JsonHomeController.java

/*
 * Copyright 2012 Guido Steinacker
 *
 * 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 de.otto.jsonhome.controller;

import de.otto.jsonhome.generator.JsonHomeSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletResponse;
import java.net.URI;
import java.util.Map;

import static de.otto.jsonhome.converter.JsonHomeConverter.toRepresentation;
import static de.otto.jsonhome.converter.JsonHomeMediaType.APPLICATION_JSON;
import static de.otto.jsonhome.converter.JsonHomeMediaType.APPLICATION_JSONHOME;
import static java.net.URI.create;


/**
 * A Spring controller, serving a json-home document.
 *
 * @author Guido Steinacker
 * @since 15.09.12
 */
@Controller
@RequestMapping(value = "/json-home")
public class JsonHomeController {

    private static Logger LOG = LoggerFactory.getLogger(JsonHomeController.class);

    private JsonHomeSource jsonHomeSource;
    private URI relationTypeBaseUri;
    private int maxAge = 3600;

    @Autowired
    public void setJsonHomeSource(final JsonHomeSource jsonHomeSource) {
        this.jsonHomeSource = jsonHomeSource;
    }

    @Value("${jsonhome.relationTypeBaseUri}")
    public void setRelationTypeBaseUri(String relationTypeBaseUri) {
        this.relationTypeBaseUri = create(relationTypeBaseUri);
        LOG.info("RelationTypeBaseUri is {}", relationTypeBaseUri);
    }

    public URI relationTypeBaseUri() {
        return relationTypeBaseUri;
    }

    public void setMaxAgeSeconds(int maxAge) {
        this.maxAge = maxAge;
        LOG.info("MaxAge is {}", maxAge);
    }

    @RequestMapping(produces = {"application/json-home"})
    @ResponseBody
    public Map<String, ?> getAsApplicationJsonHome(final HttpServletResponse response) {
        LOG.info("Returning json-home in application/json-home format.");
        // home document should be cached:
        response.setHeader("Cache-Control", "max-age=" + maxAge);
        response.setHeader("Vary", "Accept");
        return toRepresentation(jsonHomeSource.getJsonHome(), APPLICATION_JSONHOME);
    }

    @RequestMapping(produces = {"application/json"})
    @ResponseBody
    public Map<String, ?> getAsApplicationJson(final HttpServletResponse response) {
        LOG.info("Returning json-home in application/json format.");
        // home document should be cached:
        response.setHeader("Cache-Control", "max-age=" + maxAge);
        response.setHeader("Vary", "Accept");
        return toRepresentation(jsonHomeSource.getJsonHome(), APPLICATION_JSON);
    }


}