Examples of org.exist.xquery.Expression.eval()

org.exist.xquery.Expression.eval()
Evaluate the expression represented by this object. Depending on the context in which this expression is executed, either the context sequence, the context item or both of them may be set. An implementing class should know how to handle this. The general contract is as follows: if the {@link Dependency#CONTEXT_ITEM}bit is set in the bit field returned by {@link #getDependencies()}, the eval method will be called once for every item in the context sequence. The contextItem parameter will be set to the current item. Otherwise, the eval method will only be called once for the whole context sequence and contextItem will be null. eXist tries to process the entire context set in one, single step whenever possible. Thus, most classes only expect context to contain a list of nodes which represents the current context of the expression. The position() function in XPath is an example for an expression, which requires both, context sequence and context item to be set. The context sequence might be a node set, a sequence of atomic values or a single node or atomic value. @param contextSequence the current context sequence. @param contextItem a single item, taken from context. This defines the item,the expression should work on.

  }
  
  private void processAll() throws XPathException {
    for(int i = 0; i < orderSpecs.length; i++) {
      final Expression expr = orderSpecs[i].getSortExpression();
      final NodeSet result = expr.eval(null).toNodeSet();
      for(final Iterator j = result.iterator(); j.hasNext(); ) {
        final NodeProxy p = (NodeProxy)j.next();
        ContextItem context = p.getContext();
        //TODO : review to consider transverse context
        while(context != null) {

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      {contextSequence = contextItem.toSequence();}


        Sequence result;
        boolean processInMem = false;
        final Expression arg = getArgument(0);
    final Sequence idval = arg.eval(contextSequence);
    
    if(idval.isEmpty() || (getArgumentCount() == 1 && contextSequence != null && contextSequence.isEmpty()))
            {result = Sequence.EMPTY_SEQUENCE;}
        else {
        String nextId;

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                {item.addContextNode(getExpressionId(), item);}
            }
          }


          // evaluate argument expression
          final Sequence argSeq = arg.eval(result);
          NodeSet argSet;
          if (contextId != Expression.NO_CONTEXT_ID) {
            argSet = argSeq.toNodeSet().getContextNodes(contextId);
          } else {
            argSet = argSeq.toNodeSet().getContextNodes(getExpressionId());

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          } else {
        //are there 2 or 3 arguments to this function?
        if(getArgumentCount() > 2) {
          argLength = getArgument(2);
                    NumericValue length = new IntegerValue(sourceString.length());
                    length = ((NumericValue)(argLength.eval(contextSequence).itemAt(0).convertTo(Type.NUMBER))).round();


                    // Relocate length to position according to spec:
                    // fn:round($startingLoc) <=
                    // $p 
                    // < fn:round($startingLoc) + fn:round($length)

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            if (contextStep == null || preselectResult == null) {
                // no optimization: process the whole expression
                final NodeSet nodes =
                    path == null
                        ? contextSequence.toNodeSet()
                        : path.eval(contextSequence).toNodeSet();
                final List<String> terms = getSearchTerms(contextSequence);
                result = evalQuery(nodes, terms).toNodeSet();
            } else {
                contextStep.setPreloadedData(contextSequence.getDocumentSet(), preselectResult);
                result = path.eval(contextSequence).toNodeSet();

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                        : path.eval(contextSequence).toNodeSet();
                final List<String> terms = getSearchTerms(contextSequence);
                result = evalQuery(nodes, terms).toNodeSet();
            } else {
                contextStep.setPreloadedData(contextSequence.getDocumentSet(), preselectResult);
                result = path.eval(contextSequence).toNodeSet();
            }
            if(canCache && contextSequence.isCacheable())
        {cached = new CachedResult(contextSequence, contextItem, result);}


    // otherwise we have to walk through each item in the context

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        current = i.nextItem();
        final List<String> terms = getSearchTerms(contextSequence);
        nodes =
          path == null
          ? contextSequence.toNodeSet()
              : path
              .eval(current.toSequence()).toNodeSet();
        temp = evalQuery(nodes, terms);
        result.addAll(temp);
      }
    }

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    final List<String> terms = new ArrayList<String>();
    Expression next;
    Sequence seq;
    for(int i = 1; i < getLength(); i++) {
      next = getArgument(i);
      seq = next.eval(contextSequence);
      if(seq.hasOne())
          {terms.add(translateRegexp(seq.itemAt(0).getStringValue()));}
      else {
        for(final SequenceIterator it = seq.iterate(); it.hasNext(); ) {
            terms.add(translateRegexp(it.nextItem().getStringValue()));

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            //START workaround: evaluate global variables in modules, as they are reset by XQueryContext.reset()
            final Expression rootExpr = xqueryContext.getRootExpression();
            for(int i = 0; i < rootExpr.getSubExpressionCount(); i++) {
                final Expression subExpr = rootExpr.getSubExpression(i);
                if(subExpr instanceof VariableDeclaration) {
                    subExpr.eval(null);
                }
            }
            //END workaround
            
            //setup monitoring

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    if (contextItem != null)
      {contextSequence = contextItem.toSequence();}
      
    final Sequence seq1 = arg0.eval(contextSequence);
    final Sequence seq2 = arg1.eval(contextSequence);


        String value;
        String cmp;
        Sequence result;
    if (seq1.isEmpty()) {

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