src/main/java/org/apache/sling/pipes/internal/AbstractPlumberServlet.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.sling.pipes.internal;

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.apache.sling.pipes.OutputWriter;

import java.io.IOException;

public class AbstractPlumberServlet extends SlingAllMethodsServlet {

    /**
     * Retrieve an output writer depending on the request
     * @param request original request against which writers will be tested
     * @param response response writers will point to
     * @return instance of the created writer
     * @throws IOException bad handling of I/O streams,
     */
    OutputWriter getWriter(SlingHttpServletRequest request, SlingHttpServletResponse response) throws IOException {
        OutputWriter[] candidates = new OutputWriter[]{new CsvWriter(), new JsonWriter()};
        for (OutputWriter candidate : candidates) {
            if (candidate.handleRequest(request)) {
                candidate.init(request, response);
                return candidate;
            }
        }
        return null;
    }
}