Package net.sf.saxon.om

Examples of net.sf.saxon.om.SequenceIterator

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        // Setting properties
        for (Map.Entry<String, Object> entry : properties.entrySet()) {
            dynamicContext.setParameter(entry.getKey(), transformProperty(entry.getValue(), config));
        }

        SequenceIterator iterator = null;
        Configuration oldConfigValue = SaxonDataBindingHelper.CURR_EXECUTING_CONFIG;
        SaxonDataBindingHelper.CURR_EXECUTING_CONFIG = config;
        try {
            iterator = exp.iterator(dynamicContext);
        } finally {
            SaxonDataBindingHelper.CURR_EXECUTING_CONFIG = oldConfigValue;
        }
       
        ItemList list = new ItemList();
        Item item = iterator.next();
              
        while (item != null) {
          list.add(item);
          item = iterator.next();
         
        }
       
        if (list.size() == 0) {
            return null;
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    public String evaluateAsString(Exchange exchange) throws Exception {
        initialize(exchange);

        StringWriter buffer = new StringWriter();
        SequenceIterator iter = getExpression().iterator(createDynamicContext(exchange));
        for (Item item = iter.next(); item != null; item = iter.next()) {
            buffer.append(item.getStringValueCS());
        }
        return buffer.toString();
    }
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    public String evaluateAsString(Exchange exchange) throws Exception {
        initialize(exchange);

        StringWriter buffer = new StringWriter();
        SequenceIterator iter = getExpression().iterator(createDynamicContext(exchange));
        for (Item item = iter.next(); item != null; item = iter.next()) {
            buffer.append(item.getStringValueCS());
        }

        String answer = buffer.toString();
        buffer.close();
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    /**
    * Evaluate the expression
    */

    public Item evaluateItem(XPathContext context) throws XPathException {
        SequenceIterator forwards = operand.iterate(context);
        if (forwards instanceof ReversibleIterator) {
            return ((ReversibleIterator)forwards).getReverseIterator().next();
        } else {
            Item current = null;
            while (true) {
                Item item = forwards.next();
                if (item == null) {
                    return current;
                }
                current = item;
            }
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    }

    public void writeSequence(OutputStream os, Properties props) throws XQException {
        checkNotClosed();
        checkOnlyReadOnce();
        SequenceIterator iter = iterator;
        if (isOnItem()) {
            iter = new Insert.InsertIterator(
                    SingletonIterator.makeIterator(iter.current()),
                    iter, 0);
        }
        try {
            QueryResult.serializeSequence(iter, getConfiguration(), os, props);
        } catch (XPathException e) {
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        if (ow instanceof PrintWriter) {
            pw = (PrintWriter)ow;
        } else {
            pw = new PrintWriter(ow);
        }
        SequenceIterator iter = iterator;
        if (isOnItem()) {
            iter = new Insert.InsertIterator(
                    SingletonIterator.makeIterator(iter.current()),
                    iter, 0);
        }
        try {
            QueryResult.serializeSequence(iter, getConfiguration(), pw, props);
        } catch (XPathException e) {
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        // iteration of the filter expression than are absolutely essential.

        // The code is almost identical to the code in ExpressionTool#effectiveBooleanValue
        // except for the handling of a numeric result

        SequenceIterator iterator = filter.iterate(filterContext);
        Item first = iterator.next();
        if (first == null) {
            return false;
        }
        if (first instanceof NodeInfo) {
            return true;
        } else {
            if (first instanceof BooleanValue) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a boolean");
                }
                return ((BooleanValue)first).getBooleanValue();
            } else if (first instanceof StringValue) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a string");
                }
                return (first.getStringValueCS().length()!=0);
            } else if (first instanceof Int64Value) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a numeric value");
                }
                return ((Int64Value)first).longValue() == base.position();

            } else if (first instanceof NumericValue) {
                if (iterator.next() != null) {
                    ExpressionTool.ebvError("sequence of two or more items starting with a numeric value");
                }
                return ((NumericValue)first).compareTo(base.position()) == 0;
            } else {
                ExpressionTool.ebvError("sequence starting with an atomic value other than a boolean, number, or string");
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            return this;
        }
    }

    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator iter = new SortedTupleIterator(context, select.iterate(context), comparators);
        return new MappingIterator(iter, TupleUnwrapper.getInstance());
    }
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    /**
    * Evaluate the function in a boolean context
    */

    public boolean effectiveBooleanValue(XPathContext c) throws XPathException {
        SequenceIterator iter = argument[0].iterate(c);
        boolean result = false;
        if ((iter.getProperties() & SequenceIterator.LOOKAHEAD) != 0) {
            switch (operation) {
                case EXISTS:
                    result = ((LookaheadIterator)iter).hasNext();
                    break;
                case EMPTY:
                    result = !((LookaheadIterator)iter).hasNext();
                    break;
            }
        } else {
            switch (operation) {
                case EXISTS:
                    result = iter.next() != null;
                    break;
                case EMPTY:
                    result = iter.next() == null;
                    break;
            }
        }
        iter.close();
        return result;
    }
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    /**
    * Evaluate the function to return an iteration of selected nodes.
    */

    public SequenceIterator iterate(XPathContext context) throws XPathException {
        SequenceIterator seq = argument[0].iterate(context);
        AtomicValue n0 = (AtomicValue)argument[1].evaluateItem(context);
        NumericValue n = (NumericValue)n0;
        int pos = (int)n.longValue();
        SequenceIterator ins = argument[2].iterate(context);
        return new InsertIterator(seq, ins, pos);
    }
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Related Classes of net.sf.saxon.om.SequenceIterator

  • net.sf.saxon.dom.DOMNodeList
  • net.sf.saxon.evpull.Decomposer
  • net.sf.saxon.expr.AtomicMappingExpression
  • net.sf.saxon.expr.AtomicSequenceConverter
  • net.sf.saxon.expr.CardinalityChecker
  • net.sf.saxon.expr.CastableExpression
  • net.sf.saxon.expr.ComputedExpression
  • net.sf.saxon.expr.ContextMappingIterator
  • net.sf.saxon.expr.ConvertToString
  • net.sf.saxon.expr.FilterExpression
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