IT. Expert System.

Java Standard Edition (SE)

Provider


compact1, compact2, compact3
java.security

Class 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 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:

    Attributes Automatically Placed in a Provider Object
    NameValue
    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
    • Constructor Detail

      • 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.
    • Method Detail

      • 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.

        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.

        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
      • 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
      • 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
      • putIfAbsent

        public 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 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.

        Specified by:
        putIfAbsent in interface Map<Object,Object>
        Overrides:
        putIfAbsent in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is to be associated
        value - value to be associated with the specified key
        Returns:
        the previous value associated with the specified key, or null 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.)
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values.
        Since:
        1.8
      • remove

        public Object remove(Object key)
        Removes the 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.

        Specified by:
        remove in interface Map<Object,Object>
        Overrides:
        remove in class Hashtable<Object,Object>
        Parameters:
        key - the key that needs to be removed
        Returns:
        the value to which the key had been mapped in this hashtable, 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
      • remove

        public boolean remove(Object key,
                              Object value)
        Removes the entry for the specified key only if it is currently mapped to the specified 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.

        Specified by:
        remove in interface Map<Object,Object>
        Overrides:
        remove in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is associated
        value - value expected to be associated with the specified key
        Returns:
        true if the value was removed
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to remove this provider's properties.
        Since:
        1.8
      • replace

        public boolean replace(Object key,
                               Object oldValue,
                               Object newValue)
        Replaces the entry for the specified key only if currently mapped to 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.

        Specified by:
        replace in interface Map<Object,Object>
        Overrides:
        replace in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is associated
        oldValue - value expected to be associated with the specified key
        newValue - value to be associated with the specified key
        Returns:
        true if the value was replaced
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values.
        Since:
        1.8
      • replace

        public Object replace(Object key,
                              Object value)
        Replaces the entry for the specified key only if it is currently mapped to some 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.

        Specified by:
        replace in interface Map<Object,Object>
        Overrides:
        replace in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is associated
        value - value to be associated with the specified key
        Returns:
        the previous value associated with the specified key, or null 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.)
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values.
        Since:
        1.8
      • replaceAll

        public 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.

        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.

        Specified by:
        replaceAll in interface Map<Object,Object>
        Overrides:
        replaceAll in class Hashtable<Object,Object>
        Parameters:
        function - the function to apply to each entry
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values.
        Since:
        1.8
      • compute

        public 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 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.

        Specified by:
        compute in interface Map<Object,Object>
        Overrides:
        compute in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is to be associated
        remappingFunction - the function to compute a value
        Returns:
        the new value associated with the specified key, or null if none
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values or remove properties.
        Since:
        1.8
      • computeIfAbsent

        public 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 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.

        Specified by:
        computeIfAbsent in interface Map<Object,Object>
        Overrides:
        computeIfAbsent in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is to be associated
        mappingFunction - the function to compute a value
        Returns:
        the current (existing or computed) value associated with the specified key, or null if the computed value is null
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values and remove properties.
        Since:
        1.8
      • computeIfPresent

        public 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.

        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.

        Specified by:
        computeIfPresent in interface Map<Object,Object>
        Overrides:
        computeIfPresent in class Hashtable<Object,Object>
        Parameters:
        key - key with which the specified value is to be associated
        remappingFunction - the function to compute a value
        Returns:
        the new value associated with the specified key, or null if none
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values or remove properties.
        Since:
        1.8
      • merge

        public 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. Otherwise, replaces the value with the results of the given remapping function, or removes if the result is null. This method may be of use when combining multiple mapped values for a key.

        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.

        Specified by:
        merge in interface Map<Object,Object>
        Overrides:
        merge in class Hashtable<Object,Object>
        Parameters:
        key - key with which the resulting value is to be associated
        value - 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 key
        remappingFunction - the function to recompute a value if present
        Returns:
        the new value associated with the specified key, or null if no value is associated with the key
        Throws:
        SecurityException - if a security manager exists and its SecurityManager.checkSecurityAccess(java.lang.String) method denies access to set property values or remove properties.
        Since:
        1.8
      • 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)
      • getOrDefault

        public Object getOrDefault(Object key,
                                   Object defaultValue)
        Description copied from interface: Map
        Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
        Specified by:
        getOrDefault in interface Map<Object,Object>
        Overrides:
        getOrDefault in class Hashtable<Object,Object>
        Parameters:
        key - the key whose associated value is to be returned
        defaultValue - the default mapping of the key
        Returns:
        the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key
        Since:
        1.8
      • forEach

        public void forEach(BiConsumer<? super Object,? super Object> action)
        Description copied from interface: Map
        Performs the given action for each entry in this map until all entries have been processed or the action throws an exception. Unless otherwise specified by the implementing class, actions are performed in the order of entry set iteration (if an iteration order is specified.) Exceptions thrown by the action are relayed to the caller.
        Specified by:
        forEach in interface Map<Object,Object>
        Overrides:
        forEach in class Hashtable<Object,Object>
        Parameters:
        action - The action to be performed for each entry
        Since:
        1.8
      • 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 .

        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


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