FS_POSIX_Java6.java

/*
 * Copyright (C) 2007, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Git Development Community nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.spearce.jgit.util;

import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

class FS_POSIX_Java6 extends FS {
	private static final Method canExecute;

	private static final Method setExecute;

	static {
		canExecute = needMethod(File.class, "canExecute");
		setExecute = needMethod(File.class, "setExecutable", Boolean.TYPE);
	}

	static boolean detect() {
		return canExecute != null && setExecute != null;
	}

	private static Method needMethod(final Class<?> on, final String name,
			final Class<?>... args) {
		try {
			return on.getMethod(name, args);
		} catch (SecurityException e) {
			return null;
		} catch (NoSuchMethodException e) {
			return null;
		}
	}

	public boolean supportsExecute() {
		return true;
	}

	public boolean canExecute(final File f) {
		try {
			final Object r = canExecute.invoke(f, (Object[]) null);
			return ((Boolean) r).booleanValue();
		} catch (IllegalArgumentException e) {
			throw new Error(e);
		} catch (IllegalAccessException e) {
			throw new Error(e);
		} catch (InvocationTargetException e) {
			throw new Error(e);
		}
	}

	public boolean setExecute(final File f, final boolean canExec) {
		try {
			final Object r;
			r = setExecute.invoke(f, new Object[] { Boolean.valueOf(canExec) });
			return ((Boolean) r).booleanValue();
		} catch (IllegalArgumentException e) {
			throw new Error(e);
		} catch (IllegalAccessException e) {
			throw new Error(e);
		} catch (InvocationTargetException e) {
			throw new Error(e);
		}
	}
}