Package ej.bon

Class ResourceBuffer

java.lang.Object

ej.bon.ResourceBuffer

All Implemented Interfaces:

Closeable, AutoCloseable

public class ResourceBuffer
extends Object
implements Closeable

A resource buffer contains a set of data which is compacted to obtain a minimal footprint.

A data is a 8-bits word (signed or unsigned), a 16-bits word (signed or unsigned), a 32-bits (signed or unsigned), a float, a double, a String or a ResourceArray.

Constructor Summary

Constructors

Constructor	Description
ResourceBuffer(String name)	Opens a ResourceBuffer on the resource described by its path.

Method Summary

Modifier and Type	Method	Description
void	align(int nbBytes)	Force to align position on given number of bytes.
int	available()	Returns the available number of bytes that can be read (or skipped over) from this buffer.
void	close()	Closes this resource and releases any system resources associated with the resource.
ResourceArray	readArray()	Reads a ResourceArray and increments position in the data.
boolean	readBoolean()	Reads a boolean and increments position in the data.
byte	readByte()	Reads a byte and increments position in the data.
char	readChar()	Reads a char and increments position in the data.
int	readInt()	Reads an integer and increments position in the data.
short	readShort()	Reads a short and increments position in the data.
String	readString()	Reads a String and increments position in the data.
long	readVarLong()	Reads a 64-bits signed integer and increments position in the data.
int	readVarSInt()	Reads a 32-bits signed integer and increments position in the data.
int	readVarUInt()	Reads a 32-bits unsigned integer and increments position in the data.
void	seek(long offset)	Sets the buffer position indicator.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ResourceBuffer

public ResourceBuffer(String name)
               throws IOException

Opens a ResourceBuffer on the resource described by its path.

Parameters:

name - absolute resource name, as defined by Class.getResourceAsStream(String) (name must begin with character '/').

Throws:

IllegalArgumentException - when path does not denote an absolute path.

IOException - when the resource is not available in application classpath.

NullPointerException - if resource is null

Method Detail

close

public void close()
           throws IOException

Closes this resource and releases any system resources associated with the resource. All next read calls will cause an unknown behavior.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException - if an I/O error occurs.

readVarSInt

public int readVarSInt()
                throws IOException

Reads a 32-bits signed integer and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readVarUInt

public int readVarUInt()
                throws IOException

Reads a 32-bits unsigned integer and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readVarLong

public long readVarLong()
                 throws IOException

Reads a 64-bits signed integer and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readBoolean

public boolean readBoolean()
                    throws IOException

Reads a boolean and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readByte

public byte readByte()
              throws IOException

Reads a byte and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readShort

public short readShort()
                throws IOException

Reads a short and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readChar

public char readChar()
              throws IOException

Reads a char and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readInt

public int readInt()
            throws IOException

Reads an integer and increments position in the data.

Returns:

the value read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readString

public String readString()
                  throws IOException

Reads a String and increments position in the data.

Returns:

the String read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

readArray

public ResourceArray readArray()
                        throws IOException

Reads a ResourceArray and increments position in the data.

Returns:

the ResourceArray read.

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

seek

public void seek(long offset)
          throws IOException

Sets the buffer position indicator. The new position, measured in bytes, is obtained by adding offset bytes to the start of the buffer.

Parameters:

offset - the offset from start of buffer.

Throws:

IndexOutOfBoundsException - if there is no position with the given offset.

EOFException - when end of file is reached.

IOException - if an I/O error occurs.

available

public int available()
              throws IOException

Returns the available number of bytes that can be read (or skipped over) from this buffer.

Returns:

the number of bytes that can be read

Throws:

IOException - if an I/O error occurs.

align

public void align(int nbBytes)
           throws IOException

Force to align position on given number of bytes. A value lower than 2 is ignored.

Parameters:

nbBytes - number of bytes to align

Throws:

EOFException - when end of file is reached.

IOException - if an I/O error occurs.