public class HdfsFileObject extends AbstractFileObject<HdfsFileSystem>
| Modifier | Constructor and Description |
|---|---|
protected |
HdfsFileObject(AbstractFileName name,
HdfsFileSystem fs,
org.apache.hadoop.fs.FileSystem hdfs,
org.apache.hadoop.fs.Path p)
Constructs a new HDFS FileObject
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
canRenameTo(FileObject newfile)
Queries the object if a simple rename to the filename of
newfile is possible. |
protected void |
doAttach()
Attaches this file object to its file resource.
|
protected Map<String,Object> |
doGetAttributes()
Returns the attributes of this file.
|
protected long |
doGetContentSize()
Returns the size of the file content (in bytes).
|
protected InputStream |
doGetInputStream()
Creates an input stream to read the file content from.
|
protected long |
doGetLastModifiedTime()
Returns the last modified time of this file.
|
protected RandomAccessContent |
doGetRandomAccessContent(RandomAccessMode mode)
Creates access to the file for random i/o.
|
protected FileType |
doGetType()
Determines the type of this file.
|
protected boolean |
doIsHidden()
Determines if this file is hidden.
|
protected boolean |
doIsReadable()
Determines if this file can be read.
|
protected boolean |
doIsWriteable()
Determines if this file can be written to.
|
protected String[] |
doListChildren()
Lists the children of this file.
|
protected FileObject[] |
doListChildrenResolved()
Lists the children of this file.
|
protected void |
doRemoveAttribute(String attrName)
Removes an attribute of this file.
|
protected void |
doSetAttribute(String attrName,
Object value)
Sets an attribute of this file.
|
protected boolean |
doSetLastModifiedTime(long modtime)
Sets the last modified time of this file.
|
boolean |
exists()
Determines if the file exists.
|
childrenChanged, close, compareTo, copyFrom, createFile, createFolder, delete, delete, deleteAll, doCreateFileContent, doCreateFolder, doDelete, doDetach, doGetCertificates, doGetOutputStream, doIsExecutable, doIsSameFile, doRename, doSetExecutable, doSetReadable, doSetWritable, endOutput, finalize, findFiles, findFiles, getAbstractFileSystem, getChild, getChildren, getContent, getFileContentInfoFactory, getFileOperations, getFileSystem, getInputStream, getName, getOutputStream, getOutputStream, getParent, getPublicURIString, getRandomAccessContent, getType, getURL, handleChanged, handleCreate, handleDelete, holdObject, injectType, isAttached, isContentOpen, isExecutable, isFile, isFolder, isHidden, isReadable, isSameFile, isWriteable, iterator, listFiles, moveTo, notifyAllStreamsClosed, onChange, onChildrenChanged, refresh, resolveFile, resolveFile, setExecutable, setReadable, setWritable, toStringclone, equals, getClass, hashCode, notify, notifyAll, wait, wait, waitforEach, spliteratorprotected HdfsFileObject(AbstractFileName name, HdfsFileSystem fs, org.apache.hadoop.fs.FileSystem hdfs, org.apache.hadoop.fs.Path p)
name - FileNamefs - HdfsFileSystem instancehdfs - Hadoop FileSystem instancep - Path to the file in HDFSpublic boolean canRenameTo(FileObject newfile)
AbstractFileObjectnewfile is possible.canRenameTo in interface FileObjectcanRenameTo in class AbstractFileObject<HdfsFileSystem>newfile - the new filenameAbstractFileObject.canRenameTo(org.apache.commons.vfs2.FileObject)protected void doAttach()
throws Exception
AbstractFileObjectThis method is called before any of the doBlah() or onBlah() methods. Sub-classes can use this method to perform lazy initialisation.
This implementation does nothing.
doAttach in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doAttach()protected Map<String,Object> doGetAttributes() throws Exception
AbstractFileObjectAbstractFileObject.doGetType() does not return
FileType.IMAGINARY.
This implementation always returns an empty map.
doGetAttributes in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doGetAttributes()protected long doGetContentSize()
throws Exception
AbstractFileObjectAbstractFileObject.doGetType() returns
FileType.FILE.doGetContentSize in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doGetContentSize()protected InputStream doGetInputStream() throws Exception
AbstractFileObjectAbstractFileObject.doGetType() returns
FileType.FILE.
It is guaranteed that there are no open output streams for this file when this method is called.
The returned stream does not have to be buffered.
doGetInputStream in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doGetInputStream()protected long doGetLastModifiedTime()
throws Exception
AbstractFileObjectAbstractFileObject.doGetType() does not return
FileType.IMAGINARY.
This implementation throws an exception.
doGetLastModifiedTime in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doGetLastModifiedTime()protected RandomAccessContent doGetRandomAccessContent(RandomAccessMode mode) throws Exception
AbstractFileObjectAbstractFileObject.doGetType() returns FileType.FILE.
It is guaranteed that there are no open output streams for this file when this method is called.
doGetRandomAccessContent in class AbstractFileObject<HdfsFileSystem>mode - The mode to access the file.Exception - if an error occurs.(org.apache.commons.vfs2.util.RandomAccessMode)protected FileType doGetType() throws Exception
AbstractFileObjectdoGetType in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doGetType()protected boolean doIsHidden()
throws Exception
AbstractFileObjectAbstractFileObject.doGetType() does not return
FileType.IMAGINARY.
This implementation always returns false.
doIsHidden in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doIsHidden()protected boolean doIsReadable()
throws Exception
AbstractFileObjectAbstractFileObject.doGetType() does not return
FileType.IMAGINARY.
This implementation always returns true.
doIsReadable in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doIsReadable()protected boolean doIsWriteable()
throws Exception
AbstractFileObjectAbstractFileObject.doGetType() does not return
FileType.IMAGINARY.
This implementation always returns true.
doIsWriteable in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doIsWriteable()protected String[] doListChildren() throws Exception
AbstractFileObjectAbstractFileObject.doGetType() returns FileType.FOLDER. The return
value of this method is cached, so the implementation can be expensive.doListChildren in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doListChildren()protected FileObject[] doListChildrenResolved() throws Exception
AbstractFileObject
Is only called if AbstractFileObject.doGetType() returns FileType.FOLDER.
The return value of this method is cached, so the implementation can be expensive.
Other than doListChildren you could return FileObject's to e.g. reinitialize the type of the file.
(Introduced for Webdav: "permission denied on resource" during getType())
doListChildrenResolved in class AbstractFileObject<HdfsFileSystem>Exception - if an error occurs.AbstractFileObject.doListChildrenResolved()protected void doRemoveAttribute(String attrName) throws Exception
AbstractFileObject
Is only called if AbstractFileObject.doGetType() does not return FileType.IMAGINARY.
This implementation throws an exception.
doRemoveAttribute in class AbstractFileObject<HdfsFileSystem>attrName - The name of the attribute to remove.Exception - if an error occurs.AbstractFileObject.doRemoveAttribute(java.lang.String)protected void doSetAttribute(String attrName, Object value) throws Exception
AbstractFileObject
Is only called if AbstractFileObject.doGetType() does not return FileType.IMAGINARY.
This implementation throws an exception.
doSetAttribute in class AbstractFileObject<HdfsFileSystem>attrName - The attribute name.value - The value to be associated with the attribute name.Exception - if an error occurs.AbstractFileObject.doSetAttribute(java.lang.String, java.lang.Object)protected boolean doSetLastModifiedTime(long modtime)
throws Exception
AbstractFileObject
Is only called if AbstractFileObject.doGetType() does not return FileType.IMAGINARY.
This implementation throws an exception.
doSetLastModifiedTime in class AbstractFileObject<HdfsFileSystem>modtime - The last modification time.Exception - Any Exception thrown is wrapped in FileSystemException.AbstractFileObject.doSetLastModifiedTime(long)public boolean exists()
throws FileSystemException
AbstractFileObjectexists in interface FileObjectexists in class AbstractFileObject<HdfsFileSystem>FileSystemException - if an error occurs.AbstractFileObject.exists()Copyright © 2002–2017 The Apache Software Foundation. All rights reserved.