/*
 * Copyright 2009-2010 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.hyracks.control.cc.web.handlers.util;

import java.io.IOException;

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

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.json.JSONObject;

public class JSONOutputRequestHandler extends AbstractHandler {
    private final IJSONOutputFunction fn;

    public JSONOutputRequestHandler(IJSONOutputFunction fn) {
        this.fn = fn;
    }

    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        while (target.startsWith("/")) {
            target = target.substring(1);
        }
        while (target.endsWith("/")) {
            target = target.substring(0, target.length() - 1);
        }
        String[] parts = target.split("/");
        try {
            JSONObject result = fn.invoke(parts);
            response.setContentType("application/json");
            result.write(response.getWriter());
            baseRequest.setHandled(true);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}