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## net.sf.saxon.functions
Class KeyFn.SubtreeFilter

    java.lang.Object
      net.sf.saxon.functions.KeyFn.SubtreeFilter

All Implemented Interfaces:
  ItemMappingFunction<NodeInfo,NodeInfo>

Enclosing class:
  KeyFn

    public static class KeyFn.SubtreeFilter

extends Object
implements ItemMappingFunction<NodeInfo,NodeInfo>

Mapping class to filter nodes that have the origin node as an ancestor-or-self

Constructor Summary
`KeyFn.SubtreeFilter(NodeInfo origin)`

Method Summary
`NodeInfo` | `mapItem(NodeInfo item)` Map one item to another item.

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

Constructor Detail

### KeyFn.SubtreeFilter

    public KeyFn.SubtreeFilter(NodeInfo origin)

Method Detail

### mapItem

    public NodeInfo mapItem(NodeInfo item)
                     throws XPathException

  Description copied from interface: `ItemMappingFunction`
  Map one item to another item.

  Specified by:
    `mapItem` in interface `ItemMappingFunction<NodeInfo,NodeInfo>`
  Parameters:
    `item` - The input item to be mapped.
  Returns:
    either the output item, or null.
  Throws:
    `XPathException` - if a dynamic error occurs

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Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.