Class CombinedResource

java.lang.Object

org.eclipse.jetty.util.resource.Resource

org.eclipse.jetty.util.resource.CombinedResource

All Implemented Interfaces:

Iterable<Resource>

public class CombinedResource
extends Resource

Multiple Resource directories presented as a single overlayed Resource directory.

This class differs from a List<Resource>, as a relative path can resolve to only a single Resource in a CombinedResource, whilst it may resolve to multiple in a List<Resource>.

Method Summary

Modifier and Type	Method	Description
boolean	contains(Resource other)	Return true if this resource deeply contains the other Resource.
void	copyTo(Path destination)	Copy the Resource to the new destination file or directory.
boolean	equals(Object o)
boolean	exists()	Equivalent to Files.exists(Path, LinkOption...) with the following parameters: Resource.getPath() and LinkOption.NOFOLLOW_LINKS.
String	getFileName()	The file name of the resource.
String	getName()	The full name of the resource.
Path	getPath()	Return the Path corresponding to this resource.
Path	getPathTo(Resource other)	Get the relative path from this Resource to a possibly contained resource.
URI	getRealURI()	The real URI of the resource.
List<Resource>	getResources()	Retrieves the resource collection's resources.
URI	getURI()	URI representing the resource.
int	hashCode()
boolean	isAlias()
boolean	isDirectory()	Return true if resource represents a directory of potential resources.
boolean	isReadable()	True if the resource is readable.
boolean	isSameFile(Path path)
Iterator<Resource>	iterator()	Return an Iterator of all Resource's referenced in this Resource.
Instant	lastModified()	The time the resource was last modified.
long	length()	Length of the resource.
List<Resource>	list()	List of contents of a directory Resource.
Resource	resolve(String subUriPath)	Resolves a path against the resource collection.
String	toString()

Methods inherited from class Resource

dump, getAllResources, isContainedIn, newInputStream, newReadableByteChannel

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Iterable

forEach, spliterator

Method Details

getResources

public List<Resource> getResources()

Retrieves the resource collection's resources.

Returns:

the resource collection

resolve

public Resource resolve(String subUriPath)

Resolves a path against the resource collection.

Specified by:

resolve in class Resource

Parameters:

subUriPath - The path segment to resolve

Returns:

The resulting resource :

• is a file that exists in at least one of the collection, then the first one found is returned
• is a directory that exists in at exactly one of the collection, then that simple directory resource is returned
• is a directory that exists in several of the collection, then a ResourceCollection of those directories is returned
• is null if not found in any entry in this collection

exists

public boolean exists()

Description copied from class: Resource

Equivalent to Files.exists(Path, LinkOption...) with the following parameters: Resource.getPath() and LinkOption.NOFOLLOW_LINKS.

Overrides:

exists in class Resource

Returns:

true if the represented resource exists.

getPath

public Path getPath()

Description copied from class: Resource

Return the Path corresponding to this resource.

Specified by:

getPath in class Resource

Returns:

the path or null if there is no Path representation.

getName

public String getName()

Description copied from class: Resource

The full name of the resource.

Specified by:

getName in class Resource

Returns:

the full name of the resource, or null if there is no name for the resource.

getFileName

public String getFileName()

Description copied from class: Resource

The file name of the resource.

This is the last segment of the path.

Specified by:

getFileName in class Resource

Returns:

the filename of the resource, or "" if there are no path segments (eg: path of "/"), or null if resource cannot determine a filename.

See Also:

• Path.getFileName()

getURI

public URI getURI()

Description copied from class: Resource

URI representing the resource.

Specified by:

getURI in class Resource

Returns:

a URI representing the given resource, or null if there is no URI representation of the resource.

isDirectory

public boolean isDirectory()

Description copied from class: Resource

Return true if resource represents a directory of potential resources.

Specified by:

isDirectory in class Resource

Returns:

true if the represented resource is a container/directory.

isReadable

public boolean isReadable()

Description copied from class: Resource

True if the resource is readable.

Specified by:

isReadable in class Resource

Returns:

true if the represented resource exists, and can read from.

lastModified

public Instant lastModified()

Description copied from class: Resource

The time the resource was last modified.

Overrides:

lastModified in class Resource

Returns:

the last modified time instant, or Instant.EPOCH if unable to obtain last modified.

length

public long length()

Description copied from class: Resource

Length of the resource.

Overrides:

length in class Resource

Returns:

the length of the resource in bytes, or -1L if unable to provide a size (such as a directory resource).

iterator

public Iterator<Resource> iterator()

Description copied from class: Resource

Return an Iterator of all Resource's referenced in this Resource.

This is meaningful if you have a CombinedResource, otherwise it will be a single entry Iterator of this resource.

Specified by:

iterator in interface Iterable<Resource>

Overrides:

iterator in class Resource

Returns:

the iterator of Resources.

list

public List<Resource> list()

Description copied from class: Resource

List of contents of a directory Resource.

Ordering is FileSystem dependent, so callers may wish to sort the return value to ensure deterministic behavior.

Overrides:

list in class Resource

Returns:

a mutable list of resources contained in the directory resource, or an empty immutable list if unable to build the list (e.g. the resource is not a directory or not readable).

See Also:

• Resource.isDirectory()
• Resource.isReadable()

copyTo

public void copyTo(Path destination)
            throws IOException

Description copied from class: Resource

Copy the Resource to the new destination file or directory.

If this Resource is a File:

• And the destination does not exist then IO.copyFile(Path, Path) is used.
• And the destination is a File then IO.copyFile(Path, Path) is used.
• And the destination is a Directory then a new Path reference is created in the destination with the same filename as this Resource, which is used via IO.copyFile(Path, Path).

If this Resource is a Directory:

• And the destination does not exist then the destination is created as a directory via Files.createDirectories(Path, FileAttribute[]) before the IO.copyDir(Path, Path) method is used.
• And the destination is a File then this results in an IllegalArgumentException.
• And the destination is a Directory then all files in this Resource directory tree are copied to the destination, using IO.copyFile(Path, Path) maintaining the same directory structure.

If this Resource is not backed by a Path, use Resource.newInputStream():

• And the destination does not exist, copy InputStream to the destination as a new file.
• And the destination is a File, copy InputStream to the existing destination file.
• And the destination is a Directory, copy InputStream to a new destination file in the destination directory based on this the result of Resource.getFileName() as the filename.

Overrides:

copyTo in class Resource

Parameters:

destination - the destination file or directory to use (created if it does not exist).

Throws:

IOException - if unable to copy the resource

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isAlias

public boolean isAlias()

Overrides:

isAlias in class Resource

Returns:

true if this Resource is an alias to another real Resource

getRealURI

public URI getRealURI()

Description copied from class: Resource

The real URI of the resource.

If this Resource is an alias, (Resource.isAlias()), this URI will be different from Resource.getURI(), and will point to the real name/location of the Resource.

Overrides:

getRealURI in class Resource

Returns:

The real URI location of this resource.

toString

public String toString()

Overrides:

toString in class Resource

Returns:

the list of resources

contains

public boolean contains(Resource other)

Description copied from class: Resource

Return true if this resource deeply contains the other Resource. This resource must be a directory or a jar file or any form of resource capable of containing other resources.

Overrides:

contains in class Resource

Parameters:

other - the resource

Returns:

true if this Resource is deeply contains the other Resource, false otherwise

See Also:

• Resource.isContainedIn(Resource)

getPathTo

public Path getPathTo(Resource other)

Description copied from class: Resource

Get the relative path from this Resource to a possibly contained resource.

Overrides:

getPathTo in class Resource

Parameters:

other - The other resource that may be contained in this resource

Returns:

a relative Path representing the path from this resource to the other resource, or null if not able to represent other resources as relative to this resource

isSameFile

public boolean isSameFile(Path path)

Overrides:

isSameFile in class Resource