Resource.java

package co.gem.round.patchboard;

import co.gem.round.patchboard.definition.ActionSpec;
import co.gem.round.patchboard.definition.ResourceSpec;
import co.gem.round.patchboard.definition.SchemaSpec;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Created by julian on 11/26/14.
 */
public class Resource implements Iterable<Resource>{
    static final String URL = "url";

    private String url;
    private Client client;
    private ResourceSpec resourceSpec;
    private JsonObject attributes;
    private List<Resource> resourceList;

    protected Resource(String url, ResourceSpec resourceSpec, Client client) {
        this.url = url;
        this.resourceSpec = resourceSpec;
        this.client = client;
    }

    protected Resource(JsonObject attributes, ResourceSpec resourceSpec, Client client) {
        this((String)null, resourceSpec, client);
        if (attributes.has(URL)) {
            this.url = attributes.get(URL).getAsString();
        }

        this.attributes = attributes;
    }

    protected Resource(JsonObject attributes, List<Resource> resourceList, ResourceSpec resourceSpec, Client client) {
        this(attributes, resourceSpec, client);
        this.resourceList = resourceList;
    }

    public Resource subresource(String name) throws IOException, Client.UnexpectedStatusCodeException {
        return subresource(name, null);
    }

    public Resource subresource(String name, Map<String, String> query) throws
            IOException, Client.UnexpectedStatusCodeException {
        if (attributes.has(name)) {
            String url = attributes.get(name).getAsJsonObject()
                    .get(URL).getAsString();
            String schemaId = resourceSpec.schemaSpec().associationSchemaId(name);
            return client.resources(name, url, schemaId, query);
        }
        return null;
    }

    public Resource action(String name)
            throws IOException, Client.UnexpectedStatusCodeException {
        return action(name, null);
    }

    public Resource action(String name, JsonElement payload)
            throws IOException, Client.UnexpectedStatusCodeException {
        ActionSpec actionSpec = resourceSpec.action(name);

        JsonElement response = client.performRequest(url, actionSpec, payload);
        String responseMediaType = actionSpec.response().type();
        SchemaSpec responseSchema = client.definition().schemaByMediaType(responseMediaType);
        if (responseSchema.type() != null && responseSchema.type().equals("array")) {
            resourceList = new ArrayList<Resource>();
            JsonArray jsonArray = response.getAsJsonArray();
            for (JsonElement element : jsonArray) {
                JsonObject attributes = element.getAsJsonObject();
                Resource resource = new Resource(attributes, responseSchema.arrayResource(), client);
                resourceList.add(resource);
            }
            return this;
        } else {
            return new Resource(response.getAsJsonObject(), responseSchema.resourceSpec(), client);
        }

    }

    public JsonObject attributes() {
        if (attributes == null)
            attributes = new JsonObject();
        return attributes;
    }
    public String url() {
        return url;
    }

    @Override
    public Iterator<Resource> iterator() {
        return resourceList.iterator();
    }
}