Package net.sf.saxon.expr

Examples of net.sf.saxon.expr.Expression

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  private PathMapRoot projectColumns(PathMapRoot parentRoot, List<XMLTable.XMLColumn> columns, PathMapNode finalNode, AnalysisRecord record) {
    for (XMLColumn xmlColumn : columns) {
      if (xmlColumn.isOrdinal()) {
        continue;
      }
        Expression internalExpression = xmlColumn.getPathExpression().getInternalExpression();
        PathMap subMap = new PathMap(internalExpression);
        PathMapRoot subContextRoot = null;
        for (PathMapRoot root : subMap.getPathMapRoots()) {
        if (root.getRootExpression() instanceof ContextItemExpression || root.getRootExpression() instanceof RootExpression) {
          if (subContextRoot != null) {
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     */

    public LocalParam getLocalParam(int id) {
        Iterator<Expression> iter = body.iterateSubExpressions();
        while (iter.hasNext()) {
            Expression child = iter.next();
            if (child instanceof LocalParam && ((LocalParam)child).getParameterId() == id) {
                return (LocalParam)child;
            }
        }
        return null;
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        if ((contextNode == null) || !(contextNode instanceof Element) ||
                !(xpathExpr instanceof XPathExpressionImpl)) {
            return;
        }

        Expression expression = ((XPathExpressionImpl) xpathExpr).getInternalExpression();
        Iterator<Expression> subExpressions = (Iterator<Expression>) expression.iterateSubExpressions();

        if (!subExpressions.hasNext()) {
            return;
        }

        Expression subExpr = (Expression) subExpressions.next();

        if (!(subExpr instanceof PathExpression)) {
            return;
        }

        Document document = DOMUtils.toDOMDocument(contextNode);
        PathExpression pathExpr = (PathExpression) subExpr;
        Expression step = pathExpr.getFirstStep();

        while (step != null) {
            if (step instanceof AxisExpression) {
                AxisExpression axisExpr = (AxisExpression) step;

                NodeTest nodeTest = axisExpr.getNodeTest();

                if (!(nodeTest instanceof NameTest)) {
                    break;
                }

                NameTest nameTest = (NameTest) nodeTest;

                QName childName = getQualifiedName(nameTest.getFingerprint(),
                        namePool, contextUris);

                if (Axis.CHILD == axisExpr.getAxis()) {
                    if (NodeKindTest.ELEMENT.getNodeKindMask() != nameTest.getNodeKindMask()) {
                        break;
                    }

                    NodeList children = ((Element) contextNode).getElementsByTagNameNS(childName.getNamespaceURI(),
                            childName.getLocalPart());
                    if ((children == null) || (children.getLength() == 0)) {
                        Node child = document.createElementNS(childName.getNamespaceURI(),
                                DOMUtils.getQualifiedName(childName));
                        contextNode.appendChild(child);
                        contextNode = child;
                    } else if (children.getLength() == 1) {
                        contextNode = children.item(0);
                    } else {
                        break;
                    }
                } else if (Axis.ATTRIBUTE == axisExpr.getAxis()) {
                    if (NodeKindTest.ATTRIBUTE.getNodeKindMask() != nameTest.getNodeKindMask()) {
                        break;
                    }

                    Attr attribute = ((Element) contextNode).getAttributeNodeNS(childName.getNamespaceURI(), childName.getLocalPart());
                    if (attribute == null) {
                        attribute = document.createAttributeNS(childName.getNamespaceURI(), childName.getLocalPart());
                        ((Element) contextNode).setAttributeNode(attribute);
                        contextNode = attribute;
                    } else {
                        break;
                    }

                } else {
                    break;
                }


            } else if (step instanceof ItemChecker) {
                ItemChecker itemChecker = (ItemChecker) step;
                Expression baseExpr = itemChecker.getBaseExpression();

                if (!(baseExpr instanceof VariableReference)) {
                    break;
                }
            } else {
                break;
            }

            if (pathExpr != null) {
                Expression remainingSteps = pathExpr.getRemainingSteps();

                if (remainingSteps instanceof PathExpression) {
                    pathExpr = (PathExpression) remainingSteps;
                    step = pathExpr.getFirstStep();
                } else if (remainingSteps instanceof AxisExpression) {
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    * This is a pure function so it can be simplified in advance if the arguments are known
     * @param visitor an expression visitor
     */

     public Expression simplify(ExpressionVisitor visitor) throws XPathException {
        Expression e = simplifyArguments(visitor);
        if (e == this) {
            maybePrecompile(visitor);
        }
        return e;
    }
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     *          if an error is discovered during this phase
     *          (typically a type error)
     */

    public Expression optimize(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {
        Expression e = super.optimize(visitor, contextItemType);
        // try once again to compile the regular expression once if possible
        // (used when the regex has been identified as a constant as a result of earlier rewrites)
        if (e == this) {
            maybePrecompile(visitor);
        }
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        for (Iterator it=libraryList.iterator(); it.hasNext();) {
            FunctionLibrary lib = (FunctionLibrary)it.next();
            if (debug) {
                System.err.println("Trying " + lib.getClass().getName());
            }
            Expression func = lib.bind(functionName, staticArgs, env);
            if (func != null) {
                return func;
            }
        }
        if (debug) {
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            if (curr == null) {
                break;
            }
            if (curr instanceof XSLWhen) {
                conditions[w] = ((XSLWhen)curr).getCondition();
                Expression b = ((XSLWhen)curr).compileSequenceConstructor(
                        exec, curr.iterateAxis(Axis.CHILD), true);
                if (b == null) {
                    b = Literal.makeEmptySequence();
                }
                try {
                    b = makeExpressionVisitor().simplify(b);
                    actions[w] = b;
                } catch (XPathException e) {
                    compileError(e);
                }

                if (getPreparedStylesheet().isCompileWithTracing()) {
                    TraceWrapper trace = makeTraceInstruction((XSLWhen)curr, actions[w]);
                    actions[w] = trace;
                }

                // Optimize for constant conditions (true or false)
                if (conditions[w] instanceof Literal && ((Literal)conditions[w]).getValue() instanceof BooleanValue) {
                    if (((BooleanValue)((Literal)conditions[w]).getValue()).getBooleanValue()) {
                        // constant true: truncate the tests here
                        entries = w+1;
                        break;
                    } else {
                        // constant false: omit this test
                        w--;
                        entries--;
                    }
                }
                w++;
            } else if (curr instanceof XSLOtherwise) {
                conditions[w] = Literal.makeLiteral(BooleanValue.TRUE);
                Expression b = ((XSLOtherwise)curr).compileSequenceConstructor(
                        exec, curr.iterateAxis(Axis.CHILD), true);
                if (b == null) {
                    b = Literal.makeEmptySequence();
                }
                try {
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    * @throws XPathException if the syntax of the expression is wrong, or if it references namespaces,
    * variables, or functions that have not been declared.
    */

    public XPathExpression createExpression(String expression) throws XPathException {
        Expression exp = ExpressionTool.make(expression, staticContext, 0, -1, 1, false);
        exp.setContainer(staticContext);
        ExpressionVisitor visitor = ExpressionVisitor.make(staticContext);
        visitor.setExecutable(getExecutable());
        exp = visitor.typeCheck(exp, Type.ITEM_TYPE);
        exp = visitor.optimize(exp, Type.ITEM_TYPE);
        SlotManager map = staticContext.getStackFrameMap();
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     */

    public Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env) throws XPathException {
        final String uri = functionName.getNamespaceURI();
        if (namespaces.contains(uri)) {
            Expression call = baseLibrary.bind(functionName, staticArgs, env);
            if (call != null) {
                // Check that the result type and all the argument types are in the static context of the
                // calling module
                XQueryFunction def = baseLibrary.getDeclaration(functionName, staticArgs);
                importingModule.checkImportedFunctionSignature(def);
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            } else if (f.equals(StandardNames.USE_CHARACTER_MAPS)) {
                useCharacterMapsAtt = Whitespace.trim(atts.getValue(a));
            } else if (fans.contains(f) || f.startsWith("{")) {
                // this is a serialization attribute
                String val = Whitespace.trim(atts.getValue(a));
                Expression exp = makeAttributeValueTemplate(val);
                serializationAttributes.put(nc&0xfffff, exp);
          } else {
            checkUnknownAttribute(nc);
          }
        }
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Related Classes of net.sf.saxon.expr.Expression

  • net.sf.saxon.event.SequenceReceiver
  • net.sf.saxon.evpull.EventIteratorOverSequence
  • net.sf.saxon.evpull.SingletonEventIterator
  • net.sf.saxon.functions.Document
  • net.sf.saxon.functions.FunctionLibraryList
  • net.sf.saxon.functions.Idref
  • net.sf.saxon.functions.Matches
  • net.sf.saxon.functions.Remove
  • net.sf.saxon.functions.Replace
  • net.sf.saxon.functions.StringJoin
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