Package de.intarsys.tools.randomaccess
Class RandomAccessByteArray
- java.lang.Object
-
- de.intarsys.tools.randomaccess.AbstractRandomAccess
-
- de.intarsys.tools.randomaccess.RandomAccessByteArray
-
- All Implemented Interfaces:
IRandomAccess
public class RandomAccessByteArray extends AbstractRandomAccess
A wrapper around a byte array to allow random access like API.
-
-
Constructor Summary
Constructors Constructor Description RandomAccessByteArray(byte[] buffer)
RandomAccessByteArray(byte[] buffer, int length)
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
basicSetLengthResize(int newLength)
void
close()
Closes this random access data container and releases any system resources associated with the stream.void
flush()
Force changes to be made persistent.protected byte[]
getData()
long
getLength()
Returns the length of this data container.long
getOffset()
Returns the current offset in this data container.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 tobuffer.length
bytes of data from this data container into an array of bytes.int
read(byte[] buffer, int bufferOffset, int numBytes)
Reads up tolen
bytes of data from this data container into an array of bytes.void
seek(long pOffset)
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.byte[]
toByteArray()
void
write(byte[] buffer)
Writesb.length
bytes from the specified byte array, starting at the current offset.void
write(byte[] buffer, int start, int numBytes)
Writeslen
bytes from the specified byte array starting atstart
.void
write(int b)
Writes the specified byte .-
Methods inherited from class de.intarsys.tools.randomaccess.AbstractRandomAccess
asInputStream, asOutputStream, getPositionStack, mark, reset
-
-
-
-
Method Detail
-
basicSetLengthResize
protected final void basicSetLengthResize(int newLength)
-
close
public void close() throws java.io.IOException
Description copied from interface:IRandomAccess
Closes this random access data container and releases any system resources associated with the stream. A closed random access data container cannot perform input or output operations and cannot be reopened.- Throws:
java.io.IOException
- if an I/O error occurs.
-
flush
public void flush() throws java.io.IOException
Description copied from interface:IRandomAccess
Force changes to be made persistent.- Throws:
java.io.IOException
-
getData
protected byte[] getData()
- Returns:
- Returns the data.
-
getLength
public long getLength() throws java.io.IOException
Description copied from interface:IRandomAccess
Returns the length of this data container.- Returns:
- the length of this data container, measured in bytes.
- Throws:
java.io.IOException
- if an I/O error occurs.
-
getOffset
public long getOffset()
Description copied from interface:IRandomAccess
Returns the current offset in this data container.- Returns:
- the offset from the beginning of the data container, in bytes, at which the next read or write occurs.
-
isReadOnly
public boolean isReadOnly()
Description copied from interface:IRandomAccess
true
if this is a read only data container.- Returns:
true
if this is a read only data container.
-
read
public int read()
Description copied from interface:IRandomAccess
Reads a byte of data from this data container. The byte is returned as an integer in the range 0 to 255 (0x00-0x0ff
). This method blocks if no input is yet available.This method behaves in exactly the same way as the
InputStream.read()
method ofInputStream
.- Returns:
- the next byte of data, or
-1
if the end of the data container has been reached.
-
read
public int read(byte[] buffer)
Description copied from interface:IRandomAccess
Reads up tobuffer.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 ofInputStream
.- Parameters:
buffer
- the buffer into which the data is read.- Returns:
- the total number of bytes read into the buffer, or
-1
if there is no more data because the end of this data container has been reached.
-
read
public int read(byte[] buffer, int bufferOffset, int numBytes)
Description copied from interface:IRandomAccess
Reads up tolen
bytes of data from this data container into an array of bytes. This method blocks until at least one byte of input is available.- Parameters:
buffer
- the buffer into which the data is read.bufferOffset
- the start offset of the data.numBytes
- the maximum number of bytes read.- Returns:
- the total number of bytes read into the buffer, or
-1
if there is no more data because the end of the file has been reached.
-
seek
public void seek(long pOffset) throws java.io.IOException
Description copied from interface:IRandomAccess
Sets the offset, measured from the beginning of the data container at which the next read or write occurs. The offset may be set beyond the end of the data container. Setting the offset beyond the end of the data container does not change the data container length. The length will change only by writing after the offset has been set beyond the end of the data container.- Parameters:
pOffset
- the offset position, measured in bytes from the beginning of the data container- Throws:
java.io.IOException
- ifoffset
is less than0
or if an I/O error occurs.
-
seekBy
public void seekBy(long delta) throws java.io.IOException
Description copied from interface:IRandomAccess
Sets the offset, measured from the current offset at which the next read or write occurs. The offset may be set beyond the end of the data container. Setting the offset beyond the end of the data container does not change the data container length. The length will change only by writing after the offset has been set beyond the end of the data container.- Parameters:
delta
- the amount of bytes by which to change the current offset position- Throws:
java.io.IOException
- if the resultingoffset
is less than0
or if an I/O error occurs.
-
setLength
public void setLength(long newLength)
Description copied from interface:IRandomAccess
Assign the length. All bytes after length are truncated. If the real length is currently less than newLength, the data structure will be enlarged.
-
toByteArray
public byte[] toByteArray()
-
write
public void write(byte[] buffer)
Description copied from interface:IRandomAccess
Writesb.length
bytes from the specified byte array, starting at the current offset.- Parameters:
buffer
- the data.
-
write
public void write(byte[] buffer, int start, int numBytes)
Description copied from interface:IRandomAccess
Writeslen
bytes from the specified byte array starting atstart
.- Parameters:
buffer
- the data.start
- the start offset in the data.numBytes
- the number of bytes to write.
-
write
public void write(int b)
Description copied from interface:IRandomAccess
Writes the specified byte . The write starts at the current offset.- Parameters:
b
- thebyte
to be written.
-
-