Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class CodeSource - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.security
Class CodeSource

java.lang.Object
  |
  +--java.security.CodeSource

public class CodeSource
extends Object
implements Serializable

This class extends the concept of a codebase to encapsulate not only the location (URL) but also the certificate(s) that were used to verify signed code originating from that location.

See Also:: Serialized Form

Constructor Summary

CodeSource(URL url, Certificate[] certs)
          Constructs a CodeSource and associates it with the specified location and set of certificates.

Method Summary

boolean equals(Object obj)
          Tests for equality between the specified object and this object.

Certificate[] getCertificates()
          Returns the certificates associated with this CodeSource.

URL getLocation()
          Returns the location associated with this CodeSource.

int hashCode()
          Returns the hash code value for this object.

boolean implies(CodeSource codesource)
          Returns true if this CodeSource object "implies" the specified CodeSource.

String toString()
          Returns a string describing this CodeSource, telling its URL and certificates.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CodeSource

public CodeSource(URL url,
                  Certificate[] certs)

Constructs a CodeSource and associates it with the specified location and set of certificates.

Parameters:: url - the location (URL).; certs - the certificate(s).

Method Detail

hashCode

public int hashCode()

Returns the hash code value for this object.

Overrides:: hashCode in class Object

Returns:: a hash code value for this object.

equals

public boolean equals(Object obj)

Tests for equality between the specified object and this object. Two CodeSource objects are considered equal if their locations are of identical value and if the two sets of certificates are of identical values. It is not required that the certificates be in the same order.

Overrides:: equals in class Object

Parameters:: obj - the object to test for equality with this object.
Returns:: true if the objects are considered equal, false otherwise.

getLocation

public final URL getLocation()

Returns the location associated with this CodeSource.

Returns:: the location (URL).

getCertificates

public final Certificate[] getCertificates()

Returns the certificates associated with this CodeSource.

Returns:: the certificates

implies

public boolean implies(CodeSource codesource)

Returns true if this CodeSource object "implies" the specified CodeSource.

More specifically, this method makes the following checks, in order. If any fail, it returns false. If they all succeed, it returns true.

codesource must not be null.
If this object's certificates are not null, then all of this object's certificates must be present in codesource's certificates.
If this object's location (getLocation()) is not null, then the following checks are made against this object's location and codesource's:
1. codesource's location must not be null.
2. If this object's location equals codesource's location, then return true.
3. This object's protocol (getLocation().getProtocol()) must be equal to codesource's protocol.
4. If this object's host (getLocation().getHost()) is not null, then the SocketPermission constructed with this object's host must imply the SocketPermission constructed with codesource's host.
5. If this object's port (getLocation().getPort()) is not equal to -1 (that is, if a port is specified), it must equal codesource's port.
6. If this object's file (getLocation().getFile()) doesn't equal codesource's file, then the following checks are made: If this object's file ends with "/-", then codesource's file must start with this object's file (exclusive the trailing "-"). If this object's file ends with a "/*", then codesource's file must start with this object's file and must not have any further "/" separators. If this object's file doesn't end with a "/", then codesource's file must match this object's file with a '/' appended.
7. If this object's reference (getLocation().getRef()) is not null, it must equal codesource's reference.

For example, the codesource objects with the following locations and null certificates all imply the codesource with the location "http://java.sun.com/classes/foo.jar" and null certificates:

     http:
     http://*.sun.com/classes/*
     http://java.sun.com/classes/-
     http://java.sun.com/classes/foo.jar

Parameters:: codesource - CodeSource to compare against.
Returns:: true if the specified codesource is implied by this codesource, false if not.

toString

public String toString()

Returns a string describing this CodeSource, telling its URL and certificates.

Overrides:: toString in class Object

Returns:: information about this CodeSource.