Examples of javax.el.ExpressionFactory

javax.el.ExpressionFactory
Parses a String into a {@link ValueExpression} or {@link MethodExpression} instance for laterevaluation. Classes that implement the EL expression language expose their functionality via this abstract class. There is no concrete implementation of this API available in this package. Technologies such as JavaServer Pages and JavaServer Faces provide access to an implementation via factory methods. The {@link #createValueExpression(ELContext,String,Class)} method is usedto parse expressions that evaluate to values (both l-values and r-values are supported). The {@link #createMethodExpression(ELContext,String,Class,Class[])} method is used to parseexpressions that evaluate to a reference to a method on an object. Unlike previous incarnations of this API, there is no way to parse and evaluate an expression in one single step. The expression needs to first be parsed, and then evaluated. Resolution of model objects is performed at evaluation time, via the {@link ELResolver} associated with the {@link ELContext} passed tothe ValueExpression or MethodExpression. The ELContext object also provides access to the {@link FunctionMapper} and {@link VariableMapper} to be used when parsing the expression. ELfunction and variable mapping is performed at parse-time, and the results are bound to the expression. Therefore, the {@link ELContext}, {@link FunctionMapper}, and {@link VariableMapper}are not stored for future use and do not have to be Serializable. The createValueExpression and createMethodExpression methods must be thread-safe. That is, multiple threads may call these methods on the same ExpressionFactory object simultaneously. Implementations should synchronize access if they depend on transient state. Implementations should not, however, assume that only one object of each ExpressionFactory type will be instantiated; global caching should therefore be static. The ExpressionFactory must be able to handle the following types of input for the expression parameter:
- Single expressions using the ${} delimiter (e.g. "${employee.lastName}").
- Single expressions using the #{} delimiter (e.g. "#{employee.lastName}").
- Literal text containing no ${} or #{} delimiters (e.g. "John Doe").
- Multiple expressions using the same delimiter (e.g.
- Mixed literal text and expressions using the same delimiter (e.g. "Name: ${employee.firstName} ${employee.lastName}").
The following types of input are illegal and must cause an {@link ELException} to be thrown:
- Multiple expressions using different delimiters (e.g. "${employee.firstName}#{employee.lastName}").
- Mixed literal text and expressions using different delimiters(e.g. "Name: ${employee.firstName} #{employee.lastName}").

     *            expected return type
     * @return ValueExpression instance
     */
    public ValueExpression getValueExpression(FaceletContext ctx, Class type) {
        try {
            ExpressionFactory f = ctx.getExpressionFactory();
            return new TagValueExpression(this, f.createValueExpression(ctx,
                    this.value, type));
        } catch (Exception e) {
            throw new TagAttributeException(this, e);
        }
    }

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            this.decorators.add(decorator);
        }
    }


    public final ExpressionFactory createExpressionFactory() {
        ExpressionFactory el = null;
        el = (ExpressionFactory) this.featureInstance(EXPRESSION_FACTORY);
        if (el == null && FacesAPI.getVersion() >= 12) {
            try {
                el = FacesContext.getCurrentInstance().getApplication()
                        .getExpressionFactory();

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                                          Class expectedType ) {


        JspFactory jspFactory = JspFactory.getDefaultFactory();
        JspApplicationContext jspAppContext =
            jspFactory.getJspApplicationContext(pageContext.getServletContext());
        ExpressionFactory exprFactory = jspAppContext.getExpressionFactory();
        return exprFactory.coerceToType(value, expectedType);
    }

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        if (component == null) { // PENDING - i18n
            throw new JspException("No component associated with UIComponentTag");
        }


        FacesContext context = FacesContext.getCurrentInstance();
        ExpressionFactory exprFactory =
            context.getApplication().getExpressionFactory();
        ELContext elContext = context.getELContext();


        String nameVal = (String) 
                  exprFactory.createValueExpression(elContext, name, String.class)
                      .getValue(elContext);
        Object valueVal =
                exprFactory.createValueExpression(elContext, value, Object.class)
                    .getValue(elContext);


        if (component.getAttributes().get(nameVal) == null) {
            component.getAttributes().put(nameVal, valueVal);
        }

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                                            Object value,
                                            Class toType) {


        Object newValue;
        try {
            ExpressionFactory ef = ctx.getApplication().getExpressionFactory();
            newValue = ef.coerceToType(value, toType);
        } catch (ELException ele) {
            newValue = value;
        } catch (IllegalArgumentException iae) {
            // If coerceToType fails, per the docs it should throw
            // an ELException, however, GF 9.0 and 9.0u1 will throw

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        if (elFactoryType == null) {
            return false;
        }
        try {
            ExpressionFactory factory = (ExpressionFactory)
                    Util.loadClass(elFactoryType, this).newInstance();
            ApplicationAssociate associate =
                    ApplicationAssociate.getInstance(sc);
            if (associate != null) {
                associate.setExpressionFactory(factory);

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                List<Class> paramTypes = Collections.emptyList();
                if (0 < params.getLength()) {
                    paramTypes = new ArrayList<Class>();
                    List<Parameter> paramList = new ArrayList<Parameter>();
                    Parameter toAdd = null;
                    ExpressionFactory ef = context.getApplication().getExpressionFactory();
                    ELContext elContext = context.getELContext();
                    ValueExpression ve = null;
                    
                    for (int i_param = 0; i_param < params.getLength(); i_param++) {
                        Node param = params.item(i_param);
                        NodeList valueList = (NodeList) 
                                xpath.evaluate(".//ns1:value/text()", param, XPathConstants.NODESET);
                        if (null == valueList || 1 != valueList.getLength()) {
                            throw new XPathExpressionException("Within <parameter> exactly one <value> child is allowed");
                        }
                        String valueStr = valueList.item(0).getNodeValue().trim();
                        String classStr = null;
                        
                        NodeList classList = (NodeList) 
                                xpath.evaluate(".//ns1:class/text()", param, XPathConstants.NODESET);
                        if (null != classList && 1 < classList.getLength()) {
                            throw new XPathExpressionException("Within <parameter> at most one <class> child is allowed");
                        }
                        if (null != classList && 1 == classList.getLength()) {
                            classStr = classList.item(0).getNodeValue().trim();
                        }
                        Class clazz = String.class; 
                        if (null != classStr) {
                            try {
                                clazz = ReflectionUtil.forName(classStr);
                            } catch (ClassNotFoundException e) {
                                clazz = Object.class;
                            }
                        }
                        
                        ve = ef.createValueExpression(elContext, valueStr, clazz);
                        toAdd = new ParameterImpl(classStr, ve);
                        paramList.add(toAdd);
                        paramTypes.add(clazz);
                    }
                    methodCallBuilder.parameters(paramList);

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    {
        if (value == null) return null;


        try
        {
            ExpressionFactory expFactory = facesContext.getApplication().getExpressionFactory();
            // Use coersion implemented by JSP EL for consistency with EL
            // expressions. Additionally, it caches some of the coersions.
            return (T)expFactory.coerceToType(value, desiredClass);
        }
        catch (ELException e)
        {
            String message = "Cannot coerce " + value.getClass().getName()
                    + " to " + desiredClass.getName();

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        Class<?> valueClass = (mapEntries.getValueClass() == null)
                ? String.class : ClassUtils.simpleJavaTypeToClass(mapEntries.getValueClass());
        
        ValueExpression valueExpression;
        ExpressionFactory expFactory = application.getExpressionFactory();
        ELContext elContext = facesContext.getELContext();


        for (Iterator<? extends MapEntry> iterator = mapEntries.getMapEntries(); iterator.hasNext();)
        {
            MapEntry entry = iterator.next();
            Object key = entry.getKey();


            if (ContainerUtils.isValueReference((String) key))
            {
                valueExpression = expFactory.createValueExpression(elContext, (String) key, Object.class);
                key = valueExpression.getValue(elContext);
            }


            if (entry.isNullValue())
            {
                map.put(coerceToType(facesContext, key, keyClass), null);
            }
            else
            {
                Object value = entry.getValue();
                if (ContainerUtils.isValueReference((String) value))
                {
                    valueExpression = expFactory.createValueExpression(elContext, (String) value, Object.class);
                    value = valueExpression.getValue(elContext);
                }
                
                map.put(coerceToType(facesContext, key, keyClass), coerceToType(facesContext, value, valueClass));
            }

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        Application application = facesContext.getApplication();
        
        Class<?> valueClass = (listEntries.getValueClass() == null)
                ? String.class : ClassUtils.simpleJavaTypeToClass(listEntries.getValueClass());
        
        ExpressionFactory expFactory = application.getExpressionFactory();
        ELContext elContext = facesContext.getELContext();


        for (Iterator<? extends ListEntry> iterator = listEntries.getListEntries(); iterator.hasNext();)
        {
            ListEntry entry = iterator.next();
            if (entry.isNullValue())
            {
                list.add(null);
            }
            else
            {
                Object value = entry.getValue();
                if (ContainerUtils.isValueReference((String) value))
                {
                    ValueExpression valueExpression = expFactory.createValueExpression(elContext, (String) value, Object.class);
                    value = valueExpression.getValue(elContext);
                }
                
                list.add(coerceToType(facesContext, value, valueClass));
            }

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