Accessing constants in JSF

Daz — Fri, 28 Aug 2009 00:11:00 +0100


marker interface:

package uk.co.tarbard.wfd;

public interface BackingPage {

}

custom property resolver:

package uk.co.tarbard.wfd;

import java.lang.reflect.Field;

import javax.faces.el.EvaluationException;
import javax.faces.el.PropertyNotFoundException;
import javax.faces.el.PropertyResolver;

public class ConstantPropertyResolver extends PropertyResolver {

	private PropertyResolver original;

	public ConstantPropertyResolver(PropertyResolver original) {
		this.original = original;
	}

	@Override
	public Class getType(Object arg0, int arg1) throws EvaluationException,
			PropertyNotFoundException {

		return original.getType(arg0, arg1);
	}

	@Override
	public Class getType(Object arg0, Object arg1) throws EvaluationException,
			PropertyNotFoundException {

		return original.getType(arg0, arg1);
	}

	@Override
	public Object getValue(Object arg0, int arg1) throws EvaluationException,
			PropertyNotFoundException {
		return original.getValue(arg0, arg1);
	}

	@Override
	public Object getValue(Object base, Object property)
			throws EvaluationException, PropertyNotFoundException {
		Object value = null;
		try {
			value = original.getValue(base, property);

		} catch (PropertyNotFoundException e) {

		}

		if (null != value) {
			return value;
		}
		if (null == base) {
			return null;
		}
		if (base instanceof BackingPage) {
			Field[] declaredFields = base.getClass().getDeclaredFields();
			for (int i = 0; i < declaredFields.length; i++) {
				Field x = declaredFields[i];
				Object constantValue = null;
				if (property.equals(x.getName())){
					try {
						constantValue =  x.get(x);
					} catch (IllegalArgumentException e) {
						throw new PropertyNotFoundException("unable to access property " + property) ;
					} catch (IllegalAccessException e) {
						throw new PropertyNotFoundException("unable to access property " + property + " check that it is public") ;
					}
					return constantValue;
				}
				
			}
			throw new PropertyNotFoundException("unable to locate constant with name " + property + " perhaps you made a typo.");
		}

		return null;

	}

	@Override
	public boolean isReadOnly(Object arg0, int arg1)
			throws EvaluationException, PropertyNotFoundException {
		return original.isReadOnly(arg0, arg1);
	}

	@Override
	public boolean isReadOnly(Object arg0, Object arg1)
			throws EvaluationException, PropertyNotFoundException {
		return original.isReadOnly(arg0, arg1);
	}

	@Override
	public void setValue(Object arg0, int arg1, Object arg2)
			throws EvaluationException, PropertyNotFoundException {
		original.setValue(arg0, arg1, arg2);
	}

	@Override
	public void setValue(Object arg0, Object arg1, Object arg2)
			throws EvaluationException, PropertyNotFoundException {
		original.setValue(arg0, arg1, arg2);
	}

}

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Tue, 31 Aug 2010 10:54:05 +0100

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"Accessing constants in JSF" by angular cheilitis

Tue, 20 Jul 2010 06:18:22 +0100

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"Accessing constants in JSF" by used cars indianapolis indiana

Wed, 23 Jun 2010 20:05:27 +0100

The exceptions you have permitted in this piece of code really need to be swallowed in order to be executable. Definitely a band aid for surgery at this point.

"Accessing constants in JSF" by daz

Fri, 28 Aug 2009 00:21:12 +0100

I need to sort out a swallowed exception but this article is a quick pastebin for me for now.

Once and Only Once : Accessing constants in JSF

Accessing constants in JSF

"Accessing constants in JSF" by used lease cars

"Accessing constants in JSF" by angular cheilitis

"Accessing constants in JSF" by used cars indianapolis indiana

"Accessing constants in JSF" by daz