org.eclipse.update.core
Class ContentReference

java.lang.Object
  |
  +--org.eclipse.update.core.ContentReference

Direct Known Subclasses:

JarContentReference, JarEntryContentReference

public class ContentReference

extends Object

Content reference implements a general access wrapper to feature and site content. The reference specifies a "symbolic" path identifier for the content, and the actual reference as a file, or a URL.

This class may be instantiated or subclassed by clients.

Since:

2.0

See Also:

JarContentReference, JarEntryContentReference

Field Summary

static long

UNKNOWN_SIZE Unknown size indication

Constructor Summary

ContentReference(String id, File file)
Create content reference from file.

ContentReference(String id, URL url)
Create content reference from URL.

Method Summary

File	asFile() Returns the content reference as a file.
URL	asURL() Returns the content reference as a URL.
ContentReference	createContentReference(String id, File file) A factory method to create a content reference of the same type.
String	getIdentifier() Retrieves the "symbolic" path identifier for the reference.
long	getInputSize() Returns the size of the referenced input, if it can be determined.
InputStream	getInputStream() Creates an input stream for the reference.
boolean	isLocalReference() Indicates whether the reference is a local file reference.
String	toString() Return string representation of this reference.

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN_SIZE

public static final long UNKNOWN_SIZE

Unknown size indication

Since:

2.0

See Also:

Constant Field Values

Constructor Detail

ContentReference

public ContentReference(String id,
                        URL url)

Create content reference from URL.

Parameters:

id - "symbolic" path identifier

url - actual referenced URL

Since:

2.0

ContentReference

public ContentReference(String id,
                        File file)

Create content reference from file.

Parameters:

id - "symbolic" path identifier

file - actual referenced file

Since:

2.0

Method Detail

createContentReference

public ContentReference createContentReference(String id,
                                               File file)

A factory method to create a content reference of the same type.

Parameters:

id - "symbolic" path identifier

file - actual referenced file

Returns:

content reference of the same type

Since:

2.0

getIdentifier

public String getIdentifier()

Retrieves the "symbolic" path identifier for the reference.

Returns:

"symbolic" path identifier

Since:

2.0

getInputStream

public InputStream getInputStream()
                           throws IOException

Creates an input stream for the reference.

Returns:

input stream

Throws:

IOException - unable to create stream

Since:

2.0

getInputSize

public long getInputSize()
                  throws IOException

Returns the size of the referenced input, if it can be determined.

Returns:

input size, or @see #UNKNOWN_SIZE if size cannot be determined.

IOException

Since:

2.0

isLocalReference

public boolean isLocalReference()

Indicates whether the reference is a local file reference.

Returns:

true if the reference is local, otherwise false

Since:

2.0

asFile

public File asFile()
            throws IOException

Returns the content reference as a file. Note, that this method does not cause the file to be downloaded if it is not already local.

Returns:

reference as file

Throws:

IOException - reference cannot be returned as file

Since:

2.0

asURL

public URL asURL()
          throws IOException

Returns the content reference as a URL.

Returns:

reference as URL

Throws:

IOException - reference cannot be returned as URL

Since:

2.0

toString

public String toString()

Return string representation of this reference.

Overrides:

toString in class Object

Returns:

string representation

Since:

2.0