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.ServiceThe 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. | 
| Object | compute(Object key,
       BiFunction<? super Object,? super Object,? extends Object> remappingFunction)Attempts to compute a mapping for the specified key and its
 current mapped value (or  nullif there is no current
 mapping). | 
| Object | computeIfAbsent(Object key,
               Function<? super Object,? extends Object> mappingFunction)If the specified key is not already associated with a value (or
 is mapped to  null), attempts to compute its value using
 the given mapping function and enters it into this map unlessnull. | 
| Object | computeIfPresent(Object key,
                BiFunction<? super Object,? super Object,? extends Object> remappingFunction)If the value for the specified key is present and non-null, attempts to
 compute a new mapping given the key and its current mapped value. | 
| 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. | 
| void | forEach(BiConsumer<? super Object,? super Object> action)Performs the given action for each entry in this map until all entries
 have been processed or the action throws an exception. | 
| Object | get(Object key)Returns the value to which the specified key is mapped,
 or  nullif 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. | 
| Object | getOrDefault(Object key,
            Object defaultValue)Returns the value to which the specified key is mapped, or
  defaultValueif this map contains no mapping for the key. | 
| 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 | merge(Object key,
     Object value,
     BiFunction<? super Object,? super Object,? extends Object> remappingFunction)If the specified key is not already associated with a value or is
 associated with null, associates it with the given value. | 
| Object | put(Object key,
   Object value)Sets the  keyproperty to have the specifiedvalue. | 
| void | putAll(Map<?,?> t)Copies all of the mappings from the specified Map to this provider. | 
| Object | putIfAbsent(Object key,
           Object value)If the specified key is not already associated with a value (or is mapped
 to  null) associates it with the given value and returnsnull, else returns the current value. | 
| protected void | putService(Provider.Service s)Add a service. | 
| Object | remove(Object key)Removes the  keyproperty (and its correspondingvalue). | 
| boolean | remove(Object key,
      Object value)Removes the entry for the specified key only if it is currently
 mapped to the specified value. | 
| protected void | removeService(Provider.Service s)Remove a service previously added using
  putService(). | 
| Object | replace(Object key,
       Object value)Replaces the entry for the specified key only if it is
 currently mapped to some value. | 
| boolean | replace(Object key,
       Object oldValue,
       Object newValue)Replaces the entry for the specified key only if currently
 mapped to the specified value. | 
| void | replaceAll(BiFunction<? super Object,? super Object,? extends Object> function)Replaces each entry's value with the result of invoking the given
 function on that entry, in the order entries are returned by an entry
 set iterator, until all entries have been processed or the function
 throws an exception. | 
| 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, stringPropertyNamesclone, contains, containsKey, containsValue, equals, hashCode, isEmpty, rehash, sizepublic String getName()
public double getVersion()
public String getInfo()
public String toString()
public void clear()
If a security manager is enabled, 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.
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 PropertiesinStream - 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.
 If a security manager is enabled, 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.
put in interface Map<Object,Object>put in class Hashtable<Object,Object>key - the hashtable keyvalue - the valuenull if it did not have oneSecurityException - 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 putIfAbsent(Object key, Object value)
null) associates it with the given value and returns
 null, else returns the current value.
 If a security manager is enabled, 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.
putIfAbsent in interface Map<Object,Object>putIfAbsent in class Hashtable<Object,Object>key - key with which the specified value is to be associatedvalue - value to be associated with the specified keynull if there was no mapping for the key.
         (A null return can also indicate that the map
         previously associated null with the key,
         if the implementation supports null values.)SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values.public Object remove(Object key)
key property (and its corresponding
 value).
 If a security manager is enabled, 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.
remove in interface Map<Object,Object>remove in class Hashtable<Object,Object>key - the key that needs to be removednull if the key did not have a mappingSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to remove this provider's properties.public boolean remove(Object key, Object value)
If a security manager is enabled, 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.
remove in interface Map<Object,Object>remove in class Hashtable<Object,Object>key - key with which the specified value is associatedvalue - value expected to be associated with the specified keytrue if the value was removedSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to remove this provider's properties.public boolean replace(Object key, Object oldValue, Object newValue)
If a security manager is enabled, 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.
replace in interface Map<Object,Object>replace in class Hashtable<Object,Object>key - key with which the specified value is associatedoldValue - value expected to be associated with the specified keynewValue - value to be associated with the specified keytrue if the value was replacedSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values.public Object replace(Object key, Object value)
If a security manager is enabled, 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.
replace in interface Map<Object,Object>replace in class Hashtable<Object,Object>key - key with which the specified value is associatedvalue - value to be associated with the specified keynull if there was no mapping for the key.
         (A null return can also indicate that the map
         previously associated null with the key,
         if the implementation supports null values.)SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values.public void replaceAll(BiFunction<? super Object,? super Object,? extends Object> function)
If a security manager is enabled, 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.
replaceAll in interface Map<Object,Object>replaceAll in class Hashtable<Object,Object>function - the function to apply to each entrySecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values.public Object compute(Object key, BiFunction<? super Object,? super Object,? extends Object> remappingFunction)
null if there is no current
 mapping).
 If a security manager is enabled, its checkSecurityAccess
 method is called with the strings "putProviderProperty."+name
 and "removeProviderProperty."+name, where name is the
 provider name, to see if it's ok to set this provider's property values
 and remove this provider's properties.
compute in interface Map<Object,Object>compute in class Hashtable<Object,Object>key - key with which the specified value is to be associatedremappingFunction - the function to compute a valueSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values or remove properties.public Object computeIfAbsent(Object key, Function<? super Object,? extends Object> mappingFunction)
null), attempts to compute its value using
 the given mapping function and enters it into this map unless
 null.
 If a security manager is enabled, its checkSecurityAccess
 method is called with the strings "putProviderProperty."+name
 and "removeProviderProperty."+name, where name is the
 provider name, to see if it's ok to set this provider's property values
 and remove this provider's properties.
computeIfAbsent in interface Map<Object,Object>computeIfAbsent in class Hashtable<Object,Object>key - key with which the specified value is to be associatedmappingFunction - the function to compute a valueSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values and remove properties.public Object computeIfPresent(Object key, BiFunction<? super Object,? super Object,? extends Object> remappingFunction)
If a security manager is enabled, its checkSecurityAccess
 method is called with the strings "putProviderProperty."+name
 and "removeProviderProperty."+name, where name is the
 provider name, to see if it's ok to set this provider's property values
 and remove this provider's properties.
computeIfPresent in interface Map<Object,Object>computeIfPresent in class Hashtable<Object,Object>key - key with which the specified value is to be associatedremappingFunction - the function to compute a valueSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values or remove properties.public Object merge(Object key, Object value, BiFunction<? super Object,? super Object,? extends Object> remappingFunction)
If a security manager is enabled, its checkSecurityAccess
 method is called with the strings "putProviderProperty."+name
 and "removeProviderProperty."+name, where name is the
 provider name, to see if it's ok to set this provider's property values
 and remove this provider's properties.
merge in interface Map<Object,Object>merge in class Hashtable<Object,Object>key - key with which the resulting value is to be associatedvalue - the non-null value to be merged with the existing value
        associated with the key or, if no existing value or a null value
        is associated with the key, to be associated with the keyremappingFunction - the function to recompute a value if presentSecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method
          denies access to set property values or remove properties.public Object get(Object key)
Hashtablenull 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 Object getOrDefault(Object key, Object defaultValue)
MapdefaultValue if this map contains no mapping for the key.getOrDefault in interface Map<Object,Object>getOrDefault in class Hashtable<Object,Object>key - the key whose associated value is to be returneddefaultValue - the default mapping of the keydefaultValue if this map contains no mapping for the keypublic void forEach(BiConsumer<? super Object,? super Object> action)
Mappublic Enumeration<Object> keys()
Hashtablekeys in class Hashtable<Object,Object>Enumeration, 
Hashtable.elements(), 
Hashtable.keySet(), 
Mappublic Enumeration<Object> elements()
Hashtableelements in class Hashtable<Object,Object>Enumeration, 
Hashtable.keys(), 
Hashtable.values(), 
Mappublic String getProperty(String key)
Propertiesnull if the property is not found.getProperty in class Propertieskey - the property key.Properties.setProperty(java.lang.String, java.lang.String), 
Properties.defaultspublic 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 
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