java.lang.Object | ||
↳ | java.io.InputStream | |
↳ | java.io.StringBufferInputStream |
This class is deprecated.
Use StringReader
A specialized InputStream
that reads bytes from a String
in
a sequential manner.
Fields | |||||||||||
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buffer | The source string containing the data to read. | ||||||||||
count | The total number of characters in the source string. | ||||||||||
pos | The current position within the source string. |
Public Constructors | |||||||||||
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Construct a new
StringBufferInputStream with str as
source. |
Public Methods | |||||||||||
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Returns an estimated number of bytes that can be read or skipped without blocking for more
input.
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Reads at most
length bytes from the source string and stores them
in the byte array b starting at offset . | |||||||||||
Reads a single byte from the source string and returns it as an integer
in the range from 0 to 255.
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Resets this stream to the beginning of the source string.
| |||||||||||
Skips
n characters in the source string. |
[Expand]
Inherited Methods | |||||||||||
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From class java.io.InputStream
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From class java.lang.Object
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From interface java.io.Closeable
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Construct a new StringBufferInputStream
with str
as
source. The size of the stream is set to the length()
of the
string.
str | the source string for this stream. |
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NullPointerException | if str is null .
|
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Returns an estimated number of bytes that can be read or skipped without blocking for more input.
Note that this method provides such a weak guarantee that it is not very useful in practice.
Firstly, the guarantee is "without blocking for more input" rather than "without blocking": a read may still block waiting for I/O to complete — the guarantee is merely that it won't have to wait indefinitely for data to be written. The result of this method should not be used as a license to do I/O on a thread that shouldn't be blocked.
Secondly, the result is a conservative estimate and may be significantly smaller than the actual number of bytes available. In particular, an implementation that always returns 0 would be correct. In general, callers should only use this method if they'd be satisfied with treating the result as a boolean yes or no answer to the question "is there definitely data ready?".
Thirdly, the fact that a given number of bytes is "available" does not guarantee that a read or skip will actually read or skip that many bytes: they may read or skip fewer.
It is particularly important to realize that you must not use this method to
size a container and assume that you can read the entirety of the stream without needing
to resize the container. Such callers should probably write everything they read to a
ByteArrayOutputStream
and convert that to a byte array. Alternatively, if you're
reading from a file, length()
returns the current length of the file (though
assuming the file's length can't change may be incorrect, reading a file is inherently
racy).
The default implementation of this method in InputStream
always returns 0.
Subclasses should override this method if they are able to indicate the number of bytes
available.
Reads at most length
bytes from the source string and stores them
in the byte array b
starting at offset
.
b | the byte array in which to store the bytes read. |
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offset | the initial position in b to store the bytes read from
this stream. |
length | the maximum number of bytes to store in b . |
IndexOutOfBoundsException | if offset < 0 or length < 0 , or if
offset + length is greater than the length of
b . |
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NullPointerException | if b is null .
|
Reads a single byte from the source string and returns it as an integer in the range from 0 to 255. Returns -1 if the end of the source string has been reached.
Resets this stream to the beginning of the source string.
Skips n
characters in the source string. It does nothing and
returns 0 if n
is negative. Less than n
characters are
skipped if the end of the source string is reached before the operation
completes.
n | the number of characters to skip. |
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