package be.nikiroo.utils; import java.io.FileInputStream; import java.io.FilterInputStream; import java.io.IOException; import java.nio.channels.FileChannel; /** * This is a markable (and thus reset-able) stream that you can create from a * FileInputStream. * * @author niki */ public class MarkableFileInputStream extends FilterInputStream { private FileChannel channel; private long mark = 0; /** * Create a new {@link MarkableFileInputStream} from this stream. * * @param in * the original {@link FileInputStream} to wrap */ public MarkableFileInputStream(FileInputStream in) { super(in); channel = in.getChannel(); } @Override public boolean markSupported() { return true; } @Override public synchronized void mark(int readlimit) { try { mark = channel.position(); } catch (IOException ex) { ex.printStackTrace(); mark = -1; } } @Override public synchronized void reset() throws IOException { if (mark < 0) { throw new IOException("mark position not valid"); } channel.position(mark); } }