/*
* Copyright (c) 1999, 2006, 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 = new Double(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() {
}
/** Creates a new NumericValue representing the numeric literal <val>.*/
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 instanceof Long || val instanceof Integer)
{
return String.valueOf(val.longValue());
}
return String.valueOf(val.doubleValue());
}
/**
* 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 = new Long(longVal);
}
else
{
this.val = new Double(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();
}
}
}