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ProtectionDomain (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 ProtectionDomain

java.lang.Object
  java.security.ProtectionDomain

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public class ProtectionDomain
extends Object

This ProtectionDomain class encapsulates the characteristics of a domain, which encloses a set of classes whose instances are granted a set of permissions when being executed on behalf of a given set of Principals.

A static set of permissions can be bound to a ProtectionDomain when it is constructed; such permissions are granted to the domain regardless of the Policy in force. However, to support dynamic security policies, a ProtectionDomain can also be constructed such that it is dynamically mapped to a set of permissions by the current Policy whenever a permission is checked.

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Constructor Summary
ProtectionDomain(CodeSource codesource, PermissionCollection permissions)           Creates a new ProtectionDomain with the given CodeSource and Permissions.
ProtectionDomain(CodeSource codesource, PermissionCollection permissions, ClassLoader classloader, Principal[] principals)           Creates a new ProtectionDomain qualified by the given CodeSource, Permissions, ClassLoader and array of Principals.

 

Method Summary
ClassLoader	getClassLoader()           Returns the ClassLoader of this domain.
CodeSource	getCodeSource()           Returns the CodeSource of this domain.
PermissionCollection	getPermissions()           Returns the static permissions granted to this domain.
Principal[]	getPrincipals()           Returns an array of principals for this domain.
boolean	implies(Permission permission)           Check and see if this ProtectionDomain implies the permissions expressed in the Permission object.
String	toString()           Convert a ProtectionDomain to a String.

 

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

 

Constructor Detail

ProtectionDomain

public ProtectionDomain(CodeSource codesource,
                        PermissionCollection permissions)

Creates a new ProtectionDomain with the given CodeSource and Permissions. If the permissions object is not null, then setReadOnly()) will be called on the passed in Permissions object. The only permissions granted to this domain are the ones specified; the current Policy will not be consulted.

Parameters:

codesource - the codesource associated with this domain

permissions - the permissions granted to this domain

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ProtectionDomain

public ProtectionDomain(CodeSource codesource,
                        PermissionCollection permissions,
                        ClassLoader classloader,
                        Principal[] principals)

Creates a new ProtectionDomain qualified by the given CodeSource, Permissions, ClassLoader and array of Principals. If the permissions object is not null, then setReadOnly() will be called on the passed in Permissions object. The permissions granted to this domain are dynamic; they include both the static permissions passed to this constructor, and any permissions granted to this domain by the current Policy at the time a permission is checked.

This constructor is typically used by ClassLoaders and DomainCombiners which delegate to Policy to actively associate the permissions granted to this domain. This constructor affords the Policy provider the opportunity to augment the supplied PermissionCollection to reflect policy changes.

Parameters:

codesource - the CodeSource associated with this domain

permissions - the permissions granted to this domain

classloader - the ClassLoader associated with this domain

principals - the array of Principals associated with this domain. The contents of the array are copied to protect against subsequent modification.

Since:

1.4

See Also:

Policy.refresh(), Policy.getPermissions(ProtectionDomain)

Method Detail

getCodeSource

public final CodeSource getCodeSource()

Returns the CodeSource of this domain.

Returns:

the CodeSource of this domain which may be null.

Since:

1.2

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getClassLoader

public final ClassLoader getClassLoader()

Returns the ClassLoader of this domain.

Returns:

the ClassLoader of this domain which may be null.

Since:

1.4

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getPrincipals

public final Principal[] getPrincipals()

Returns an array of principals for this domain.

Returns:

a non-null array of principals for this domain. Returns a new array each time this method is called.

Since:

1.4

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getPermissions

public final PermissionCollection getPermissions()

Returns the static permissions granted to this domain.

Returns:

the static set of permissions for this domain which may be null.

See Also:

Policy.refresh(), Policy.getPermissions(ProtectionDomain)

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implies

public boolean implies(Permission permission)

Check and see if this ProtectionDomain implies the permissions expressed in the Permission object.

The set of permissions evaluated is a function of whether the ProtectionDomain was constructed with a static set of permissions or it was bound to a dynamically mapped set of permissions.

If the ProtectionDomain was constructed to a statically bound PermissionCollection then the permission will only be checked against the PermissionCollection supplied at construction.

However, if the ProtectionDomain was constructed with the constructor variant which supports dynamically binding permissions, then the permission will be checked against the combination of the PermissionCollection supplied at construction and the current Policy binding.

Parameters:

permission - the Permission object to check.

Returns:

true if "permission" is implicit to this ProtectionDomain.

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toString

public String toString()

Convert a ProtectionDomain to a String.

Overrides:

toString in class Object

Returns:

a string representation of the object.

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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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