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## java.security
Class Provider

    java.lang.Object
      |
      +--java.util.Dictionary
            |
            +--java.util.Hashtable
                  |
                  +--java.util.Properties
                        |
                        +--java.security.Provider

All Implemented Interfaces:
  Cloneable, Map, Serializable

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.

See Also:
  Serialized Form

Nested Class Summary

Nested classes inherited from class java.util.Map
`Map.Entry`

Field Summary

Fields inherited from class java.util.Properties
`defaults`

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.
`Set` | `entrySet()` Returns an unmodifiable Set view of the property entries contained in this Provider.
`String` | `getInfo()` Returns a human-readable description of the provider and its services.
`String` | `getName()` Returns the name of this provider.
`double` | `getVersion()` Returns the version number for this provider.
`Set` | `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.
`Object` | `remove(Object key)` Removes the `key` property (and its corresponding `value`).
`String` | `toString()` Returns a string with the name and the version number of this provider.
`Collection` | `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, propertyNames, save, setProperty, store`

Methods inherited from class java.util.Hashtable
`clone, contains, containsKey, containsValue, elements, equals, get, hashCode, isEmpty, keys, rehash, size`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

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`
  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`
  Overrides:
    `clear` in class `Hashtable`
  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.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`
  Overrides:
    `putAll` in class `Hashtable`
  Parameters:
    `t` - Mappings to be stored in this map.
  Since:
    1.2

### entrySet

    public Set entrySet()

  Returns an unmodifiable Set view of the property entries contained in this Provider.

  Specified by:
    `entrySet` in interface `Map`
  Overrides:
    `entrySet` in class `Hashtable`
  Returns:
    a set view of the mappings contained in this map.
  Since:
    1.2
See Also:
  `Map.Entry`

### keySet

    public Set keySet()

  Returns an unmodifiable Set view of the property keys contained in this provider.

  Specified by:
    `keySet` in interface `Map`
  Overrides:
    `keySet` in class `Hashtable`
  Returns:
    a set view of the keys contained in this map.
  Since:
    1.2

### values

    public Collection values()

  Returns an unmodifiable Collection view of the property values contained in this provider.

  Specified by:
    `values` in interface `Map`
  Overrides:
    `values` in class `Hashtable`
  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`
  Overrides:
    `put` in class `Hashtable`
  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`
  Overrides:
    `remove` in class `Hashtable`
  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

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