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package org.apache.wink.server.handlers;

import java.util.Properties;

/**
 * Convenience class for implementing a handler that is unaware of the handlers
 * chain. A handler may extend this class and implement any or all of
 * {@link #init(Properties)}, {@link #handleRequest(MessageContext)} and
 * {@link #handleResponse(MessageContext)}
 */
public abstract class AbstractHandler implements RequestHandler, ResponseHandler {

    public final void handleRequest(MessageContext context, HandlersChain chain) throws Throwable {
        handleRequest(context);
        chain.doChain(context);
    }

    public final void handleResponse(MessageContext context, HandlersChain chain) throws Throwable {
        handleResponse(context);
        chain.doChain(context);
    }

    /**
     * Override this method if initialization functionality is required
     * 
     * @see {@link Handler#init(Properties)}
     */
    public void init(Properties props) {
    }

    /**
     * Override this method to handle the request. This method releases the
     * responsibility of the user to continue the chain, as it is done
     * automatically at the end of the method invocation
     * 
     * @param context the current message context
     * @see {@link RequestHandler#handleRequest(MessageContext, HandlersChain)}
     */
    protected void handleRequest(MessageContext context) throws Throwable {
    }

    /**
     * Override this method to handle the response. This method releases the
     * responsibility of the user to continue the chain, as it is done
     * automatically at the end of the method invocation
     * 
     * @param context the current message context
     * @see {@link ResponseHandler#handleResponse(MessageContext, HandlersChain)}
     */
    protected void handleResponse(MessageContext context) throws Throwable {
    }

}