/*

 * Copyright (c) 2004, 2008, 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.  Oracle designates this

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

 * by Oracle 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 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.management;

import java.lang.management.MemoryUsage;

import javax.management.openmbean.CompositeType;

import javax.management.openmbean.CompositeData;

import javax.management.openmbean.CompositeDataSupport;

import javax.management.openmbean.OpenDataException;

/**

 * A CompositeData for MemoryUsage 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 MemoryUsageCompositeData extends LazyCompositeData {

    private final MemoryUsage usage;

    private MemoryUsageCompositeData(MemoryUsage u) {

        this.usage = u;

    }

    public MemoryUsage getMemoryUsage() {

        return usage;

    }

    public static CompositeData toCompositeData(MemoryUsage u) {

        MemoryUsageCompositeData mucd = new MemoryUsageCompositeData(u);

        return mucd.getCompositeData();

    }

    protected CompositeData getCompositeData() {

        // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

        // memoryUsageItemNames!

        final Object[] memoryUsageItemValues = {

            usage.getInit(),

            usage.getUsed(),

            usage.getCommitted(),

            usage.getMax(),

        };

        try {

            return new CompositeDataSupport(memoryUsageCompositeType,

                                            memoryUsageItemNames,

                                            memoryUsageItemValues);

        } catch (OpenDataException e) {

            // Should never reach here

            throw new AssertionError(e);

        }

    }

    private static final CompositeType memoryUsageCompositeType;

    static {

        try {

            memoryUsageCompositeType = (CompositeType)

                MappedMXBeanType.toOpenType(MemoryUsage.class);

        } catch (OpenDataException e) {

            // Should never reach here

            throw new AssertionError(e);

        }

    }

    static CompositeType getMemoryUsageCompositeType() {

        return memoryUsageCompositeType;

    }

    private static final String INIT      = "init";

    private static final String USED      = "used";

    private static final String COMMITTED = "committed";

    private static final String MAX       = "max";

    private static final String[] memoryUsageItemNames = {

        INIT,

        USED,

        COMMITTED,

        MAX,

    };

    public static long getInit(CompositeData cd) {

        return getLong(cd, INIT);

    }

    public static long getUsed(CompositeData cd) {

        return getLong(cd, USED);

    }

    public static long getCommitted(CompositeData cd) {

        return getLong(cd, COMMITTED);

    }

    public static long getMax(CompositeData cd) {

        return getLong(cd, MAX);

    }

    /** 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(memoryUsageCompositeType, cd.getCompositeType())) {

            throw new IllegalArgumentException(

                "Unexpected composite type for MemoryUsage");

        }

    }

    private static final long serialVersionUID = -8504291541083874143L;

}