## net.sf.saxon.pattern
Class PatternMaker

    java.lang.Object
      net.sf.saxon.pattern.PatternMaker

    public class PatternMaker

extends Object

This is a singleton class used to convert an expression to an equivalent pattern. This version of the class is used to generate conventional XSLT match patterns; there is another version used to generate patterns suitable for streamed evaluation in Saxon-EE.

Constructor Summary
`PatternMaker()`

Method Summary
`static Pattern` `fromExpression(Expression expression, Configuration config)` Static factory method to make a pattern by converting an expression.
`static byte` `getAxisForPathStep(Expression step)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### PatternMaker

    public PatternMaker()

Method Detail

### fromExpression

    public static Pattern fromExpression(Expression expression,
                                         Configuration config)
                                  throws XPathException

  Static factory method to make a pattern by converting an expression. The supplied expression is the equivalent expression to the pattern, in the sense that it takes the same syntactic form.

  Note that this method does NOT check all the rules for XSLT patterns; it deliberately allows a (slightly) wider class of expressions to be converted than XSLT allows.

  The expression root() at the start of the expression has a special meaning: it refers to the root of the subtree in which the pattern must match, which can be supplied at run-time during pattern matching. This is used for patterns that represent streamable path expressions.

  Parameters:
    `expression` - the expression to be converted
    `config` - the Saxon configuration
  Throws:
    `XPathException` - if the expression cannot be converted

### getAxisForPathStep

    public static byte getAxisForPathStep(Expression step)
                                   throws XPathException

  Throws:
    `XPathException`

Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.