethod(name, args);
  63                 } catch (SecurityException e) {
  64                         return null;
  65                 } catch (NoSuchMethodException e) {
  66                         return null;
  67                 }
  68         }
  69
  70         public boolean supportsExecute() {
  71                 return true;
  72         }
  73
  74         public boolean canExecute(final File f) {
  75                 try {
  76                         final Object r = canExecute.invoke(f, (Object[]) null);
  77                         return ((Boolean) r).booleanValue();
  78                 } catch (IllegalArgumentException e) {
  79                         throw new Error(e);
  80                 } catch (IllegalAccessException e) {
  81                         throw new Error(e);
  82                 } catch (InvocationTargetException e) {
  83                         throw new Error(e);
  84                 }
  85         }
  86
  87         public boolean setExecute(final File f, final boolean canExec) {
  88                 try {
  89                         final Object r;
  90                         r = setExecute.invoke(f, new Object[] { Boolean.valueOf(canExec) });
  91                         return ((Boolean) r).booleanValue();
  92                 } catch (IllegalArgumentException e) {
  93                         throw new Error(e);
  94                 } catch (IllegalAccessException e) {
  95                         throw new Error(e);
  96                 } catch (InvocationTargetException e) {
  97                         throw new Error(e);
  98                 }
  99         }
 100 }