org.springframework.restdocs.hypermedia.AtomLinkExtractor.java Source code

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Here is the source code for org.springframework.restdocs.hypermedia.AtomLinkExtractor.java

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/*
 * Copyright 2014-2018 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.restdocs.hypermedia;

import java.util.Collection;
import java.util.List;
import java.util.Map;

import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

/**
 * {@link LinkExtractor} that extracts links in Atom format.
 *
 * @author Andy Wilkinson
 */
@SuppressWarnings("unchecked")
class AtomLinkExtractor extends AbstractJsonLinkExtractor {

    @Override
    public Map<String, List<Link>> extractLinks(Map<String, Object> json) {
        MultiValueMap<String, Link> extractedLinks = new LinkedMultiValueMap<>();
        Object possibleLinks = json.get("links");
        if (possibleLinks instanceof Collection) {
            Collection<Object> linksCollection = (Collection<Object>) possibleLinks;
            for (Object linkObject : linksCollection) {
                if (linkObject instanceof Map) {
                    Link link = maybeCreateLink((Map<String, Object>) linkObject);
                    maybeStoreLink(link, extractedLinks);
                }
            }
        }
        return extractedLinks;
    }

    private static Link maybeCreateLink(Map<String, Object> linkMap) {
        Object hrefObject = linkMap.get("href");
        Object relObject = linkMap.get("rel");
        if (relObject instanceof String && hrefObject instanceof String) {
            Object titleObject = linkMap.get("title");
            return new Link((String) relObject, (String) hrefObject,
                    (titleObject instanceof String) ? (String) titleObject : null);
        }
        return null;
    }

    private static void maybeStoreLink(Link link, MultiValueMap<String, Link> extractedLinks) {
        if (link != null) {
            extractedLinks.add(link.getRel(), link);
        }
    }

}