java.net
Class JarURLConnection

java.lang.Object
  |
  +--java.net.URLConnection
        |
        +--java.net.JarURLConnection

public abstract class JarURLConnection
extends URLConnection

Untamed: A URL Connection to a Java ARchive (JAR) file or an entry in a JAR file.

The syntax of a JAR URL is:

 jar:<url>!/{entry}
 

for example:

jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class

Jar URLs should be used to refer to a JAR file or entries in a JAR file. The example above is a JAR URL which refers to a JAR entry. If the entry name is omitted, the URL refers to the whole JAR file: jar:http://www.foo.com/bar/baz.jar!/

Users should cast the generic URLConnection to a JarURLConnection when they know that the URL they created is a JAR URL, and they need JAR-specific functionality. For example:

 URL url = new URL("jar:file:/home/duke/duke.jar!/");
 JarURLConnection jarConnection = (JarURLConnection)url.openConnection();
 Manifest manifest = jarConnection.getManifest();
 

Examples:

A Jar entry
jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class
A Jar file
jar:http://www.foo.com/bar/baz.jar!/
A Jar directory
jar:http://www.foo.com/bar/baz.jar!/COM/foo/

!/ is refered to as the separator.

When constructing a JAR url via new URL(context, spec), the following rules apply:

Since:
1.2
Author:
Benjamin Renaud
See Also:
java.net.URL, java.net.URLConnection, java.util.jar.JarFile, java.util.jar.JarInputStream, java.util.jar.Manifest, java.util.zip.ZipEntry

Field Summary
private  String entryName
           
private  URL jarFileURL
           
protected  URLConnection jarFileURLConnection
          The connection to the JAR file URL, if the connection has been initiated.
 
Fields inherited from class java.net.URLConnection
allowUserInteraction, connected, doInput, doOutput, factory, ifModifiedSince, url, useCaches
 
Constructor Summary
protected JarURLConnection(URL url)
          Creates the new JarURLConnection to the specified URL.
 
Method Summary
 java.util.jar.Attributes getAttributes()
          Enabled: Return the Attributes object for this connection if the URL for it points to a JAR file entry, null otherwise.
 java.security.cert.Certificate[] getCertificates()
          Enabled: Return the Certificate object for this connection if the URL for it points to a JAR file entry, null otherwise.
 String getEntryName()
          Enabled: Return the entry name for this connection.
 java.util.jar.JarEntry getJarEntry()
          Enabled: Return the JAR entry object for this connection, if any.
abstract  java.util.jar.JarFile getJarFile()
          Enabled: Return the JAR file for this connection.
 URL getJarFileURL()
          Enabled: Returns the URL for the Jar file for this connection.
 java.util.jar.Attributes getMainAttributes()
          Enabled: Returns the main Attributes for the JAR file for this connection.
 java.util.jar.Manifest getManifest()
          Enabled: Returns the Manifest for this connection, or null if none.
private  void parseSpecs(URL url)
           
 
Methods inherited from class java.net.URLConnection
addRequestProperty, connect, getAllowUserInteraction, getContent, getContent, getContentEncoding, getContentHandler, getContentLength, getContentType, getDate, getDefaultAllowUserInteraction, getDefaultRequestProperty, getDefaultUseCaches, getDoInput, getDoOutput, getExpiration, getFileNameMap, getHeaderField, getHeaderField, getHeaderFieldDate, getHeaderFieldInt, getHeaderFieldKey, getHeaderFields, getIfModifiedSince, getInputStream, getLastModified, getOutputStream, getPermission, getRequestProperties, getRequestProperty, getURL, getUseCaches, guessContentTypeFromName, guessContentTypeFromStream, setAllowUserInteraction, setContentHandlerFactory, setDefaultAllowUserInteraction, setDefaultRequestProperty, setDefaultUseCaches, setDoInput, setDoOutput, setFileNameMap, setIfModifiedSince, setRequestProperty, setUseCaches, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

jarFileURL

private URL jarFileURL

entryName

private String entryName

jarFileURLConnection

protected URLConnection jarFileURLConnection
The connection to the JAR file URL, if the connection has been initiated. This should be set by connect.

Constructor Detail

JarURLConnection

protected JarURLConnection(URL url)
                    throws MalformedURLException
Creates the new JarURLConnection to the specified URL.

Parameters:
url - the URL
Throws:
MalformedURLException - if no legal protocol could be found in a specification string or the string could not be parsed.
Method Detail

parseSpecs

private void parseSpecs(URL url)
                 throws MalformedURLException
MalformedURLException

getJarFileURL

public URL getJarFileURL()
Enabled: Returns the URL for the Jar file for this connection.

Returns:
the URL for the Jar file for this connection.

getEntryName

public String getEntryName()
Enabled: Return the entry name for this connection. This method returns null if the JAR file URL corresponding to this connection points to a JAR file and not a JAR file entry.

Returns:
the entry name for this connection, if any.

getJarFile

public abstract java.util.jar.JarFile getJarFile()
                                          throws IOException
Enabled: Return the JAR file for this connection. The returned object is not modifiable, and will throw UnsupportedOperationException if the caller attempts to modify it.

Returns:
the JAR file for this connection. If the connection is a connection to an entry of a JAR file, the JAR file object is returned
IOException
See Also:
URLConnection.connect()

getManifest

public java.util.jar.Manifest getManifest()
                                   throws IOException
Enabled: Returns the Manifest for this connection, or null if none. The returned object is not modifiable, and will throw UnsupportedOperationException if the caller attempts to modify it.

Returns:
the manifest object corresponding to the JAR file object for this connection.
IOException
See Also:
getJarFile()

getJarEntry

public java.util.jar.JarEntry getJarEntry()
                                   throws IOException
Enabled: Return the JAR entry object for this connection, if any. This method returns null if the JAR file URL corresponding to this connection points to a JAR file and not a JAR file entry. The returned object is not modifiable, and will throw UnsupportedOperationException if the caller attempts to modify it.

Returns:
the JAR entry object for this connection, or null if the JAR URL for this connection points to a JAR file.
IOException
See Also:
getJarFile(), getJarEntry()

getAttributes

public java.util.jar.Attributes getAttributes()
                                       throws IOException
Enabled: Return the Attributes object for this connection if the URL for it points to a JAR file entry, null otherwise.

Returns:
the Attributes object for this connection if the URL for it points to a JAR file entry, null otherwise.
IOException
See Also:
getJarEntry()

getMainAttributes

public java.util.jar.Attributes getMainAttributes()
                                           throws IOException
Enabled: Returns the main Attributes for the JAR file for this connection.

Returns:
the main Attributes for the JAR file for this connection.
IOException
See Also:
getJarFile(), getManifest()

getCertificates

public java.security.cert.Certificate[] getCertificates()
                                                 throws IOException
Enabled: Return the Certificate object for this connection if the URL for it points to a JAR file entry, null otherwise. This method can only be called once the connection has been completely verified by reading from the input stream until the end of the stream has been reached. Otherwise, this method will return null

Returns:
the Certificate object for this connection if the URL for it points to a JAR file entry, null otherwise.
IOException
See Also:
getJarEntry()


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