Java DefaultExpressionEvaluator類代碼示例

import org.kuali.rice.krad.uif.view.DefaultExpressionEvaluator; //導入依賴的package包/類
/**
 * Return an instance of {@link org.kuali.rice.krad.uif.view.ExpressionEvaluator} that can be used for evaluating
 * expressions contained on the view
 *
 * <p>
 * A ExpressionEvaluator must be initialized with a model for expression evaluation. One instance is
 * constructed for the view lifecycle and made available to all components/helpers through this method
 * </p>
 *
 * @return instance of ExpressionEvaluator
 */
public static ExpressionEvaluator getExpressionEvaluator() {
    ViewLifecycleProcessor processor = PROCESSOR.get();

    if (processor == null) {
        ExpressionEvaluatorFactory expressionEvaluatorFactory =
                KRADServiceLocatorWeb.getExpressionEvaluatorFactory();

        if (expressionEvaluatorFactory == null) {
            return new DefaultExpressionEvaluator();
        } else {
            return expressionEvaluatorFactory.createExpressionEvaluator();
        }
    }

    return processor.getExpressionEvaluator();
}
 

import org.kuali.rice.krad.uif.view.DefaultExpressionEvaluator; //導入依賴的package包/類
/**
 * Creates a new synchronous processor for a lifecycle.
 * 
 * @param lifecycle The lifecycle to process.
 */
public SynchronousViewLifecycleProcessor(ViewLifecycle lifecycle) {
    super(lifecycle);

    // The null conditions noted here should not happen in full configured environments
    // Conditional fallback support is in place primary for unit testing.
    ExpressionEvaluatorFactory expressionEvaluatorFactory;
    if (lifecycle.helper == null) {
        LOG.warn("No helper is defined for the view lifecycle, using global expression evaluation factory");
        expressionEvaluatorFactory = KRADServiceLocatorWeb.getExpressionEvaluatorFactory();
    } else {
        expressionEvaluatorFactory = lifecycle.helper.getExpressionEvaluatorFactory();
    }

    if (expressionEvaluatorFactory == null) {
        LOG.warn("No global expression evaluation factory is defined, using DefaultExpressionEvaluator");
        expressionEvaluator = new DefaultExpressionEvaluator();
    } else {
        expressionEvaluator = expressionEvaluatorFactory.createExpressionEvaluator();
    }
}
 

import org.kuali.rice.krad.uif.view.DefaultExpressionEvaluator; //導入依賴的package包/類
/**
 * Gets the expression evaluator service
 *
 * @return expression evaluator service
 */
public ExpressionEvaluator getExpressionEvaluator() {
    if (this.expressionEvaluator == null) {
        this.expressionEvaluator = new DefaultExpressionEvaluator();
    }

    return this.expressionEvaluator;
}