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## org.exist.storage
Class NativeElementIndex

    java.lang.Object
      java.util.Observable
          org.exist.storage.ElementIndex
              org.exist.storage.NativeElementIndex

All Implemented Interfaces:
  ContentLoadingObserver

public class NativeElementIndex
extends ElementIndex
implements ContentLoadingObserver

The indexing occurs in this class. That is, during the loading of a document into the database, the process of associating a long gid with each element, and the subsequent storing of the `NodeProxy` on disk.

Constructor Summary
`NativeElementIndex(DBBroker broker, BFile dbNodes)`

Method Summary
`void` | `addNode(QName qname, NodeProxy proxy)` Store the given node in the node index.
`boolean` | `close()`
`void` | `consistencyCheck(DocumentImpl document)`
`void` | `dropIndex(Collection collection)` Drop all index entries for the given collection.
`void` | `dropIndex(DocumentImpl document)` Drop all index entries for the given document.
`void` | `endElement(int xpathType, ElementImpl node, java.lang.String content)` store and index given element (called storeElement before)
`NodeSet` | `findDescendantsByTagName(byte type, QName qname, int axis, DocumentSet docs, ExtArrayNodeSet contextSet, int contextId)` Optimized lookup method which directly implements the ancestor-descendant join.
`NodeSet` | `findElementsByTagName(byte type, DocumentSet docs, QName qname, NodeSelector selector)` Lookup elements or attributes in the index matching a given `QName` and `NodeSelector`.
`void` | `flush()` writes the pending items, for the current document's collection
`void` | `printStatistics()`
`void` | `reindex(DocumentImpl document, StoredNode node)` Reindexes all pending items for the specified document.
`void` | `remove()` remove all pending modifications, for the current document.
`void` | `removeElement(ElementImpl node, NodePath currentPath, java.lang.String content)` Mark given Element for removal; added entries are written to the list of pending entries.
`Occurrences[]` | `scanIndexedElements(Collection collection, boolean inclusive)`
`void` | `startElement(ElementImpl impl, NodePath currentPath, boolean index)` corresponds to SAX function of the same name
`void` | `storeAttribute(AttrImpl node, NodePath currentPath, boolean fullTextIndexSwitch)` store and index given attribute
`void` | `storeText(TextImpl node, NodePath currentPath, boolean fullTextIndexSwitch)` store and index given text node
`void` | `sync()` triggers a cache sync, i.e.
`java.lang.String` | `toString()`

Methods inherited from class org.exist.storage.ElementIndex
`setDocument, setInUpdateMode`

Methods inherited from class java.util.Observable
`addObserver, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers`

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

Methods inherited from interface org.exist.storage.ContentLoadingObserver
`setDocument`

Constructor Detail

### NativeElementIndex

    public NativeElementIndex(DBBroker broker,
                              BFile dbNodes)

Method Detail

### addNode

    public void addNode(QName qname,
                        NodeProxy proxy)

  Store the given node in the node index.

  Parameters:
    `qname` - The node's identity
    `proxy` - The node's proxy

### storeAttribute

    public void storeAttribute(AttrImpl node,
                               NodePath currentPath,
                               boolean fullTextIndexSwitch)

  Description copied from interface: `ContentLoadingObserver`
  store and index given attribute

  Specified by:
    `storeAttribute` in interface `ContentLoadingObserver`

### storeText

    public void storeText(TextImpl node,
                          NodePath currentPath,
                          boolean fullTextIndexSwitch)

  Description copied from interface: `ContentLoadingObserver`
  store and index given text node

  Specified by:
    `storeText` in interface `ContentLoadingObserver`

### startElement

    public void startElement(ElementImpl impl,
                             NodePath currentPath,
                             boolean index)

  Description copied from interface: `ContentLoadingObserver`
  corresponds to SAX function of the same name

  Specified by:
    `startElement` in interface `ContentLoadingObserver`

### endElement

    public void endElement(int xpathType,
                           ElementImpl node,
                           java.lang.String content)

  Description copied from interface: `ContentLoadingObserver`
  store and index given element (called storeElement before)

  Specified by:
    `endElement` in interface `ContentLoadingObserver`

### removeElement

    public void removeElement(ElementImpl node,
                              NodePath currentPath,
                              java.lang.String content)

  Description copied from interface: `ContentLoadingObserver`
  Mark given Element for removal; added entries are written to the list of pending entries. `ContentLoadingObserver.flush()` is called later to flush all pending entries.
  Notes: changed name from storeElement()

  Specified by:
    `removeElement` in interface `ContentLoadingObserver`

### sync

    public void sync()

  Description copied from interface: `ContentLoadingObserver`
  triggers a cache sync, i.e. forces to write out all cached pages. sync() is called from time to time by the background sync daemon.

  Specified by:
    `sync` in interface `ContentLoadingObserver`

### flush

    public void flush()

  Description copied from interface: `ContentLoadingObserver`
  writes the pending items, for the current document's collection

  Specified by:
    `flush` in interface `ContentLoadingObserver`

### remove

    public void remove()

  Description copied from interface: `ContentLoadingObserver`
  remove all pending modifications, for the current document.

  Specified by:
    `remove` in interface `ContentLoadingObserver`

### dropIndex

    public void dropIndex(Collection collection)

  Description copied from interface: `ContentLoadingObserver`
  Drop all index entries for the given collection.

  Specified by:
    `dropIndex` in interface `ContentLoadingObserver`
  Parameters:
    `collection` -

### dropIndex

    public void dropIndex(DocumentImpl document)
                   throws ReadOnlyException

  Description copied from interface: `ContentLoadingObserver`
  Drop all index entries for the given document.

  Specified by:
    `dropIndex` in interface `ContentLoadingObserver`
  Parameters:
    `document` -
  Throws:
    `ReadOnlyException`

### reindex

    public void reindex(DocumentImpl document,
                        StoredNode node)

  Description copied from interface: `ContentLoadingObserver`
  Reindexes all pending items for the specified document.

  Specified by:
    `reindex` in interface `ContentLoadingObserver`
  Parameters:
    `document` - the document to be reindexed.
    `node` - if != null, only nodes being descendants of the specified node will be reindexed. Other nodes are not touched. This is used for a partial reindex.

### findElementsByTagName

    public NodeSet findElementsByTagName(byte type,
                                         DocumentSet docs,
                                         QName qname,
                                         NodeSelector selector)

  Lookup elements or attributes in the index matching a given `QName` and `NodeSelector`. The NodeSelector argument is optional. If selector is null, all elements or attributes matching qname will be returned.

  Specified by:
    `findElementsByTagName` in class `ElementIndex`
  Parameters:
    `type` - either `ElementValue.ATTRIBUTE`, `ElementValue.ELEMENT` or `ElementValue.ATTRIBUTE_ID`
    `docs` - the set of documents to look up in the index
    `qname` - the QName of the attribute or element
    `selector` - an (optional) NodeSelector

### findDescendantsByTagName

    public NodeSet findDescendantsByTagName(byte type,
                                            QName qname,
                                            int axis,
                                            DocumentSet docs,
                                            ExtArrayNodeSet contextSet,
                                            int contextId)

  Optimized lookup method which directly implements the ancestor-descendant join. The algorithm does directly operate on the input stream containing the potential descendant nodes. It thus needs less comparisons than `findElementsByTagName(byte, DocumentSet, QName, NodeSelector)`.

  Specified by:
    `findDescendantsByTagName` in class `ElementIndex`
  Parameters:
    `type` - either `ElementValue.ATTRIBUTE`, `ElementValue.ELEMENT` or `ElementValue.ATTRIBUTE_ID`
    `docs` - the set of documents to look up in the index
    `contextSet` - the set of ancestor nodes for which the method will try to find descendants
    `contextId` - id of the current context expression as passed by the query engine
    `qname` - the QName to search for

### scanIndexedElements

    public Occurrences[] scanIndexedElements(Collection collection,
                                             boolean inclusive)
                                      throws PermissionDeniedException

  Specified by:
    `scanIndexedElements` in class `ElementIndex`
  Throws:
    `PermissionDeniedException`

### consistencyCheck

    public void consistencyCheck(DocumentImpl document)
                          throws EXistException

  Throws:
    `EXistException`

### close

    public boolean close()
                  throws DBException

  Throws:
    `DBException`

### printStatistics

    public void printStatistics()

### toString

    public java.lang.String toString()

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Copyright (C) Wolfgang Meier. All rights reserved.