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eXist-db NoSQL Database Core
/*
* eXist-db Open Source Native XML Database
* Copyright (C) 2001 The eXist-db Authors
*
* [email protected]
* http://www.exist-db.org
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.exist.indexing;
import org.exist.dom.persistent.AttrImpl;
import org.exist.dom.persistent.NodeProxy;
import org.exist.dom.persistent.TextImpl;
import org.exist.dom.persistent.AbstractCharacterData;
import org.exist.dom.persistent.ElementImpl;
import org.exist.dom.persistent.DocumentImpl;
import org.exist.dom.persistent.IStoredNode;
import org.exist.collections.Collection;
import org.exist.indexing.StreamListener.ReindexMode;
import org.exist.storage.DBBroker;
import org.exist.storage.NodePath;
import org.exist.storage.txn.Txn;
import org.exist.util.DatabaseConfigurationException;
import org.exist.xquery.QueryRewriter;
import org.exist.xquery.XQueryContext;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.exist.security.PermissionDeniedException;
/**
* Internally used to dispatch an operation to each of the
* registered indexes. An IndexController instance can be
* retrieved via {@link org.exist.storage.DBBroker#getIndexController()}.
*/
public class IndexController {
private final Map indexWorkers = new HashMap<>();
private final DBBroker broker;
private StreamListener listener = null;
private DocumentImpl currentDoc = null;
private ReindexMode currentMode = ReindexMode.UNKNOWN;
private boolean reindexing;
public IndexController(final DBBroker broker) {
this.broker = broker;
final List workers = broker.getBrokerPool().getIndexManager().getWorkers(broker);
for (final IndexWorker worker : workers) {
indexWorkers.put(worker.getIndexId(), worker);
}
}
/**
* Configures all index workers registered with the db instance.
*
* @param configNodes lists the top-level child nodes below the <index> element in collection.xconf
* @param namespaces the active prefix/namespace map
* @return an arbitrary configuration object to be kept for this index in the collection configuration
* @throws DatabaseConfigurationException if a configuration error occurs
*/
public Map configure(final NodeList configNodes, final Map namespaces) throws DatabaseConfigurationException {
final Map map = new HashMap<>();
for (final IndexWorker indexWorker : indexWorkers.values()) {
final Object conf = indexWorker.configure(this, configNodes, namespaces);
if (conf != null) {
map.put(indexWorker.getIndexId(), conf);
}
}
return map;
}
/**
* Returns an {@link org.exist.indexing.IndexWorker} instance corresponding
* to the specified type of index in indexId. The indexId should be the same one
* as returned by {@link org.exist.indexing.IndexWorker#getIndexId()}.
*
* @param indexId The id of the index
* @return instance of index worker
*/
public IndexWorker getWorkerByIndexId(final String indexId) {
return indexWorkers.get(indexId);
}
/**
* Returns an {@link org.exist.indexing.IndexWorker} instance corresponding
* to the specified index named by indexName. The indexName should be the same one
* as returned by {@link org.exist.indexing.IndexWorker#getIndexName()}.
*
* @param indexName The name of the index
* @return instance of index worker
*/
public IndexWorker getWorkerByIndexName(final String indexName) {
for (final IndexWorker worker : indexWorkers.values()) {
if (indexName.equals(worker.getIndexName())) {
return worker;
}
}
return null;
}
/**
* Sets the document for the next operation.
*
* @param doc the document
*
* @deprecated use getStreamListener(DocumentImpl, ReindexMode)
*/
@Deprecated
public void setDocument(final DocumentImpl doc) {
if (currentDoc != doc) {
//Reset listener
listener = null;
}
currentDoc = doc;
for (final IndexWorker indexWorker : indexWorkers.values()) {
indexWorker.setDocument(currentDoc);
}
}
/**
* Sets the the mode for the next operation.
*
* @param mode the mode, one of {@link ReindexMode#UNKNOWN}, {@link ReindexMode#STORE},
* {@link ReindexMode#REMOVE_SOME_NODES} or {@link ReindexMode#REMOVE_ALL_NODES}.
*
* @deprecated use getStreamListener(DocumentImpl, ReindexMode)
*/
@Deprecated
public void setMode(final ReindexMode mode) {
if (currentMode != mode) {
//Reset listener
listener = null;
}
currentMode = mode;
for (final IndexWorker indexWorker : indexWorkers.values()) {
indexWorker.setMode(currentMode);
}
}
/**
* Returns the document for the next operation.
*
* @return the document
*/
public DocumentImpl getDocument() {
return currentDoc;
}
/**
* Returns the mode for the next operation.
*
* @return the document
*/
public ReindexMode getMode() {
return currentMode;
}
/**
* Sets the document and the mode for the next operation.
*
* @param doc the document
* @param mode the mode, one of {@link ReindexMode#UNKNOWN}, {@link ReindexMode#STORE},
* {@link ReindexMode#REMOVE_SOME_NODES} or {@link ReindexMode#REMOVE_ALL_NODES}.
*
* @deprecated use getStreamListener(DocumentImpl, ReindexMode)
*/
@Deprecated
public void setDocument(final DocumentImpl doc, final ReindexMode mode) {
setDocument(doc);
setMode(mode);
}
/**
* Flushes all index workers.
*/
public void flush() {
indexWorkers.values().forEach(IndexWorker::flush);
}
/**
* Remove all indexes defined on the specified collection.
*
* @param collection the collection to remove
* @param broker the broker that will perform the operation
* @param reindex enable or disable reindexing after removal
* @throws PermissionDeniedException in case user does not have sufficient rights
*/
public void removeCollection(final Collection collection, final DBBroker broker, final boolean reindex)
throws PermissionDeniedException {
for (final IndexWorker indexWorker : indexWorkers.values()) {
indexWorker.removeCollection(collection, broker, reindex);
}
}
/**
* Re-index all nodes below the specified root node, using the given mode.
*
* @param transaction the current transaction
* @param reindexRoot the node from which reindexing should occur
* @param mode the mode, one of {@link ReindexMode#UNKNOWN}, {@link ReindexMode#STORE},
* {@link ReindexMode#REMOVE_SOME_NODES} or {@link ReindexMode#REMOVE_ALL_NODES}.
*/
public void reindex(final Txn transaction, final IStoredNode reindexRoot, final ReindexMode mode) {
if (reindexRoot == null) {
return;
}
setReindexing(true);
try {
final IStoredNode node = broker.objectWith(new NodeProxy(reindexRoot.getOwnerDocument(), reindexRoot.getNodeId()));
listener = getStreamListener(node.getOwnerDocument(), mode);
listener.startIndexDocument(transaction);
try {
IndexUtils.scanNode(broker, transaction, node, listener);
} finally {
listener.endIndexDocument(transaction);
}
flush();
} finally {
setReindexing(false);
}
}
public boolean isReindexing() {
return reindexing;
}
private void setReindexing(final boolean reindexing) {
this.reindexing = reindexing;
}
/**
* When adding or removing nodes to or from the document tree, it might become
* necessary to re-index some parts of the tree, in particular if indexes are defined
* on mixed content nodes. This method will return the top-most root.
*
* @param node the node to be modified.
* @param path the NodePath of the node
* @param insert TODO: document
* @return the top-most root node to be re-indexed
*/
public IStoredNode getReindexRoot(final IStoredNode node, final NodePath path, final boolean insert) {
return getReindexRoot(node, path, insert, false);
}
/**
* When adding or removing nodes to or from the document tree, it might become
* necessary to re-index some parts of the tree, in particular if indexes are defined
* on mixed content nodes. This method will return the top-most root.
*
* @param node the node to be modified.
* @param path path the NodePath of the node
* @param insert TODO: document
* @param includeSelf if set to true, the current node itself will be included in the check
* @return the top-most root node to be re-indexed
*/
public IStoredNode getReindexRoot(final IStoredNode node, final NodePath path, final boolean insert, final boolean includeSelf) {
IStoredNode next;
IStoredNode top = null;
for (final IndexWorker indexWorker : indexWorkers.values()) {
next = indexWorker.getReindexRoot(node, path, insert, includeSelf);
if (next != null && (top == null || top.getNodeId().isDescendantOf(next.getNodeId()))) {
top = next;
}
}
if (top != null && top.getNodeId().equals(node.getNodeId())) {
top = node;
}
return top;
}
public StreamListener getStreamListener(final DocumentImpl doc, final ReindexMode mode) {
setDocument(doc);
setMode(mode);
return getStreamListener();
}
/**
* Returns a chain of {@link org.exist.indexing.StreamListener}, one
* for each index configured on the current document for the current mode.
* Note that the chain is reinitialized when the operating mode changes.
* That allows workers to return different {@link org.exist.indexing.StreamListener}
* for each mode.
*
* @return the first listener in the chain of StreamListeners
*/
public StreamListener getStreamListener() {
if (listener != null) {
StreamListener next = listener;
while (next != null) {
// wolf: setDocument() should have been called before
// next.getWorker().setDocument(currentDoc, currentMode);
next = next.getNextInChain();
}
return listener;
}
StreamListener first = null;
StreamListener previous = null;
for (final IndexWorker worker : indexWorkers.values()) {
// wolf: setDocument() should have been called before
//worker.setDocument(currentDoc, currentMode);
final StreamListener current = worker.getListener();
if (first == null) {
first = current;
} else {
if (current != null) {
previous.setNextInChain(current);
}
}
if (current != null) {
previous = current;
}
}
listener = first;
return listener;
}
/**
* Helper method: index a single node which has been added during an XUpdate or XQuery update expression.
*
* @param transaction the current transaction
* @param node the node to index
* @param path the node's NodePath
* @param listener the StreamListener which receives the index events
*/
public void indexNode(final Txn transaction, final IStoredNode node, final NodePath path, final StreamListener listener) {
if (listener != null) {
switch (node.getNodeType()) {
case Node.ELEMENT_NODE:
listener.startElement(transaction, (ElementImpl) node, path);
break;
case Node.TEXT_NODE :
case Node.CDATA_SECTION_NODE :
listener.characters(transaction, (AbstractCharacterData) node, path);
break;
case Node.ATTRIBUTE_NODE :
listener.attribute(transaction, (AttrImpl) node, path);
break;
}
}
}
/**
* Helper method: indexing is starting for a document
*
* @param transaction the current transaction
* @param listener the StreamListener which receives the index events
*/
public void startIndexDocument(final Txn transaction, final StreamListener listener) {
if (listener != null) {
listener.startIndexDocument(transaction);
}
}
/**
* Helper method: index a single element node which has been added during an XUpdate or XQuery update expression.
*
* @param transaction the current transaction
* @param node the node to index
* @param path the node's NodePath
* @param listener the StreamListener which receives the index events
*/
public void startElement(final Txn transaction, final ElementImpl node, final NodePath path, final StreamListener listener) {
if (listener != null) {
listener.startElement(transaction, node, path);
}
}
/**
* Helper method: dispatch a single endElement event to the specified listener.
*
* @param transaction the current transaction
* @param node the node to index
* @param path the node's NodePath
* @param listener the StreamListener which receives index events
*/
public void endElement(final Txn transaction, final ElementImpl node, final NodePath path, final StreamListener listener) {
if (listener != null) {
listener.endElement(transaction, node, path);
}
}
/**
* Helper method: index a single attribute node which has been added during an XUpdate or XQuery update expression.
*
* @param transaction the current transaction
* @param node the node to index
* @param path the node's NodePath
* @param listener the StreamListener which receives the index events
*/
public void attribute(final Txn transaction, final AttrImpl node, final NodePath path, final StreamListener listener) {
if (listener != null) {
listener.attribute(transaction, node, path);
}
}
/**
* Helper method: index a single text node which has been added during an XUpdate or XQuery update expression.
*
* @param transaction the current transaction
* @param node the node to index
* @param path the node's NodePath
* @param listener the StreamListener which receives the index events
*/
public void characters(final Txn transaction, final TextImpl node, final NodePath path, final StreamListener listener) {
if (listener != null) {
listener.characters(transaction, node, path);
}
}
/**
* Helper method: indexing has finished for a document
*
* @param transaction the current transaction
* @param listener the StreamListener which receives the index events
*/
public void endIndexDocument(final Txn transaction, final StreamListener listener) {
if (listener != null) {
listener.endIndexDocument(transaction);
}
}
/**
* Returns the match listener for this node.
*
* @param proxy a proxy to the node.
* @return the MatchListener
*/
public MatchListener getMatchListener(final NodeProxy proxy) {
MatchListener first = null;
MatchListener previous = null;
for (final IndexWorker worker : indexWorkers.values()) {
final MatchListener current = worker.getMatchListener(broker, proxy);
if (current != null) {
if (first == null) {
first = current;
} else {
previous.setNextInChain(current);
}
previous = current;
}
}
return first;
}
public List getQueryRewriters(final XQueryContext context) {
final List rewriters = new ArrayList<>(5);
for (final IndexWorker indexWorker : indexWorkers.values()) {
final QueryRewriter rewriter = indexWorker.getQueryRewriter(context);
if (rewriter != null) {
rewriters.add(rewriter);
}
}
return rewriters;
}
}
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