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PolicySpi (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.security
Class PolicySpi

java.lang.Object
  java.security.PolicySpi

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public abstract class PolicySpi
extends Object

This class defines the Service Provider Interface (SPI) for the Policy class. All the abstract methods in this class must be implemented by each service provider who wishes to supply a Policy implementation.

Subclass implementations of this abstract class must provide a public constructor that takes a Policy.Parameters object as an input parameter. This constructor also must throw an IllegalArgumentException if it does not understand the Policy.Parameters input.

Since:

1.6

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Constructor Summary
PolicySpi()

 

Method Summary
protected  PermissionCollection	engineGetPermissions(CodeSource codesource)           Return a PermissionCollection object containing the set of permissions granted to the specified CodeSource.
protected  PermissionCollection	engineGetPermissions(ProtectionDomain domain)           Return a PermissionCollection object containing the set of permissions granted to the specified ProtectionDomain.
protected abstract  boolean	engineImplies(ProtectionDomain domain, Permission permission)           Check whether the policy has granted a Permission to a ProtectionDomain.
protected  void	engineRefresh()           Refreshes/reloads the policy configuration.

 

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

 

Constructor Detail

PolicySpi

public PolicySpi()

Method Detail

engineImplies

protected abstract boolean engineImplies(ProtectionDomain domain,
                                         Permission permission)

Check whether the policy has granted a Permission to a ProtectionDomain.

Parameters:

domain - the ProtectionDomain to check.

permission - check whether this permission is granted to the specified domain.

Returns:

boolean true if the permission is granted to the domain.

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engineRefresh

protected void engineRefresh()

Refreshes/reloads the policy configuration. The behavior of this method depends on the implementation. For example, calling refresh on a file-based policy will cause the file to be re-read.

The default implementation of this method does nothing. This method should be overridden if a refresh operation is supported by the policy implementation.

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engineGetPermissions

protected PermissionCollection engineGetPermissions(CodeSource codesource)

Return a PermissionCollection object containing the set of permissions granted to the specified CodeSource.

The default implementation of this method returns Policy.UNSUPPORTED_EMPTY_COLLECTION object. This method can be overridden if the policy implementation can return a set of permissions granted to a CodeSource.

Parameters:

codesource - the CodeSource to which the returned PermissionCollection has been granted.

Returns:

a set of permissions granted to the specified CodeSource. If this operation is supported, the returned set of permissions must be a new mutable instance and it must support heterogeneous Permission types. If this operation is not supported, Policy.UNSUPPORTED_EMPTY_COLLECTION is returned.

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engineGetPermissions

protected PermissionCollection engineGetPermissions(ProtectionDomain domain)

Return a PermissionCollection object containing the set of permissions granted to the specified ProtectionDomain.

The default implementation of this method returns Policy.UNSUPPORTED_EMPTY_COLLECTION object. This method can be overridden if the policy implementation can return a set of permissions granted to a ProtectionDomain.

Parameters:

domain - the ProtectionDomain to which the returned PermissionCollection has been granted.

Returns:

a set of permissions granted to the specified ProtectionDomain. If this operation is supported, the returned set of permissions must be a new mutable instance and it must support heterogeneous Permission types. If this operation is not supported, Policy.UNSUPPORTED_EMPTY_COLLECTION is returned.

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For further API reference and developer documentation, see Java 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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