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java.security
Class Provider
java.lang.Object
java.util.Dictionary<K,V>
java.util.Hashtable<Object,Object>
java.util.Properties
java.security.Provider
-
All Implemented Interfaces:
-
Serializable
,
Cloneable
,
Map
<
Object
,
Object
>
-
Direct Known Subclasses:
-
AuthProvider
-
public abstract class Provider
- extends Properties
This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security. Services that a provider may implement include:
-
Algorithms (such as DSA, RSA, MD5 or SHA-1).
-
Key generation, conversion, and management facilities (such as for algorithm-specific keys).
Each provider has a name and a version number, and is configured in each runtime it is installed in.
See
The Provider Class
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() |
-
See Also:
-
Serialized Form
Nested Class Summary
|
static class |
Provider.Service
The description of a security service. |
Constructor Summary
|
protected |
Provider
(
String
name, double version,
String
info)
Constructs a provider with the specified name, version number, and information. |
Method Summary
|
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
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
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. |
Methods inherited from class java.util.
Properties
|
getProperty
,
getProperty
,
list
,
list
,
load
,
loadFromXML
,
propertyNames
,
save
,
setProperty
,
store
,
store
,
storeToXML
,
storeToXML
,
stringPropertyNames
|
Methods inherited from class java.util.
Hashtable
|
clone
,
contains
,
containsKey
,
containsValue
,
elements
,
equals
,
get
,
hashCode
,
isEmpty
,
keys
,
rehash
,
size
|
Provider
protected Provider(String name,
double version,
String info)
-
Constructs a provider with the specified name, version number, and information.
-
Parameters:
-
name - the provider name.
-
version - the provider version number.
-
info - a description of the provider and its services.
getName
public String getName()
-
Returns the name of this provider.
-
-
Returns:
-
the name of this provider.
getVersion
public double getVersion()
-
Returns the version number for this provider.
-
-
Returns:
-
the version number for this provider.
getInfo
public String getInfo()
-
Returns a human-readable description of the provider and its services. This may return an HTML page, with relevant links.
-
-
Returns:
-
a description of the provider and its services.
toString
public String toString()
-
Returns a string with the name and the version number of this provider.
-
-
Overrides:
-
toString
in class
Hashtable
<
Object
,
Object
>
-
-
Returns:
-
the string with the name and the version number for this provider.
clear
public void clear()
-
Clears this provider so that it no longer contains the properties used to look up facilities implemented by the provider.
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.
-
-
Specified by:
-
clear
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
clear
in class
Hashtable
<
Object
,
Object
>
-
-
Throws:
-
SecurityException
- if a security manager exists and its
SecurityManager.checkSecurityAccess(java.lang.String)
method denies access to clear this provider
-
Since:
-
1.2
load
public void load(InputStream inStream)
throws IOException
-
Reads a property list (key and element pairs) from the input stream.
-
-
Overrides:
-
load
in class
Properties
-
-
Parameters:
-
inStream - the input stream.
-
Throws:
-
IOException
- if an error occurred when reading from the input stream.
-
See Also:
-
Properties.load(java.io.Reader)
Properties.load(java.io.InputStream)
putAll
public void putAll(Map<?,?> t)
-
Copies all of the mappings from the specified Map to this provider. These mappings will replace any properties that this provider had for any of the keys currently in the specified Map.
-
-
Specified by:
-
putAll
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
putAll
in class
Hashtable
<
Object
,
Object
>
-
-
Parameters:
-
t - mappings to be stored in this map
-
Since:
-
1.2
entrySet
public Set<Map.Entry<Object,Object>> entrySet()
-
Returns an unmodifiable Set view of the property entries contained in this Provider.
-
-
Specified by:
-
entrySet
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
entrySet
in class
Hashtable
<
Object
,
Object
>
-
-
Returns:
-
a set view of the mappings contained in this map
-
Since:
-
1.2
-
See Also:
-
Map.Entry
keySet
public Set<Object> keySet()
-
Returns an unmodifiable Set view of the property keys contained in this provider.
-
-
Specified by:
-
keySet
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
keySet
in class
Hashtable
<
Object
,
Object
>
-
-
Returns:
-
a set view of the keys contained in this map
-
Since:
-
1.2
values
public Collection<Object> values()
-
Returns an unmodifiable Collection view of the property values contained in this provider.
-
-
Specified by:
-
values
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
values
in class
Hashtable
<
Object
,
Object
>
-
-
Returns:
-
a collection view of the values contained in this map
-
Since:
-
1.2
put
public Object put(Object key,
Object value)
-
Sets the 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.
-
-
Specified by:
-
put
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
put
in class
Hashtable
<
Object
,
Object
>
-
-
Parameters:
-
key - the property key.
-
value - the property value.
-
Returns:
-
the previous value of the specified property (key), or null if it did not have one.
-
Throws:
-
SecurityException
- if a security manager exists and its
SecurityManager.checkSecurityAccess(java.lang.String)
method denies access to set property values.
-
Since:
-
1.2
-
See Also:
-
Object.equals(Object)
,
Hashtable.get(Object)
remove
public Object remove(Object key)
-
Removes the 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.
-
-
Specified by:
-
remove
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
remove
in class
Hashtable
<
Object
,
Object
>
-
-
Parameters:
-
key - the key for the property to be removed.
-
Returns:
-
the value to which the key had been mapped, or null if the key did not have a mapping.
-
Throws:
-
SecurityException
- if a security manager exists and its
SecurityManager.checkSecurityAccess(java.lang.String)
method denies access to remove this provider's properties.
-
Since:
-
1.2
get
public
Object
get
(
Object
key)
-
Description copied from class:
Hashtable
-
Returns the value to which the specified key is mapped, or 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.)
-
-
Specified by:
-
get
in interface
Map
<
Object
,
Object
>
-
Overrides:
-
get
in class
Hashtable
<
Object
,
Object
>
-
-
Parameters:
-
key - the key whose associated value is to be returned
-
Returns:
-
the value to which the specified key is mapped, or null if this map contains no mapping for the key
-
See Also:
-
Hashtable.put(Object, Object)
keys
public
Enumeration
<
Object
>
keys
()
-
Description copied from class:
Hashtable
-
Returns an enumeration of the keys in this hashtable.
-
-
Overrides:
-
keys
in class
Hashtable
<
Object
,
Object
>
-
-
Returns:
-
an enumeration of the keys in this hashtable.
-
See Also:
-
Enumeration
,
Hashtable.elements()
,
Hashtable.keySet()
,
Map
elements
public
Enumeration
<
Object
>
elements
()
-
Description copied from class:
Hashtable
-
Returns an enumeration of the values in this hashtable. Use the Enumeration methods on the returned object to fetch the elements sequentially.
-
-
Overrides:
-
elements
in class
Hashtable
<
Object
,
Object
>
-
-
Returns:
-
an enumeration of the values in this hashtable.
-
See Also:
-
Enumeration
,
Hashtable.keys()
,
Hashtable.values()
,
Map
getProperty
public
String
getProperty
(
String
key)
-
Description copied from class:
Properties
-
Searches for the property with the specified key in this property list. If the key is not found in this property list, the default property list, and its defaults, recursively, are then checked. The method returns null if the property is not found.
-
-
Overrides:
-
getProperty
in class
Properties
-
-
Parameters:
-
key - the property key.
-
Returns:
-
the value in this property list with the specified key value.
-
See Also:
-
Properties.setProperty(java.lang.String, java.lang.String)
,
Properties.defaults
getService
public Provider.Service getService(String type,
String algorithm)
-
Get the service describing this Provider's implementation of the specified type of this algorithm or alias. If no such implementation exists, this method returns null. If there are two matching services, one added to this provider using
putService()
and one added via
put()
, the service added via
putService()
is returned.
-
-
Parameters:
-
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)
-
Returns:
-
the service describing this Provider's matching service or null if no such service exists
-
Throws:
-
NullPointerException
- if type or algorithm is null
-
Since:
-
1.5
getServices
public Set<Provider.Service> getServices()
-
Get an unmodifiable Set of all services supported by this Provider.
-
-
Returns:
-
an unmodifiable Set of all services supported by this Provider
-
Since:
-
1.5
putService
protected void putService(Provider.Service s)
-
Add a service. If a service of the same type with the same algorithm name exists and it was added using
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
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.
-
-
Parameters:
-
s - the Service to add
-
Throws:
-
SecurityException
- if a security manager exists and its
SecurityManager.checkSecurityAccess(java.lang.String)
method denies access to set property values.
-
NullPointerException
- if s is null
-
Since:
-
1.5
removeService
protected void removeService(Provider.Service s)
-
Remove a service previously added using
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.
-
-
Parameters:
-
s - the Service to be removed
-
Throws:
-
SecurityException
- 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
-
Since:
-
1.5