public static class AssetFileDescriptor.AutoCloseInputStream extends ParcelFileDescriptor.AutoCloseInputStream
ParcelFileDescritor.close()
for you when the stream is closed.Constructor and Description |
---|
AutoCloseInputStream(AssetFileDescriptor fd) |
Modifier and Type | Method and Description |
---|---|
int |
available()
Returns an estimate of the number of remaining bytes that can be read (or
skipped over) from this input stream without blocking by the next
invocation of a method for this input stream.
|
void |
mark(int readlimit)
Marks the current position in this input stream.
|
boolean |
markSupported()
Tests if this input stream supports the
mark and
reset methods. |
int |
read()
Reads a byte of data from this input stream.
|
int |
read(byte[] buffer)
Reads up to
b.length bytes of data from this input
stream into an array of bytes. |
int |
read(byte[] buffer,
int offset,
int count)
Reads up to
len bytes of data from this input stream
into an array of bytes. |
void |
reset()
Repositions this stream to the position at the time the
mark method was last called on this input stream. |
long |
skip(long count)
Skips over and discards
n bytes of data from the
input stream. |
close
finalize, getChannel, getFD
public AutoCloseInputStream(AssetFileDescriptor fd) throws IOException
IOException
public int available() throws IOException
FileInputStream
In some cases, a non-blocking read (or skip) may appear to be blocked when it is merely slow, for example when reading large files over slow networks.
available
in class FileInputStream
IOException
- if this file input stream has been closed by calling
close
or an I/O error occurs.public int read() throws IOException
FileInputStream
read
in class ParcelFileDescriptor.AutoCloseInputStream
-1
if the end of the
file is reached.IOException
- if an I/O error occurs.public int read(byte[] buffer, int offset, int count) throws IOException
FileInputStream
len
bytes of data from this input stream
into an array of bytes. If len
is not zero, the method
blocks until some input is available; otherwise, no
bytes are read and 0
is returned.read
in class ParcelFileDescriptor.AutoCloseInputStream
buffer
- the buffer into which the data is read.offset
- the start offset in the destination array b
count
- the maximum number of bytes read.-1
if there is no more data because the end of
the file has been reached.IOException
- if an I/O error occurs.InputStream.read()
public int read(byte[] buffer) throws IOException
FileInputStream
b.length
bytes of data from this input
stream into an array of bytes. This method blocks until some input
is available.read
in class ParcelFileDescriptor.AutoCloseInputStream
buffer
- the buffer into which the data is read.-1
if there is no more data because the end of
the file has been reached.IOException
- if an I/O error occurs.InputStream.read(byte[], int, int)
public long skip(long count) throws IOException
FileInputStream
n
bytes of data from the
input stream.
The skip
method may, for a variety of
reasons, end up skipping over some smaller number of bytes,
possibly 0
. If n
is negative, an
IOException
is thrown, even though the skip
method of the InputStream
superclass does nothing in this case.
The actual number of bytes skipped is returned.
This method may skip more bytes than are remaining in the backing file. This produces no exception and the number of bytes skipped may include some number of bytes that were beyond the EOF of the backing file. Attempting to read from the stream after skipping past the end will result in -1 indicating the end of the file.
skip
in class FileInputStream
count
- the number of bytes to be skipped.IOException
- if n is negative, if the stream does not
support seek, or if an I/O error occurs.public void mark(int readlimit)
InputStream
reset
method repositions this stream at the last marked
position so that subsequent reads re-read the same bytes.
The readlimit
arguments tells this input stream to
allow that many bytes to be read before the mark position gets
invalidated.
The general contract of mark
is that, if the method
markSupported
returns true
, the stream somehow
remembers all the bytes read after the call to mark
and
stands ready to supply those same bytes again if and whenever the method
reset
is called. However, the stream is not required to
remember any data at all if more than readlimit
bytes are
read from the stream before reset
is called.
Marking a closed stream should not have any effect on the stream.
The mark
method of InputStream
does
nothing.
mark
in class InputStream
readlimit
- the maximum limit of bytes that can be read before
the mark position becomes invalid.InputStream.reset()
public boolean markSupported()
InputStream
mark
and
reset
methods. Whether or not mark
and
reset
are supported is an invariant property of a
particular input stream instance. The markSupported
method
of InputStream
returns false
.markSupported
in class InputStream
true
if this stream instance supports the mark
and reset methods; false
otherwise.InputStream.mark(int)
,
InputStream.reset()
public void reset() throws IOException
InputStream
mark
method was last called on this input stream.
The general contract of reset
is:
markSupported
returns
true
, then:
mark
has not been called since
the stream was created, or the number of bytes read from the stream
since mark
was last called is larger than the argument
to mark
at that last call, then an
IOException
might be thrown.
IOException
is not thrown, then the
stream is reset to a state such that all the bytes read since the
most recent call to mark
(or since the start of the
file, if mark
has not been called) will be resupplied
to subsequent callers of the read
method, followed by
any bytes that otherwise would have been the next input data as of
the time of the call to reset
. markSupported
returns
false
, then:
reset
may throw an
IOException
.
IOException
is not thrown, then the stream
is reset to a fixed state that depends on the particular type of the
input stream and how it was created. The bytes that will be supplied
to subsequent callers of the read
method depend on the
particular type of the input stream. The method reset
for class InputStream
does nothing except throw an IOException
.
reset
in class InputStream
IOException
- if this stream has not been marked or if the
mark has been invalidated.InputStream.mark(int)
,
IOException