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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.

The serialVersionUID of this class is -4679739485102359104L.

@serialinclude
Since:1.5
/** * 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;
@serialFieldval Number The numeric value

The serialVersionUID of this class is -4679739485102359104L.

/** * @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.
/** * Basic constructor. */
public NumericValueExp() { }
Creates a new NumericValue representing the numeric literal .
/** Creates a new NumericValue representing the numeric literal <val>.*/
NumericValueExp(Number val) { this.val = val; }
Returns a double numeric value
/** * 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
/** * 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.
/** * 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
/** * 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.
Params:
  • name – The name of the MBean on which the ValueExp will be applied.
Throws:
Returns: The ValueExp.
/** * 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 NumericValueExp from an ObjectInputStream.
/** * 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 NumericValueExp to an ObjectOutputStream.
/** * 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(); } } }