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Tools to develop J2EE applications

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/**
 * Copyright 2018 Mike Hummel
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.mhus.lib.portlet.resource;

import java.io.IOException;
import java.io.StringWriter;

import javax.portlet.PortletException;
import javax.portlet.ResourceRequest;
import javax.portlet.ResourceResponse;

import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;

/**
 * Abstract AjaxResource class.
 *
 * @author mikehummel
 * @version $Id: $Id
 */
public abstract class AjaxResource extends AbstractResource {

	/** {@inheritDoc} */
	@Override
	public boolean serveResource(String path, ResourceRequest resourceRequest,
			ResourceResponse resourceResponse) throws IOException,
			PortletException {

		JsonFactory f = new JsonFactory();

		if (isDirectWriteEnabled()) {
			resourceResponse.setContentType("application/json");
			resourceResponse.resetBuffer();
			resourceResponse.setCharacterEncoding("UTF-8");
			JsonGenerator out = f.createJsonGenerator(resourceResponse.getWriter());

			doRequest(resourceRequest, out);
			out.close();

			resourceResponse.flushBuffer();
		} else {
			StringWriter sw = new StringWriter();
			JsonGenerator out = f.createJsonGenerator(sw);
			
			doRequest(resourceRequest, out);
			out.close();
		
			resourceResponse.setContentType("application/json");
			resourceResponse.resetBuffer();
			resourceResponse.setCharacterEncoding("UTF-8");
			resourceResponse.getWriter().print(sw.toString());
			resourceResponse.flushBuffer();
		}
		return true;
	}

	/**
	 * isDirectWriteEnabled.
	 *
	 * @return a boolean.
	 */
	protected boolean isDirectWriteEnabled() {
		return false;
	}

	/**
	 * doRequest.
	 *
	 * @param request a {@link javax.portlet.ResourceRequest} object.
	 * @param out a {@link org.codehaus.jackson.JsonGenerator} object.
	 * @throws java.io.IOException if any.
	 * @throws javax.portlet.PortletException if any.
	 */
	protected abstract void doRequest(ResourceRequest request, JsonGenerator out) throws IOException,
	PortletException;
	
	
}