Package org.apache.derby.impl.io.vfmem

Class DataStoreEntry

  • public class DataStoreEntry
extends java.lang.Object
    A data store entry representing either a file or a directory.

    If the entry is a directory, it doesn't create a data object.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private boolean isDir
      Tells if this entry is a directory or a regular file.
      private boolean isReadOnly
      Tells if this entry is read-only or not.
      private java.lang.String path
      The path of this entry.
      private boolean released
      Tells if the entry has been released or not.
      private BlockedByteArray src
      The data of the entry.

    • Constructor Summary

      Constructors 
      Constructor Description
      DataStoreEntry​(java.lang.String path, boolean isDir)
      Creates a new data store entry.

    • Field Detail

      • path

        private final java.lang.String path
        The path of this entry.

      • isDir

        private final boolean isDir
        Tells if this entry is a directory or a regular file.

      • isReadOnly

        private boolean isReadOnly
        Tells if this entry is read-only or not.

      • released

        private volatile boolean released
        Tells if the entry has been released or not.

    • Constructor Detail

      • DataStoreEntry

        public DataStoreEntry​(java.lang.String path,
                      boolean isDir)
        Creates a new data store entry.
        Parameters:
        path - the path of the entry
        isDir - whether the entry is a directory or a regular file

    • Method Detail

      • isDirectory

        public boolean isDirectory()
        Tells if this entry is a directory.
        Returns:
        true if directory, false otherwise.

      • getInputStream

        BlockedByteArrayInputStream getInputStream()
                                    throws java.io.FileNotFoundException
        Returns an input stream to read from this entry.
        Returns:
        An InputStream-object.
        Throws:
        java.io.FileNotFoundException - if this entry is a directory

      • getOutputStream

        BlockedByteArrayOutputStream getOutputStream​(boolean append)
                                      throws java.io.FileNotFoundException
        Returns an output stream to write into this entry.
        Parameters:
        append - tells whether the entry should be appended or not
        Returns:
        An OutputStream-object.
        Throws:
        java.io.FileNotFoundException - if this entry is a directory, or is read-only

      • length

        public long length()
        Returns the length of this entry.
        Returns:
        The length in bytes.

      • setReadOnly

        public void setReadOnly()
        Makes this entry read-only.

      • isReadOnly

        public boolean isReadOnly()
        Tells if this entry is read-only.
        Returns:
        true is read-only, false if not.

      • release

        void release()
        Relases this entry.

      • setLength

        public void setLength​(long newLength)
        Sets the length of this entry.
        Parameters:
        newLength - the length in number of bytes

      • checkIfReleased

        private void checkIfReleased()
        Checks if this entry has been released.
        Throws:
        java.lang.IllegalStateException - if the entry has been released