Examples of javax.el.ValueExpression

javax.el.ValueExpression
An Expression that can get or set a value. In previous incarnations of this API, expressions could only be read. ValueExpression objects can now be used both to retrieve a value and to set a value. Expressions that can have a value set on them are referred to as l-value expressions. Those that cannot are referred to as r-value expressions. Not all r-value expressions can be used as l-value expressions (e.g. "${1+1}" or "${firstName} ${lastName}"). See the EL Specification for details. Expressions that cannot be used as l-values must always return true from isReadOnly(). The {@link ExpressionFactory#createValueExpression(ELContext,String,Class)}method can be used to parse an expression string and return a concrete instance of ValueExpression that encapsulates the parsed expression. The {@link FunctionMapper} is used atparse time, not evaluation time, so one is not needed to evaluate an expression using this class. However, the {@link ELContext} is needed at evaluation time. The {@link #getValue(ELContext)}, {@link #setValue(ELContext,Object)}, {@link #isReadOnly(ELContext)} and{@link #getType(ELContext)} methods will evaluate the expression each time they are called. The{@link ELResolver} in the ELContext is used to resolve the top-level variables and to determinethe behavior of the . and [] operators. For any of the four methods, the {@link ELResolver#getValue(ELContext,Object,Object)} method is used to resolve all propertiesup to but excluding the last one. This provides the base object. At the last resolution, the ValueExpression will call the corresponding {@link ELResolver#getValue(ELContext,Object,Object)}, {@link ELResolver#setValue(ELContext,Object,Object,Object)}, {@link ELResolver#isReadOnly(ELContext,Object,Object)} or{@link ELResolver#getType(ELContext,Object,Object)} method, depending on which was called onthe ValueExpression. See the notes about comparison, serialization and immutability in the {@link Expression} javadocs. @see ELResolver @see Expression @see ExpressionFactory

     * @param property
     * @return
     */
    protected Object getValueReference(FacesContext context, Object property) {
        if (property instanceof ValueExpression) {
            ValueExpression value = (ValueExpression) property;


            return value.getValue(context.getELContext());
        }


        return property;
    }

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    }


    @Override
    protected Object getValueExpressionValue(String name) {
        Object retVal = null;
        ValueExpression ve = behavior.getValueExpression(name);
        if (ve != null) {
            retVal = ve.getValue(FacesContext.getCurrentInstance().getELContext());
        }
        return retVal;
    }

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            super(propertyDescriptor, dependency);
        }


        private Object getExpressionValue(FacesContext context, String expressionString, Class<?> expectedType) {
            ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
            ValueExpression expression = expressionFactory.createValueExpression(context.getELContext(), expressionString,
                expectedType);
            return expression.getValue(context.getELContext());
        }

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            converter = ((ValueHolder) component).getConverter();
        }


        if (converter == null) {


            ValueExpression ve = component.getValueExpression(property);


            if (ve != null) {


                Class<?> valueType = ve.getType(facesContext.getELContext());
                if (valueType == null || Object.class.equals(valueType)) {
                    // No converter needed
                } else {
                    converter = facesContext.getApplication().createConverter(valueType);
                }

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        if (holder == null) {
            ConfigurationItemsBundle configurationItemsBundle = getConfigurationItemsBundle(key);


            if (configurationItemsBundle == null) {
                ConfigurationItem item = getConfigurationItem(key);
                ValueExpression expression = createContextValueExpression(facesContext, item, returnType);
                holder = createValueExpressionHolder(facesContext, expression, item.defaultValue(), returnType);
                itemsMap.put(key, holder);
            } else {
                synchronized (key.getClass()) {
                    Properties properties = loadProperties(configurationItemsBundle.propertiesFile());


                    Iterator<? extends Enum> keys = EnumSet.allOf(key.getClass()).iterator();
                    while (keys.hasNext()) {
                        Enum<?> nextBundleKey = (Enum<?>) keys.next();


                        ConfigurationItem item = getConfigurationItem(nextBundleKey);


                        if (item.source() != ConfigurationItemSource.defaultSource) {
                            throw new IllegalArgumentException(item.toString());
                        }


                        String parameterValue = null;


                        for (String propertyName : item.names()) {
                            parameterValue = properties.getProperty(propertyName);


                            if (parameterValue != null) {
                                break;
                            }
                        }


                        ValueExpression expression = null;


                        if (parameterValue != null) {
                            expression = ELUtils.createValueExpression(facesContext, parameterValue, item.literal(), returnType);
                        }

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        for (FilterField filterField : state.getFilterFields()) {
            Filter filter = filterField.getFilter();
            if (filter != null && !filter.accept(object)) {
                return false;
            } else {
                ValueExpression filterExpression = filterField.getFilterExpression();
                if (filterExpression != null) {
                    updateVar(context, filterVar, filterField.getFilterValue());
                    if (Boolean.FALSE.equals(filterExpression.getValue(context.getELContext()))) {
                        return false;
                    }
                }
            }
        }

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            if (sortOrder != null && !SortOrder.unsorted.equals(sortOrder)) {
                Comparator comparator = sortField.getComparator();
                if (comparator != null) {
                    result = comparator.compare(object1, object2);
                } else {
                    ValueExpression sortBy = sortField.getSortBy();
                    if (sortBy != null) {
                        updateVar(context, var, object1);
                        Object value1 = sortBy.getValue(context.getELContext());
                        updateVar(context, var, object2);
                        Object value2 = sortBy.getValue(context.getELContext());
                        result = compareSortByValues(context, value1, value2);
                    }
                }
                if (SortOrder.descending.equals(sortOrder)) {
                    result = -result;

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    @SuppressWarnings("unchecked") // Forced cast on T
    @Override
    public <T> T evaluateExpressionGet(FacesContext context, String expression, Class<? extends T> expectedType)
            throws ELException {
        ValueExpression ve = getExpressionFactory().createValueExpression(context.getELContext(), expression, expectedType);
        return (T) (ve.getValue(context.getELContext()));
    }

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    public DataComponentState getComponentState() {
        if (componentState != null) {
            return componentState;
        }


        ValueExpression componentStateExpression = getValueExpression("componentState");


        if (componentStateExpression != null) {
            componentState = (DataComponentState) componentStateExpression.getValue(getFacesContext().getELContext());
        }


        if (componentState == null) {
            componentState = createComponentState();


            if ((componentStateExpression != null) && !componentStateExpression.isReadOnly(getFacesContext().getELContext())) {
                componentStateExpression.setValue(getFacesContext().getELContext(), componentState);
            }
        }


        return componentState;
    }

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        facesEnvironment.release();
    }


    @Test
    public void testGetDescriptionPositive() throws Exception {
        ValueExpression expression = parse("#{bean.string}");
        recordFacesContextExpectations();
        ValueDescriptor propertyDescriptor = analayser.getPropertyDescriptor(facesContext, expression);
        assertEquals(Bean.class, propertyDescriptor.getBeanType());
        assertEquals("string", propertyDescriptor.getName());
        FacesMock.verify(facesEnvironment);

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