org.projecthdata.social.api.impl.RootTemplate.java Source code

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Here is the source code for org.projecthdata.social.api.impl.RootTemplate.java

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/*
 * Copyright 2011 The MITRE Corporation
 *
 * 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 org.projecthdata.social.api.impl;

import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.projecthdata.social.api.HData;
import org.projecthdata.social.api.Root;
import org.projecthdata.social.api.RootOperations;
import org.projecthdata.social.api.Section;
import org.projecthdata.social.api.atom.AtomFeed;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

public class RootTemplate extends AbstractHDataOperations implements RootOperations {
    private final RestTemplate restTemplate;
    private final HData hData;
    private HttpEntity<?> atomFeedRequestEntity = null;
    private URI ehrUri = null;
    private static final String ROOT_PATH = "root.xml";

    public RootTemplate(HData hData, RestTemplate restTemplate, boolean isAuthorizedForUser) {
        super(isAuthorizedForUser);
        this.restTemplate = restTemplate;
        this.hData = hData;
        this.ehrUri = URI.create(hData.getEhrUrl());

        // setup the correct accept headers for processing an atom feed
        List<MediaType> acceptableMediaTypes = new ArrayList<MediaType>();
        acceptableMediaTypes.add(MediaType.APPLICATION_ATOM_XML);
        acceptableMediaTypes.add(MediaType.APPLICATION_XML);

        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAccept(acceptableMediaTypes);

        this.atomFeedRequestEntity = new HttpEntity<Object>(requestHeaders);

    }

    public Root getRoot() {
        String url = ehrUri.toString() + "/" + ROOT_PATH;
        return restTemplate.getForObject(url, Root.class);
    }

    /**
     * Retrieves the atom feed for a given section
     * 
     * @param section
     * @return
     */
    public AtomFeed getSectionFeed(Section section) {
        String url = ehrUri.toString() + "/" + section.getPath();
        return getForAtomFeed(url);
    }

    /**
     * Adds the correct accept header for a GET request of an atom feed
     * 
     * @param url
     *            - the URL of the feed to request
     * @return
     */
    public AtomFeed getForAtomFeed(String url) {
        ResponseEntity<AtomFeed> response = restTemplate.exchange(url, HttpMethod.GET, atomFeedRequestEntity,
                AtomFeed.class);
        AtomFeed feed = null;
        try {
            feed = response.getBody();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return feed;
    }

    @Override
    public RestTemplate getRestTemplate() {
        return restTemplate;
    }
}