/**
* Statically analyze a query for various properties.
*
* @param query the query to analyze
* @param params parameters for the query; if necessary parameters are left out they will be
* listed as required variables in the analysis
* @return a query analysis facet
*/
public QueryAnalysis analyze(String query, Object... params) {
if (presub) query = presub(query, params);
long t1 = System.currentTimeMillis(), t2 = 0, t3 = 0;
DBBroker broker = null;
try {
broker = db.acquireBroker();
prepareContext(broker);
final org.exist.source.Source source = buildQuerySource(query, params, "analyze");
final XQuery xquery = broker.getXQueryService();
final XQueryPool pool = xquery.getXQueryPool();
CompiledXQuery compiledQuery = pool.borrowCompiledXQuery(broker, source);
try {
AnalysisXQueryContext context;
if (compiledQuery == null) {
context = new AnalysisXQueryContext(broker, AccessContext.INTERNAL_PREFIX_LOOKUP);
buildXQueryStaticContext(context, false);
buildXQueryDynamicContext(context, params, null, false);
t2 = System.currentTimeMillis();
compiledQuery = xquery.compile(context, source);
t3 = System.currentTimeMillis();
} else {
context = (AnalysisXQueryContext) compiledQuery.getContext();
t2 = System.currentTimeMillis();
}
return new QueryAnalysis(
compiledQuery,
Collections.unmodifiableSet(context.requiredVariables),
Collections.unmodifiableSet(context.requiredFunctions));
} finally {
if (compiledQuery != null) pool.returnCompiledXQuery(source, compiledQuery);
}
} catch (XPathException e) {
LOG.warn(
"query compilation failed -- "
+ query
+ " -- "
+ (params == null ? "" : " with params " + Arrays.asList(params))
+ (bindings.isEmpty() ? "" : " and bindings " + bindings));
throw new DatabaseException("failed to compile query", e);
} catch (IOException e) {
throw new DatabaseException("unexpected exception", e);
} catch (PermissionDeniedException e) {
throw new DatabaseException("permission denied", e);
} finally {
db.releaseBroker(broker);
STATS.update(query, t1, t2, t3, 0, System.currentTimeMillis());
}
}
ItemList executeQuery(String query, WrapperFactory wrapperFactory, Object[] params) {
long t1 = System.currentTimeMillis(), t2 = 0, t3 = 0, t4 = 0;
if (presub) query = presub(query, params);
DBBroker broker = null;
try {
broker = db.acquireBroker();
prepareContext(broker);
if (overrideDocs != null) docs = overrideDocs;
final org.exist.source.Source source = buildQuerySource(query, params, "execute");
final XQuery xquery = broker.getXQueryService();
final XQueryPool pool = xquery.getXQueryPool();
CompiledXQuery compiledQuery = pool.borrowCompiledXQuery(broker, source);
MutableDocumentSet docsToLock = new DefaultDocumentSet();
if (docs != null) docsToLock.addAll(docs);
if (base != null) docsToLock.addAll(base.getDocumentSet());
try {
XQueryContext context;
if (compiledQuery == null) {
context = xquery.newContext(AccessContext.INTERNAL_PREFIX_LOOKUP);
buildXQueryStaticContext(context, true);
} else {
context = compiledQuery.getContext();
// static context already set
}
buildXQueryDynamicContext(context, params, docsToLock, true);
t2 = System.currentTimeMillis();
if (compiledQuery == null) {
compiledQuery = xquery.compile(context, source);
t3 = System.currentTimeMillis();
}
docsToLock.lock(broker, false, false);
try {
return new ItemList(
xquery.execute(wrap(compiledQuery, wrapperFactory, context), base),
namespaceBindings.extend(),
db);
} finally {
docsToLock.unlock(false);
t4 = System.currentTimeMillis();
}
} finally {
if (compiledQuery != null) pool.returnCompiledXQuery(source, compiledQuery);
}
} catch (XPathException e) {
LOG.debug(
"query execution failed -- "
+ query
+ " -- "
+ (params == null ? "" : " with params " + Arrays.asList(params))
+ (bindings.isEmpty() ? "" : " and bindings " + bindings));
throw new DatabaseException("failed to execute query", e);
} catch (IOException e) {
throw new DatabaseException("unexpected exception", e);
} catch (LockException e) {
throw new DatabaseException("deadlock", e);
} catch (PermissionDeniedException e) {
throw new DatabaseException("permission denied", e);
} finally {
db.releaseBroker(broker);
STATS.update(query, t1, t2, t3, t4, System.currentTimeMillis());
}
}
/*
* (non-Javadoc)
*
* @see org.exist.xupdate.Modification#process(org.exist.dom.DocumentSet)
*/
public long process(Txn transaction)
throws PermissionDeniedException, LockException, EXistException, XPathException {
NodeList children = content;
if (children.getLength() == 0) return 0;
int modifications = children.getLength();
try {
StoredNode ql[] = selectAndLock(transaction);
IndexListener listener = new IndexListener(ql);
NotificationService notifier = broker.getBrokerPool().getNotificationService();
Node temp;
TextImpl text;
AttrImpl attribute;
ElementImpl parent;
for (int i = 0; i < ql.length; i++) {
StoredNode node = ql[i];
if (node == null) {
LOG.warn("select " + selectStmt + " returned empty node");
continue;
}
DocumentImpl doc = (DocumentImpl) node.getOwnerDocument();
doc.getMetadata().setIndexListener(listener);
if (!doc.getPermissions().validate(broker.getUser(), Permission.UPDATE))
throw new PermissionDeniedException("permission to update document denied");
switch (node.getNodeType()) {
case Node.ELEMENT_NODE:
if (modifications == 0) modifications = 1;
((ElementImpl) node).update(transaction, children);
break;
case Node.TEXT_NODE:
parent = (ElementImpl) node.getParentNode();
temp = children.item(0);
text = new TextImpl(temp.getNodeValue());
modifications = 1;
text.setOwnerDocument(doc);
parent.updateChild(transaction, node, text);
break;
case Node.ATTRIBUTE_NODE:
parent = (ElementImpl) node.getParentNode();
if (parent == null) {
LOG.warn("parent node not found for " + node.getNodeId());
break;
}
AttrImpl attr = (AttrImpl) node;
temp = children.item(0);
attribute = new AttrImpl(attr.getQName(), temp.getNodeValue());
attribute.setOwnerDocument(doc);
parent.updateChild(transaction, node, attribute);
break;
default:
throw new EXistException("unsupported node-type");
}
doc.getMetadata().clearIndexListener();
doc.getMetadata().setLastModified(System.currentTimeMillis());
modifiedDocuments.add(doc);
broker.storeXMLResource(transaction, doc);
notifier.notifyUpdate(doc, UpdateListener.UPDATE);
}
checkFragmentation(transaction, modifiedDocuments);
} finally {
unlockDocuments(transaction);
}
return modifications;
}