Example usage for javax.el ValueExpression getValue

Introduction

In this page you can find the example usage for javax.el ValueExpression getValue.

Prototype

public abstract Object getValue(ELContext context);

Source Link

Usage

From source file:eu.eubrazilcc.lvl.storage.security.el.PermissionElBuilder.java

/**
 * Builds a permission expression from a template compatible with EL (expression language). The following are valid examples of
 * permission templates which includes at least one property from {@link User}, considering the userid <tt>username</tt> and 
 * the provider <tt>lvl</tt>:
 * <ul>/*from   ww w. j  a  v a  2  s . co  m*/
 * <li><tt>level1:${user.userid}:level3</tt> - builds to: <tt>level1:username:level3</tt></li>
 * <li><tt>level1:${user.userid}@${user.provider}</tt> - builds to: <tt>level1:username@lvl</tt></li>
 * <li><tt>${user.userid}:${user.userid}@${user.provider}</tt> - <tt>username:username@lvl</tt></li>
 * </ul>
 * @param template - permission template to be parsed and completed with user details
 * @param user - contains the details of the user
 * @return A permission expression where the EL parameters are replaced by the corresponding properties from the specified user.
 */
public static String buildPermission(final String template, final User user) {
    checkNotNull(template, "Uninitialized or invalid permission template");
    checkArgument(user != null && isNotBlank(user.getUserid()) && isNotBlank(user.getProvider()),
            "Uninitialized or invalid user");
    final PermissionElContext ctxt = PermissionElContext.builder().user(user).build();
    final String template2 = template.trim();
    final ValueExpression expr = EXPR_FACTORY.createValueExpression(ctxt, template2, String.class);
    return expr.getValue(ctxt).toString();
}

From source file:com.thruzero.common.jsf.utils.FacesUtils.java

private static Object getExpressionValue(String el, Class<?> cls) {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
    ValueExpression valueExpression = expressionFactory.createValueExpression(facesContext.getELContext(), el,
            cls);//from w  w w .  j  a v  a 2s. c o  m

    Object result = valueExpression.getValue(facesContext.getELContext());

    return result;
}

From source file:org.nuxeo.ecm.platform.ui.web.util.ComponentTagUtils.java

/**
 * Resolves an expression from a given facelet context, using its {@link ExpressionFactory} that can hold a wider
 * context than the faces context behind it.
 * <p>/*from   w  ww.j a v  a  2 s.c  o  m*/
 * Resolves the expression a second time when first resolution gives a String value using the EL Expression syntax.
 * <p>
 * Does not throw any error when resolution fails (only logs an error message).
 */
public static Object resolveElExpression(FaceletContext faceletContext, String elExpression) {
    if (!isValueReference(elExpression)) {
        // literal
        return elExpression;
    } else {
        if (faceletContext == null) {
            log.error("FaceletContext is null => cannot resolve el expression '" + elExpression + "'");
            return null;
        }
        // expression => evaluate
        ExpressionFactory eFactory = faceletContext.getExpressionFactory();
        ELContext elContext = faceletContext.getFacesContext().getELContext();
        ValueExpression expr = eFactory.createValueExpression(faceletContext, elExpression, Object.class);
        try {
            return expr.getValue(elContext);
        } catch (ELException e) {
            log.error("Facelet context: Error processing expression '" + elExpression + "'", e);
            return null;
        }
    }
}

From source file:de.beyondjava.angularFaces.core.ELTools.java

/**
 * Evaluates an EL expression into an object.
 *
 * @param p_expression/*from www .  ja v  a2s .  c  o  m*/
 * @return
 */
public static Object evalAsObject(String p_expression) {
    FacesContext context = FacesContext.getCurrentInstance();
    ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
    ELContext elContext = context.getELContext();
    ValueExpression vex = expressionFactory.createValueExpression(elContext, p_expression, Object.class);
    Object result = vex.getValue(elContext);
    return result;
}

From source file:net.vpc.common.jsf.FacesUtils.java

public static Object evaluateEL(String p_expression) {
    FacesContext context = FacesContext.getCurrentInstance();
    ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
    ELContext elContext = context.getELContext();
    ValueExpression vex = expressionFactory.createValueExpression(elContext, p_expression, String.class);
    return vex.getValue(elContext);
}

From source file:ec.edu.chyc.manejopersonal.managebean.GestorAcuerdoConfidencialidad.java

public static GestorAcuerdoConfidencialidad getInstance() {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ELContext context = facesContext.getELContext();
    ValueExpression ex = facesContext.getApplication().getExpressionFactory().createValueExpression(context,
            "#{gestorAcuerdoConfidencialidad}", GestorAcuerdoConfidencialidad.class);
    return (GestorAcuerdoConfidencialidad) ex.getValue(context);
}

From source file:de.beyondjava.angularFaces.core.ELTools.java

/**
 * Evaluates an EL expression into a string.
 *
 * @param p_expression//www  . j  a  v  a 2  s .  c  o m
 * @return
 */
public static String evalAsString(String p_expression) {
    FacesContext context = FacesContext.getCurrentInstance();
    ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
    ELContext elContext = context.getELContext();
    ValueExpression vex = expressionFactory.createValueExpression(elContext, p_expression, String.class);
    String result = (String) vex.getValue(elContext);
    return result;
}

From source file:ec.edu.chyc.manejopersonal.managebean.GestorContrato.java

public static GestorContrato getInstance() {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ELContext context = facesContext.getELContext();
    ValueExpression ex = facesContext.getApplication().getExpressionFactory().createValueExpression(context,
            "#{gestorContrato}", GestorContrato.class);
    return (GestorContrato) ex.getValue(context);
}

From source file:ec.edu.chyc.manejopersonal.managebean.GestorConvenio.java

public static GestorConvenio getInstance() {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ELContext context = facesContext.getELContext();
    ValueExpression ex = facesContext.getApplication().getExpressionFactory().createValueExpression(context,
            "#{gestorConvenio}", GestorConvenio.class);
    return (GestorConvenio) ex.getValue(context);
}

From source file:org.n52.geolabel.component.GeoLabelComponent.java

/**
 * Marks a specific GEO label service for the current request as broken.
 * Important to not send any further GeoLabel requests in case of an error.
 * /*  w  w  w . j a v  a  2s.  c  o  m*/
 * @param context
 */
private static void setServiceFailed(String endpoint, FacesContext context) {
    ValueExpression expression = context.getApplication().getExpressionFactory().createValueExpression(
            context.getELContext(), "#{geoLabelResourcesBean}", GeoLabelResourcesBean.class);
    GeoLabelResourcesBean resourcesBean = (GeoLabelResourcesBean) expression.getValue(context.getELContext());
    resourcesBean.setGeoLabelServiceFailed(endpoint);
}