JarDBFile (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.io.InputStreamFile<JarStorageFactory>
- - org.apache.derby.impl.io.JarDBFile

All Implemented Interfaces:

StorageFile
```
class JarDBFile
extends InputStreamFile<JarStorageFactory>
```
This class provides a jar file based implementation of the StorageFile interface. It is used by the database engine to access persistent data and transaction logs under the jar subsubprotocol.

Field Summary
- Fields inherited from class org.apache.derby.impl.io.InputStreamFile
  nameStart, path, storageFactory
- Fields inherited from interface org.apache.derby.io.StorageFile
  EXCLUSIVE_FILE_LOCK, EXCLUSIVE_FILE_LOCK_NOT_AVAILABLE, NO_FILE_LOCK_SUPPORT

Constructor Summary

Constructors
Modifier	Constructor	Description
`(package private)`	`JarDBFile(JarDBFile dir, java.lang.String name)`
`(package private)`	`JarDBFile(JarStorageFactory storageFactory, java.lang.String path)`
`private`	`JarDBFile(JarStorageFactory storageFactory, java.lang.String child, int pathLen)`
`(package private)`	`JarDBFile(JarStorageFactory storageFactory, java.lang.String parent, java.lang.String name)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`exists()`	Tests whether the named file exists.
`private java.util.zip.ZipEntry`	`getEntry()`
`java.io.InputStream`	`getInputStream()`	Creates an input stream from a file name.
`(package private) StorageFile`	`getParentDir(int pathLen)`	Get the name of the parent directory if this name includes a parent.
`java.lang.String`	`toString()`	Get the file name for diagnostic purposes.

Methods inherited from class org.apache.derby.impl.io.InputStreamFile
canWrite, createNewFile, delete, deleteAll, equals, getCanonicalPath, getExclusiveFileLock, getName, getOutputStream, getOutputStream, getParentDir, getPath, getRandomAccessFile, hashCode, isDirectory, limitAccessToOwner, list, mkdir, mkdirs, releaseExclusiveFileLock, renameTo, setReadOnly

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - JarDBFile
```
JarDBFile(JarStorageFactory storageFactory,
          java.lang.String path)
```
  - JarDBFile
```
JarDBFile(JarStorageFactory storageFactory,
          java.lang.String parent,
          java.lang.String name)
```
  - JarDBFile
```
JarDBFile(JarDBFile dir,
          java.lang.String name)
```
  - JarDBFile
```
private JarDBFile(JarStorageFactory storageFactory,
                  java.lang.String child,
                  int pathLen)
```
- Method Detail
  - exists
```
public boolean exists()
```
    Tests whether the named file exists.
    
    Specified by:
    
    exists in interface StorageFile
    
    Specified by:
    
    exists in class InputStreamFile<JarStorageFactory>
    
    Returns:
    
    true if the named file exists, false if not.
  - getEntry
```
private java.util.zip.ZipEntry getEntry()
```
  - getParentDir
```
StorageFile getParentDir(int pathLen)
```
    Get the name of the parent directory if this name includes a parent.
    
    Specified by:
    
    getParentDir in class InputStreamFile<JarStorageFactory>
    
    Parameters:
    
    pathLen - the length of the parent's path name.
    
    Returns:
    
    An StorageFile denoting the parent directory of this StorageFile, if it has a parent, null if it does not have a parent.
  - getInputStream
```
public java.io.InputStream getInputStream()
                                   throws java.io.FileNotFoundException
```
    Creates an input stream from a file name.
    
    Specified by:
    
    getInputStream in interface StorageFile
    
    Specified by:
    
    getInputStream in class InputStreamFile<JarStorageFactory>
    
    Returns:
    
    an input stream suitable for reading from the file.
    
    Throws:
    
    java.io.FileNotFoundException - if the file is not found.
  - toString
```
public java.lang.String toString()
```
    Get the file name for diagnostic purposes. Usually the same as getPath().
    
    Overrides:
    
    toString in class InputStreamFile<JarStorageFactory>
    
    Returns:
    
    the file name

Class JarDBFile

Field Summary

Fields inherited from class org.apache.derby.impl.io.InputStreamFile

Fields inherited from interface org.apache.derby.io.StorageFile

Constructor Summary

Method Summary

Methods inherited from class org.apache.derby.impl.io.InputStreamFile

Methods inherited from class java.lang.Object

Constructor Detail

JarDBFile

JarDBFile

JarDBFile

JarDBFile

Method Detail

exists

getEntry

getParentDir

getInputStream

toString