Module java.desktop

Class FileImageInputStream

java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
javax.imageio.stream.FileImageInputStream
All Implemented Interfaces:
Closeable, DataInput, AutoCloseable, ImageInputStream

public class FileImageInputStream
extends ImageInputStreamImpl
An implementation of ImageInputStream that gets its input from a File or RandomAccessFile. The file contents are assumed to be stable during the lifetime of the object.
  • Constructor Details

    • FileImageInputStream

      public FileImageInputStream​(File f) throws FileNotFoundException, IOException
      Constructs a FileImageInputStream that will read from a given File.

      The file contents must not change between the time this object is constructed and the time of the last call to a read method.

      Parameters:
      f - a File to read from.
      Throws:
      IllegalArgumentException - if f is null.
      SecurityException - if a security manager exists and does not allow read access to the file.
      FileNotFoundException - if f is a directory or cannot be opened for reading for any other reason.
      IOException - if an I/O error occurs.
    • FileImageInputStream

      public FileImageInputStream​(RandomAccessFile raf)
      Constructs a FileImageInputStream that will read from a given RandomAccessFile.

      The file contents must not change between the time this object is constructed and the time of the last call to a read method.

      Parameters:
      raf - a RandomAccessFile to read from.
      Throws:
      IllegalArgumentException - if raf is null.
  • Method Details

    • length

      public long length()
      Returns the length of the underlying file, or -1 if it is unknown.
      Specified by:
      length in interface ImageInputStream
      Overrides:
      length in class ImageInputStreamImpl
      Returns:
      the file length as a long, or -1.
    • finalize

      @Deprecated(since="9") protected void finalize() throws Throwable
      Deprecated.
      The finalize method has been deprecated. Subclasses that override finalize in order to perform cleanup should be modified to use alternative cleanup mechanisms and to remove the overriding finalize method. When overriding the finalize method, its implementation must explicitly ensure that super.finalize() is invoked as described in Object.finalize(). See the specification for Object.finalize() for further information about migration options.
      Finalizes this object prior to garbage collection. The close method is called to close any open input source. This method should not be called from application code.
      Overrides:
      finalize in class ImageInputStreamImpl
      Throws:
      Throwable - if an error occurs during superclass finalization.
      See Also:
      WeakReference, PhantomReference