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8247918: Clarify Reader.skip behavior for end of stream

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Reviewed-by: rriggs, naoto
This commit is contained in:
Brian Burkhalter 2021-02-19 17:21:11 +00:00
parent 8a1c712c2e
commit 7ffa1481c2
8 changed files with 108 additions and 69 deletions
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28
src/java.base/share/classes/java/io/StringReader.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1996, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -105,31 +105,35 @@ public class StringReader extends Reader {
}
/**
* Skips the specified number of characters in the stream. Returns
* the number of characters that were skipped.
* Skips characters. If the stream is already at its end before this method
* is invoked, then no characters are skipped and zero is returned.
*
* <p>The {@code ns} parameter may be negative, even though the
* <p>The {@code n} parameter may be negative, even though the
* {@code skip} method of the {@link Reader} superclass throws
* an exception in this case. Negative values of {@code ns} cause the
* an exception in this case. Negative values of {@code n} cause the
* stream to skip backwards. Negative return values indicate a skip
* backwards. It is not possible to skip backwards past the beginning of
* the string.
*
* <p>If the entire string has been read or skipped, then this method has
* no effect and always returns 0.
* no effect and always returns {@code 0}.
*
* @throws IOException If an I/O error occurs
* @param n {@inheritDoc}
*
* @return {@inheritDoc}
*
* @throws IOException {@inheritDoc}
*/
public long skip(long ns) throws IOException {
public long skip(long n) throws IOException {
synchronized (lock) {
ensureOpen();
if (next >= length)
return 0;
// Bound skip by beginning and end of the source
long n = Math.min(length - next, ns);
n = Math.max(-next, n);
next += n;
return n;
long r = Math.min(length - next, n);
r = Math.max(-next, r);
next += r;
return r;
}
}