public class ObjectName extends Object implements Comparable<ObjectName>, QueryExp
Represents the object name of an MBean, or a pattern that can match the names of several MBeans. Instances of this class are immutable.
An instance of this class can be used to represent:
An object name consists of two parts, the domain and the key properties.
The domain is a string of characters not including
the character colon (:). It is recommended that the domain
should not contain the string "//", which is reserved for future use.
If the domain includes at least one occurrence of the wildcard
characters asterisk (*) or question mark
(?), then the object name is a pattern. The asterisk
matches any sequence of zero or more characters, while the question
mark matches any single character.
If the domain is empty, it will be replaced in certain contexts by the default domain of the MBean server in which the ObjectName is used.
The key properties are an unordered set of keys and associated values.
Each key is a nonempty string of characters which may
not contain any of the characters comma (,), equals
(=), colon, asterisk, or question mark. The same key
may not occur twice in a given ObjectName.
Each value associated with a key is a string of characters that is either unquoted or quoted.
An unquoted value is a possibly empty string of characters which may not contain any of the characters comma, equals, colon, or quote.
If the unquoted value contains at least one occurrence of the wildcard characters asterisk or question mark, then the object name is a property value pattern. The asterisk matches any sequence of zero or more characters, while the question mark matches any single character.
A quoted value consists of a quote ("),
followed by a possibly empty string of characters, followed by
another quote. Within the string of characters, the backslash
(\) has a special meaning. It must be followed by
one of the following characters:
A quote may not appear inside a quoted value except immediately after an odd number of consecutive backslashes.
The quotes surrounding a quoted value, and any backslashes within that value, are considered to be part of the value.
If the quoted value contains at least one occurrence of the characters asterisk or question mark and they are not preceded by a backslash, then they are considered as wildcard characters and the object name is a property value pattern. The asterisk matches any sequence of zero or more characters, while the question mark matches any single character.
An ObjectName may be a property list pattern. In this case it may have zero or more keys and associated values. It matches a nonpattern ObjectName whose domain matches and that contains the same keys and associated values, as well as possibly other keys and values.
An ObjectName is a property value pattern when at least one of its quoted or unquoted key property values contains the wildcard characters asterisk or question mark as described above. In this case it has one or more keys and associated values, with at least one of the values containing wildcard characters. It matches a nonpattern ObjectName whose domain matches and that contains the same keys whose values match; if the property value pattern is also a property list pattern then the nonpattern ObjectName can contain other keys and values.
An ObjectName is a property pattern if it is either a property list pattern or a property value pattern or both.
An ObjectName is a pattern if its domain contains a wildcard or if the ObjectName is a property pattern.
If an ObjectName is not a pattern, it must contain at least one key with its associated value.
Examples of ObjectName patterns are:
*:type=Foo,name=Bar to match names in any domain whose
exact set of keys is type=Foo,name=Bar.d:type=Foo,name=Bar,* to match names in the domain
d that have the keys type=Foo,name=Bar plus
zero or more other keys.*:type=Foo,name=Bar,* to match names in any domain
that has the keys type=Foo,name=Bar plus zero or
more other keys.d:type=F?o,name=Bar will match e.g.
d:type=Foo,name=Bar and d:type=Fro,name=Bar.d:type=F*o,name=Bar will match e.g.
d:type=Fo,name=Bar and d:type=Frodo,name=Bar.d:type=Foo,name="B*" will match e.g.
d:type=Foo,name="Bling". Wildcards are recognized even
inside quotes, and like other special characters can be escaped
with \.An ObjectName can be written as a String with the following elements in order:
:).
A key property list written as a String is a comma-separated
list of elements. Each element is either an asterisk or a key
property. A key property consists of a key, an equals
(=), and the associated value.
At most one element of a key property list may be an asterisk. If the key property list contains an asterisk element, the ObjectName is a property list pattern.
Spaces have no special significance in a String representing an ObjectName. For example, the String:
domain: key1 = value1 , key2 = value2represents an ObjectName with two keys. The name of each key contains six characters, of which the first and last are spaces. The value associated with the key
" key1 "
also begins and ends with a space.
In addition to the restrictions on characters spelt out above,
no part of an ObjectName may contain a newline character
('\n'), whether the domain, a key, or a value, whether
quoted or unquoted. The newline character can be represented in a
quoted value with the sequence \n.
The rules on special characters and quoting apply regardless of which constructor is used to make an ObjectName.
To avoid collisions between MBeans supplied by different
vendors, a useful convention is to begin the domain name with the
reverse DNS name of the organization that specifies the MBeans,
followed by a period and a string whose interpretation is
determined by that organization. For example, MBeans specified by
example.com would have
domains such as com.example.MyDomain. This is essentially
the same convention as for Java-language package names.
The serialVersionUID of this class is 1081892073854801359L.
| Modifier and Type | Field and Description |
|---|---|
static ObjectName |
WILDCARD
Defines the wildcard "*:*" ObjectName.
|
| Constructor and Description |
|---|
ObjectName(String name)
Construct an object name from the given string.
|
ObjectName(String domain,
Hashtable<String,String> table)
Construct an object name with several key properties from a Hashtable.
|
ObjectName(String domain,
String key,
String value)
Construct an object name with exactly one key property.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
apply(ObjectName name)
Test whether this ObjectName, which may be a pattern,
matches another ObjectName.
|
int |
compareTo(ObjectName name)
Compares two ObjectName instances.
|
boolean |
equals(Object object)
Compares the current object name with another object name.
|
String |
getCanonicalKeyPropertyListString()
Returns a string representation of the list of key properties,
in which the key properties are sorted in lexical order.
|
String |
getCanonicalName()
Returns the canonical form of the name; that is, a string
representation where the properties are sorted in lexical
order.
|
String |
getDomain()
Returns the domain part.
|
static ObjectName |
getInstance(ObjectName name)
Return an instance of ObjectName that can be used anywhere
the given object can be used.
|
static ObjectName |
getInstance(String name)
Return an instance of ObjectName that can be used anywhere
an object obtained with
new
ObjectName(name) can be used. |
static ObjectName |
getInstance(String domain,
Hashtable<String,String> table)
Return an instance of ObjectName that can be used anywhere
an object obtained with
new ObjectName(domain, table) can be used. |
static ObjectName |
getInstance(String domain,
String key,
String value)
Return an instance of ObjectName that can be used anywhere
an object obtained with
new ObjectName(domain, key, value) can be used. |
String |
getKeyProperty(String property)
Obtains the value associated with a key in a key property.
|
Hashtable<String,String> |
getKeyPropertyList()
Returns the key properties as a Hashtable.
|
String |
getKeyPropertyListString()
Returns a string representation of the list of key
properties specified at creation time.
|
int |
hashCode()
Returns a hash code for this object name.
|
boolean |
isDomainPattern()
Checks whether the object name is a pattern on the domain part.
|
boolean |
isPattern()
Checks whether the object name is a pattern.
|
boolean |
isPropertyListPattern()
Checks whether the object name is a pattern on the key property list.
|
boolean |
isPropertyPattern()
Checks whether the object name is a pattern on the key properties.
|
boolean |
isPropertyValuePattern()
Checks whether the object name is a pattern on the value part
of at least one of the key properties.
|
boolean |
isPropertyValuePattern(String property)
Checks whether the value associated with a key in a key
property is a pattern.
|
static String |
quote(String s)
Returns a quoted form of the given String, suitable for
inclusion in an ObjectName.
|
void |
setMBeanServer(MBeanServer mbs)
Sets the MBean server on which the query is to be performed.
|
String |
toString()
Returns a string representation of the object name.
|
static String |
unquote(String q)
Returns an unquoted form of the given String.
|
public static final ObjectName WILDCARD
public ObjectName(String name) throws MalformedObjectNameException
name - A string representation of the object name.MalformedObjectNameException - The string passed as a
parameter does not have the right format.NullPointerException - The name parameter
is null.public ObjectName(String domain, String key, String value) throws MalformedObjectNameException
domain - The domain part of the object name.key - The attribute in the key property of the object name.value - The value in the key property of the object name.MalformedObjectNameException - The
domain, key, or value
contains an illegal character, or value does not
follow the rules for quoting.NullPointerException - One of the parameters is null.public ObjectName(String domain, Hashtable<String,String> table) throws MalformedObjectNameException
domain - The domain part of the object name.table - A hash table containing one or more key
properties. The key of each entry in the table is the key of a
key property in the object name. The associated value in the
table is the associated value in the object name.MalformedObjectNameException - The domain
contains an illegal character, or one of the keys or values in
table contains an illegal character, or one of the
values in table does not follow the rules for
quoting.NullPointerException - One of the parameters is null.public static ObjectName getInstance(String name) throws MalformedObjectNameException, NullPointerException
Return an instance of ObjectName that can be used anywhere
an object obtained with new
ObjectName(name) can be used. The returned object may be of
a subclass of ObjectName. Calling this method twice with the
same parameters may return the same object or two equal but
not identical objects.
name - A string representation of the object name.MalformedObjectNameException - The string passed as a
parameter does not have the right format.NullPointerException - The name parameter
is null.public static ObjectName getInstance(String domain, String key, String value) throws MalformedObjectNameException
Return an instance of ObjectName that can be used anywhere
an object obtained with new ObjectName(domain, key, value) can be used. The
returned object may be of a subclass of ObjectName. Calling
this method twice with the same parameters may return the same
object or two equal but not identical objects.
domain - The domain part of the object name.key - The attribute in the key property of the object name.value - The value in the key property of the object name.MalformedObjectNameException - The
domain, key, or value
contains an illegal character, or value does not
follow the rules for quoting.NullPointerException - One of the parameters is null.public static ObjectName getInstance(String domain, Hashtable<String,String> table) throws MalformedObjectNameException
Return an instance of ObjectName that can be used anywhere
an object obtained with new ObjectName(domain, table) can be used. The returned
object may be of a subclass of ObjectName. Calling this method
twice with the same parameters may return the same object or
two equal but not identical objects.
domain - The domain part of the object name.table - A hash table containing one or more key
properties. The key of each entry in the table is the key of a
key property in the object name. The associated value in the
table is the associated value in the object name.MalformedObjectNameException - The domain
contains an illegal character, or one of the keys or values in
table contains an illegal character, or one of the
values in table does not follow the rules for
quoting.NullPointerException - One of the parameters is null.public static ObjectName getInstance(ObjectName name)
Return an instance of ObjectName that can be used anywhere
the given object can be used. The returned object may be of a
subclass of ObjectName. If name is of a subclass
of ObjectName, it is not guaranteed that the returned object
will be of the same class.
The returned value may or may not be identical to
name. Calling this method twice with the same
parameters may return the same object or two equal but not
identical objects.
Since ObjectName is immutable, it is not usually useful to make a copy of an ObjectName. The principal use of this method is to guard against a malicious caller who might pass an instance of a subclass with surprising behavior to sensitive code. Such code can call this method to obtain an ObjectName that is known not to have surprising behavior.
name - an instance of the ObjectName class or of a subclassname respects the
semantics of ObjectName, then the returned object is equal
(though not necessarily identical) to name.NullPointerException - The name is null.public boolean isPattern()
An object name is a pattern if its domain contains a wildcard or if the object name is a property pattern.
public boolean isDomainPattern()
public boolean isPropertyPattern()
An object name is a pattern on the key properties if it is a pattern on the key property list (e.g. "d:k=v,*") or on the property values (e.g. "d:k=*") or on both (e.g. "d:k=*,*").
public boolean isPropertyListPattern()
For example, "d:k=v,*" and "d:k=*,*" are key property list patterns whereas "d:k=*" is not.
public boolean isPropertyValuePattern()
For example, "d:k=*" and "d:k=*,*" are property value patterns whereas "d:k=v,*" is not.
public boolean isPropertyValuePattern(String property)
property - The property whose value is to be checked.NullPointerException - If property is null.IllegalArgumentException - If property is not
a valid key property for this ObjectName.public String getCanonicalName()
Returns the canonical form of the name; that is, a string representation where the properties are sorted in lexical order.
More precisely, the canonical form of the name is a String
consisting of the domain part, a colon
(:), the canonical key property list, and
a pattern indication.
The canonical key property list is the same string
as described for getCanonicalKeyPropertyListString().
The pattern indication is:
,*) for an ObjectName that is a property
list pattern with at least one key.
public String getDomain()
public String getKeyProperty(String property)
property - The property whose value is to be obtained.NullPointerException - If property is null.public Hashtable<String,String> getKeyPropertyList()
Returns the key properties as a Hashtable. The returned value is a Hashtable in which each key is a key in the ObjectName's key property list and each value is the associated value.
The returned value may be unmodifiable. If it is modifiable, changing it has no effect on this ObjectName.
public String getKeyPropertyListString()
Returns a string representation of the list of key
properties specified at creation time. If this ObjectName was
constructed with the constructor ObjectName(String),
the key properties in the returned String will be in the same
order as in the argument to the constructor.
public String getCanonicalKeyPropertyListString()
String.compareTo(String).public String toString()
Returns a string representation of the object name. The format of this string is not specified, but users can expect that two ObjectNames return the same string if and only if they are equal.
public boolean equals(Object object)
getCanonicalName().equals in class Objectobject - The object name that the current object name is to be
compared with.object is an ObjectName whose
canonical form is equal to that of this ObjectName.Object.hashCode(),
HashMappublic int hashCode()
hashCode in class ObjectObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)public static String quote(String s)
Returns a quoted form of the given String, suitable for
inclusion in an ObjectName. The returned value can be used as
the value associated with a key in an ObjectName. The String
s may contain any character. Appropriate quoting
ensures that the returned value is legal in an ObjectName.
The returned value consists of a quote ('"'), a sequence of
characters corresponding to the characters of s,
and another quote. Characters in s appear
unchanged within the returned value except:
s - the String to be quoted.NullPointerException - if s is null.public static String unquote(String q)
Returns an unquoted form of the given String. If
q is a String returned by quote(s),
then unquote(q).equals(s). If there is no String
s for which quote(s).equals(q), then
unquote(q) throws an IllegalArgumentException.
These rules imply that there is a one-to-one mapping between quoted and unquoted forms.
q - the String to be unquoted.IllegalArgumentException - if q could not
have been returned by the quote(java.lang.String) method, for instance
if it does not begin and end with a quote (").NullPointerException - if q is null.public boolean apply(ObjectName name)
Test whether this ObjectName, which may be a pattern,
matches another ObjectName. If name is a pattern,
the result is false. If this ObjectName is a pattern, the
result is true if and only if name matches the
pattern. If neither this ObjectName nor name is
a pattern, the result is true if and only if the two
ObjectNames are equal as described for the equals(Object) method.
apply in interface QueryExpname - The name of the MBean to compare to.name matches this ObjectName.NullPointerException - if name is null.public void setMBeanServer(MBeanServer mbs)
QueryExpsetMBeanServer in interface QueryExpmbs - The MBean server on which the query is to be performed.public int compareTo(ObjectName name)
Compares two ObjectName instances. The ordering relation between ObjectNames is not completely specified but is intended to be such that a sorted list of ObjectNames will appear in an order that is convenient for a person to read.
In particular, if the two ObjectName instances have different domains then their order is the lexicographical order of the domains. The ordering of the key property list remains unspecified.
For example, the ObjectName instances below:
could be ordered as follows:
compareTo in interface Comparable<ObjectName>name - the ObjectName to be compared. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2020, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.