Platform.java

/*
 * This library is free software; you can redistribute it and/or modify it under 
 * the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version. This library 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 Lesser General Public License for more details.
 */
package com.sun.jna;

/** Provide simplified platform information. */
public final class Platform
{
	public static final int		UNSPECIFIED	= -1;
	public static final int		MAC			= 0;
	public static final int		LINUX		= 1;
	public static final int		WINDOWS		= 2;
	public static final int		SOLARIS		= 3;
	public static final int		FREEBSD		= 4;
	public static final int		OPENBSD		= 5;
	public static final int		WINDOWSCE	= 6;

	/** Whether read-only (final) fields within Structures are supported. */
	public static final boolean	RO_FIELDS;
	/** Whether this platform provides NIO Buffers. */
	public static final boolean	HAS_BUFFERS;
	/** Whether this platform provides the AWT Component class. */
	public static final boolean	HAS_AWT;
	/** Canonical name of this platform's math library. */
	public static final String	MATH_LIBRARY_NAME;
	/** Canonical name of this platform's C runtime library. */
	public static final String	C_LIBRARY_NAME;

	private static final int	osType;
	private static boolean		winVista	= false;
	private static String		osName;

	static
	{
		osName = System.getProperty("os.name").toLowerCase();
		if (osName.startsWith("linux"))
		{
			osType = LINUX;
		}
		else if (osName.startsWith("mac") || osName.startsWith("darwin"))
		{
			osType = MAC;
		}
		else if (osName.startsWith("windows ce"))
		{
			osType = WINDOWSCE;
		}
		else if (osName.startsWith("windows"))
		{
			osType = WINDOWS;
			winVista = osName.contains("vista") || osName.contains(" 7") || osName.contains("2008") || osName.contains(" 8");
		}
		else if (osName.startsWith("solaris") || osName.startsWith("sunos"))
		{
			osType = SOLARIS;
		}
		else if (osName.startsWith("freebsd"))
		{
			osType = FREEBSD;
		}
		else if (osName.startsWith("openbsd"))
		{
			osType = OPENBSD;
		}
		else
		{
			osType = UNSPECIFIED;
		}
		boolean hasAWT = false;
		try
		{
			Class.forName("java.awt.Component");
			hasAWT = true;
		}
		catch (ClassNotFoundException e)
		{
		}
		HAS_AWT = hasAWT;
		boolean hasBuffers = false;
		try
		{
			Class.forName("java.nio.Buffer");
			hasBuffers = true;
		}
		catch (ClassNotFoundException e)
		{
		}
		HAS_BUFFERS = hasBuffers;
		RO_FIELDS = osType != WINDOWSCE;
		C_LIBRARY_NAME = osType == WINDOWS ? "msvcrt" : osType == WINDOWSCE ? "coredll" : "c";
		MATH_LIBRARY_NAME = osType == WINDOWS ? "msvcrt" : osType == WINDOWSCE ? "coredll" : "m";
	}

	private Platform()
	{
	}

	public static final int getOSType()
	{
		return osType;
	}

	public static final boolean isMac()
	{
		return osType == MAC;
	}

	public static final boolean isLinux()
	{
		return osType == LINUX;
	}

	public static final boolean isWindowsCE()
	{
		return osType == WINDOWSCE;
	}
	
	public static final boolean isWinVista()
	{
		return winVista;
	}

	/** Returns true for any windows variant. */
	public static final boolean isWindows()
	{
		return osType == WINDOWS || osType == WINDOWSCE;
	}

	public static final boolean isSolaris()
	{
		return osType == SOLARIS;
	}

	public static final boolean isFreeBSD()
	{
		return osType == FREEBSD;
	}

	public static final boolean isOpenBSD()
	{
		return osType == OPENBSD;
	}

	public static final boolean isX11()
	{
		// TODO: check filesystem for /usr/X11 or some other X11-specific test
		return !Platform.isWindows() && !Platform.isMac();
	}

	public static final boolean hasRuntimeExec()
	{
		if (isWindowsCE() && "J9".equals(System.getProperty("java.vm.name")))
			return false;
		return true;
	}

	public static final boolean is64Bit()
	{
		String model = System.getProperty("sun.arch.data.model", System.getProperty("com.ibm.vm.bitmode"));
		if (model != null)
		{
			return "64".equals(model);
		}
		String arch = System.getProperty("os.arch").toLowerCase();
		if ("x86_64".equals(arch) || "ia64".equals(arch) || "ppc64".equals(arch) || "sparcv9".equals(arch) || "amd64".equals(arch))
		{
			return true;
		}
		return Native.POINTER_SIZE == 8;
	}

	public static final boolean isIntel()
	{
		String arch = System.getProperty("os.arch").toLowerCase().trim();
		if (arch.equals("i386") || arch.equals("x86") || arch.equals("x86_64") || arch.equals("amd64"))
		{
			return true;
		}
		else
		{
			return false;
		}
	}

	public static final boolean isPPC()
	{
		String arch = System.getProperty("os.arch").toLowerCase().trim();
		if (arch.equals("ppc") || arch.equals("ppc64") || arch.equals("powerpc") || arch.equals("powerpc64"))
		{
			return true;
		}
		else
		{
			return false;
		}
	}

	public static final boolean isARM()
	{
		String arch = System.getProperty("os.arch").toLowerCase().trim();
		if (arch.equals("arm"))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
}