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  /*
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   * Licensed to the Apache Software Foundation (ASF) under one or more
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   * contributor license agreements.  See the NOTICE file distributed with
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   * this work for additional information regarding copyright ownership.
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   * The ASF licenses this file to You under the Apache License, Version 2.0
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   * (the "License"); you may not use this file except in compliance with
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   * the License.  You may obtain a copy of the License at
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   *
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   *      http://www.apache.org/licenses/LICENSE-2.0
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  *
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  * Unless required by applicable law or agreed to in writing, software
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  * distributed under the License is distributed on an "AS IS" BASIS,
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  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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  * See the License for the specific language governing permissions and
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  * limitations under the License.
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  */
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 package org.apache.sling.servlets.get.impl.helpers;
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The JsonRendererServlet renders the current resource in JSON on behalf of the org.apache.sling.servlets.get.impl.DefaultGetServlet. 
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 public class JsonRendererServlet extends SlingSafeMethodsServlet {
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     private final Logger log = LoggerFactory.getLogger(JsonRendererServlet.class);
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     private static final long serialVersionUID = 5577121546674133317L;
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     public static final String EXT_JSON = "json";
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     private final JsonResourceWriter itemWriter;

    
Recursion level selector that means "all levels"
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     public static final String INFINITY = "infinity";
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     public static final String TIDY = "tidy";
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     public JsonRendererServlet() {
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         itemWriter = new JsonResourceWriter(null);
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     }
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     @Override
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     protected void doGet(SlingHttpServletRequest req,
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             SlingHttpServletResponse resp) throws IOException {
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         // Access and check our data
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         final Resource r = req.getResource();
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         if (ResourceUtil.isNonExistingResource(r)) {
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             throw new ResourceNotFoundException("No data to render.");
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         }
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         // SLING-167: the last selector, if present, gives the number of
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         // recursion levels, 0 being the default
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         int maxRecursionLevels = 0;
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         final String[] selectors = req.getRequestPathInfo().getSelectors();
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         if (selectors != null && selectors.length > 0) {
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             final String level = selectors[selectors.length - 1];
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             if(!TIDY.equals(level)) {
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                 if (INFINITY.equals(level)) {
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                     maxRecursionLevels = -1;
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                 } else {
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                     try {
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                         maxRecursionLevels = Integer.parseInt(level);
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                     } catch (NumberFormatException nfe) {
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                         resp.sendError(HttpServletResponse.SC_BAD_REQUEST,
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                             "Invalid recursion selector value '" + level + "'");
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                         return;
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                     }
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                 }
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             }
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         }
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         resp.setContentType(req.getResponseContentType());
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         resp.setCharacterEncoding("UTF-8");
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         // do the dump
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         try {
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             itemWriter.dump(r, resp.getWriter(), maxRecursionLevels, isTidy(req));
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         } catch (JSONException je) {
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             reportException(je);
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         }
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     }

    
True if our request wants the "tidy" pretty-printed format
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     protected boolean isTidy(SlingHttpServletRequest req) {
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        for(String selector : req.getRequestPathInfo().getSelectors()) {
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            if(TIDY.equals(selector)) {
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                return true;
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            }
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        }
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        return false;
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    }

    

Parameters:
e
Throws:
org.apache.sling.api.SlingException wrapping the given exception
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    private void reportException(Exception e) {
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        log.warn("Error in JsonRendererServlet: " + e.toString(), e);
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        throw new SlingException(e.toString(), e);
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    }
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