org.eclipse.osbp.ecview.extension.grid.sample/src/org/eclipse/osbp/ecview/extension/sample/ResourceProvider.java

/**
 *                                                                            
 *  Copyright (c) 2011, 2016 - Loetz GmbH&Co.KG (69115 Heidelberg, Germany) 
 *                                                                            
 *  All rights reserved. This program and the accompanying materials           
 *  are made available under the terms of the Eclipse Public License 2.0        
 *  which accompanies this distribution, and is available at                  
 *  https://www.eclipse.org/legal/epl-2.0/                                 
 *                                 
 *  SPDX-License-Identifier: EPL-2.0                                 
 *                                                                            
 *  Contributors:                                                      
 * 	   Florian Pirchner - Initial implementation
 * 
 */
package org.eclipse.osbp.ecview.extension.sample;

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.osgi.framework.Bundle;
import org.osgi.service.http.HttpContext;

/**
 * Resource provider is responsible to look for resources requested by the
 * HttpService. Therefore it uses the classpath of registered bundles.
 */
public class ResourceProvider implements HttpContext {

	/** The resources. */
	private List<Bundle> resources = new ArrayList<Bundle>();

	/* (non-Javadoc)
	 * @see org.osgi.service.http.HttpContext#getResource(java.lang.String)
	 */
	@Override
	public URL getResource(String uri) {
		URL resource = null;
		// iterate over the vaadin bundles and try to find the requested
		// resource
		for (Bundle bundle : resources) {
			resource = bundle.getResource(uri);
			if (resource != null) {
				break;
			}
		}
		return resource;
	}

	/**
	 * Adds a bundle that may potentially contain a requested resource.
	 *
	 * @param bundle
	 *            the bundle
	 */
	public void add(Bundle bundle) {
		if(!resources.contains(bundle)){
			resources.add(bundle);
		}
	}

	/**
	 * Removes a bundle that may potentially contain a requested resource.
	 *
	 * @param bundle
	 *            the bundle
	 */
	public void remove(Bundle bundle) {
		resources.remove(bundle);
	}
	
	/* (non-Javadoc)
	 * @see org.osgi.service.http.HttpContext#getMimeType(java.lang.String)
	 */
	@Override
	public String getMimeType(String arg0) {
		return null;
	}
	
	/* (non-Javadoc)
	 * @see org.osgi.service.http.HttpContext#handleSecurity(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	 */
	@Override
	public boolean handleSecurity(HttpServletRequest request,
			HttpServletResponse response) throws IOException {
		return true;
	}
}