如何将变量从java传递到turtle文件？

Question

我有一个具有以下结构的项目：

-config
  -repositories
    -test-repo.ttl

test-repo.ttl 文件如下所示：

@prefix lookup: <http://www.metaphacts.com/ontologies/platform/repository/lookup#> .
@prefix pathfinder: <http://www.metaphacts.com/ontologies/platform/service/pathfinder/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rep: <http://www.openrdf.org/config/repository#> .
@prefix sail: <http://www.openrdf.org/config/sail#> .
@prefix sr: <http://www.openrdf.org/config/repository/sail#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix mph: <http://www.metaphacts.com/ontologies/platform/repository#> .
@prefix ephedra: <http://www.metaphacts.com/ontologies/platform/ephedra#> .
@prefix fedsail: <http://www.openrdf.org/config/sail/federation#> .
@prefix sparqlr: <http://www.openrdf.org/config/repository/sparql#> .

[] a rep:Repository;
  rep:repositoryID "test-repo";
  rdfs:label "Repository to access data.";
  rep:repositoryImpl [
      rep:repositoryType "openrdf:SailRepository";
      sr:sailImpl [
          sail:sailType "metaphacts:RESTService";
          ephedra:serviceURL "https://request-to-access-data.com";
          ephedra:implementsService ephedra:test-ephedra;
          ephedra:httpMethod "GET";
          ephedra:httpHeader [
              ephedra:name "Authorization";
              ephedra:value "my_secret_token"
            ]
        ]
    ] .

每次运行项目时，字符串 my_secret_token 都会发生变化，因此我需要从 java 文件输入其值。我是java的绝对初学者。是否可以有一个 java 文件，在其中创建 my_secret_token 变量并为其分配值“123”，然后将该值传递给海龟文件中的 ephedra:value 字段？

如果是这样，你能帮助我实现这一目标吗？

Answer 1

我不确定我完全理解你想要做什么，但如果纯粹是为了更改 Turtle 文件中的文字字符串，我想一种简单的方法是将文件读入内存中的 RDf 模型，更改值，然后再次将模型写回文件。像这样的东西（未经测试，但希望它给出了总体思路）：

// read the file into an RDF4J Model
Model model = Rio.parse("/path/to/test-repo.ttl", RDFFormat.TURTLE);

// create an IRI object for the 'ephedra:value' property
IRI ephedraValue = Values.iri("http://www.metaphacts.com/ontologies/platform/ephedra#value");

// find the statement in the RDF model we want to change the object of
model.getStatements(null, ephedraValue, null)
   .forEach(st -> {
        Value object = st.getObject();
        if (object.isLiteral()) { 
            // remove the old value
            model.remove(st);
            Literal newObject = Values.literal("my_NEW_secret_token");
            // add the new value
            model.add(st.getSubject, ephedraValue, newObject());
        }
);
// write modified model to file
Rio.write(model, new FileOutputStream("/path/to/file.ttle"), RDFFormat.TURTLE);