net.sf.saxon.om

Class PrefixPool

java.lang.Object

net.sf.saxon.om.PrefixPool

public class PrefixPool
extends java.lang.Object

A prefix pool maintains a two-way mapping from namespace prefixes (as strings) to integer prefix codes. Prefix codes always fit in 10 bits, but are handled as ints. Until 9.8, prefixes were managed by the NamePool. The NamePool now only handles fingerprints, which are integer representations of the URI and local name parts of a QName. Prefix codes are now used only in the tinytree, and the table of codes is local to a document. For this reason, access is not synchronised.

Constructor Summary

Constructors

Constructor and Description
PrefixPool()

Method Summary

Modifier and Type	Method and Description
void	condense() Eliminate unused space, on the assumption that no further prefixes will be added to the pool, and that subsequent access will be to get the prefix for a code, and not vice versa.
java.lang.String	getPrefix(int code) Get the prefix corresponding to a given code
int	obtainPrefixCode(java.lang.String prefix) Get the prefix code corresponding to a given prefix, allocating a new code if necessary

Methods inherited from class java.lang.Object

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

Constructor Detail

PrefixPool

public PrefixPool()

Method Detail

obtainPrefixCode

public int obtainPrefixCode(java.lang.String prefix)

Get the prefix code corresponding to a given prefix, allocating a new code if necessary

Parameters:

prefix - the namespace prefix. If empty, the prefix code is always zero.

Returns:

the integer prefix code (always fits in 10 bits)

getPrefix

public java.lang.String getPrefix(int code)

Get the prefix corresponding to a given code

Parameters:

code - the prefix code (which must have been allocated)

Returns:

the corresponding prefix

Throws:

java.lang.IllegalArgumentException - if the code has not been allocated

condense

public void condense()

Eliminate unused space, on the assumption that no further prefixes will be added to the pool, and that subsequent access will be to get the prefix for a code, and not vice versa.