de.thingweb.servient.impl.HypermediaIndex.java Source code

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Here is the source code for de.thingweb.servient.impl.HypermediaIndex.java

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/*
 *
 *  * The MIT License (MIT)
 *  *
 *  * Copyright (c) 2015 Siemens AG and the thingweb community
 *  *
 *  * Permission is hereby granted, free of charge, to any person obtaining a copy
 *  * of this software and associated documentation files (the "Software"), to deal
 *  * in the Software without restriction, including without limitation the rights
 *  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  * copies of the Software, and to permit persons to whom the Software is
 *  * furnished to do so, subject to the following conditions:
 *  *
 *  * The above copyright notice and this permission notice shall be included in
 *  * all copies or substantial portions of the Software.
 *  *
 *  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  * THE SOFTWARE.
 *
 */

package de.thingweb.servient.impl;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import de.thingweb.binding.AbstractRESTListener;
import de.thingweb.binding.RESTListener;
import de.thingweb.thing.Content;
import de.thingweb.thing.MediaType;

import java.util.Arrays;
import java.util.List;
import java.util.Observer;

/**
 *  Resource index for Hypermedia-based navigation (HATEOAS)
 */
public class HypermediaIndex extends AbstractRESTListener {

    private static final ObjectWriter ow = new ObjectMapper().writer().withDefaultPrettyPrinter();

    private Content myContent;

    public HypermediaIndex(List<HyperMediaLink> links) {
        myContent = createContent(links);
    }

    public HypermediaIndex(HyperMediaLink... links) {
        myContent = createContent(Arrays.asList(links));
    }

    public static Content createContent(HyperMediaLink... links) {
        return createContent(Arrays.asList(links));
    }

    public static Content createContent(List<HyperMediaLink> links) {
        String json = null;
        try {
            json = ow.writeValueAsString(links);
        } catch (JsonProcessingException e) {
            json = "{ \"error\" : \" " + e.getMessage() + "\"  }";
        }
        return new Content(json.getBytes(), MediaType.APPLICATION_JSON);
    }

    @Override
    public Content onGet() throws RuntimeException {
        return myContent;
    }
}