public abstract class Provider extends Properties
Each provider has a name and a version number, and is configured in each runtime it is installed in.
See The Provider Class in the "Java Cryptography Architecture API Specification & Reference" for information about how a particular type of provider, the cryptographic service provider, works and is installed. However, please note that a provider can be used to implement any security service in Java that uses a pluggable architecture with a choice of implementations that fit underneath.
Some provider implementations may encounter unrecoverable internal
errors during their operation, for example a failure to communicate with a
security token. A ProviderException
should be used to indicate
such errors.
The service type Provider
is reserved for use by the
security framework. Services of this type cannot be added, removed,
or modified by applications.
The following attributes are automatically placed in each Provider object:
Name | Value |
---|---|
Provider.id name |
String.valueOf(provider.getName()) |
Provider.id version |
String.valueOf(provider.getVersion()) |
Provider.id info |
String.valueOf(provider.getInfo()) |
Provider.id className |
provider.getClass().getName() |
Modifier and Type | Class and Description |
---|---|
static class |
Provider.Service
The description of a security service.
|
defaults
Modifier | Constructor and Description |
---|---|
protected |
Provider(String name,
double version,
String info)
Constructs a provider with the specified name, version number,
and information.
|
Modifier and Type | Method and Description |
---|---|
void |
clear()
Clears this provider so that it no longer contains the properties
used to look up facilities implemented by the provider.
|
Enumeration<Object> |
elements()
Returns an enumeration of the values in this hashtable.
|
Set<Map.Entry<Object,Object>> |
entrySet()
Returns an unmodifiable Set view of the property entries contained
in this Provider.
|
Object |
get(Object key)
Returns the value to which the specified key is mapped,
or
null if this map contains no mapping for the key. |
String |
getInfo()
Returns a human-readable description of the provider and its
services.
|
String |
getName()
Returns the name of this provider.
|
String |
getProperty(String key)
Searches for the property with the specified key in this property list.
|
Provider.Service |
getService(String type,
String algorithm)
Get the service describing this Provider's implementation of the
specified type of this algorithm or alias.
|
Set<Provider.Service> |
getServices()
Get an unmodifiable Set of all services supported by
this Provider.
|
double |
getVersion()
Returns the version number for this provider.
|
Enumeration<Object> |
keys()
Returns an enumeration of the keys in this hashtable.
|
Set<Object> |
keySet()
Returns an unmodifiable Set view of the property keys contained in
this provider.
|
void |
load(InputStream inStream)
Reads a property list (key and element pairs) from the input stream.
|
Object |
put(Object key,
Object value)
Sets the
key property to have the specified
value . |
void |
putAll(Map<?,?> t)
Copies all of the mappings from the specified Map to this provider.
|
protected void |
putService(Provider.Service s)
Add a service.
|
Object |
remove(Object key)
Removes the
key property (and its corresponding
value ). |
protected void |
removeService(Provider.Service s)
Remove a service previously added using
putService() . |
String |
toString()
Returns a string with the name and the version number
of this provider.
|
Collection<Object> |
values()
Returns an unmodifiable Collection view of the property values
contained in this provider.
|
getProperty, list, list, load, loadFromXML, propertyNames, save, setProperty, store, store, storeToXML, storeToXML, stringPropertyNames
clone, contains, containsKey, containsValue, equals, hashCode, isEmpty, rehash, size
public String getName()
public double getVersion()
public String getInfo()
public String toString()
public void clear()
First, if there is a security manager, its
checkSecurityAccess
method is called with the string
"clearProviderProperties."+name
(where name
is the provider name) to see if it's ok to clear this provider.
If the default implementation of checkSecurityAccess
is used (that is, that method is not overriden), then this results in
a call to the security manager's checkPermission
method
with a SecurityPermission("clearProviderProperties."+name)
permission.
clear
in interface Map<Object,Object>
clear
in class Hashtable<Object,Object>
SecurityException
- if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String)
method
denies access to clear this providerpublic void load(InputStream inStream) throws IOException
load
in class Properties
inStream
- the input stream.IOException
- if an error occurred when reading from the
input stream.Properties.load(java.io.Reader)
public void putAll(Map<?,?> t)
public Set<Map.Entry<Object,Object>> entrySet()
public Set<Object> keySet()
public Collection<Object> values()
public Object put(Object key, Object value)
key
property to have the specified
value
.
First, if there is a security manager, its
checkSecurityAccess
method is called with the string
"putProviderProperty."+name
, where name
is the
provider name, to see if it's ok to set this provider's property values.
If the default implementation of checkSecurityAccess
is used (that is, that method is not overriden), then this results in
a call to the security manager's checkPermission
method
with a SecurityPermission("putProviderProperty."+name)
permission.
put
in interface Map<Object,Object>
put
in class Hashtable<Object,Object>
key
- the property key.value
- the property value.key
), or null if it did not have one.SecurityException
- if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String)
method
denies access to set property values.Object.equals(Object)
,
Hashtable.get(Object)
public Object remove(Object key)
key
property (and its corresponding
value
).
First, if there is a security manager, its
checkSecurityAccess
method is called with the string
"removeProviderProperty."+name
, where name
is
the provider name, to see if it's ok to remove this provider's
properties. If the default implementation of
checkSecurityAccess
is used (that is, that method is not
overriden), then this results in a call to the security manager's
checkPermission
method with a
SecurityPermission("removeProviderProperty."+name)
permission.
remove
in interface Map<Object,Object>
remove
in class Hashtable<Object,Object>
key
- the key for the property to be removed.SecurityException
- if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String)
method
denies access to remove this provider's properties.public Object get(Object key)
Hashtable
null
if this map contains no mapping for the key.
More formally, if this map contains a mapping from a key
k
to a value v
such that (key.equals(k))
,
then this method returns v
; otherwise it returns
null
. (There can be at most one such mapping.)
get
in interface Map<Object,Object>
get
in class Hashtable<Object,Object>
key
- the key whose associated value is to be returnednull
if this map contains no mapping for the keyHashtable.put(Object, Object)
public Enumeration<Object> keys()
Hashtable
keys
in class Hashtable<Object,Object>
Enumeration
,
Hashtable.elements()
,
Hashtable.keySet()
,
Map
public Enumeration<Object> elements()
Hashtable
elements
in class Hashtable<Object,Object>
Enumeration
,
Hashtable.keys()
,
Hashtable.values()
,
Map
public String getProperty(String key)
Properties
null
if the property is not found.getProperty
in class Properties
key
- the property key.Properties.setProperty(java.lang.String, java.lang.String)
,
Properties.defaults
public Provider.Service getService(String type, String algorithm)
putService()
and one added via put()
,
the service added via putService()
is returned.type
- the type of service
requested
(for example, MessageDigest
)algorithm
- the case insensitive algorithm name (or alternate
alias) of the service requested (for example, SHA-1
)NullPointerException
- if type or algorithm is nullpublic Set<Provider.Service> getServices()
protected void putService(Provider.Service s)
putService()
,
it is replaced by the new service.
This method also places information about this service
in the provider's Hashtable values in the format described in the
Java Cryptography Architecture API Specification & Reference .
Also, if there is a security manager, its
checkSecurityAccess
method is called with the string
"putProviderProperty."+name
, where name
is
the provider name, to see if it's ok to set this provider's property
values. If the default implementation of checkSecurityAccess
is used (that is, that method is not overriden), then this results in
a call to the security manager's checkPermission
method with
a SecurityPermission("putProviderProperty."+name)
permission.
s
- the Service to addSecurityException
- if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String)
method denies
access to set property values.NullPointerException
- if s is nullprotected void removeService(Provider.Service s)
putService()
. The specified service is removed from
this provider. It will no longer be returned by
getService()
and its information will be removed
from this provider's Hashtable.
Also, if there is a security manager, its
checkSecurityAccess
method is called with the string
"removeProviderProperty."+name
, where name
is
the provider name, to see if it's ok to remove this provider's
properties. If the default implementation of
checkSecurityAccess
is used (that is, that method is not
overriden), then this results in a call to the security manager's
checkPermission
method with a
SecurityPermission("removeProviderProperty."+name)
permission.
s
- the Service to be removedSecurityException
- if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String)
method denies
access to remove this provider's properties.NullPointerException
- if s is null 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.
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