com.hastybox.lesscss.compileservice.controller.spring.MappedSpringLessController.java Source code

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Here is the source code for com.hastybox.lesscss.compileservice.controller.spring.MappedSpringLessController.java

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/* Copyright 2011-2012 The Cellador Hastybox Team.
 *
 * 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 com.hastybox.lesscss.compileservice.controller.spring;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;

/**
 * This Controller uses a defined map of CSS regex request URIs to map to
 * specific LESS files. If one of the regex patterns matches, the corresponding
 * LESS file is being compiled and returned.
 * 
 * @author psy
 * 
 */
public class MappedSpringLessController extends AbstractSpringLessController {

    /**
     * logger
     */
    private static final Logger LOGGER;

    static {
        LOGGER = LoggerFactory.getLogger(MappedSpringLessController.class);
    }

    /**
     * contains mapping virtual CSS file to LESS file
     */
    private Map<Pattern, String> mapping;

    /**
     * Mapping (path to CSS in request) => (path to LESS file). BEWARE: The key
     * is compiled to a regex. The value however must be a concrete path.
     * 
     * @param mapping
     *            the mapping to set
     */
    public void setMapping(Map<String, String> mapping) {
        Map<Pattern, String> patternMap = new HashMap<Pattern, String>();
        for (Entry<String, String> entry : mapping.entrySet()) {
            Pattern pattern = Pattern.compile("^.+" + entry.getKey());
            patternMap.put(pattern, entry.getValue());
        }

        this.mapping = patternMap;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.springframework.web.servlet.mvc.Controller#handleRequest(javax.servlet
     * .http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {

        String requestUri = request.getRequestURI();

        LOGGER.debug("Handling request to URI {}" + requestUri);

        String lessPath = null;

        for (Entry<Pattern, String> mappingEntry : mapping.entrySet()) {
            Matcher matcher = mappingEntry.getKey().matcher(requestUri);

            if (matcher.find()) {
                lessPath = mappingEntry.getValue();

                LOGGER.debug("Matched {} to {}", requestUri, lessPath);

                break;
            }

        }

        if (lessPath != null) {
            compileLess(lessPath, response);
        } else {
            // send 404 if no match was found
            LOGGER.info("Could not match {}. Sending 404.", requestUri);
            response.sendError(404);
        }

        return null;
    }

}