/*

 * Copyright (c) 1999, 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 javax.management;

import com.sun.jmx.mbeanserver.GetPropertyAction;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.ObjectStreamField;

import java.security.AccessController;

/**

 * This class represents numbers that are arguments to relational constraints.

 * A NumericValueExp may be used anywhere a ValueExp is required.

 *

 * <p>The <b>serialVersionUID</b> of this class is <code>-4679739485102359104L</code>.

 *

 * @serial include

 *

 * @since 1.5

 */

@SuppressWarnings("serial")  // serialVersionUID not constant

class NumericValueExp extends QueryEval implements ValueExp {

    // Serialization compatibility stuff:

    // Two serial forms are supported in this class. The selected form depends

    // on system property "jmx.serial.form":

    //  - "1.0" for JMX 1.0

    //  - any other value for JMX 1.1 and higher

    //

    // Serial version for old serial form

    private static final long oldSerialVersionUID = -6227876276058904000L;

    //

    // Serial version for new serial form

    private static final long newSerialVersionUID = -4679739485102359104L;

    //

    // Serializable fields in old serial form

    private static final ObjectStreamField[] oldSerialPersistentFields =

    {

        new ObjectStreamField("longVal", Long.TYPE),

        new ObjectStreamField("doubleVal", Double.TYPE),

        new ObjectStreamField("valIsLong", Boolean.TYPE)

    };

    //

    // Serializable fields in new serial form

    private static final ObjectStreamField[] newSerialPersistentFields =

    {

        new ObjectStreamField("val", Number.class)

    };

    //

    // Actual serial version and serial form

    private static final long serialVersionUID;

    /**

     * @serialField val Number The numeric value

     *

     * <p>The <b>serialVersionUID</b> of this class is <code>-4679739485102359104L</code>.

     */

    private static final ObjectStreamField[] serialPersistentFields;

    private Number val = 0.0;

    private static boolean compat = false;

    static {

        try {

            GetPropertyAction act = new GetPropertyAction("jmx.serial.form");

            String form = AccessController.doPrivileged(act);

            compat = (form != null && form.equals("1.0"));

        } catch (Exception e) {

            // OK: exception means no compat with 1.0, too bad

        }

        if (compat) {

            serialPersistentFields = oldSerialPersistentFields;

            serialVersionUID = oldSerialVersionUID;

        } else {

            serialPersistentFields = newSerialPersistentFields;

            serialVersionUID = newSerialVersionUID;

        }

    }

    //

    // END Serialization compatibility stuff

    /**

     * Basic constructor.

     */

    public NumericValueExp() {

    }

    NumericValueExp(Number val)

    {

      this.val = val;

    }

    /**

     * Returns a double numeric value

     */

    public double doubleValue()  {

      if (val instanceof Long || val instanceof Integer)

      {

        return (double)(val.longValue());

      }

      return val.doubleValue();

    }

    /**

     * Returns a long numeric value

     */

    public long longValue()  {

      if (val instanceof Long || val instanceof Integer)

      {

        return val.longValue();

      }

      return (long)(val.doubleValue());

    }

    /**

     * Returns true is if the numeric value is a long, false otherwise.

     */

    public boolean isLong()  {

        return (val instanceof Long || val instanceof Integer);

    }

    /**

     * Returns the string representing the object

     */

    public String toString()  {

      if (val == null)

        return "null";

      if (val instanceof Long || val instanceof Integer)

      {

        return Long.toString(val.longValue());

      }

      double d = val.doubleValue();

      if (Double.isInfinite(d))

          return (d > 0) ? "(1.0 / 0.0)" : "(-1.0 / 0.0)";

      if (Double.isNaN(d))

          return "(0.0 / 0.0)";

      return Double.toString(d);

    }

    /**

     * Applies the ValueExp on a MBean.

     *

     * @param name The name of the MBean on which the ValueExp will be applied.

     *

     * @return  The <CODE>ValueExp</CODE>.

     *

     * @exception BadStringOperationException

     * @exception BadBinaryOpValueExpException

     * @exception BadAttributeValueExpException

     * @exception InvalidApplicationException

     */

    public ValueExp apply(ObjectName name)

            throws BadStringOperationException, BadBinaryOpValueExpException,

                   BadAttributeValueExpException, InvalidApplicationException {

        return this;

    }

    /**

     * Deserializes a {@link NumericValueExp} from an {@link ObjectInputStream}.

     */

    private void readObject(ObjectInputStream in)

            throws IOException, ClassNotFoundException {

      if (compat)

      {

        // Read an object serialized in the old serial form

        //

        double doubleVal;

        long longVal;

        boolean isLong;

        ObjectInputStream.GetField fields = in.readFields();

        doubleVal = fields.get("doubleVal", (double)0);

        if (fields.defaulted("doubleVal"))

        {

          throw new NullPointerException("doubleVal");

        }

        longVal = fields.get("longVal", (long)0);

        if (fields.defaulted("longVal"))

        {

          throw new NullPointerException("longVal");

        }

        isLong = fields.get("valIsLong", false);

        if (fields.defaulted("valIsLong"))

        {

          throw new NullPointerException("valIsLong");

        }

        if (isLong)

        {

          this.val = longVal;

        }

        else

        {

          this.val = doubleVal;

        }

      }

      else

      {

        // Read an object serialized in the new serial form

        //

        in.defaultReadObject();

      }

    }

    /**

     * Serializes a {@link NumericValueExp} to an {@link ObjectOutputStream}.

     */

    private void writeObject(ObjectOutputStream out)

            throws IOException {

      if (compat)

      {

        // Serializes this instance in the old serial form

        //

        ObjectOutputStream.PutField fields = out.putFields();

        fields.put("doubleVal", doubleValue());

        fields.put("longVal", longValue());

        fields.put("valIsLong", isLong());

        out.writeFields();

      }

      else

      {

        // Serializes this instance in the new serial form

        //

        out.defaultWriteObject();

      }

    }

    @Deprecated

    public void setMBeanServer(MBeanServer s) {

        super.setMBeanServer(s);

    }

 }