Class TemporaryFileDataSource


  • public class TemporaryFileDataSource
    extends FileDataSource
    A DataSource which stores its data in a temporary file. This can be used to represent data which is only available to read once from an intput stream. The stream is read when this source is constructed, and cached in a temporary file. The temporary file is removed when this object is finalized or when the VM is terminated normally.
    Author:
    Mark Taylor (Starlink), Peter W. Draper (Starlink)
    • Constructor Detail

      • TemporaryFileDataSource

        public TemporaryFileDataSource​(java.io.InputStream baseStream,
                                       java.lang.String name)
                                throws java.io.IOException
        Constructs a new DataSource by reading the contents of an input stream. The name of the source is also supplied; it does not take the name (or URL) of the file, since that does not represent a persistent object.
        Parameters:
        baseStream - the stream which supplies this source's data
        name - the name of the source
        Throws:
        java.io.IOException
      • TemporaryFileDataSource

        public TemporaryFileDataSource​(java.io.InputStream baseStream,
                                       java.lang.String name,
                                       java.lang.String prefix,
                                       java.lang.String suffix,
                                       java.io.File directory)
                                throws java.io.IOException
        Constructs a new DataSource by reading the contents of an input stream. The name of the source is also supplied; it does not take the name (or URL) of the file, since that does not represent a persistent object. Using this constructor you may also supply the prefix, suffix and directory used for the temporary file see File.createTempFile(String,String,File).
        Parameters:
        baseStream - the stream which supplies this source's data
        name - the name of the source
        prefix - the prefix string to be used in generating the file's name; must be at least three characters long
        suffix - the suffix string to be used in generating the file's name; may be null, in which case the suffix ".tmp" will be used
        directory - the directory in which the file is to be created, or null if the default temporary-file directory is to be used
        Throws:
        java.io.IOException
    • Method Detail

      • getURL

        public java.net.URL getURL()
        Returns null, since the data is not represented by a persistent object.
        Overrides:
        getURL in class FileDataSource
        Returns:
        a URL corresponding to this source, or null
      • finalize

        public void finalize()
        Deletes the temporary data file.
        Overrides:
        finalize in class java.lang.Object