WebletUtils.java

package net.java.dev.weblets;

import net.java.dev.weblets.util.IWebletUtils;
import net.java.dev.weblets.util.ServiceLoader;

import java.io.InputStream;

/**
 * @author Werner Punz Date: 30.12.2007 Time: 18:00:04
 */
public class WebletUtils {
	/**
	 * constractual method
	 * 
	 * @param weblet
	 *            the weblet name
	 * @param pathInfo
	 *            the path info to the resource
	 * @return the resource path for the resource
	 */
	public static String getResource(String weblet, String pathInfo) {
		return instance.getResource(weblet, pathInfo);
	}

	/**
	 * constractual method
	 * 
	 * @param weblet
	 *            the weblet name
	 * @param pathInfo
	 *            the path info to the resource
	 * @return the resource path for the resource
	 */
	public static String getURL(String weblet, String pathInfo) {
		return instance.getURL(weblet, pathInfo);
	}


    /**
     * Reporting case for weblets
     * this methid must be able to deal with requests being null
     * (Special testcases have to be applied to check this!
     *
     * @param weblet    the weblet name
     * @param pathInfo  the pathinfo
     * @param mimeType  the mimetype
     * @return
     */
    public static InputStream getResourceAsStream(String weblet, String pathInfo, String mimeType) {
        return instance.getResourceStream(weblet, pathInfo, mimeType);
    }

    /**
	 * kind of a weird construct but definitely faster than doing all the calls over introspection, the internal contract is defined by the IJSFWebletsUtils
	 * interface
	 */
	static IWebletUtils	instance	= getInstance();

	static IWebletUtils getInstance() throws WebletException {
		synchronized (FacesWebletUtils.class) {
			if (instance == null) {
				Class instantiation = ServiceLoader.loadService(WebletUtils.class.getName());
				try {
					instance = (IWebletUtils) instantiation.newInstance();
				} catch (InstantiationException e) {
					throw new WebletException("Error instantiating WebletsUtil", e);
				} catch (IllegalAccessException e) {
					throw new WebletException("Error instantiating WebletsUtil", e);
				}
			}
		}
		return instance;
	}
}