Example usage for org.springframework.hateoas Link REL_FIRST

Introduction

In this page you can find the example usage for org.springframework.hateoas Link REL_FIRST.

Prototype

LinkRelation REL_FIRST

To view the source code for org.springframework.hateoas Link REL_FIRST.

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Usage

From source file:org.lareferencia.backend.rest.PageResource.java

public PageResource(Page<T> page, String pageParam, String sizeParam) {
    super();// ww w.ja  v  a2s  .com
    this.page = page;
    if (page.hasPrevious()) {
        String path = createBuilder().queryParam(pageParam, page.getNumber() - 1)
                .queryParam(sizeParam, page.getSize()).build().toUriString();
        Link link = new Link(path, Link.REL_PREVIOUS);
        add(link);
    }
    if (page.hasNext()) {
        String path = createBuilder().queryParam(pageParam, page.getNumber() + 1)
                .queryParam(sizeParam, page.getSize()).build().toUriString();
        Link link = new Link(path, Link.REL_NEXT);
        add(link);
    }

    Link link = buildPageLink(pageParam, 0, sizeParam, page.getSize(), Link.REL_FIRST);
    add(link);

    int indexOfLastPage = page.getTotalPages() - 1;
    link = buildPageLink(pageParam, indexOfLastPage, sizeParam, page.getSize(), Link.REL_LAST);
    add(link);

    link = buildPageLink(pageParam, page.getNumber(), sizeParam, page.getSize(), Link.REL_SELF);
    add(link);
}

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From source file:de.escalon.hypermedia.spring.hydra.PagedResourcesSerializer.java

@Override
public void serialize(PagedResources pagedResources, JsonGenerator jgen, SerializerProvider serializerProvider)
        throws IOException {

    final SerializationConfig config = serializerProvider.getConfig();
    JavaType javaType = config.constructType(pagedResources.getClass());

    JsonSerializer<Object> serializer = BeanSerializerFactory.instance.createSerializer(serializerProvider,
            javaType);//from  w  ww .  j av  a  2 s . c  o m

    // replicate pretty much everything from JacksonHydraSerializer
    // since we must reorganize the internals of pagedResources to get a hydra collection
    // with partial page view, we have to serialize pagedResources with an
    // unwrapping serializer
    Deque<LdContext> contextStack = (Deque<LdContext>) serializerProvider.getAttribute(KEY_LD_CONTEXT);
    if (contextStack == null) {
        contextStack = new ArrayDeque<LdContext>();
        serializerProvider.setAttribute(KEY_LD_CONTEXT, contextStack);
    }

    // TODO: filter next/previous/first/last from link list - maybe create new PagedResources without them?
    List<Link> links = pagedResources.getLinks();
    List<Link> filteredLinks = new ArrayList<Link>();
    for (Link link : links) {
        String rel = link.getRel();
        if (navigationRels.contains(rel)) {
            continue;
        } else {
            filteredLinks.add(link);
        }
    }

    PagedResources toRender = new PagedResources(pagedResources.getContent(), pagedResources.getMetadata(),
            filteredLinks);

    jgen.writeStartObject();

    serializeContext(toRender, jgen, serializerProvider, contextStack);

    jgen.writeStringField(JsonLdKeywords.AT_TYPE, "hydra:Collection");

    // serialize with PagedResourcesMixin
    serializer.unwrappingSerializer(NameTransformer.NOP).serialize(toRender, jgen, serializerProvider);

    PagedResources.PageMetadata metadata = pagedResources.getMetadata();
    jgen.writeNumberField("hydra:totalItems", metadata.getTotalElements());

    // begin hydra:view
    jgen.writeObjectFieldStart("hydra:view");
    jgen.writeStringField(JsonLdKeywords.AT_TYPE, "hydra:PartialCollectionView");
    writeRelLink(pagedResources, jgen, Link.REL_NEXT);
    writeRelLink(pagedResources, jgen, "previous");
    // must also translate prev to its synonym previous
    writeRelLink(pagedResources, jgen, Link.REL_PREVIOUS, "previous");
    writeRelLink(pagedResources, jgen, Link.REL_FIRST);
    writeRelLink(pagedResources, jgen, Link.REL_LAST);
    jgen.writeEndObject();
    // end hydra:view

    jgen.writeEndObject();

    contextStack = (Deque<LdContext>) serializerProvider.getAttribute(KEY_LD_CONTEXT);
    if (!contextStack.isEmpty()) {
        contextStack.pop();
    }

}

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