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Stratumn services SDK
There is a newer version: 0.0.8
package com.stratumn.sdk;

import com.stratumn.sdk.model.account.*;
import com.stratumn.sdk.model.trace.*;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.stratumn.chainscript.*;

public class Sdk implements ISdk {

  private ISerializer serializer;

  public void setSerializer(ISerializer s) {
    this.serializer = s;
  }

  private SdkOptions opts;
  private SdkConfig config;

  // This is temporary until we plug the SDK to the APIs.
  private TState getMockState() {
    return this.serializer.deserialize(null);
  }

  public Sdk(SdkOptions opts) {
    this.opts = opts;

    this.pingTrace();
  }

  private void pingTrace() {
    HttpResponse response;
    try {
      // ping trace to test network connectivity.
      HttpClient client = HttpClient.newHttpClient();
      String url = String.format("%s/healthz", this.opts.endpoints.trace);
      HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).build();
      response = client.send(request, BodyHandlers.ofString());
    } catch (Exception e) {
      System.err.print("Could not call Trace");
      e.printStackTrace();
      return;
    }

    if (response.statusCode() != 200) {
      System.out.printf("Could not call Trace (%d)\n", response.statusCode());
    }

    System.out.println("================================================================================");
    System.out.println("                    Connection to trace established                             ");
    System.out.println("================================================================================");
  }

  @Override
  public  TraceState newTrace(NewTraceInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public  TraceState appendLink(AppendLinkInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public  TraceState pushTrace(PushTransferInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public  TraceState pullTrace(PullTransferInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public  TraceState acceptTransfer(TransferResponseInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public  TraceState rejectTransfer(TransferResponseInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public  TraceState cancelTransfer(TransferResponseInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public TraceState getTraceState(GetTraceStateInput input) {
    return new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(),
        this.getMockState());
  }

  @Override
  public TraceDetails getTraceDetails(GetTraceDetailsInput input) {
    throw new UnsupportedOperationException("Not implemented yet");
  }

  @Override
  public TracesState getIncomingTraces(PaginationInfo paginationInfo) {
    List> res = new ArrayList>();
    res.add(
        new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(), this.getMockState()));
    return new TracesState(res);
  }

  @Override
  public TracesState getOutgoingTraces(PaginationInfo paginationInfo) {
    List> res = new ArrayList>();
    res.add(
        new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(), this.getMockState()));
    return new TracesState(res);
  }

  @Override
  public TracesState getBacklogTraces(PaginationInfo paginationInfo) {
    List> res = new ArrayList>();
    res.add(
        new TraceState("trace ID", new TraceLink(new Link()), new Date(), new Account(), this.getMockState()));
    return new TracesState(res);
  }

}