Examples of javax.el.ELContext

javax.el.ELContext
Context information for expression evaluation. To evaluate an {@link Expression}, an ELContext must be provided. The ELContext holds:
- a reference to the base {@link ELResolver} that will be consulted to resolve model objectsand their properties
- a reference to {@link FunctionMapper} that will be used to resolve EL Functions.
- a reference to {@link VariableMapper} that will be used to resolve EL Variables.
- a collection of all the relevant context objects for use by ELResolvers
- state information during the evaluation of an expression, such as whether a property has been resolved yet
The collection of context objects is necessary because each ELResolver may need access to a different context object. For example, JSP and Faces resolvers need access to a javax.servlet.jsp.JspContext and a javax.faces.context.FacesContext, respectively. Creation of ELContext objects is controlled through the underlying technology. For example, in JSP the JspContext.getELContext() factory method is used. Some technologies provide the ability to add an {@link ELContextListener} so that applications and frameworks can ensure their own contextobjects are attached to any newly created ELContext. Because it stores state during expression evaluation, an ELContext object is not thread-safe. Care should be taken to never share an ELContext instance between two or more threads.

                new Component(clazz));
    }


    @Test
    public void testContextManagement() throws Exception {
        ELContext elContext = EL.createELContext();
        SeamELResolver seamVariableResolver = new SeamELResolver();
        // org.jboss.seam.bpm.SeamVariableResolver jbpmVariableResolver = new
        // org.jboss.seam.bpm.SeamVariableResolver();


        MockServletContext servletContext = new MockServletContext();

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import org.jboss.resteasy.links.ELProvider;


public class SeamELProvider implements ELProvider {


  public ELContext getContext(final ELContext ctx) {
    return new ELContext() {


      private SeamFunctionMapper functionMapper;


      @Override
      public ELResolver getELResolver() {

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    return createELContext(createELResolver(base), new FunctionMapperImpl());
  }


  public static ELContext createELContext(final ELResolver resolver,
      final FunctionMapper functionMapper) {
    return new ELContext() {
      final VariableMapperImpl variableMapper = new VariableMapperImpl();


      @Override
      public ELResolver getELResolver() {
        return resolver;

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      throw new ServiceDiscoveryException(m, "Failed to instantiate ELProvider: "+elProviderClass.getName(), x);
    }
  }


  private static ELContext getELContext(Method m, Object base){
    ELContext ours = EL.createELContext(base);
    ELProvider elProvider = getELProvider(m);
    if(elProvider != null)
      return elProvider.getContext(ours);
    return ours;
  }

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    public ExpressionFactory getExpressionFactory() {
        return expressionFactoryImpl;
    }
    
    ELContext createNewELContext(final FreeMarkerPageContext pageCtx) {
        ELContext ctx = new FreeMarkerELContext(pageCtx);
        ELContextEvent event = new ELContextEvent(ctx);
        synchronized(listeners) {
            for (Iterator iter = listeners.iterator(); iter.hasNext();) {
                ELContextListener l = (ELContextListener) iter.next();
                l.contextCreated(event);

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  public void prepare()
    throws JspTagException
  {
        // jsp/1ce6
    if (_items != null && _items.contains("#{")) {
      ELContext elContext = pageContext.getELContext();


      deferredExpression
        = JspUtil.createValueExpression(elContext, String.class, _items);


      _items = (String) deferredExpression.getValue(elContext);

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  public void processAction(ActionEvent event)
    throws AbortProcessingException
  {
    FacesContext context = FacesContext.getCurrentInstance();


    ELContext elContext = context.getELContext();


    Object value = _value.getValue(elContext);


    _target.setValue(elContext, value);
  }

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                              String viewId,
                              String phaseId
  )
    throws UnsupportedEncodingException
  {
    ELContext elContext = context.getELContext();


    ValueExpression valueExpression = context.getApplication()
      .getExpressionFactory()
      .createValueExpression(elContext, expression, Object.class);

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  protected DateFormat getFormat()
    throws JspException, ELException
  {
    PageContextImpl pageContext = (PageContextImpl) this.pageContext;
    ELContext env = pageContext.getELContext();
    
    DateFormat format = null;
    Locale locale = null;


    if (_parseLocaleExpr != null) {

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  public int doEndTag() throws JspException
  {
    Connection conn = null;
    boolean isTransaction = false;
    ELContext env = pageContext.getELContext();
    
    try {
      String sql;


      if (_sql != null)

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