com.cognifide.cq.cache.plugins.statistics.action.ShowKeysAction.java Source code

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Here is the source code for com.cognifide.cq.cache.plugins.statistics.action.ShowKeysAction.java

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/*
 * Copyright 2015 Cognifide Polska Sp. z o. o..
 *
 * 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.cognifide.cq.cache.plugins.statistics.action;

import com.cognifide.cq.cache.cache.CacheHolder;
import com.cognifide.cq.cache.plugins.statistics.Statistics;
import static com.cognifide.cq.cache.plugins.statistics.html.HtmlBuilder.li;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ShowKeysAction implements StatisticsAction {

    private static final Logger logger = LoggerFactory.getLogger(ShowKeysAction.class);

    private final HttpServletRequest request;

    private final HttpServletResponse response;

    private final CacheHolder cacheHolder;

    public ShowKeysAction(HttpServletRequest request, HttpServletResponse response, CacheHolder cacheHolder) {
        this.request = request;
        this.response = response;
        this.cacheHolder = cacheHolder;
    }

    @Override
    public void exectue() {
        String cacheName = request.getParameter(Statistics.CACHE_NAME_PARAMETER);
        if (StringUtils.isNotEmpty(cacheName)) {
            logger.info("Keys from {} cache will be collected", cacheName);
            try {
                readKeysFrom(cacheName);
            } catch (IOException x) {
                logger.error("Error while generating markup.", x);
                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            }
        } else {
            logger.error("Request does not contain [cacheName] parameter.");
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
        }
    }

    private void readKeysFrom(String cacheName) throws IOException {
        String markup = generateMarkupForKeys(cacheHolder.getKeysFor(cacheName));
        response.getWriter().write(markup);
        response.setStatus(HttpServletResponse.SC_ACCEPTED);
        response.setContentType(StatisticsAction.TEXT_HTML);
        response.setCharacterEncoding(StatisticsAction.UTF_8);
    }

    private String generateMarkupForKeys(Iterable<String> keys) {
        StringBuilder markup = new StringBuilder("<ul>");
        for (String key : keys) {
            markup.append(li(key));
        }
        markup.append("</ul>");
        return markup.toString();
    }
}