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package org.apache.tomcat.util.http.fileupload;

The ProgressListener may be used to display a progress bar or do stuff like that.
public interface ProgressListener {
Updates the listeners status information.

pBytesRead The total number of bytes, which have been read so far.
pContentLength The total number of bytes, which are being read. May be -1, if this number is unknown.
pItems The number of the field, which is currently being read. (0 = no item so far, 1 = first item is being read, ...)
    void update(long pBytesReadlong pContentLengthint pItems);
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