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java.lang.Objectde.intarsys.tools.randomaccess.AbstractRandomAccess
de.intarsys.tools.randomaccess.RandomAccessFilter
de.intarsys.tools.randomaccess.RandomAccessViewport
public class RandomAccessViewport
A viewport in an existing IRandomAccess
.
Field Summary |
---|
Fields inherited from class de.intarsys.tools.randomaccess.RandomAccessFilter |
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random |
Constructor Summary | |
---|---|
RandomAccessViewport(IRandomAccess ra,
long offset,
long length)
Create a viewport to the existing IRandomAccess ra . |
Method Summary | |
---|---|
long |
getLength()
Returns the length of this data container. |
long |
getOffset()
Returns the current offset in this data container. |
protected long |
getViewEnd()
|
protected long |
getViewLength()
|
protected long |
getViewOffset()
|
boolean |
isReadOnly()
true if this is a read only data container. |
int |
read()
Reads a byte of data from this data container. |
int |
read(byte[] buffer)
Reads up to buffer.length bytes of data from this data
container into an array of bytes. |
int |
read(byte[] buffer,
int start,
int numBytes)
Reads up to len bytes of data from this data container into
an array of bytes. |
void |
seek(long offset)
Sets the offset, measured from the beginning of the data container at which the next read or write occurs. |
void |
seekBy(long delta)
Sets the offset, measured from the current offset at which the next read or write occurs. |
void |
setLength(long newLength)
Assign the length. |
void |
write(byte[] buffer)
Writes b.length bytes from the specified byte array,
starting at the current offset. |
void |
write(byte[] buffer,
int start,
int numBytes)
Writes len bytes from the specified byte array starting at
start . |
void |
write(int b)
Writes the specified byte . |
Methods inherited from class de.intarsys.tools.randomaccess.RandomAccessFilter |
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close, flush, getRandom |
Methods inherited from class de.intarsys.tools.randomaccess.AbstractRandomAccess |
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asInputStream, asOutputStream, getPositionStack, mark, reset |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public RandomAccessViewport(IRandomAccess ra, long offset, long length) throws java.io.IOException
IRandomAccess
ra
.
ATTENTION: This will not seek to offset
in ra
.
This means after creation before initial use you have to position the
IRandomAccess
yourself using seek
.
ra
- offset
- length
-
java.io.IOException
Method Detail |
---|
public long getLength() throws java.io.IOException
IRandomAccess
getLength
in interface IRandomAccess
getLength
in class RandomAccessFilter
java.io.IOException
- if an I/O error occurs.public long getOffset() throws java.io.IOException
IRandomAccess
getOffset
in interface IRandomAccess
getOffset
in class RandomAccessFilter
java.io.IOException
- if an I/O error occurs.protected long getViewEnd()
protected long getViewLength()
protected long getViewOffset()
public boolean isReadOnly()
IRandomAccess
true
if this is a read only data container.
isReadOnly
in interface IRandomAccess
isReadOnly
in class RandomAccessFilter
true
if this is a read only data container.public int read() throws java.io.IOException
IRandomAccess
0x00-0x0ff
). This method
blocks if no input is yet available.
This method behaves in exactly the same way as the
InputStream.read()
method of InputStream
.
read
in interface IRandomAccess
read
in class RandomAccessFilter
-1
if the end of the data
container has been reached.
java.io.IOException
- if an I/O error occurs. Not thrown if the end of the data
container has been reached.public int read(byte[] buffer) throws java.io.IOException
IRandomAccess
buffer.length
bytes of data from this data
container into an array of bytes. This method blocks until at least one
byte of input is available.
This method behaves in the exactly the same way as the
InputStream.read(byte[])
method of InputStream
.
read
in interface IRandomAccess
read
in class RandomAccessFilter
buffer
- the buffer into which the data is read.
-1
if there is no more data because the end of this
data container has been reached.
java.io.IOException
- if an I/O error occurs.public int read(byte[] buffer, int start, int numBytes) throws java.io.IOException
IRandomAccess
len
bytes of data from this data container into
an array of bytes. This method blocks until at least one byte of input is
available.
read
in interface IRandomAccess
read
in class RandomAccessFilter
buffer
- the buffer into which the data is read.start
- the start offset of the data.numBytes
- the maximum number of bytes read.
-1
if there is no more data because the end of the
file has been reached.
java.io.IOException
- if an I/O error occurs.public void seek(long offset) throws java.io.IOException
IRandomAccess
seek
in interface IRandomAccess
seek
in class RandomAccessFilter
offset
- the offset position, measured in bytes from the beginning of
the data container
java.io.IOException
- if offset
is less than 0
or if
an I/O error occurs.public void seekBy(long delta) throws java.io.IOException
IRandomAccess
seekBy
in interface IRandomAccess
seekBy
in class RandomAccessFilter
delta
- the amount of bytes by which to change the current offset
position
java.io.IOException
- if the resulting offset
is less than
0
or if an I/O error occurs.public void setLength(long newLength) throws java.io.IOException
IRandomAccess
setLength
in interface IRandomAccess
setLength
in class RandomAccessFilter
java.io.IOException
public void write(byte[] buffer) throws java.io.IOException
IRandomAccess
b.length
bytes from the specified byte array,
starting at the current offset.
write
in interface IRandomAccess
write
in class RandomAccessFilter
buffer
- the data.
java.io.IOException
- if an I/O error occurs.public void write(byte[] buffer, int start, int numBytes) throws java.io.IOException
IRandomAccess
len
bytes from the specified byte array starting at
start
.
write
in interface IRandomAccess
write
in class RandomAccessFilter
buffer
- the data.start
- the start offset in the data.numBytes
- the number of bytes to write.
java.io.IOException
- if an I/O error occurs.public void write(int b) throws java.io.IOException
IRandomAccess
write
in interface IRandomAccess
write
in class RandomAccessFilter
b
- the byte
to be written.
java.io.IOException
- if an I/O error occurs.
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