public FileCacheImageInputStream(InputStream stream, File cacheDir) throws IOException

Constructs a FileCacheImageInputStream that will read from a given InputStream.

A temporary file is used as a cache. If cacheDir is non-null and is a directory, the file will be created there. If it is null, the system-dependent default temporary-file directory will be used (see the documentation for File.createTempFile for details).

public int read() throws IOException

Reads a single byte from the stream and returns it as an int between 0 and 255. If EOF is reached, -1 is returned.

Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.

The bit offset within the stream must be reset to zero before the read occurs.

public int read(byte[] b, int off, int len) throws IOException

Reads up to len bytes from the stream, and stores them into b starting at index off. If no bytes can be read because the end of the stream has been reached, -1 is returned.

The bit offset within the stream must be reset to zero before the read occurs.

Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.

public boolean isCached()

Returns true since this ImageInputStream caches data in order to allow seeking backwards.

public boolean isCachedFile()

Returns true since this ImageInputStream maintains a file cache.

public boolean isCachedMemory()

Returns false since this ImageInputStream does not maintain a main memory cache.

public void close() throws IOException

Closes this FileCacheImageInputStream, closing and removing the cache file. The source InputStream is not closed.

@Deprecated(since="9", forRemoval=true) protected void finalize() throws Throwable

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.