Package Summary Overview Summary

class:PolicySpi [NONE]

```
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

constructor:PolicySpi() [NONE]

PolicySpi
```
public PolicySpi()
```

method:engineImplies(java.security.ProtectionDomain, java.security.Permission) [NONE]

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.

method:engineRefresh() [NONE]

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.

method:engineGetPermissions(java.security.CodeSource) [NONE]

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.

method:engineGetPermissions(java.security.ProtectionDomain) [NONE]

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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