libcore.net.url

Class JarURLConnectionImpl

java.lang.Object

java.net.URLConnection

java.net.JarURLConnection

libcore.net.url.JarURLConnectionImpl

public class JarURLConnectionImpl
extends JarURLConnection

This subclass extends URLConnection.

This class is responsible for connecting and retrieving resources from a Jar file which can be anywhere that can be referred to by an URL.

Field Summary

Fields inherited from class java.net.JarURLConnection

jarFileURLConnection

Fields inherited from class java.net.URLConnection

allowUserInteraction, connected, doInput, doOutput, ifModifiedSince, url, useCaches

Constructor Summary

Constructors

Constructor and Description
JarURLConnectionImpl(URL url)

Method Summary

Modifier and Type	Method and Description
void	connect() Opens a connection to the resource.
Object	getContent() Returns the object pointed by this URL.
int	getContentLength() Returns the content length of the resource.
String	getContentType() Returns the content type of the resource.
boolean	getDefaultUseCaches() Returns the default setting whether this connection allows using caches.
InputStream	getInputStream() Creates an input stream for reading from this URL Connection.
JarEntry	getJarEntry() Returns the JarEntry of the entry referenced by this URLConnection.
JarFile	getJarFile() Returns the Jar file referred by this URLConnection.
Permission	getPermission() Returns the permission, in this case the subclass, FilePermission object which represents the permission necessary for this URLConnection to establish the connection.
boolean	getUseCaches() Returns the value of the flag which specifies whether this URLConnection allows to use caches.
void	setDefaultUseCaches(boolean defaultusecaches) Sets the default value for the flag indicating whether this connection allows to use caches.
void	setUseCaches(boolean usecaches) Sets the flag indicating whether this connection allows to use caches or not.

Methods inherited from class java.net.JarURLConnection

getAttributes, getCertificates, getEntryName, getJarFileURL, getMainAttributes, getManifest

Methods inherited from class java.net.URLConnection

addRequestProperty, getAllowUserInteraction, getConnectTimeout, getContent, getContentEncoding, getDate, getDefaultAllowUserInteraction, getDefaultRequestProperty, getDoInput, getDoOutput, getExpiration, getFileNameMap, getHeaderField, getHeaderField, getHeaderFieldDate, getHeaderFieldInt, getHeaderFieldKey, getHeaderFields, getIfModifiedSince, getLastModified, getOutputStream, getReadTimeout, getRequestProperties, getRequestProperty, getURL, guessContentTypeFromName, guessContentTypeFromStream, setAllowUserInteraction, setConnectTimeout, setContentHandlerFactory, setDefaultAllowUserInteraction, setDefaultRequestProperty, setDoInput, setDoOutput, setFileNameMap, setIfModifiedSince, setReadTimeout, setRequestProperty, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

JarURLConnectionImpl

public JarURLConnectionImpl(URL url)
                     throws MalformedURLException,
                            IOException

Parameters:

url - the URL of the JAR

Throws:

MalformedURLException - if the URL is malformed

IOException - if there is a problem opening the connection.

Method Detail

connect

public void connect()
             throws IOException

Description copied from class: URLConnection

Opens a connection to the resource. This method will not reconnect to a resource after the initial connection has been closed.

Specified by:

connect in class URLConnection

Throws:

IOException - if an error occurs while connecting to the resource.

See Also:

URLConnection.connect()

getJarFile

public JarFile getJarFile()
                   throws IOException

Returns the Jar file referred by this URLConnection.

Specified by:

getJarFile in class JarURLConnection

Returns:

the referenced JarFile object.

Throws:

IOException - thrown if an IO error occurs while connecting to the resource.

getJarEntry

public JarEntry getJarEntry()
                     throws IOException

Returns the JarEntry of the entry referenced by this URLConnection.

Overrides:

getJarEntry in class JarURLConnection

Returns:

the JarEntry referenced

Throws:

IOException - if an IO error occurs while getting the entry

getInputStream

public InputStream getInputStream()
                           throws IOException

Creates an input stream for reading from this URL Connection.

Overrides:

getInputStream in class URLConnection

Returns:

the input stream

Throws:

IOException - if an IO error occurs while connecting to the resource.

getContentType

public String getContentType()

Returns the content type of the resource. For jar file itself "x-java/jar" should be returned, for jar entries the content type of the entry should be returned. Returns non-null results ("content/unknown" for unknown types).

Overrides:

getContentType in class URLConnection

Returns:

the content type

getContentLength

public int getContentLength()

Returns the content length of the resource. Test cases reveal that if the URL is referring to a Jar file, this method answers a content-length returned by URLConnection. For a jar entry it returns the entry's size if it can be represented as an int. Otherwise, it will return -1.

Overrides:

getContentLength in class URLConnection

getContent

public Object getContent()
                  throws IOException

Returns the object pointed by this URL. If this URLConnection is pointing to a Jar File (no Jar Entry), this method will return a JarFile If there is a Jar Entry, it will return the object corresponding to the Jar entry content type.

Overrides:

getContent in class URLConnection

Returns:

a non-null object

Throws:

IOException - if an IO error occurred

See Also:

ContentHandler, ContentHandlerFactory, IOException, URLConnection.setContentHandlerFactory(ContentHandlerFactory)

getPermission

public Permission getPermission()
                         throws IOException

Returns the permission, in this case the subclass, FilePermission object which represents the permission necessary for this URLConnection to establish the connection.

Overrides:

getPermission in class URLConnection

Returns:

the permission required for this URLConnection.

Throws:

IOException - thrown when an IO exception occurs while creating the permission.

getUseCaches

public boolean getUseCaches()

Description copied from class: URLConnection

Returns the value of the flag which specifies whether this URLConnection allows to use caches.

Overrides:

getUseCaches in class URLConnection

Returns:

true if using caches is allowed, false otherwise.

setUseCaches

public void setUseCaches(boolean usecaches)

Description copied from class: URLConnection

Sets the flag indicating whether this connection allows to use caches or not. This method can only be called prior to the connection establishment.

Overrides:

setUseCaches in class URLConnection

Parameters:

usecaches - the value of the flag to be set.

See Also:

URLConnection.useCaches

getDefaultUseCaches

public boolean getDefaultUseCaches()

Description copied from class: URLConnection

Returns the default setting whether this connection allows using caches.

Overrides:

getDefaultUseCaches in class URLConnection

Returns:

the value of the default setting defaultUseCaches.

See Also:

URLConnection.useCaches

setDefaultUseCaches

public void setDefaultUseCaches(boolean defaultusecaches)

Description copied from class: URLConnection

Sets the default value for the flag indicating whether this connection allows to use caches. Existing URLConnections are unaffected.

Overrides:

setDefaultUseCaches in class URLConnection

Parameters:

defaultusecaches - the default value of the flag to be used for new connections.

See Also:

URLConnection.useCaches