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Class semper.download.CertificateBlock 

java.lang.Object
   |
   +----semper.download.CertificateBlock
public class CertificateBlock
extends Object
implements Serializable
The CertificateBlock module defines all the data types and the associated methods in order to keep version characteristics for a package.

Version:
$Revision: 1.6 $ $Date: 1998/08/20 09:28:50 $
Author:
Petros Pantis, Kostas Tzelepis

Constructor Index

o CertificateBlock(Credentials, String, long, Vector)
Creates a new Certificate Block

Method Index

o checkCredential()
Checks if the certificate block credentials are valid
o checkFiles()
Checks if the package name is declared in the certificate block credentials
o checkSignature()
Checks the certificate block signature
o createSignature()
Creates the signature of all the files contained in the package plus the package's relative path name and the version number
o Differences(CertificateBlock, Vector[])
This method compares two certificate blocks and informs the callee about the differences
o getCredentials()
Retrieves the certificate block credentials
o getFileList()
o getIdentifier()
Retieves the certificate block identifier
o getPath()
Retrieves the relative path name of the certificate block package
o getSequence()
Method which returns the file(s) contained in a certificate block
o getVersion()
Retrieves the version number of the certificate block
o isSame(CertificateBlock)
Compares two certificate blocks for credential equality
o printSelf()
Method for debugging reasons
o updateVersion(long)
Updates the version number of the certificate block

Constructors

o CertificateBlock 
 public CertificateBlock(Credentials cred,
                         String path,
                         long version,
                         Vector fileData)
Creates a new Certificate Block

Parameters:
cred - the associated credentials object
path - the relative directory name of the package
version - the version number for the package
fileData - a collection of file(s)-characteristics contained in a package

Methods

o getSequence 
 public Vector getSequence()
Method which returns the file(s) contained in a certificate block

Returns:
value a vector object of file(s)-characteristics
o Differences 
 public boolean Differences(CertificateBlock certBlock,
                            Vector diffs[])
This method compares two certificate blocks and informs the callee about the differences

Parameters:
certBlock - the second certificate block. This certificate block will be compared with the current
diffs - all differences are added in this array
Returns:
value returns true if changes are found
o checkSignature 
 public boolean checkSignature()
Checks the certificate block signature

Returns:
value true if the signature is valid
o createSignature 
 public boolean createSignature()
Creates the signature of all the files contained in the package plus the package's relative path name and the version number

Returns:
value true on success
o checkCredential 
 public boolean checkCredential()
Checks if the certificate block credentials are valid

o isSame 
 public int isSame(CertificateBlock cbl)
Compares two certificate blocks for credential equality

Parameters:
cbl - the other certificate block object
Returns:
value returns the state of the passed credentials
o getCredentials 
 public Credentials getCredentials()
Retrieves the certificate block credentials

Returns:
value credentials contained in the certificate block
o updateVersion 
 public void updateVersion(long newVer)
Updates the version number of the certificate block

Parameters:
newVer - the new version number
o getVersion 
 public long getVersion()
Retrieves the version number of the certificate block

Returns:
value the version number
o getPath 
 public String getPath()
Retrieves the relative path name of the certificate block package

Returns:
value the path name
o getIdentifier 
 public String getIdentifier()
Retieves the certificate block identifier

Returns:
value the certificate block identifier
o checkFiles 
 public boolean checkFiles()
Checks if the package name is declared in the certificate block credentials

Returns:
value true on success
o printSelf 
 public void printSelf()
Method for debugging reasons

o getFileList 
 public Vector getFileList()

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