Package org.h2.store.fs.mem

Class FilePathMem

  • Direct Known Subclasses:
    FilePathMemLZF
    public class FilePathMem
extends FilePath
    This file system keeps files fully in memory. There is an option to compress file blocks to save memory.

    • Field Detail

      • MEMORY_FILES

        private static final java.util.TreeMap<java.lang.String,​FileMemData> MEMORY_FILES

      • DIRECTORY

        private static final FileMemData DIRECTORY

    • Constructor Detail

      • FilePathMem

        public FilePathMem()

    • Method Detail

      • getPath

        public FilePathMem getPath​(java.lang.String path)
        Description copied from class: 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 default file provider.
        Specified by:
        getPath in class FilePath
        Parameters:
        path - the path
        Returns:
        the file path object

      • size

        public long size()
        Description copied from class: FilePath
        Get the size of a file in bytes
        Specified by:
        size in class FilePath
        Returns:
        the size in bytes

      • moveTo

        public void moveTo​(FilePath newName,
                   boolean atomicReplace)
        Description copied from class: FilePath
        Rename a file if this is allowed.
        Specified by:
        moveTo in class FilePath
        Parameters:
        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()
        Description copied from class: FilePath
        Create a new file.
        Specified by:
        createFile in class FilePath
        Returns:
        true if creating was successful

      • exists

        public boolean exists()
        Description copied from class: FilePath
        Checks if a file exists.
        Specified by:
        exists in class FilePath
        Returns:
        true if it exists

      • delete

        public void delete()
        Description copied from class: FilePath
        Delete a file or directory if it exists. Directories may only be deleted if they are empty.
        Specified by:
        delete in class FilePath

      • newDirectoryStream

        public java.util.List<FilePath> newDirectoryStream()
        Description copied from class: FilePath
        List the files and directories in the given directory.
        Specified by:
        newDirectoryStream in class FilePath
        Returns:
        the list of fully qualified file names

      • setReadOnly

        public boolean setReadOnly()
        Description copied from class: FilePath
        Disable the ability to write.
        Specified by:
        setReadOnly in class FilePath
        Returns:
        true if the call was successful

      • canWrite

        public boolean canWrite()
        Description copied from class: FilePath
        Check if the file is writable.
        Specified by:
        canWrite in class FilePath
        Returns:
        if the file is writable

      • getParent

        public FilePathMem getParent()
        Description copied from class: FilePath
        Get the parent directory of a file or directory.
        Specified by:
        getParent in class FilePath
        Returns:
        the parent directory name

      • isDirectory

        public boolean isDirectory()
        Description copied from class: FilePath
        Check if it is a file or a directory.
        Specified by:
        isDirectory in class FilePath
        Returns:
        true if it is a directory

      • isAbsolute

        public boolean isAbsolute()
        Description copied from class: FilePath
        Check if the file name includes a path.
        Specified by:
        isAbsolute in class FilePath
        Returns:
        if the file name is absolute

      • toRealPath

        public FilePathMem toRealPath()
        Description copied from class: FilePath
        Normalize a file name.
        Specified by:
        toRealPath in class FilePath
        Returns:
        the normalized file name

      • lastModified

        public long lastModified()
        Description copied from class: FilePath
        Get the last modified date of a file
        Specified by:
        lastModified in class FilePath
        Returns:
        the last modified date

      • createDirectory

        public void createDirectory()
        Description copied from class: FilePath
        Create a directory (all required parent directories already exist).
        Specified by:
        createDirectory in class FilePath

      • open

        public java.nio.channels.FileChannel open​(java.lang.String mode)
        Description copied from class: FilePath
        Open a random access file object.
        Specified by:
        open in class FilePath
        Parameters:
        mode - the access mode. Supported are r, rw, rws, rwd
        Returns:
        the file object

      • isRoot

        private boolean isRoot()

      • getCanonicalPath

        protected static java.lang.String getCanonicalPath​(java.lang.String fileName)
        Get the canonical path for this file name.
        Parameters:
        fileName - the file name
        Returns:
        the canonical path

      • getScheme

        public java.lang.String getScheme()
        Description copied from class: FilePath
        Get the scheme (prefix) for this file provider. This is similar to java.nio.file.spi.FileSystemProvider.getScheme.
        Specified by:
        getScheme in class FilePath
        Returns:
        the scheme

      • compressed

        boolean compressed()
        Whether the file should be compressed.
        Returns:
        if it should be compressed.