public final class AssetManager.AssetInputStream extends InputStream
Modifier and Type | Method and Description |
---|---|
int |
available()
Returns an estimate of the number of 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 |
close()
Closes this input stream and releases any system resources associated
with the stream.
|
protected void |
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
int |
getAssetInt() |
long |
getNativeAsset() |
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 the next byte of data from the input stream.
|
int |
read(byte[] b)
Reads some number of bytes from the input stream and stores them into
the buffer array
b . |
int |
read(byte[] b,
int off,
int len)
Reads up to
len bytes of data from the 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 n)
Skips over and discards
n bytes of data from this input
stream. |
public final int getAssetInt()
public final long getNativeAsset()
public final int read() throws IOException
InputStream
int
in the range 0
to
255
. If no byte is available because the end of the stream
has been reached, the value -1
is returned. This method
blocks until input data is available, the end of the stream is detected,
or an exception is thrown.
A subclass must provide an implementation of this method.
read
in class InputStream
-1
if the end of the
stream is reached.IOException
- if an I/O error occurs.public final 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 final int available() throws IOException
InputStream
Note that while some implementations of InputStream
will return
the total number of bytes in the stream, many will not. It is
never correct to use the return value of this method to allocate
a buffer intended to hold all data in this stream.
A subclass' implementation of this method may choose to throw an
IOException
if this input stream has been closed by
invoking the InputStream.close()
method.
The available
method for class InputStream
always
returns 0
.
This method should be overridden by subclasses.
available
in class InputStream
0
when
it reaches the end of the input stream.IOException
- if an I/O error occurs.public final void close() throws IOException
InputStream
The close
method of InputStream
does
nothing.
close
in interface Closeable
close
in interface AutoCloseable
close
in class InputStream
IOException
- if an I/O error occurs.public final 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 final 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
public final int read(byte[] b) throws IOException
InputStream
b
. The number of bytes actually read is
returned as an integer. This method blocks until input data is
available, end of file is detected, or an exception is thrown.
If the length of b
is zero, then no bytes are read and
0
is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at the
end of the file, the value -1
is returned; otherwise, at
least one byte is read and stored into b
.
The first byte read is stored into element b[0]
, the
next one into b[1]
, and so on. The number of bytes read is,
at most, equal to the length of b
. Let k be the
number of bytes actually read; these bytes will be stored in elements
b[0]
through b[
k-1]
,
leaving elements b[
k]
through
b[b.length-1]
unaffected.
The read(b)
method for class InputStream
has the same effect as:
read(b, 0, b.length)
read
in class InputStream
b
- the buffer into which the data is read.-1
if there is no more data because the end of
the stream has been reached.IOException
- If the first byte cannot be read for any reason
other than the end of the file, if the input stream has been closed, or
if some other I/O error occurs.InputStream.read(byte[], int, int)
public final int read(byte[] b, int off, int len) throws IOException
InputStream
len
bytes of data from the input stream into
an array of bytes. An attempt is made to read as many as
len
bytes, but a smaller number may be read.
The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
If len
is zero, then no bytes are read and
0
is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at end of
file, the value -1
is returned; otherwise, at least one
byte is read and stored into b
.
The first byte read is stored into element b[off]
, the
next one into b[off+1]
, and so on. The number of bytes read
is, at most, equal to len
. Let k be the number of
bytes actually read; these bytes will be stored in elements
b[off]
through b[off+
k-1]
,
leaving elements b[off+
k]
through
b[off+len-1]
unaffected.
In every case, elements b[0]
through
b[off]
and elements b[off+len]
through
b[b.length-1]
are unaffected.
The read(b,
off,
len)
method
for class InputStream
simply calls the method
read()
repeatedly. If the first such call results in an
IOException
, that exception is returned from the call to
the read(b,
off,
len)
method. If
any subsequent call to read()
results in a
IOException
, the exception is caught and treated as if it
were end of file; the bytes read up to that point are stored into
b
and the number of bytes read before the exception
occurred is returned. The default implementation of this method blocks
until the requested amount of input data len
has been read,
end of file is detected, or an exception is thrown. Subclasses are encouraged
to provide a more efficient implementation of this method.
read
in class InputStream
b
- the buffer into which the data is read.off
- the start offset in array b
at which the data is written.len
- the maximum number of bytes to read.-1
if there is no more data because the end of
the stream has been reached.IOException
- If the first byte cannot be read for any reason
other than end of file, or if the input stream has been closed, or if
some other I/O error occurs.InputStream.read()
public final long skip(long n) throws IOException
InputStream
n
bytes of data from this input
stream. The skip
method may, for a variety of reasons, end
up skipping over some smaller number of bytes, possibly 0
.
This may result from any of a number of conditions; reaching end of file
before n
bytes have been skipped is only one possibility.
The actual number of bytes skipped is returned. If n
is
negative, no bytes are skipped.
The skip
method of this class creates a
byte array and then repeatedly reads into it until n
bytes
have been read or the end of the stream has been reached. Subclasses are
encouraged to provide a more efficient implementation of this method.
For instance, the implementation may depend on the ability to seek.
skip
in class InputStream
n
- the number of bytes to be skipped.IOException
- if the stream does not support seek,
or if some other I/O error occurs.protected void finalize() throws Throwable
Object
finalize
method to dispose of
system resources or to perform other cleanup.
The general contract of finalize
is that it is invoked
if and when the JavaTM virtual
machine has determined that there is no longer any
means by which this object can be accessed by any thread that has
not yet died, except as a result of an action taken by the
finalization of some other object or class which is ready to be
finalized. The finalize
method may take any action, including
making this object available again to other threads; the usual purpose
of finalize
, however, is to perform cleanup actions before
the object is irrevocably discarded. For example, the finalize method
for an object that represents an input/output connection might perform
explicit I/O transactions to break the connection before the object is
permanently discarded.
The finalize
method of class Object
performs no
special action; it simply returns normally. Subclasses of
Object
may override this definition.
The Java programming language does not guarantee which thread will
invoke the finalize
method for any given object. It is
guaranteed, however, that the thread that invokes finalize will not
be holding any user-visible synchronization locks when finalize is
invoked. If an uncaught exception is thrown by the finalize method,
the exception is ignored and finalization of that object terminates.
After the finalize
method has been invoked for an object, no
further action is taken until the Java virtual machine has again
determined that there is no longer any means by which this object can
be accessed by any thread that has not yet died, including possible
actions by other objects or classes which are ready to be finalized,
at which point the object may be discarded.
The finalize
method is never invoked more than once by a Java
virtual machine for any given object.
Any exception thrown by the finalize
method causes
the finalization of this object to be halted, but is otherwise
ignored.