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


        if (!isValid() || !isLocalValueSet()) {
            return;
        }


        ValueExpression ve = getValueExpression("value");
        if (ve == null) {
            return;
        }


        Throwable caught = null;
        FacesMessage message = null;
        try {
            ve.setValue(facesContext.getELContext(), getLocalValue());
            setValue(null);
            setLocalValueSet(false);
        } catch (ELException e) {
            caught = e;
            String messageStr = e.getMessage();

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        @SuppressWarnings("unchecked")
        Collection<Object> selection = (Collection<Object>) getStateHelper().eval(PropertyKeys.selection);
        if (selection == null) {
            selection = new HashSet<Object>();


            ValueExpression ve = getValueExpression(PropertyKeys.selection.toString());
            if (ve != null) {
                ve.setValue(getFacesContext().getELContext(), selection);
            } else {
                getStateHelper().put(PropertyKeys.selection, selection);
            }
        }

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            AbstractTreeNode treeNodeComponent = findTreeNodeComponent();


            boolean newExpandedValue = toggleEvent.isExpanded();


            FacesContext context = getFacesContext();
            ValueExpression expression = treeNodeComponent
                    .getValueExpression(AbstractTreeNode.PropertyKeys.expanded.toString());
            if (expression != null) {
                ELContext elContext = context.getELContext();
                Exception caught = null;
                FacesMessage message = null;
                try {
                    expression.setValue(elContext, newExpandedValue);
                } catch (ELException e) {
                    caught = e;
                    String messageStr = e.getMessage();
                    Throwable result = e.getCause();
                    while (null != result && result.getClass().isAssignableFrom(ELException.class)) {

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            MethodExpression listenerMethodExpression = this.listenerMethod.getMethodExpression(ctx, Void.TYPE,
                new Class<?>[] { ActionEvent.class });


            as.addActionListener(new MethodExpressionActionListener(listenerMethodExpression));
        } else {
            ValueExpression b = null;
            if (this.binding != null) {
                b = this.binding.getValueExpression(ctx, ActionListener.class);
            }
            ActionListener listener = new LazyActionListener(this.listenerType, b);
            as.addActionListener(listener);

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    public void validate(FacesContext context, UIComponent component, Object convertedValue) throws ValidatorException {
        if (component instanceof EditableValueHolder) {
            // Validate input component
            EditableValueHolder input = (EditableValueHolder) component;
            try {
                ValueExpression valueExpression = component.getValueExpression("value");
                if (null != valueExpression) {
                    BeanValidatorService validatorService = ServiceTracker.getService(BeanValidatorService.class);
                    Collection<String> messages = validatorService.validateExpression(context, valueExpression, convertedValue,
                        getGroups());
                    if (isValidateFields() && !messages.isEmpty()) {

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    public PanelToggleListenerHandler(TagConfig config) {
        super(config);
    }


    public void applyAttachedObject(FacesContext context, UIComponent parent) {
        ValueExpression expression = null;
        if (this.binding != null) {
            FaceletContext ctx = (FaceletContext) context.getAttributes().get(TagHandlerUtils.FACELET_CONTEXT_KEY);
            expression = this.binding.getValueExpression(ctx, PanelToggleListener.class);
        }

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     * @return value expression from string and stores expression's expected type
     */
    public static ValueExpression createValueExpression(FacesContext context, String expression, boolean literal,
            Class<?> expectedType) {


        ValueExpression result = null;


        if (!literal && ELUtils.isValueReference(expression)) {
            ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();


            if (expressionFactory == null) {

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    }


    public Validator createChildrenValidator() {
        FacesBeanValidator validator = (FacesBeanValidator) getFacesContext().getApplication().createValidator(getType());
        validator.setSummary(getSummary());
        ValueExpression expression = getValueExpression("groups");
        if (null != expression) {
            validator.setGroups(expression);
        } else {
            validator.setGroups(getGroups());
        }

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    public ItemChangeListenerHandler(TagConfig config) {
        super(config);
    }


    public void applyAttachedObject(FacesContext context, UIComponent parent) {
        ValueExpression valueExpr = null;
        if (this.binding != null) {
            FaceletContext ctx = (FaceletContext) context.getAttributes().get(TagHandlerUtils.FACELET_CONTEXT_KEY);
            valueExpr = this.binding.getValueExpression(ctx, ItemChangeListener.class);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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