Esempio n. 1
0
  /**
   * 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());
    }
  }
Esempio n. 2
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 /**
  * Convert the given object into a value appropriate for being defined as the value of a variable
  * in an XQuery. This will extract a sequence out of all database objects, convert collections and
  * arrays into sequences recursively, convert <code>null</code> into an empty sequence, and pass
  * other objects through untouched. Convertible objects that are defined in the JDK will be
  * automatically converted by eXist.
  *
  * @see org.exist.xquery.XPathUtil#javaObjectToXPath(Object, XQueryContext, boolean)
  * @param o the object to convert to a database value
  * @return the converted value, ready for assignment to an XQuery variable
  */
 @SuppressWarnings("unchecked")
 private Object convertValue(Object o) {
   if (o == null) return Collections.emptyList();
   if (o instanceof Resource) {
     try {
       return ((Resource) o).convertToSequence();
     } catch (UnsupportedOperationException e) {
       return o;
     }
   }
   List<Object> list = null;
   if (o instanceof Collection) list = new ArrayList<Object>((Collection) o);
   else if (o instanceof Object[]) list = new ArrayList<Object>(Arrays.asList((Object[]) o));
   if (list != null) {
     for (ListIterator<Object> it = list.listIterator(); it.hasNext(); ) {
       it.set(convertValue(it.next()));
     }
     return list;
   }
   return DataUtils.toXMLObject(o);
 }
Esempio n. 3
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 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());
   }
 }
Esempio n. 4
0
 /**
  * Limit the root documents accessible to the query to the given list, overriding the any set
  * derived from the query's context. The query will still be able to access other documents
  * through bound variables or by naming them directly, though.
  *
  * @param rootDocs the list of root documents to limit the query to
  * @return this service, to chain calls
  */
 public QueryService limitRootDocuments(XMLDocument... rootDocs) {
   return limitRootDocuments(Arrays.asList(rootDocs));
 }