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Serving vGraph Commits.

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package com.github.trepo.dcap.server.rest;

import com.github.trepo.dcap.store.Store;
import com.github.trepo.vgraph.Commit;
import com.github.trepo.vgraph.exception.VGraphException;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

/**
 * Save a commit.
 * @author John Clark.
 */
@Path("/")
public class Put {

    /**
     * Gson instance for serialization/de-serialization.
     */
    private Gson gson = new Gson();

    /**
     * The commit store to use.
     */
    private Store store;

    /**
     * Save a commit to the commit store.
     * @param body The Commit.
     * @return 201 on success.
     */
    @PUT
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Response put(String body) {
        if (body == null) {
            throw new WebApplicationException("JSON Commit body is required", Response.Status.BAD_REQUEST);
        }

        Commit commit;
        try {
            commit = gson.fromJson(body, Commit.class);
        } catch (JsonSyntaxException e) {
            throw new WebApplicationException("Invalid JSON Commit Syntax", e, Response.Status.BAD_REQUEST);
        }

        try {
            commit.validate();
        } catch(VGraphException e) {
            throw new WebApplicationException("Invalid Commit: " + e.getMessage(), e, Response.Status.BAD_REQUEST);
        }

        store.put(commit);

        return Response
                .status(Response.Status.CREATED)
                .build();
    }

    /**
     * Sets the Commit Store to use via Injection.
     * @param commitStore The commit store.
     */
    @Inject
    public void setStore(Store commitStore) {
        store = commitStore;
    }
}