/*******************************************************************************

 * Copyright (c) 2000, 2007 IBM Corporation and others.

 * 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:

 *     IBM Corporation - initial API and implementation

 *******************************************************************************/

package org.eclipse.swt.internal;

public class Library {

	/* SWT Version - Mmmm (M=major, mmm=minor) */

	/**

	 * SWT Major version number (must be >= 0)

	 */

    static int MAJOR_VERSION = 3;

	/**

	 * SWT Minor version number (must be in the range 0..999)

	 */

    static int MINOR_VERSION = 426;

	/**

	 * SWT revision number (must be >= 0)

	 */

	static int REVISION = 0;

	/**

	 * The JAVA and SWT versions

	 */

	public static final int JAVA_VERSION, SWT_VERSION;

static {

	JAVA_VERSION = parseVersion(System.getProperty("java.version"));

	SWT_VERSION = SWT_VERSION(MAJOR_VERSION, MINOR_VERSION);

}

static int parseVersion(String version) {

	if (version == null) return 0;

	int major = 0, minor = 0, micro = 0;

	int length = version.length(), 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 (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 (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 (NumberFormatException e) {}

	return JAVA_VERSION(major, minor, micro);

}

/**

 * Returns the Java version number as an integer.

 * 

 * @param major

 * @param minor

 * @param micro

 * @return the version

 */

public static int JAVA_VERSION (int major, int minor, int micro) {

	return (major << 16) + (minor << 8) + micro;

}

/**

 * Returns the SWT version number as an integer.

 * 

 * @param major

 * @param minor

 * @return the version

 */

public static int SWT_VERSION (int major, int minor) {

	return major * 1000 + minor;

}

/**

 * Loads the shared library that matches the version of the

 * Java code which is currently running.  SWT shared libraries

 * follow an encoding scheme where the major, minor and revision

 * numbers are embedded in the library name and this along with

 * <code>name</code> is used to load the library.  If this fails,

 * <code>name</code> is used in another attempt to load the library,

 * this time ignoring the SWT version encoding scheme.

 *

 * @param name the name of the library to load

 */

public static void loadLibrary (String name) {

	loadLibrary (name, true);

}

/**

 * Loads the shared library that matches the version of the

 * Java code which is currently running.  SWT shared libraries

 * follow an encoding scheme where the major, minor and revision

 * numbers are embedded in the library name and this along with

 * <code>name</code> is used to load the library.  If this fails,

 * <code>name</code> is used in another attempt to load the library,

 * this time ignoring the SWT version encoding scheme.

 *

 * @param name the name of the library to load

 * @param mapName true if the name should be mapped, false otherwise

 */

public static void loadLibrary (String name, boolean mapName) {

	com.nokia.mj.impl.rt.support.Jvm.loadSystemLibrary(name);

}

}