How to use org.raml.parser.rule

private ScalarNode getGlobalSchemaNode(String key)
{
  GlobalSchemasRule schemasRule = (GlobalSchemasRule) getRootTupleRule().getRuleByFieldName("schemas");
  if (schemasRule == null) return null;
  return schemasRule.getSchema(key);
}

@Override
public NodeRule<?> getItemRule()
{
  return new GlobalSchemaTupleRule(String.class, getNodeRuleFactory());
}

  private TupleRule<?, ?> createInstanceOfTupleRule(Class<? extends TupleRule> rule, String fieldName, Type valueType)
  {
    TupleRule tupleRule = createInstanceOf(rule);
    tupleRule.setName(fieldName);
    tupleRule.setValueType(valueType);
    tupleRule.setNodeRuleFactory(this);
    return tupleRule;
  }
}

@Override
public List<ValidationResult> validateKey(ScalarNode key)
{
  List<ValidationResult> validationResults = super.validateKey(key);
  if (wasAlreadyDefined())
  {
    validationResults.add(ValidationResult.createErrorResult(getDuplicateRuleMessage(getName()), key));
  }
  setKeyNode(key);
  return validationResults;
}

@Override
public List<ValidationResult> validateKey(ScalarNode key)
{
  List<ValidationResult> validationResults = super.validateKey(key);
  if (getParentTupleRule() instanceof MapTupleRule)
  {
    ((MapTupleRule)getParentTupleRule()).checkDuplicate(key, validationResults);
  }
  return validationResults;
}

@Override
protected DefaultTupleRule getScalarRule()
{
  return new SimpleNullAllowedRule(getName(), (Class<?>) getItemType());
}

protected DefaultTupleRule getScalarRule()
{
  return new SimpleRule(getFieldName(), getValueType());
}

@Override
public NodeRule<?> getItemRule()
{
  return new SecurityReferenceRule(getNodeRuleFactory());
}

protected DefaultTupleRule getScalarRule()
{
  return new SimpleRule(getName(), (Class<?>) itemType);
}

public BaseUriRule getUriRule()
{
  return (BaseUriRule) getRootTupleRule().getRuleByFieldName("baseUri");
}

public SimpleRule getVersionRule()
{
  return (SimpleRule) getParentTupleRule().getRuleByFieldName("version");
}

@Override
public List<ValidationResult> validateKey(ScalarNode key)
{
  List<ValidationResult> validationResults = super.validateKey(key);
  if (wasAlreadyDefined())
  {
    validationResults.add(ValidationResult.createErrorResult(getDuplicateRuleMessage(getName()), key));
  }
  setKeyNode(key);
  return validationResults;
}

  private TupleRule<?, ?> createInstanceOfTupleRule(Class<? extends TupleRule> rule, String fieldName, Type valueType)
  {
    TupleRule tupleRule = createInstanceOf(rule);
    tupleRule.setName(fieldName);
    tupleRule.setValueType(valueType);
    tupleRule.setNodeRuleFactory(this);
    return tupleRule;
  }
}

private ScalarNode getGlobalSchemaNode(String key)
{
  GlobalSchemasRule schemasRule = (GlobalSchemasRule) getRootTupleRule().getRuleByFieldName("schemas");
  //HYBRIS start
  if(schemasRule==null){
    return null;
  }
  //HYBRIS end
  return schemasRule.getSchema(key);
}

@Override
public List<ValidationResult> validateKey(ScalarNode key)
{
  List<ValidationResult> validationResults = super.validateKey(key);
  if (getParentTupleRule() instanceof MapTupleRule)
  {
    ((MapTupleRule)getParentTupleRule()).checkDuplicate(key, validationResults);
  }
  return validationResults;
}

@Override
protected DefaultTupleRule getScalarRule()
{
  return new SimpleNullAllowedRule(getName(), (Class<?>) getItemType());
}

@Override
public NodeRule<?> getItemRule()
{
  return new GlobalSchemaTupleRule(String.class, getNodeRuleFactory());
}

@Override
public NodeRule<?> getItemRule()
{
  return new SecurityReferenceRule(getNodeRuleFactory());
}

protected DefaultTupleRule getScalarRule()
{
  return new SimpleRule(getName(), (Class<?>) itemType);
}

public BaseUriRule getUriRule()
{
  return (BaseUriRule) getRootTupleRule().getRuleByFieldName("baseUri");
}