Platform.java

/* $Id: Platform.java,v 1.6 2008/04/28 17:17:13 bhaible Exp $ */
/*******************************************************************************
 * Copyright (c) 2007-2008 SAS Institute Inc., ILOG S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     SAS Institute Inc. - initial API and implementation
 *     ILOG S.A. - initial API and implementation
 *     IBM Corporation - Java/SWT versioning code (from org.eclipse.swt.internal.Library)
 *******************************************************************************/
package org.eclipse.albireo.internal;

import org.eclipse.swt.SWT;
import org.eclipse.swt.internal.Library;

public class Platform
{
    private static String platformString = SWT.getPlatform ();

    private Platform ()
    {
        // prevent instantiation
    }

    // Window System
    public static boolean isWin32 ()
    {
        return "win32".equals ( platformString ); //$NON-NLS-1$
    }

    public static boolean isGtk ()
    {
        return "gtk".equals ( platformString ); //$NON-NLS-1$
    }

    public static boolean isMotif ()
    {
        return "motif".equals ( platformString ); //$NON-NLS-1$
    }

    public static boolean isCarbon ()
    {
        return "carbon".equals ( platformString ); //$NON-NLS-1$
    }

    //Java
    /**
     * The JAVA version
     */
    public static final int JAVA_VERSION;
    static
    {
        JAVA_VERSION = parseVersion ( System.getProperty ( "java.version" ) ); //$NON-NLS-1$
    }

    static int parseVersion ( final String version )
    {
        if ( version == null )
        {
            return 0;
        }
        int major = 0, minor = 0, micro = 0;
        final int length = version.length ();
        int index = 0, start = 0;
        while ( index < length && Character.isDigit ( version.charAt ( index ) ) )
        {
            index++;
        }
        try
        {
            if ( start < length )
            {
                major = Integer.parseInt ( version.substring ( start, index ) );
            }
        }
        catch ( final NumberFormatException e )
        {
        }
        start = ++index;
        while ( index < length && Character.isDigit ( version.charAt ( index ) ) )
        {
            index++;
        }
        try
        {
            if ( start < length )
            {
                minor = Integer.parseInt ( version.substring ( start, index ) );
            }
        }
        catch ( final NumberFormatException e )
        {
        }
        start = ++index;
        while ( index < length && Character.isDigit ( version.charAt ( index ) ) )
        {
            index++;
        }
        try
        {
            if ( start < length )
            {
                micro = Integer.parseInt ( version.substring ( start, index ) );
            }
        }
        catch ( final NumberFormatException e )
        {
        }
        return javaVersion ( major, minor, micro );
    }

    /**
     * Returns the Java version number as an integer.
     * 
     * @param major
     * @param minor
     * @param micro
     * @return the version
     */
    public static int javaVersion ( final int major, final int minor, final int micro )
    {
        return ( major << 16 ) + ( minor << 8 ) + micro;
    }

    //SWT
    // It seems necessary to use private API to get this value. Provide delegating methods here so that
    // the internal dependency is localized. 
    public static final int SWT_VERSION = Library.SWT_VERSION;

    // For the SWT version numbers, look at
    // <http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt/Eclipse SWT PI/common_j2me/org/eclipse/swt/internal/Library.java?view=log>
    public static final int SWT_33 = swtVersion ( 3, 346 );

    public static final int SWT_FIX216431 = swtVersion ( 3, 426 ); // between 3.4M4 and 3.4M5

    //public static final int SWT_34 = swtVersion(3, 4??);

    private static int swtVersion ( final int major, final int minor )
    {
        return Library.SWT_VERSION ( major, minor );
    }
}