javax.management.modelmbean
Class DescriptorSupport

java.lang.Object
  |
  +--javax.management.modelmbean.DescriptorSupport

All Implemented Interfaces:

Descriptor, java.io.Serializable

public class DescriptorSupport

extends java.lang.Object

implements Descriptor

This class represents the metadata set for a ModelMBean element. A descriptor is part of the ModelMBeanInfo, ModelMBeanNotificationInfo, ModelMBeanAttributeInfo, ModelMBeanConstructorInfo, and ModelMBeanParameterInfo.

A descriptor consists of a collection of fields. Each field is in fieldname=fieldvalue format. Field names are not case sensitive, case will be preserved on field values.

All field names and values are not predefined. New fields can be defined and added by any program. Some fields have been predefined for consistency of implmentation and support by the ModelMBeanInfo ModelMBean*Info, and ModelMBean classes.

Author:

Young Yang

See Also:

Serialized Form

Constructor Summary

DescriptorSupport()

DescriptorSupport(DescriptorSupport initDescriptor)
Descriptor constructor taking a Descriptor as parameter.

DescriptorSupport(int initNumFields)
Descriptor constructor.

DescriptorSupport(java.lang.String xmlString)
Descriptor constructor taking an XML String.

DescriptorSupport(java.lang.String[] fields)
Constructor taking fields in the fieldName=fieldValue format.

DescriptorSupport(java.lang.String[] fieldNames, java.lang.Object[] fieldValues)
Constructor taking field names and field values.

Method Summary

java.lang.Object	clone() Returns a new Descriptor which is a duplicate of the Descriptor.
java.lang.String[]	getFieldNames() Returns all the fields names in the descriptor.
java.lang.String[]	getFields() Returns all the fields in the descriptor
java.lang.Object	getFieldValue(java.lang.String fieldName) returns the string value for a specific fieldname
java.lang.Object[]	getFieldValues(java.lang.String[] fieldNames) Returns all the field values in the descriptor as an array of Objects.
boolean	isValid() Returns true if fieldValues are checked to be sure they are legal for the fieldNames.
static void	main(java.lang.String[] args)
void	removeField(java.lang.String fieldName) Removes a field from the descriptor
void	setField(java.lang.String fieldName, java.lang.Object fieldValue) Sets the string value for a specific fieldname.
void	setFields(java.lang.String[] fieldNames, java.lang.Object[] fieldValues) Sets all Fields in the list to the new value in with the same index in the fieldValue array.
java.lang.String	toString()
java.lang.String	toXMLString()

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DescriptorSupport

public DescriptorSupport()

DescriptorSupport

public DescriptorSupport(int initNumFields)
                  throws MBeanException,
                         RuntimeOperationsException

Descriptor constructor. Takes as parameter the initial capacity of the Map that stores the descriptor fields. Capacity will grow as needed.

Parameters:

initNumFields - The initial capacity of the Map that stores the descriptor fields.

Throws:

RuntimeOperationsException - for illegal value for maxNumFields ( <= 0)

MBeanException

DescriptorSupport

public DescriptorSupport(DescriptorSupport initDescriptor)

Descriptor constructor taking a Descriptor as parameter. Creates a new descriptor initialized to the values of the descriptor passed in parameter.

Parameters:

initDescriptor - the descriptor to be used to initialize the constructed descriptor. If it is null or contains no descriptor fields, an empty Descriptor will be created.

Throws:

RuntimeOperationsException - for illegal value for inDescr. inDescr cannot be null. If the descriptor fails for any reason, this exception will be thrown.

DescriptorSupport

public DescriptorSupport(java.lang.String xmlString)
                  throws MBeanException,
                         RuntimeOperationsException,
                         XMLParseException

Descriptor constructor taking an XML String. This method is part of this implementation and not required by the JMX Specification

Parameters:

xmlString - An XML-formatted string used to populate this Descriptor. The format will be: ... All fields values will be created as Strings. If the field values are not Strings, the programmer will have to reset or convert these fields correctly. Fields which are not String objects will have toString() called on them to create the value. You will not be able to reconstruct these objects unless they have been specifically setup to support toString() into a meaningfull format and have a matching constructor that accepts a String in the same format.

Throws:

MBeanException

RuntimeOperationsException

XMLParseException

DescriptorSupport

public DescriptorSupport(java.lang.String[] fieldNames,
                         java.lang.Object[] fieldValues)
                  throws RuntimeOperationsException

Constructor taking field names and field values. The array and array elements cannot be null.

Parameters:

fieldNames - String array of field names. No elements of this array can be null.

fieldValues - Object array of the corresponding field values. Elements of the array can be null. The fieldValue must be valid for the fieldName. Note: array sizes of parameters should match. If both arrays are null or empty, then an empty descriptor is created. No exception is thrown.

Throws:

RuntimeOperationsException - for illegal value for field Names or field Values. The array lengths must be equal. If the descriptor construction fails for any reason, this exception will be thrown.

DescriptorSupport

public DescriptorSupport(java.lang.String[] fields)

Constructor taking fields in the fieldName=fieldValue format.

Parameters:

fields - String array of with each element containing a field name and value. If this array is null or empty, then the default constructor will be executed. Null strings or empty strings will be ignored. Note: each string should be of the form fieldName=fieldValue, with no imbedded blanks or other punctuation.

Throws:

RuntimeOperationsException - for illegal value for field Names or field Values. The field must contain an "=". "=fieldValue", "fieldName", and "fieldValue" are illegal. FieldName cannot be null. "fieldName=" will cause the value to be null. If the descriptor construction fails for any reason, this exception will be thrown.

Method Detail

getFieldValue

public java.lang.Object getFieldValue(java.lang.String fieldName)
                               throws RuntimeOperationsException

returns the string value for a specific fieldname

Specified by:

getFieldValue in interface Descriptor

Parameters:

fieldName - The field name in question; if not found, null is returned.

Returns:

String Field value

Throws:

RuntimeOperationsException - for illegal value (null or empty string) for field Names.

setField

public void setField(java.lang.String fieldName,
                     java.lang.Object fieldValue)
              throws RuntimeOperationsException

Sets the string value for a specific fieldname. The value must be valid for the field. If the field does not exist, it is added. if it does exist, the value is replaced.

Specified by:

setField in interface Descriptor

Throws:

RuntimeOperationsException - for illegal value for field Names.

getFields

public java.lang.String[] getFields()

Returns all the fields in the descriptor

Specified by:

getFields in interface Descriptor

Returns:

String array of fields in the format fieldName=fieldValue. If there are no fields in the descriptor, then String[0] is returned. If a fieldValue is an object then the toString() method is called on it and its returned value is used as the value for the field enclosed in parens.

Throws:

RuntimeOperationsException - for illegal value for field Names or Values.

getFieldNames

public java.lang.String[] getFieldNames()

Returns all the fields names in the descriptor.

Specified by:

getFieldNames in interface Descriptor

Returns:

String array of fields names. If the descriptor is empty, you will get an empty array.

getFieldValues

public java.lang.Object[] getFieldValues(java.lang.String[] fieldNames)

Returns all the field values in the descriptor as an array of Objects. The retuned values are in the same order as the fieldNames String array parameter.

Specified by:

getFieldValues in interface Descriptor

Parameters:

fieldNames - String array of the names of the fields that the values should be returned for. If the array is empty then an empty array will be returned. If the array is 'null' then all values will be returned. If a field name in the array does not exist, then null is returned for the matching array element being returned.

Returns:

Object array of field values. If the descriptor is empty, you will get an empty array.

setFields

public void setFields(java.lang.String[] fieldNames,
                      java.lang.Object[] fieldValues)
               throws RuntimeOperationsException

Sets all Fields in the list to the new value in with the same index in the fieldValue array. Array sizes must match. The field value will be validated before it is set. If it is not valid, then an exception will be thrown. If the arrays are empty, then no change will take effect.

Specified by:

setFields in interface Descriptor

Parameters:

fieldNames - String array of field names. The array and array elements cannot be null.

fieldValues - Object array of the corresponding field values. The array cannot be null. Elements of the array can be null.

Throws:

RuntimeOperationsException - for illegal value for field Names or field Values. Niether can be null. The array lengths must be equal. If the descriptor construction fails for any reason, this exception will be thrown.

clone

public java.lang.Object clone()
                       throws RuntimeOperationsException

Returns a new Descriptor which is a duplicate of the Descriptor.

Specified by:

clone in interface Descriptor

Overrides:

clone in class java.lang.Object

Throws:

RuntimeOperationsException - for illegal value for field Names or field Values. If the descriptor construction fails for any reason, this exception will be thrown.

removeField

public void removeField(java.lang.String fieldName)

Removes a field from the descriptor

Specified by:

removeField in interface Descriptor

Parameters:

fieldName - String name of the field to be removed. If the field is not found no exception is thrown.

isValid

public boolean isValid()
                throws RuntimeOperationsException

Returns true if fieldValues are checked to be sure they are legal for the fieldNames. This implementation returns false if: name or descriptorType fields are null class, role, getMethod and setMethod, if defined, must not be null persistPeriod, currencyTimeLimit, lastUpdatedTimeStamp, lastReturnedTimeStamp must numerics greater than -1. iterable, log, export must be t, f, true, or false visibility must be between 1 and 4 severity must be betwen 0 and 5 persistPolicy must be OnUpdate,OnTimer,NoMoreOftenThan,Always,or Never is must not be case sensitive.

Specified by:

isValid in interface Descriptor

Throws:

RuntimeOperationsException - If the validity checking fails for any reason, this exception will be thrown.

toXMLString

public java.lang.String toXMLString()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

java.lang.Exception