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SendGrid implementation for Ogham

There is a newer version: 3.0.0

package fr.sii.ogham.email.sender.impl.sendgrid.handler;

import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sendgrid.SendGrid.Email;

import fr.sii.ogham.core.message.content.Content;
import fr.sii.ogham.email.exception.sendgrid.ContentHandlerException;

/**
 * Implementation of {@link SendGridContentHandler} that delegates content
 * handling to specialized instances, if one matching the actual content type
 * has been declared.
 */
public final class MapContentHandler implements SendGridContentHandler {

	private static final Logger LOG = LoggerFactory.getLogger(MapContentHandler.class);

	private final Map, SendGridContentHandler> handlers;

	/**
	 * Constructor.
	 */
	public MapContentHandler() {
		this.handlers = new HashMap<>();
	}

	/**
	 * Registers a handler for a given content type.
	 * 
	 * @param clazz
	 *            the content type
	 * @param handler
	 *            the handler
	 * 
	 * @return the handler formerly associated with the content type, if there
	 *         was one
	 */
	public SendGridContentHandler register(final Class clazz, final SendGridContentHandler handler) {
		if (handler == null) {
			throw new IllegalArgumentException("[handler] cannot be null");
		}
		if (clazz == null) {
			throw new IllegalArgumentException("[clazz] cannot be null");
		}

		LOG.debug("Registering content handler {} for content type {}", handler, clazz);
		return handlers.put(clazz, handler);
	}

	@Override
	public void setContent(final Email email, final Content content) throws ContentHandlerException {
		if (email == null) {
			throw new IllegalArgumentException("[email] cannot be null");
		}
		if (content == null) {
			throw new IllegalArgumentException("[content] cannot be null");
		}

		final Class clazz = content.getClass();
		LOG.debug("Getting content handler for type {}", clazz);
		final SendGridContentHandler handler = handlers.get(clazz);
		if (handler == null) {
			LOG.warn("No content handler found for requested type {}", clazz);
			throw new ContentHandlerException("No content handler found for content type " + clazz.getSimpleName());
		} else {
			handler.setContent(email, content);
		}
	}

}