FilePathMem (H2 Database Engine wt-1.0.1 API)

java.lang.Object
- org.h2.store.fs.FilePath
- - org.h2.store.fs.FilePathMem

```
public class FilePathMem
extends FilePath
```
This file system keeps files fully in memory. There is an option to compress file blocks to save memory.

字段概要
- 从类继承的字段 org.h2.store.fs.FilePath
  name

构造器概要

构造器
构造器和说明

FilePathMem()

构造器
构造器和说明
`FilePathMem()`

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法和说明
`boolean`	`canWrite()` Check if the file is writable.
`void`	`createDirectory()` Create a directory (all required parent directories already exist).
`boolean`	`createFile()` Create a new file.
`void`	`delete()` Delete a file or directory if it exists.
`boolean`	`exists()` Checks if a file exists.
`protected static String`	`getCanonicalPath(String fileName)` Get the canonical path for this file name.
`FilePathMem`	`getParent()` Get the parent directory of a file or directory.
`FilePathMem`	`getPath(String path)` Convert a file to a path.
`String`	`getScheme()` Get the scheme (prefix) for this file provider.
`boolean`	`isAbsolute()` Check if the file name includes a path.
`boolean`	`isDirectory()` Check if it is a file or a directory.
`long`	`lastModified()` Get the last modified date of a file
`void`	`moveTo(FilePath newName, boolean atomicReplace)` Rename a file if this is allowed.
`List<FilePath>`	`newDirectoryStream()` List the files and directories in the given directory.
`InputStream`	`newInputStream()` Create an input stream to read from the file.
`OutputStream`	`newOutputStream(boolean append)` Create an output stream to write into the file.
`FileChannel`	`open(String mode)` Open a random access file object.
`boolean`	`setReadOnly()` Disable the ability to write.
`long`	`size()` Get the size of a file in bytes
`FilePathMem`	`toRealPath()` Normalize a file name.

从类继承的方法 org.h2.store.fs.FilePath
createTempFile, get, getName, getNextTempFileNamePart, register, toString, unregister, unwrap

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - FilePathMem
```
public FilePathMem()
```
- 方法详细资料
  - getPath
```
public FilePathMem getPath(String path)
```
    从类复制的说明: FilePath
    
    Convert a file to a path. This is similar to java.nio.file.spi.FileSystemProvider.getPath, but may return an object even if the scheme doesn't match in case of the the default file provider.
    
    指定者:
    
    getPath 在类中 FilePath
    
    参数:
    
    path - the path
    
    返回:
    
    the file path object
  - size
```
public long size()
```
    从类复制的说明: FilePath
    
    Get the size of a file in bytes
    
    指定者:
    
    size 在类中 FilePath
    
    返回:
    
    the size in bytes
  - moveTo
```
public void moveTo(FilePath newName,
                   boolean atomicReplace)
```
    从类复制的说明: FilePath
    
    Rename a file if this is allowed.
    
    指定者:
    
    moveTo 在类中 FilePath
    
    参数:
    
    newName - the new fully qualified file name
    
    atomicReplace - whether the move should be atomic, and the target file should be replaced if it exists and replacing is possible
  - createFile
```
public boolean createFile()
```
    从类复制的说明: FilePath
    
    Create a new file.
    
    指定者:
    
    createFile 在类中 FilePath
    
    返回:
    
    true if creating was successful
  - exists
```
public boolean exists()
```
    从类复制的说明: FilePath
    
    Checks if a file exists.
    
    指定者:
    
    exists 在类中 FilePath
    
    返回:
    
    true if it exists
  - delete
```
public void delete()
```
    从类复制的说明: FilePath
    
    Delete a file or directory if it exists. Directories may only be deleted if they are empty.
    
    指定者:
    
    delete 在类中 FilePath
  - newDirectoryStream
```
public List<FilePath> newDirectoryStream()
```
    从类复制的说明: FilePath
    
    List the files and directories in the given directory.
    
    指定者:
    
    newDirectoryStream 在类中 FilePath
    
    返回:
    
    the list of fully qualified file names
  - setReadOnly
```
public boolean setReadOnly()
```
    从类复制的说明: FilePath
    
    Disable the ability to write.
    
    指定者:
    
    setReadOnly 在类中 FilePath
    
    返回:
    
    true if the call was successful
  - canWrite
```
public boolean canWrite()
```
    从类复制的说明: FilePath
    
    Check if the file is writable.
    
    指定者:
    
    canWrite 在类中 FilePath
    
    返回:
    
    if the file is writable
  - getParent
```
public FilePathMem getParent()
```
    从类复制的说明: FilePath
    
    Get the parent directory of a file or directory.
    
    指定者:
    
    getParent 在类中 FilePath
    
    返回:
    
    the parent directory name
  - isDirectory
```
public boolean isDirectory()
```
    从类复制的说明: FilePath
    
    Check if it is a file or a directory.
    
    指定者:
    
    isDirectory 在类中 FilePath
    
    返回:
    
    true if it is a directory
  - isAbsolute
```
public boolean isAbsolute()
```
    从类复制的说明: FilePath
    
    Check if the file name includes a path.
    
    指定者:
    
    isAbsolute 在类中 FilePath
    
    返回:
    
    if the file name is absolute
  - toRealPath
```
public FilePathMem toRealPath()
```
    从类复制的说明: FilePath
    
    Normalize a file name.
    
    指定者:
    
    toRealPath 在类中 FilePath
    
    返回:
    
    the normalized file name
  - lastModified
```
public long lastModified()
```
    从类复制的说明: FilePath
    
    Get the last modified date of a file
    
    指定者:
    
    lastModified 在类中 FilePath
    
    返回:
    
    the last modified date
  - createDirectory
```
public void createDirectory()
```
    从类复制的说明: FilePath
    
    Create a directory (all required parent directories already exist).
    
    指定者:
    
    createDirectory 在类中 FilePath
  - newOutputStream
```
public OutputStream newOutputStream(boolean append)
                             throws IOException
```
    从类复制的说明: FilePath
    
    Create an output stream to write into the file.
    
    指定者:
    
    newOutputStream 在类中 FilePath
    
    参数:
    
    append - if true, the file will grow, if false, the file will be truncated first
    
    返回:
    
    the output stream
    
    抛出:
    
    IOException
  - newInputStream
```
public InputStream newInputStream()
```
    从类复制的说明: FilePath
    
    Create an input stream to read from the file.
    
    指定者:
    
    newInputStream 在类中 FilePath
    
    返回:
    
    the input stream
  - open
```
public FileChannel open(String mode)
```
    从类复制的说明: FilePath
    
    Open a random access file object.
    
    指定者:
    
    open 在类中 FilePath
    
    参数:
    
    mode - the access mode. Supported are r, rw, rws, rwd
    
    返回:
    
    the file object
  - getCanonicalPath
```
protected static String getCanonicalPath(String fileName)
```
    Get the canonical path for this file name.
    
    参数:
    
    fileName - the file name
    
    返回:
    
    the canonical path
  - getScheme
```
public String getScheme()
```
    从类复制的说明: FilePath
    
    Get the scheme (prefix) for this file provider. This is similar to java.nio.file.spi.FileSystemProvider.getScheme.
    
    指定者:
    
    getScheme 在类中 FilePath
    
    返回:
    
    the scheme

类 FilePathMem

字段概要

从类继承的字段 org.h2.store.fs.FilePath

构造器概要

方法概要

从类继承的方法 org.h2.store.fs.FilePath

从类继承的方法 java.lang.Object

构造器详细资料

FilePathMem

方法详细资料

getPath

size

moveTo

createFile

exists

delete

newDirectoryStream

setReadOnly

canWrite

getParent

isDirectory

isAbsolute

toRealPath

lastModified

createDirectory

newOutputStream

newInputStream

open

getCanonicalPath

getScheme