Example usage for javax.el ExpressionFactory createValueExpression

Introduction

In this page you can find the example usage for javax.el ExpressionFactory createValueExpression.

Prototype

public abstract ValueExpression createValueExpression(ELContext context, String expression,
        Class<?> expectedType);

Source Link

Document

Create a new value expression.

Usage

From source file:inti.ws.spring.resource.template.TemplateResource.java

protected String applyTemplate(ExpressionFactory factory, String templateName, String templateFile) {
    ValueExpression var;
    Object val;
    SimpleContext templateContext = new SimpleContext();
    ValueExpression templateContent;/*  ww w .  j  ava2  s . c o m*/

    templateContent = factory.createValueExpression(templateContext, template, String.class);
    var = factory.createValueExpression(templateContext, "${content}", String.class);
    var.setValue(templateContext, templateFile.replaceAll("\"", "\\\\\""));

    for (Map.Entry<String, Object> parameter : parameters.entrySet()) {
        var = factory.createValueExpression(templateContext, "${" + parameter.getKey() + '}', String.class);
        val = parameter.getValue();

        if ("$filename".equals(val)) {
            val = templateName;
        } else if ("$modulename".equals(val)) {
            val = moduleName;
        }

        var.setValue(templateContext, val);
    }

    return (String) templateContent.getValue(templateContext);
}

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From source file:com.googlecode.jsfFlex.taglib.AbstractFlexUIComponentTagBase.java

protected void setProperties(UIComponent component) {
    super.setProperties(component);

    FacesContext context = FacesContext.getCurrentInstance();
    ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();

    if (_value != null) {
        component.setValueExpression(VALUE_ATTR, _value);
    }/*from   ww w .j  a v  a2s  .c  o m*/

    if (_converter != null) {
        if (component instanceof ValueHolder) {
            ValueExpression ve = expressionFactory.createValueExpression(context.getELContext(), _converter,
                    Object.class);
            if (ve != null) {
                component.setValueExpression(CONVERTER_ATTR, ve);
            } else {
                Converter converter = context.getApplication().createConverter(_converter);
                ((ValueHolder) component).setConverter(converter);
            }
        } else {
            _log.error("Component " + component.getClass().getName() + " is no ValueHolder, cannot set value.");
        }
    }

}

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From source file:inti.ws.spring.resource.FilteredWebResource.java

@Override
public void update() throws Exception {
    ExpressionFactory factory;
    ValueExpression var;
    Object val;
    StringBuilder builder = new StringBuilder(32);
    MessageDigest digest = DIGESTS.get();

    for (WebResource dependency : dependencies) {
        dependency.updateIfNeeded();/* w w w  . jav  a  2s  .c om*/
    }

    super.update();

    factory = ExpressionFactory.newInstance();
    content = factory.createValueExpression(context, compressedFile, String.class);
    for (Map.Entry<String, Object> parameter : parameters.entrySet()) {
        var = factory.createValueExpression(context, "${" + parameter.getKey() + '}', String.class);
        val = parameter.getValue();
        if (val instanceof WebResource) {
            ((WebResource) val).updateIfNeeded();
            val = ((WebResource) val).getContent().hashCode();
        }
        var.setValue(context, val);
    }
    compressedFile = (String) content.getValue(context);

    digest.reset();
    builder.append(Hex.encodeHexString(digest.digest(compressedFile.getBytes(StandardCharsets.UTF_8))));
    messageDigest = builder.toString();
    builder.delete(0, builder.length());

    DATE_FORMATTER.formatDate(lastModified, builder);
    lastModifiedString = builder.toString();
}

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From source file:inti.ws.spring.resource.template.TemplateResource.java

@Override
public void update() throws Exception {
    ExpressionFactory factory;
    ValueExpression var;
    Object val;
    StringBuilder builder = new StringBuilder(2048);
    MessageDigest digest = DIGESTS.get();

    factory = ExpressionFactory.newInstance();

    for (WebResource file : files) {
        if (file.hasChanged()) {
            file.update();// ww  w.j  a va2  s .com
        }
        builder.append(applyTemplate(factory, file.getName(), file.getContent().replaceAll("\\s+", " ")));
        builder.append(',');
    }
    builder.delete(builder.length() - 1, builder.length());

    super.update();

    content = factory.createValueExpression(context, compressedFile, String.class);

    var = factory.createValueExpression(context, "${files}", String.class);
    var.setValue(context, builder.toString());

    if (parameters != null) {

        for (Map.Entry<String, Object> parameter : parameters.entrySet()) {
            var = factory.createValueExpression(context, "${" + parameter.getKey() + '}', String.class);
            val = parameter.getValue();

            if ("$filename".equals(val)) {
                val = resource.getFile();
            } else if ("$modulename".equals(val)) {
                val = moduleName;
            }

            var.setValue(context, val);
        }

    }
    compressedFile = (String) content.getValue(context);
    builder.delete(0, builder.length());

    digest.reset();
    builder.append(Hex.encodeHexString(digest.digest(compressedFile.getBytes(StandardCharsets.UTF_8))));
    messageDigest = builder.toString();
    builder.delete(0, builder.length());

    DATE_FORMATTER.formatDate(lastModified, builder);
    lastModifiedString = builder.toString();
}

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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);
}

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From source file:org.ajax4jsf.context.ViewResources.java

private static String getInitParameterValue(FacesContext context, String parameterName) {

    String key = INIT_PARAMETER_PREFIX + parameterName;

    ExternalContext externalContext = context.getExternalContext();
    Map<String, Object> applicationMap = externalContext.getApplicationMap();
    Object mutex = externalContext.getRequest();
    Object parameterValue = null;

    synchronized (mutex) {
        parameterValue = applicationMap.get(key);

        if (parameterValue == null) {

            String initParameter = externalContext.getInitParameter(parameterName);
            if (initParameter != null) {

                if (ELUtils.isValueReference(initParameter)) {
                    Application application = context.getApplication();
                    ExpressionFactory expressionFactory = application.getExpressionFactory();

                    parameterValue = expressionFactory.createValueExpression(context.getELContext(),
                            initParameter, String.class);
                } else {
                    parameterValue = initParameter;
                }//w  w w  .ja v  a  2  s  .co m

            } else {
                parameterValue = NULL;
            }

            applicationMap.put(key, parameterValue);
        }
    }

    return evaluate(context, parameterValue);
}

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From source file:org.apache.camel.language.juel.JuelExpression.java

public <T> T evaluate(Exchange exchange, Class<T> tClass) {
    // TODO we could use caching here but then we'd have possible concurrency issues
    // so lets assume that the provider caches

    // Create (if needed) the ExpressionFactory first from the CamelContext using FactoryFinder
    ExpressionFactory factory = getExpressionFactory(exchange.getContext());
    ELContext context = populateContext(createContext(), exchange);
    ValueExpression valueExpression = factory.createValueExpression(context, expression, type);
    Object value = valueExpression.getValue(context);
    return exchange.getContext().getTypeConverter().convertTo(tClass, value);
}

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From source file:org.apache.myfaces.application.ApplicationImpl.java

@SuppressWarnings("unchecked")
@Override//from  ww w. j  a  v  a 2s .co  m
public final <T> T evaluateExpressionGet(final FacesContext context, final String expression,
        final Class<? extends T> expectedType) throws ELException {
    ELContext elContext = context.getELContext();

    ExpressionFactory factory = getExpressionFactory();

    return (T) factory.createValueExpression(elContext, expression, expectedType).getValue(elContext);
}

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From source file:org.apache.myfaces.config.ManagedBeanBuilder.java

private void initializeMap(FacesContext facesContext, MapEntries mapEntries,
        Map<? super Object, ? super Object> map) {
    Application application = facesContext.getApplication();

    Class<?> keyClass = (mapEntries.getKeyClass() == null) ? String.class
            : ClassUtils.simpleJavaTypeToClass(mapEntries.getKeyClass());

    Class<?> valueClass = (mapEntries.getValueClass() == null) ? String.class
            : ClassUtils.simpleJavaTypeToClass(mapEntries.getValueClass());

    ValueExpression valueExpression;//from   ww w. ja va2s . c om
    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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From source file:org.apache.myfaces.config.ManagedBeanBuilder.java

private void initializeList(FacesContext facesContext, ListEntries listEntries, List<? super Object> list) {
    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);/*from w w w . j av  a  2 s. co  m*/
        } 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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