ContentLengthInputStream

Class Overview

Stream that cuts off after a specified number of bytes. Note that this class NEVER closes the underlying stream, even when close gets called. Instead, it will read until the "end" of its chunking on close, which allows for the seamless execution of subsequent HTTP 1.1 requests, while not requiring the client to remember to read the entire contents of the response.

Implementation note: Choices abound. One approach would pass through the mark(int) and reset() calls to the underlying stream. That's tricky, though, because you then have to start duplicating the work of keeping track of how much a reset rewinds. Further, you have to watch out for the "readLimit", and since the semantics for the readLimit leave room for differing implementations, you might get into a lot of trouble.

Alternatively, you could make this class extend BufferedInputStream and then use the protected members of that class to avoid duplicated effort. That solution has the side effect of adding yet another possible layer of buffering.

Then, there is the simple choice, which this takes - simply don't support mark(int) and reset() . That choice has the added benefit of keeping this class very simple.

Summary

[Expand] Inherited Methods
From class java.io.InputStream int available () Returns an estimated number of bytes that can be read or skipped without blocking for more input. void close () Closes this stream. void mark (int readlimit) Sets a mark position in this InputStream. boolean markSupported () Indicates whether this stream supports the mark() and reset() methods. int read (byte[] buffer) Equivalent to read(buffer, 0, buffer.length) . abstract int read () Reads a single byte from this stream and returns it as an integer in the range from 0 to 255. int read (byte[] buffer, int byteOffset, int byteCount) Reads up to byteCount bytes from this stream and stores them in the byte array buffer starting at byteOffset . synchronized void reset () Resets this stream to the last marked location. long skip (long byteCount) Skips at most byteCount bytes in this stream.
From class java.lang.Object Object clone () Creates and returns a copy of this Object . boolean equals ( Object o) Compares this instance with the specified object and indicates if they are equal. void finalize () Invoked when the garbage collector has detected that this instance is no longer reachable. final Class <?> getClass () Returns the unique instance of Class that represents this object's class. int hashCode () Returns an integer hash code for this object. final void notify () Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up. final void notifyAll () Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up. String toString () Returns a string containing a concise, human-readable description of this object. final void wait () Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object. final void wait (long millis, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires. final void wait (long millis) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
From interface java.io.Closeable abstract void close () Closes the object and release any system resources it holds.
From interface java.lang.AutoCloseable abstract void close () Closes the object and release any system resources it holds.