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KeyStore.Builder (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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java.security
Class KeyStore.Builder

java.lang.Object
  java.security.KeyStore.Builder

Enclosing class:

KeyStore

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public abstract static class KeyStore.Builder
extends Object

A description of a to-be-instantiated KeyStore object.

An instance of this class encapsulates the information needed to instantiate and initialize a KeyStore object. That process is triggered when the getKeyStore() method is called.

This makes it possible to decouple configuration from KeyStore object creation and e.g. delay a password prompt until it is needed.

Since:

1.5

See Also:

KeyStore, KeyStoreBuilderParameters

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Constructor Summary
protected	KeyStore.Builder()           Construct a new Builder.

 

Method Summary
abstract  KeyStore	getKeyStore()           Returns the KeyStore described by this object.
abstract  KeyStore.ProtectionParameter	getProtectionParameter(String alias)           Returns the ProtectionParameters that should be used to obtain the Entry with the given alias.
static KeyStore.Builder	newInstance(KeyStore keyStore, KeyStore.ProtectionParameter protectionParameter)           Returns a new Builder that encapsulates the given KeyStore.
static KeyStore.Builder	newInstance(String type, Provider provider, File file, KeyStore.ProtectionParameter protection)           Returns a new Builder object.
static KeyStore.Builder	newInstance(String type, Provider provider, KeyStore.ProtectionParameter protection)           Returns a new Builder object.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

KeyStore.Builder

protected KeyStore.Builder()

Construct a new Builder.

Method Detail

getKeyStore

public abstract KeyStore getKeyStore()
                              throws KeyStoreException

Returns the KeyStore described by this object.

Throws:

KeyStoreException - if an error occured during the operation, for example if the KeyStore could not be instantiated or loaded

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getProtectionParameter

public abstract KeyStore.ProtectionParameter getProtectionParameter(String alias)
                                                             throws KeyStoreException

Returns the ProtectionParameters that should be used to obtain the Entry with the given alias. The getKeyStore method must be invoked before this method may be called.

Parameters:

alias - the alias of the KeyStore entry

Returns:

the ProtectionParameters that should be used to obtain the Entry with the given alias.

Throws:

NullPointerException - if alias is null

KeyStoreException - if an error occured during the operation

IllegalStateException - if the getKeyStore method has not been invoked prior to calling this method

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newInstance

public static KeyStore.Builder newInstance(KeyStore keyStore,
                                           KeyStore.ProtectionParameter protectionParameter)

Returns a new Builder that encapsulates the given KeyStore. The getKeyStore() method of the returned object will return keyStore, the getProtectionParameter() method will return protectionParameters.

This is useful if an existing KeyStore object needs to be used with Builder-based APIs.

Parameters:

keyStore - the KeyStore to be encapsulated

protectionParameter - the ProtectionParameter used to protect the KeyStore entries

Returns:

a new Builder object

Throws:

NullPointerException - if keyStore or protectionParameters is null

IllegalArgumentException - if the keyStore has not been initialized

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newInstance

public static KeyStore.Builder newInstance(String type,
                                           Provider provider,
                                           File file,
                                           KeyStore.ProtectionParameter protection)

Returns a new Builder object.

The first call to the getKeyStore() method on the returned builder will create a KeyStore of type type and call its load() method. The inputStream argument is constructed from file. If protection is a PasswordProtection, the password is obtained by calling the getPassword method. Otherwise, if protection is a CallbackHandlerProtection, the password is obtained by invoking the CallbackHandler.

Subsequent calls to getKeyStore() return the same object as the initial call. If the initial call to failed with a KeyStoreException, subsequent calls also throw a KeyStoreException.

The KeyStore is instantiated from provider if non-null. Otherwise, all installed providers are searched.

Calls to getProtectionParameter() will return a PasswordProtection object encapsulating the password that was used to invoke the load method.

Note that the getKeyStore() method is executed within the AccessControlContext of the code invoking this method.

Parameters:

type - the type of KeyStore to be constructed

provider - the provider from which the KeyStore is to be instantiated (or null)

file - the File that contains the KeyStore data

protection - the ProtectionParameter securing the KeyStore data

Returns:

a new Builder object

Throws:

NullPointerException - if type, file or protection is null

IllegalArgumentException - if protection is not an instance of either PasswordProtection or CallbackHandlerProtection; or if file does not exist or does not refer to a normal file

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newInstance

public static KeyStore.Builder newInstance(String type,
                                           Provider provider,
                                           KeyStore.ProtectionParameter protection)

Returns a new Builder object.

Each call to the getKeyStore() method on the returned builder will return a new KeyStore object of type type. Its load() method is invoked using a LoadStoreParameter that encapsulates protection.

The KeyStore is instantiated from provider if non-null. Otherwise, all installed providers are searched.

Calls to getProtectionParameter() will return protection.

Note that the getKeyStore() method is executed within the AccessControlContext of the code invoking this method.

Parameters:

type - the type of KeyStore to be constructed

provider - the provider from which the KeyStore is to be instantiated (or null)

protection - the ProtectionParameter securing the Keystore

Returns:

a new Builder object

Throws:

NullPointerException - if type or protection is null

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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