/*

 * Copyright 2004 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package sun.management;

import java.lang.management.MemoryNotificationInfo;

import java.lang.management.MemoryUsage;

import javax.management.openmbean.CompositeData;

import javax.management.openmbean.CompositeType;

import javax.management.openmbean.CompositeDataSupport;

import javax.management.openmbean.OpenDataException;

/**

 * A CompositeData for MemoryNotificationInfo for the local management support.

 * This class avoids the performance penalty paid to the

 * construction of a CompositeData use in the local case.

 */

public class MemoryNotifInfoCompositeData extends LazyCompositeData {

    private final MemoryNotificationInfo memoryNotifInfo;

    private MemoryNotifInfoCompositeData(MemoryNotificationInfo info) {

        this.memoryNotifInfo = info;

    }

    public MemoryNotificationInfo getMemoryNotifInfo() {

        return memoryNotifInfo;

    }

    public static CompositeData toCompositeData(MemoryNotificationInfo info) {

        MemoryNotifInfoCompositeData mnicd =

            new MemoryNotifInfoCompositeData(info);

        return mnicd.getCompositeData();

    }

    protected CompositeData getCompositeData() {

        // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

        // memoryNotifInfoItemNames!

        final Object[] memoryNotifInfoItemValues = {

            memoryNotifInfo.getPoolName(),

            MemoryUsageCompositeData.toCompositeData(memoryNotifInfo.getUsage()),

            new Long(memoryNotifInfo.getCount()),

        };

        try {

            return new CompositeDataSupport(memoryNotifInfoCompositeType,

                                            memoryNotifInfoItemNames,

                                            memoryNotifInfoItemValues);

        } catch (OpenDataException e) {

            // Should never reach here

            throw Util.newInternalError(e);

        }

    }

    private static final CompositeType memoryNotifInfoCompositeType;

    static {

        try {

            memoryNotifInfoCompositeType = (CompositeType)

                MappedMXBeanType.toOpenType(MemoryNotificationInfo.class);

        } catch (OpenDataException e) {

            // Should never reach here

            throw Util.newInternalError(e);

        }

    }

    private static final String POOL_NAME = "poolName";

    private static final String USAGE     = "usage";

    private static final String COUNT     = "count";

    private static final String[] memoryNotifInfoItemNames = {

        POOL_NAME,

        USAGE,

        COUNT,

    };

    public static String getPoolName(CompositeData cd) {

        String poolname = getString(cd, POOL_NAME);

        if (poolname == null) {

            throw new IllegalArgumentException("Invalid composite data: " +

                "Attribute " + POOL_NAME + " has null value");

        }

        return poolname;

    }

    public static MemoryUsage getUsage(CompositeData cd) {

        CompositeData usageData = (CompositeData) cd.get(USAGE);

        return MemoryUsage.from(usageData);

    }

    public static long getCount(CompositeData cd) {

        return getLong(cd, COUNT);

    }

    /** Validate if the input CompositeData has the expected

     * CompositeType (i.e. contain all attributes with expected

     * names and types).

     */

    public static void validateCompositeData(CompositeData cd) {

        if (cd == null) {

            throw new NullPointerException("Null CompositeData");

        }

        if (!isTypeMatched(memoryNotifInfoCompositeType, cd.getCompositeType())) {

            throw new IllegalArgumentException(

                "Unexpected composite type for MemoryNotificationInfo");

        }

    }

}