Package net.sf.saxon.om

Class PrefixPool

java.lang.Object
net.sf.saxon.om.PrefixPool
public class PrefixPool extends Object
A prefix pool maintains a two-way mapping from namespace prefixes (as strings) to integer prefix codes. Prefix codes always fit in 11 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
    Description
    PrefixPool()
     

  • Method Summary

    Modifier and Type
    Method
    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.
    String
    getPrefix(int code)
    Get the prefix corresponding to a given code
    int
    obtainPrefixCode(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 Details

    • PrefixPool

      public PrefixPool()

  • Method Details

    • obtainPrefixCode

      public int obtainPrefixCode(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 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:
      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.