public final class FilePermission extends Permission implements Serializable
Pathname is the pathname of the file or directory granted the specified
actions. A pathname that ends in "/*" (where "/" is
the file separator character, File.separatorChar) indicates
all the files and directories contained in that directory. A pathname
that ends with "/-" indicates (recursively) all files
and subdirectories contained in that directory. A pathname consisting of
the special token "<<ALL FILES>>" matches any file.
Note: A pathname consisting of a single "*" indicates all the files in the current directory, while a pathname consisting of a single "-" indicates all the files in the current directory and (recursively) all files and subdirectories contained in the current directory.
The actions to be granted are passed to the constructor in a string containing a list of one or more comma-separated keywords. The possible keywords are "read", "write", "execute", "delete", and "readlink". Their meaning is defined as follows:
Runtime.exec to
be called. Corresponds to SecurityManager.checkExec.
File.delete to
be called. Corresponds to SecurityManager.checkDelete.
readSymbolicLink method.
The actions string is converted to lowercase before processing.
Be careful when granting FilePermissions. Think about the implications of granting read and especially write access to various files and directories. The "<<ALL FILES>>" permission with write action is especially dangerous. This grants permission to write to the entire file system. One thing this effectively allows is replacement of the system binary, including the JVM runtime environment.
Please note: Code can always read a file from the same directory it's in (or a subdirectory of that directory); it does not need explicit permission to do so.
Permission,
Permissions,
PermissionCollection| Constructor and Description |
|---|
FilePermission(String path,
String actions)
Creates a new FilePermission object with the specified actions.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
equals(Object obj)
Checks two FilePermission objects for equality.
|
String |
getActions()
Returns the "canonical string representation" of the actions.
|
int |
hashCode()
Returns the hash code value for this object.
|
boolean |
implies(Permission p)
Checks if this FilePermission object "implies" the specified permission.
|
PermissionCollection |
newPermissionCollection()
Returns a new PermissionCollection object for storing FilePermission
objects.
|
checkGuard, getName, toStringpublic FilePermission(String path, String actions)
A pathname that ends in "/*" (where "/" is
the file separator character, File.separatorChar)
indicates all the files and directories contained in that directory.
A pathname that ends with "/-" indicates (recursively) all files and
subdirectories contained in that directory. The special pathname
"<<ALL FILES>>" matches any file.
A pathname consisting of a single "*" indicates all the files in the current directory, while a pathname consisting of a single "-" indicates all the files in the current directory and (recursively) all files and subdirectories contained in the current directory.
A pathname containing an empty string represents an empty path.
path - the pathname of the file/directory.actions - the action string.IllegalArgumentException - If actions is null, empty or contains an action
other than the specified possible actions.public boolean implies(Permission p)
More specifically, this method returns true if:
implies in class Permissionp - the permission to check against.true if the specified permission is not
null and is implied by this object,
false otherwise.public boolean equals(Object obj)
equals in class Permissionobj - the object we are testing for equality with this object.true if obj is a FilePermission, and has the same
pathname and actions as this FilePermission object,
false otherwise.Object.hashCode(),
HashMappublic int hashCode()
hashCode in class PermissionObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)public String getActions()
getActions
will return the string "read,write".getActions in class Permissionpublic PermissionCollection newPermissionCollection()
FilePermission objects must be stored in a manner that allows them
to be inserted into the collection in any order, but that also enables the
PermissionCollection implies
method to be implemented in an efficient (and consistent) manner.
For example, if you have two FilePermissions:
"/tmp/-", "read"
"/tmp/scratch/foo", "write"
and you are calling the implies method with the FilePermission:
"/tmp/scratch/foo", "read,write",then the
implies function must
take into account both the "/tmp/-" and "/tmp/scratch/foo"
permissions, so the effective permission is "read,write",
and implies returns true. The "implies" semantics for
FilePermissions are handled properly by the PermissionCollection object
returned by this newPermissionCollection method.newPermissionCollection in class Permission Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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