Package net.sf.saxon.expr

Examples of net.sf.saxon.expr.Expression

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    public Expression compile(Executable exec) throws XPathException {

        DocumentInstr inst = new DocumentInstr(false, null, getBaseURI());
        inst.setValidationAction(validationAction);
        inst.setSchemaType(schemaType);
        Expression b = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
        if (b == null) {
            b = Literal.makeEmptySequence();
        }
        inst.setContentExpression(b);
        return inst;
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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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        }
    }


    public Expression optimize(ExpressionVisitor visitor, ItemType contextItemType) throws XPathException {
        Expression exp = super.optimize(visitor, contextItemType);
        if (exp == this) {
            if (contextItemType.isAtomicType()) {
                return new ContextItemExpression();
            }
        }
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    public void validate() throws XPathException {
        //checkWithinTemplate();
    }

    public Expression compile(Executable exec) throws XPathException {
        Expression content = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
        if (content == null) {
            content = Literal.makeEmptySequence();
        }
        Doctype inst = new Doctype(content);
        return inst;
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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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        select = typeCheck("select", select);
    }

    public Expression compile(Executable exec) throws XPathException {
        SortKeyDefinition[] sortKeys = makeSortKeys();
        Expression sortedSequence = select;
        if (sortKeys != null) {
            sortedSequence = new SortExpression(select, sortKeys);
        }

        Expression block = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
        if (block == null) {
            // body of for-each is empty: it's a no-op.
            return Literal.makeEmptySequence();
        }
        try {
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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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    public Expression compile(Executable exec) throws XPathException {
        SortKeyDefinition[] sortKeys = makeSortKeys();
        if (select != null) {
            return new SortExpression(select, sortKeys);
        } else {
            Expression body = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);
            if (body == null) {
                body = Literal.makeEmptySequence();
            }
            try {
                return new SortExpression(makeExpressionVisitor().simplify(body), sortKeys);
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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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