public class HttpURLFileSystemHelper extends URLFileSystemHelper
HttpURLFileSystemHelper
class provides an implementation of URLFileSystemHelper
for http URLs.Modifier | Constructor and Description |
---|---|
|
HttpURLFileSystemHelper()
Create the default version of this operation that accesses information using a GET.
|
protected |
HttpURLFileSystemHelper(java.lang.String requestMethod, java.lang.String quickMethod)
Allow the client to specify the HTTP methods used for the request and metadata operations.
|
Modifier and Type | Method and Description |
---|---|
boolean |
canCreate(java.net.URL url)
Tests whether the application can create the resource at the specified
URL . |
boolean |
exists(java.net.URL url)
Returns
true if the specified URL points to a resource that currently exists; returns false otherwise. |
long |
getLength(java.net.URL url)
Returns the number of bytes contained in the resource that the specified
URL points to. |
java.net.URL |
getParent(java.net.URL url)
Returns the
URL representing the parent directory of the specified URL . |
protected int |
getPort(java.net.URL url) |
java.lang.String |
getSystemDisplayName(java.net.URL url)
Returns the name of a resource as it would be displayed in a system file browser.
|
long |
lastModified(java.net.URL url)
Returns the last modification time (timestamp) of the resource indicated by the specified
URL in milliseconds since 00:00:00 GMT, Jan 1, 1970. |
protected java.net.URLConnection |
openConnection(java.net.URL url)
Open a HttpURConnection, it might be required to clear up the protocol of the URL if we are using one of the extended types such as http-OPTIONS.
|
java.io.InputStream |
openInputStream(java.net.URL url)
Opens an
InputStream on the specified URL . |
addURLFileSystemListener, appendRelativePath, areEqual, areEqualPathElems, canDelete, canonicalize, canRead, canWrite, code, convertSuffix, createReader, createTempFile, delete, ensureSuffix, equals, getBaseParent, getDefaultIcon, getFileName, getName, getPath, getPathNoExt, getPlatformPathName, getSuffix, getSystemIcon, getTempDirectory, hashCode, hasSuffix, haveSameAuthority, haveSameHost, haveSamePath, haveSamePort, haveSameProtocol, haveSameQuery, haveSameRef, haveSameUserInfo, isBaseURLFor, isDirectory, isDirectoryPath, isHidden, isLocal, isReadOnly, isRegularFile, isValid, list, list, list, listRoots, ls, ls, lsCached, lsCached, mkdir, mkdirs, openOutputStream, removeURLFileSystemListener, rename, setLastModified, setReadOnly, toDisplayString, toEncodedString, toEncodedString, toRelativeSpec, toRelativeSpec, verifyList
public HttpURLFileSystemHelper()
protected HttpURLFileSystemHelper(java.lang.String requestMethod, java.lang.String quickMethod)
public java.lang.String getSystemDisplayName(java.net.URL url)
getSystemDisplayName
in class URLFileSystemHelper
url
- the URL
of the resourceURLFileSystemHelper.getSystemIcon(URL)
public long getLength(java.net.URL url)
URL
points to. If the length cannot be determined, -1
is returned.
The default implementation attempts to get the content length from the URLConnection
associated with the URL
. If that fails for some reason (e.g. the resource does not exist, there was some other an I/O exception, etc.), -1
is returned.
getLength
in class URLFileSystemHelper
URLConnection
public long lastModified(java.net.URL url)
URL
in milliseconds since 00:00:00 GMT, Jan 1, 1970. If the timestamp can't be determined, -1
is returned.
The default implementation attemps to get the last modified time from the URLConnection
associated with the URL
. If that fails for some reason (e.g. the resource does not exist, there was some other I/O exception, etc.), -1
is returned.
lastModified
in class URLFileSystemHelper
URLConnection
public boolean exists(java.net.URL url)
URLFileSystemHelper
true
if the specified URL
points to a resource that currently exists; returns false
otherwise.
The default implementation simply returns false
without doing anything.
exists
in class URLFileSystemHelper
public boolean canCreate(java.net.URL url)
URL
.canCreate
in class URLFileSystemHelper
true
if the resource at the specified URL
exists or can be created; false
otherwise.public java.net.URL getParent(java.net.URL url)
URLFileSystemHelper
URL
representing the parent directory of the specified URL
. If there is no parent directory, then null
is returned.
The default implementation returns the value of invoking URLFactory.newURL( url, ".." )
, removing the reference portion of the URL.
getParent
in class URLFileSystemHelper
public java.io.InputStream openInputStream(java.net.URL url) throws java.io.IOException
InputStream
on the specified URL
.
The default implementation attempts to open the InputStream
through the URLConnection
associated with the URL
. If the URLConnection
implementation does not support an InputStream
then an UnknownServiceException
(a runtime exception) will be thrown.
openInputStream
in class URLFileSystemHelper
java.io.FileNotFoundException
- if the resource at the specified URL does not exist.java.io.IOException
- if an I/O error occurs when trying to open the InputStream
.java.net.UnknownServiceException
- if the URLConnection
backing the specified URL
does not support an InputStream
.IOException
, URLConnection
, UnknownServiceException
protected java.net.URLConnection openConnection(java.net.URL url) throws java.io.IOException
url
-java.io.IOException
protected int getPort(java.net.URL url)
getPort
in class URLFileSystemHelper