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Seam core module for Seam framework integrated with JSF2
There is a newer version: 3.2.26.ayg
package org.jboss.seam.core;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import java.util.concurrent.ConcurrentHashMap;

import org.jboss.seam.Seam;
import org.jboss.seam.contexts.Contexts;
import org.jboss.seam.contexts.Lifecycle;
import org.jboss.seam.navigation.Pages;
import org.jboss.seam.util.EnumerationEnumeration;

/**
 * The Seam resource bundle which searches for resources in delegate resource
 * bundles specified in pages.xml, and a configurable list of delegate resource
 * bundles specified in components.xml.
 * 
 * @see ResourceLoader
 * @author Gavin King
 * 
 */
public class SeamResourceBundle extends java.util.ResourceBundle {
	private Map>> bundleCache = new ConcurrentHashMap>>();

	public SeamResourceBundle() {
		super();
	}
	
	private Map> getCachedBundle() {
		Init init;
		if (Contexts.isApplicationContextActive()) {
			init = (Init) Contexts.getApplicationContext().get(Seam.getComponentName(Init.class));
		} else {
			//not sure if this is nessesary
			init = (Init) Lifecycle.getApplication().get(Seam.getComponentName(Init.class));
		}
		if (!bundleCache.containsKey(init)) {
			bundleCache.put(init, new ConcurrentHashMap>());
		}
		return bundleCache.get(init);
	}

	/**
	* Get an instance for the current Seam Locale
	* 
	* @see Locale
	* 
	* @return a SeamResourceBundle
	*/
	public static java.util.ResourceBundle getBundle() {
		return java.util.ResourceBundle.getBundle(SeamResourceBundle.class.getName(), org.jboss.seam.core.Locale.instance()); //note: it does not really matter what we pass here
	}

	public static java.util.ResourceBundle getBundleNamed(String bundleName) {
		return java.util.ResourceBundle.getBundle(bundleName, org.jboss.seam.core.Locale.instance());
	}

	private List getBundlesForCurrentLocale() {
		Locale instance = org.jboss.seam.core.Locale.instance();
		List bundles = getCachedBundle().get(instance);
		if (bundles == null) {
			bundles = loadBundlesForCurrentLocale();
			getCachedBundle().put(instance, bundles);
		}
		return bundles;

	}

	private List loadBundlesForCurrentLocale() {
		List bundles = new ArrayList();
		ResourceLoader resourceLoader = ResourceLoader.instance();
		for (String bundleName : resourceLoader.getBundleNames()) {
			ResourceBundle bundle = resourceLoader.loadBundle(bundleName);
			if (bundle != null) {
				bundles.add(bundle);
			}
		}
		ResourceBundle bundle = resourceLoader.loadBundle("ValidatorMessages");
		if (bundle != null) {
			bundles.add(bundle);
		}
		bundle = resourceLoader.loadBundle("org/hibernate/validator/ValidationMessages");
		if (bundle != null) {
			bundles.add(bundle);
		}
		bundle = resourceLoader.loadBundle("javax.faces.Messages");
		if (bundle != null) {
			bundles.add(bundle);
		}
		return Collections.unmodifiableList(bundles);
	}

	@Override
	public Enumeration getKeys() {
		if (!Contexts.isApplicationContextActive()) {
			return Collections.emptyEnumeration();
		}
		List pageBundles = getPageResourceBundles();
		List bundles = getBundlesForCurrentLocale();
		Enumeration[] enumerations = new Enumeration[bundles.size() + pageBundles.size()];

		int i = 0;
		for (java.util.ResourceBundle bundle : pageBundles) {
			enumerations[i++] = bundle.getKeys();
		}

		for (ResourceBundle bundle : bundles) {
			enumerations[i++] = bundle.getKeys();
		}

		return new EnumerationEnumeration(enumerations);
	}

	@Override
	protected Object handleGetObject(String key) {
		if (!Contexts.isApplicationContextActive()) {
			return null;
		}
		List pageBundles = getPageResourceBundles();
		for (java.util.ResourceBundle pageBundle : pageBundles) {
			try {
				return interpolate(pageBundle.getObject(key));
			} catch (MissingResourceException ignored) {
			}
		}

		for (java.util.ResourceBundle littleBundle : getBundlesForCurrentLocale()) {
			try {
				return interpolate(littleBundle.getObject(key));
			} catch (MissingResourceException ignored) {
			}
		}

		return null; // superclass is responsible for throwing MRE
	}

	private Object interpolate(Object message) {
		return message instanceof String ? Interpolator.instance().interpolate((String) message) : message;
	}

	private List getPageResourceBundles() {
		if (!Contexts.isApplicationContextActive()) {
			return Collections.emptyList();
		}
		// TODO: oops! A hard dependency to JSF!
		String viewId = Pages.getCurrentViewId();
		if (viewId != null && Pages.instance() != null) {
			// we can't cache these bundles, since the viewId
			// may change in the middle of a request
			return Pages.instance().getResourceBundles(viewId);
		} else {
			return Collections.emptyList();
		}
	}

	@Override
	public Locale getLocale() {
		try {
			return org.jboss.seam.core.Locale.instance();
		} catch (Exception e) {
			return Locale.getDefault();
		}
	}

}