Package org.apache.tomcat.util.scan

Class ReferenceCountedJar

java.lang.Object

org.apache.tomcat.util.scan.ReferenceCountedJar

All Implemented Interfaces:

AutoCloseable, Jar

public class ReferenceCountedJar
extends Object
implements Jar

This class provides a wrapper around Jar that uses reference counting to close and re-create the wrapped Jar instance as required.

Constructor Summary

Constructors

Constructor	Description
ReferenceCountedJar(URL url)

Method Summary

Modifier and Type	Method	Description
void	close()	Close any resources associated with this JAR.
boolean	exists(String name)	Determine if the given resource in present in the JAR.
InputStream	getEntryInputStream()	Obtains the input stream for the current entry.
String	getEntryName()	Obtains the name of the current entry.
InputStream	getInputStream(String name)	Obtain an InputStream for a given entry in a JAR.
URL	getJarFileURL()
long	getLastModified(String name)	Obtain the last modified time for the given resource in the JAR.
Manifest	getManifest()	Obtain the manifest for the JAR file.
String	getURL(String entry)	Obtain, in String form, the URL for an entry in this JAR.
void	nextEntry()	Moves the internal pointer to the next entry in the JAR.
void	reset()	Resets the internal pointer used to track JAR entries to the beginning of the JAR.

Methods inherited from class java.lang.Object

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

Constructor Details

ReferenceCountedJar

public ReferenceCountedJar(URL url)
                    throws IOException

Throws:

IOException

Method Details

close

public void close()

Description copied from interface: Jar

Close any resources associated with this JAR.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Jar

getJarFileURL

public URL getJarFileURL()

Specified by:

getJarFileURL in interface Jar

Returns:

The URL for accessing the JAR file.

getInputStream

public InputStream getInputStream(String name)
                           throws IOException

Description copied from interface: Jar

Obtain an InputStream for a given entry in a JAR. The caller is responsible for closing the stream.

Specified by:

getInputStream in interface Jar

Parameters:

name - Entry to obtain an InputStream for

Returns:

An InputStream for the specified entry or null if the entry does not exist

Throws:

IOException - if an I/O error occurs while processing the JAR file

getLastModified

public long getLastModified(String name)
                     throws IOException

Description copied from interface: Jar

Obtain the last modified time for the given resource in the JAR.

Specified by:

getLastModified in interface Jar

Parameters:

name - Entry to obtain the modification time for

Returns:

The time (in the same format as System.currentTimeMillis() that the resource was last modified. Returns -1 if the entry does not exist

Throws:

IOException - if an I/O error occurs while processing the JAR file

exists

public boolean exists(String name)
               throws IOException

Description copied from interface: Jar

Determine if the given resource in present in the JAR.

Specified by:

exists in interface Jar

Parameters:

name - Entry to look for

Returns:

true if the entry is present in the JAR, otherwise false

Throws:

IOException - if an I/O error occurs while processing the JAR file

nextEntry

public void nextEntry()

Description copied from interface: Jar

Moves the internal pointer to the next entry in the JAR.

Specified by:

nextEntry in interface Jar

getEntryName

public String getEntryName()

Description copied from interface: Jar

Obtains the name of the current entry.

Specified by:

getEntryName in interface Jar

Returns:

The entry name

getEntryInputStream

public InputStream getEntryInputStream()
                                throws IOException

Description copied from interface: Jar

Obtains the input stream for the current entry.

Specified by:

getEntryInputStream in interface Jar

Returns:

The input stream

Throws:

IOException - If the stream cannot be obtained

getURL

public String getURL(String entry)

Description copied from interface: Jar

Obtain, in String form, the URL for an entry in this JAR. Note that for JARs nested in WAR files, the Tomcat specific war:file:... form will not be used, rather the jar:jar:file:... form (that the JRE does not understand will be used). Note that this means that any code using these URLs will need to understand the jar:jar:file:... form and use the JarFactory to ensure resources are accessed correctly.

Specified by:

getURL in interface Jar

Parameters:

entry - The entry to generate the URL for

Returns:

a URL for the specified entry in the JAR

getManifest

public Manifest getManifest()
                     throws IOException

Description copied from interface: Jar

Obtain the manifest for the JAR file.

Specified by:

getManifest in interface Jar

Returns:

The manifest for this JAR file.

Throws:

IOException - If an I/O error occurs trying to obtain the manifest

reset

public void reset()
           throws IOException

Description copied from interface: Jar

Resets the internal pointer used to track JAR entries to the beginning of the JAR.

Specified by:

reset in interface Jar

Throws:

IOException - If the pointer cannot be reset