/*

 * 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 com.sun.management.VMOption;

import com.sun.management.VMOption.Origin;

import javax.management.openmbean.CompositeType;

import javax.management.openmbean.CompositeData;

import javax.management.openmbean.CompositeDataSupport;

import javax.management.openmbean.OpenDataException;

/**

 * A CompositeData for VMOption 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 VMOptionCompositeData extends LazyCompositeData {

    private final VMOption option;

    private VMOptionCompositeData(VMOption option) {

        this.option = option;

    }

    public VMOption getVMOption() {

        return option;

    }

    public static CompositeData toCompositeData(VMOption option) {

        VMOptionCompositeData vcd = new VMOptionCompositeData(option);

        return vcd.getCompositeData();

    }

    protected CompositeData getCompositeData() {

        // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

        // vmOptionItemNames!

        final Object[] vmOptionItemValues = {

            option.getName(),

            option.getValue(),

            new Boolean(option.isWriteable()),

            option.getOrigin().toString(),

        };

        try {

            return new CompositeDataSupport(vmOptionCompositeType,

                                            vmOptionItemNames,

                                            vmOptionItemValues);

        } catch (OpenDataException e) {

            // Should never reach here

            throw new AssertionError(e);

        }

    }

    private static final CompositeType vmOptionCompositeType;

    static {

        try {

            vmOptionCompositeType = (CompositeType)

                MappedMXBeanType.toOpenType(VMOption.class);

        } catch (OpenDataException e) {

            // Should never reach here

            throw new AssertionError(e);

        }

    }

    static CompositeType getVMOptionCompositeType() {

        return vmOptionCompositeType;

    }

    private static final String NAME      = "name";

    private static final String VALUE     = "value";

    private static final String WRITEABLE = "writeable";

    private static final String ORIGIN    = "origin";

    private static final String[] vmOptionItemNames = {

        NAME,

        VALUE,

        WRITEABLE,

        ORIGIN,

    };

    public static String getName(CompositeData cd) {

        return getString(cd, NAME);

    }

    public static String getValue(CompositeData cd) {

        return getString(cd, VALUE);

    }

    public static Origin getOrigin(CompositeData cd) {

        String o = getString(cd, ORIGIN);

        return Enum.valueOf(Origin.class, o);

    }

    public static boolean isWriteable(CompositeData cd) {

        return getBoolean(cd, WRITEABLE);

    }

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

            throw new IllegalArgumentException(

                "Unexpected composite type for VMOption");

        }

    }

}