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Google Guava Extensions to the HalBuilder Library
There is a newer version: 4.1.2
package com.theoryinpractise.halbuilder.guava;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.theoryinpractise.halbuilder.api.Link;
import com.theoryinpractise.halbuilder.api.ReadableRepresentation;
import com.theoryinpractise.halbuilder.api.Representation;
import com.theoryinpractise.halbuilder.api.RepresentationException;
import com.theoryinpractise.halbuilder.impl.bytecode.InterfaceContract;
import com.theoryinpractise.halbuilder.impl.bytecode.InterfaceRenderer;

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

public class Representations {
    /**
     * Add a link to this resource
     *
     * @param rel
     * @param href The target href for the link, relative to the href of this resource.
     */
    public static void withLink(Representation representation, String rel, String href, Predicate predicate) {
        withLink(representation, rel, href,
                 Optional.of(predicate),
                 Optional.absent(),
                 Optional.absent(),
                 Optional.absent(),
                 Optional.absent());
    }

    /**
     * Add a link to this resource
     *
     * @param rel
     * @param uri The target URI for the link, possibly relative to the href of this resource.
     */
    public static void withLink(Representation representation, String rel, URI uri, Predicate predicate) {
        withLink(representation, rel, uri.toASCIIString(), predicate);
    }

    /**
     * Add a link to this resource
     *
     * @param rel
     * @param href The target href for the link, relative to the href of this resource.
     */
    public static void withLink(Representation representation, String rel, String href, Optional> predicate, Optional name, Optional title, Optional hreflang, Optional profile) {
        if (predicate.or(Predicates.alwaysTrue()).apply(representation)) {
            representation.withLink(rel, href, name.orNull(), title.orNull(), hreflang.orNull(), profile.orNull());
        }
    }

    /**
     * Add a link to this resource
     *
     * @param rel
     * @param uri The target URI for the link, possibly relative to the href of this resource.
     */
    public static void withLink(Representation representation, String rel, URI uri, Optional> predicate, Optional name, Optional title, Optional hreflang, Optional profile) {
        withLink(representation, rel, uri.toASCIIString(), predicate, name, title, hreflang, profile);
    }

    public static Optional tryResourceLink(ReadableRepresentation representation) {
        return Optional.fromNullable(representation.getResourceLink());
    }

    public static Optional tryLinkByRel(ReadableRepresentation representation, String rel) {
        return Optional.fromNullable(representation.getLinkByRel(rel));
    }

    /**
     * Returns all embedded resources from the Representation that match the predicate
     *
     * @param predicate The predicate to check against in the embedded resources
     * @return A List of matching objects (properties, links, resource)
     */
    List getResources(ReadableRepresentation representation,
                                                        Predicate predicate) {
        throw new UnsupportedOperationException("not implemented yet");
    }

    /**
     * Returns a property from the Representation.
     *
     * @param name The property to return
     * @return A Guava Optional for the property
     */
    public static Optional