Hospital.sol

pragma solidity ^0.4.17;

import './MedicalRecord.sol';

contract Hospital {
  MedicalRecord public medicalRecord;

  struct Patient {
    bytes32 fullName;
    bool access;
  }

  mapping(bytes32 => Patient) patients;

  modifier onlyIfGrantedAccess(bytes32 _fullName) {
    require(patients[_fullName].access);
    _;
  }

  function Hospital(address _contract) public {
    medicalRecord = MedicalRecord(_contract);
  }

  function addPatient(bytes32 _fullName, bool _access) public  {
    patients[_fullName].fullName = _fullName;
    patients[_fullName].access = _access;
  }

  function enterHospital(bytes32 _fullName)  public {
    medicalRecord.addAdmissionRecord(_fullName);
  }

  function leaveHospital(bytes32 _fullName)  public {
    medicalRecord.addDischargeRecord(_fullName);
  }

  function patientExist(bytes32 _fullName)  
  onlyIfGrantedAccess(_fullName)
  view public returns (bool) {
    return medicalRecord.recordExist(_fullName);
  }
}

MedicalRecord.sol

pragma solidity ^0.4.17;

contract MedicalRecord {
  enum Symptoms {ChestPain, HeadAche, Vomiting, Sprain, Fractures}

  struct Visit {
    Symptoms symptoms;
    uint256 admissionDate;
    uint256 dischargeDate;
  }

  mapping(address => mapping(bytes32 => Visit)) visits;

  function addAdmissionRecord(bytes32 _fullName, Symptoms _symptoms) external {
    visits[msg.sender][_fullName].symptoms = _symptoms;
    visits[msg.sender][_fullName].admissionDate = now;
  }

  function addDischargeRecord(bytes32 _fullName) external {
   visits[msg.sender][_fullName].dischargeDate = now;
  }

  function recordExist(bytes32 _fullName) view external returns (bool) {
    return visits[msg.sender][_fullName].admissionDate != 0;
  }
}