/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

package sun.hotspot.cpuinfo;

import java.util.List;

import java.util.Arrays;

import java.util.Collections;

import java.util.regex.Pattern;

import java.util.regex.Matcher;

import sun.hotspot.WhiteBox;

/**

 * Information about CPU on test box.

 *

 * CPUInfo uses WhiteBox to gather information,

 * so WhiteBox class should be added to bootclasspath

 * and option -XX:+WhiteBoxAPI should expclicetly

 * specified on command line.

 */

public class CPUInfo {

    private static final List<String> features;

    private static final String additionalCPUInfo;

    static {

        WhiteBox wb = WhiteBox.getWhiteBox();

        Pattern additionalCPUInfoRE =

            Pattern.compile("([^(]*\\([^)]*\\)[^,]*),\\s*");

        String cpuFeaturesString = wb.getCPUFeatures();

        Matcher matcher = additionalCPUInfoRE.matcher(cpuFeaturesString);

        if (matcher.find()) {

            additionalCPUInfo = matcher.group(1);

        } else {

            additionalCPUInfo = "";

        }

        String splittedFeatures[] = matcher.replaceAll("").split("(, )| ");

        features = Collections.unmodifiableList(Arrays.

                                                asList(splittedFeatures));

    }

    /**

     * Get additional information about CPU.

     * For example, on X86 in will be family/model/stepping

     * and number of cores.

     *

     * @return additional CPU info

     */

    public static String getAdditionalCPUInfo() {

        return additionalCPUInfo;

    }

    /**

     * Get all known features supported by CPU.

     *

     * @return unmodifiable list with names of all known features

     *         supported by CPU.

     */

    public static List<String> getFeatures() {

        return features;

    }

    /**

     * Check if some feature is supported by CPU.

     *

     * @param feature Name of feature to be tested.

     * @return <b>true</b> if tested feature is supported by CPU.

     */

    public static boolean hasFeature(String feature) {

        return features.contains(feature.toLowerCase());

    }

}