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

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Java™ Platform
Standard Ed. 6
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java.security
Class CodeSource

java.lang.Object
  extended by java.security.CodeSource
All Implemented Interfaces:
Serializable
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 chains 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.
CodeSource(URL url, CodeSigner[] signers)
          Constructs a CodeSource and associates it with the specified location and set of code signers.
 
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.
 CodeSigner[] getCodeSigners()
          Returns the code signers 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). It may be null. The contents of the array are copied to protect against subsequent modification.

CodeSource

public CodeSource(URL url,
                  CodeSigner[] signers)
Constructs a CodeSource and associates it with the specified location and set of code signers.

Parameters:
url - the location (URL).
signers - the code signers. It may be null. The contents of the array are copied to protect against subsequent modification.
Since:
1.5
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.
See Also:
Object.equals(java.lang.Object), Hashtable

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 their signer certificate chains are of identical value. It is not required that the certificate chains 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.
See Also:
Object.hashCode(), Hashtable

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.

If this CodeSource object was created using the CodeSource(URL url, CodeSigner[] signers) constructor then its certificate chains are extracted and used to create an array of Certificate objects. Each signer certificate is followed by its supporting certificate chain (which may be empty). Each signer certificate and its supporting certificate chain is ordered bottom-to-top (i.e., with the signer certificate first and the (root) certificate authority last).

Returns:
A copy of the certificates array, or null if there is none.

getCodeSigners

public final CodeSigner[] getCodeSigners()
Returns the code signers associated with this CodeSource.

If this CodeSource object was created using the CodeSource(URL url, Certificate[] certs) constructor then its certificate chains are extracted and used to create an array of CodeSigner objects. Note that only X.509 certificates are examined - all other certificate types are ignored.

Returns:
A copy of the code signer array, or null if there is none.
Since:
1.5

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.

  1. codesource must not be null.
  2. If this object's certificates are not null, then all of this object's certificates must be present in codesource's certificates.
  3. 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
Note that if this CodeSource has a null location and a null certificate chain, then it implies every other CodeSource.

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.
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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.

Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.