Examples of org.apache.commons.jxpath.CompiledExpression

org.apache.commons.jxpath.CompiledExpression
Represents a compiled XPath. The interpretation of compiled XPaths may be faster, because it bypasses the compilation step. The reference implementation of JXPathContext also globally caches some of the results of compilation, so the direct use of JXPathContext is not always less efficient than the use of CompiledExpression.
Use CompiledExpression only when there is a need to evaluate the same expression multiple times and the CompiledExpression can be conveniently cached.
To acqure a CompiledExpression, call {@link JXPathContext#compile JXPathContext.compile} @author Dmitri Plotnikov @version $Revision: 1.4 $ $Date: 2003/03/11 00:59:11 $

                                      startElement.raw,
                                      startElement.attributes);


            } else if (ev instanceof StartRepeat) {
                StartRepeat startRepeat = (StartRepeat)ev;
                final CompiledExpression nodeset = startRepeat.nodeset;
                Iterator iter = null;
                try {
                    if (nodeset == null) {
                        iter = NULL_ITER;
                    } else {
                        iter = 
                            nodeset.iteratePointers(jxpathContext);
                    }
                } catch (Exception exc) {
                    throw new SAXParseException(exc.getMessage(),
                                                ev.location,
                                                exc);
                } catch (Error err) {
                    throw new SAXParseException(err.getMessage(),
                                                ev.location,
                                                null);
                }
                while (iter.hasNext()) {
                    Object value;
                    Pointer ptr = (Pointer)iter.next();
                    try {
                        value = ptr.getNode();
                    } catch (Exception exc) {
                        throw new SAXParseException(exc.getMessage(),
                                                        ev.location,
                                                        exc);
                    }
                    JXPathContext localJXPathContext = 
                        jxpathContextFactory.newContext(null, value);
                    String path = "";
                    if (contextPath != null) {
                        path = contextPath + "/."; 
                    } 
                    path += ptr.asPath();
                    execute(consumer,
                            form,
                            currentView,
                            path,
                            localJXPathContext,
                            startRepeat.next,
                            startRepeat.endRepeat);
                }
                ev = startRepeat.endRepeat.next;
                continue;
            } else if (ev instanceof StartGroup) {
                StartGroup startGroup = (StartGroup)ev;
                StartElement startElement = startGroup.startElement;
                consumer.startElement(startElement.namespaceURI,
                                      startElement.localName,
                                      startElement.raw,
                                      startElement.attributes);
                final CompiledExpression ref = startGroup.ref;
                if (ref != null) {
                    Object value;
                    try {
                        value = ref.getValue(jxpathContext);
                    } catch (Exception exc) {
                        throw new SAXParseException(exc.getMessage(),
                                                    ev.location,
                                                    exc);
                    }
                    JXPathContext localJXPathContext = 
                        jxpathContextFactory.newContext(null, value);
                    String path = "";
                    if (contextPath != null) {
                        path = contextPath + "/.";
                    } 
                    path += startElement.attributes.getValue(REF);
                    execute(consumer,
                            form,
                            currentView,
                            path,
                            localJXPathContext,
                            startGroup.next,
                            startGroup.endGroup);
                    ev = startGroup.endGroup;
                    continue;
                }
            } else if (ev instanceof StartItemSet) {
                StartItemSet startItemSet = (StartItemSet)ev;
                final CompiledExpression nodeset = startItemSet.nodeset;
                Iterator iter = null;
                try {
                    if (nodeset == null) {
                        iter = NULL_ITER;
                    } else {
                        iter = 
                            nodeset.iteratePointers(jxpathContext);
                    }
                } catch (Exception exc) {
                    throw new SAXParseException(exc.getMessage(),
                                                ev.location,
                                                exc);
                } catch (Error err) {
                    throw new SAXParseException(err.getMessage(),
                                                ev.location,
                                                null);
                }
                while (iter.hasNext()) {
                    Object value;
                    Pointer ptr = (Pointer)iter.next();
                    try {
                        value = ptr.getNode();
                    } catch (Exception exc) {
                        throw new SAXParseException(exc.getMessage(),
                                                        ev.location,
                                                        exc);
                    }
                    JXPathContext localJXPathContext = 
                        jxpathContextFactory.newContext(null, value);
                    AttributesImpl attrs = new AttributesImpl();
                    attrs.addAttribute(NS, "ref", "ref", "CDATA",
                                       ptr.asPath());
                    consumer.startElement(NS, "item", "item",
                                          attrs);
                    String path = "";
                    if (contextPath != null) {
                        path = contextPath + "/.";
                    } 
                    path += ptr.asPath();
                    execute(consumer,
                            form,
                            currentView,
                            ptr.asPath(),
                            localJXPathContext,
                            startItemSet.next,
                            startItemSet.endItemSet);
                    consumer.endElement(NS, "item", "item");
                }
                ev = startItemSet.endItemSet.next;
                continue;
            } else if (ev instanceof StartInputControl) {
                //
                // input, textarea, secret, select1, selectMany
                //
                StartInputControl startInputControl =
                    (StartInputControl)ev;
                CompiledExpression ref = startInputControl.ref;
                StartElement startElement = startInputControl.startElement;
                String refStr = startElement.attributes.getValue("ref");
                consumer.startElement(startElement.namespaceURI,
                                      startElement.localName,
                                      startElement.raw,
                                      startElement.attributes);
                if (ref != null) {
                    Iterator iter = ref.iteratePointers(jxpathContext);
                    while (iter.hasNext()) {
                        Pointer ptr = (Pointer)iter.next();
                        AttributesImpl attrs = new AttributesImpl();
                        attrs.addAttribute(NS, REF, REF, "CDATA",
                                           ptr.asPath());

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            throws SAXException {
            Event newEvent = null;
            if (NS.equals(namespaceURI)) {
                if (localName.equals(REPEAT)) {
                    String items = attrs.getValue(NODESET);
                    CompiledExpression expr =
                        compileExpr(items, locator);
                    StartRepeat startRepeat = 
                        new StartRepeat(locator, namespaceURI,
                                        localName, raw, attrs, expr);
                    newEvent = startRepeat;
                } else if (localName.equals(ITEMSET)) {
                    String items = attrs.getValue(NODESET);
                    CompiledExpression expr =
                        compileExpr(items, locator);
                    StartItemSet startItemSet =
                        new StartItemSet(locator, namespaceURI,
                                         localName, raw, attrs, expr);
                    newEvent = startItemSet;
                } else if (isReadonlyInputControl(localName)) {
                    String refStr = attrs.getValue("ref");
                    CompiledExpression ref = 
                        compileExpr(refStr, locator);
                    StartReadonlyInputControl startInputControl = 
                        new StartReadonlyInputControl(locator,
                                                      ref,
                                                      new StartElement(locator,
                                                                       namespaceURI, localName, raw, attrs));
                    newEvent = startInputControl;
                } else if (isInputControl(localName)) {
                    String refStr = attrs.getValue("ref");
                    CompiledExpression ref = 
                        compileExpr(refStr, locator);
                    StartInputControl startInputControl = 
                        new StartInputControl(locator,
                                              ref,
                                              new StartElement(locator, namespaceURI, 
                                                               localName, raw, attrs));
                    newEvent = startInputControl;
                } else if (SUBMIT.equals(localName)) {
                    StartSubmit startSubmit = 
                        new StartSubmit(locator,
                                        new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startSubmit;
                } else if (ITEM.equals(localName)) {
                    StartItem startItem = 
                        new StartItem(locator,
                                        new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startItem;
                } else if (CHOICES.equals(localName)) {
                    StartChoices startChoices = 
                        new StartChoices(locator,
                                        new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startChoices;
                } else if (VALUE.equals(localName)) {
                    StartValue startValue = 
                        new StartValue(locator,
                                        new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startValue;
                } else if (OUTPUT.equals(localName)) {
                    String refStr = attrs.getValue(REF);
                    String valueStr = attrs.getValue(VALUE);
                    if (refStr != null && valueStr != null) {
                        throw new SAXParseException("ref and value are mutually exclusive", locator, null);
                    }
                    CompiledExpression ref = compileExpr(refStr, 
                                                         locator);
                    CompiledExpression value = compileExpr(valueStr, 
                                                           locator);
                    StartOutput startOutput = 
                        new StartOutput(locator,
                                        ref, value,
                                        new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startOutput;
                } else if (FORM.equals(localName)) {
                    StartForm startForm = 
                        new StartForm(locator,
                                      new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startForm;
                } else if (VIOLATIONS.equals(localName)) {
                    StartViolations startViolations = 
                        new StartViolations(locator,
                                            (Event)stack.peek(),
                                            new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startViolations;
                } else if (GROUP.equals(localName)) {
                    String refStr = attrs.getValue(REF);
                    CompiledExpression ref = 
                        compileExpr(refStr, locator);
                    StartGroup startGroup = 
                        new StartGroup(locator,
                                       ref,
                                       new StartElement(locator, namespaceURI, localName, raw, attrs));
                    newEvent = startGroup;
                } else if (HIDDEN.equals(localName)) {
                    String refStr = attrs.getValue(REF);
                    CompiledExpression ref = 
                        compileExpr(refStr, locator);
                    StartHidden startHidden = 
                        new StartHidden(locator,
                                       ref,
                                       new StartElement(locator, namespaceURI, localName, raw, attrs));

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        compileExpr(String expr, Locator location) 
        throws SAXParseException {
        if (expr == null) return null;
        expr = expr.trim();
        try {
            CompiledExpression jxpath = JXPathContext.compile(expr);
            return new XPathExpr(expr, jxpath, expr.startsWith("/"));
        } catch (Exception exc) {
            throw new SAXParseException(exc.getMessage(),
                                        location, exc);
        } catch (Error err) {

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            for (int j = 0; j < xPathChildren.length; j++) {
                Configuration xPathChild = xPathChildren[j];


                String xPathName = xPathChild.getAttribute("name");
                CompiledExpression xPath = JXPathContext.compile(xPathChild.getAttribute("test"));


                xPathMap.put(xPathName, xPath);
            }
            if (xPathMap.size() > 0) {
                // store xpath - config if there is some

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        throws Exception {
        if (expr != null) {
            Object compiled = expr.compiledExpression;
            try {
                if (compiled instanceof CompiledExpression) {
                    CompiledExpression e = (CompiledExpression)compiled;
                    boolean oldLenient = jxpathContext.isLenient();
                    if (lenient != null) {
                        jxpathContext.setLenient(lenient.booleanValue());
                    }
                    try {
                        return e.getValue(jxpathContext);
                    } finally {
                        jxpathContext.setLenient(oldLenient);
                    }
                } else if (compiled instanceof org.apache.commons.jexl.Expression) {
                    org.apache.commons.jexl.Expression e =
                        (org.apache.commons.jexl.Expression)compiled;
                    return e.evaluate(jexlContext);
                }
                return compiled;
            } catch (InvocationTargetException e) {
                Throwable t = e.getTargetException();
                if (t instanceof Exception) {
                    throw (Exception)t;
                }
                throw (Error)t;
            }

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                           JXPathContext jxpathContext, Boolean lenient)
        throws Exception {
        try {
            Object compiled = expr.compiledExpression;
            if (compiled instanceof CompiledExpression) {
                CompiledExpression e = (CompiledExpression)compiled;
                boolean oldLenient = jxpathContext.isLenient();
                if (lenient != null) jxpathContext.setLenient(lenient.booleanValue());
                try {
                    Iterator iter = 
                        e.iteratePointers(jxpathContext);
                    if (!iter.hasNext()) {
                        return null;
                    }
                    Pointer first = (Pointer)iter.next();
                    if (!iter.hasNext()) {
                        return first.getNode();
                    }
                    List result = new LinkedList();
                    result.add(first.getNode());
                    boolean dom = (first.getNode() instanceof Node);
                    while (iter.hasNext()) {
                        Object obj = ((Pointer)iter.next()).getNode();
                        dom = dom && (obj instanceof Node);
                        result.add(obj);
                    }
                    Object[] arr;
                    if (dom) {
                        arr = new Node[result.size()];
                    } else {
                        arr = new Object[result.size()];
                    }
                    result.toArray(arr);
                    return arr;
                } finally {
                    jxpathContext.setLenient(oldLenient);
                }
            } else if (compiled instanceof org.apache.commons.jexl.Expression) {
                org.apache.commons.jexl.Expression e =
                    (org.apache.commons.jexl.Expression)compiled;
                return e.evaluate(jexlContext);
            }
            return expr.raw;
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof Exception) {
                throw (Exception)t;
            }
            throw (Error)t;
        }

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                String var, varStatus;
                try {
                    if (items != null) {
                        Expression expr = (Expression)items;
                        if (expr.compiledExpression instanceof CompiledExpression) {
                            CompiledExpression compiledExpression =
                                (CompiledExpression)expr.compiledExpression;
                            Object val =
                                compiledExpression.getPointer(jxpathContext,
                                                              expr.raw).getNode();
                            // FIXME: workaround for JXPath bug
                            if (val instanceof NativeArray) {
                                iter = new JSIntrospector.NativeArrayIterator((NativeArray)val);
                            } else {
                                iter = compiledExpression.iteratePointers(jxpathContext);
                            }
                        } else if (expr.compiledExpression instanceof org.apache.commons.jexl.Expression) {
                            org.apache.commons.jexl.Expression e =
                                (org.apache.commons.jexl.Expression)expr.compiledExpression;
                            Object result = e.evaluate(jexlContext);

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            for (int j = 0; j<xPathChildren.length; j++) {
                Configuration xPathChild = xPathChildren[j];


                String xPathName = xPathChild.getAttribute("name");
                CompiledExpression xPath = JXPathContext.compile(xPathChild.getAttribute("test"));


                xPathMap.put(xPath, xPathName);
            }
            if (xPathMap.size()>0) {
                // store xpath - config if there is some

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        compileExpr(String expr, Locator location) 
        throws SAXParseException {
        if (expr == null) return null;
        expr = expr.trim();
        try {
            CompiledExpression jxpath = JXPathContext.compile(expr);
            return new XPathExpr(expr, jxpath, expr.startsWith("/"));
        } catch (Exception exc) {
            throw new SAXParseException(exc.getMessage(),
                                        location, exc);
        } catch (Error err) {

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                                JXPathContext jxpathContext, Boolean lenient) throws Exception {
        if (expr != null) {
            Object compiled = expr.compiledExpression;
            try {
                if (compiled instanceof CompiledExpression) {
                    CompiledExpression e = (CompiledExpression)compiled;
                    boolean oldLenient = jxpathContext.isLenient();
                    if (lenient != null) {
                        jxpathContext.setLenient(lenient.booleanValue());
                    }
                    try {
                        return e.getValue(jxpathContext);
                    } finally {
                        jxpathContext.setLenient(oldLenient);
                    }
                } else if (compiled instanceof Expression) {
                    Expression e = (Expression)compiled;
                    return e.evaluate(jexlContext);
                }
                return compiled;
            } catch (InvocationTargetException e) {
                Throwable t = e.getTargetException();
                if (t instanceof Exception) {
                    throw (Exception)t;
                }
                throw (Error)t;
            }

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