Question

我为websemantic学习jena。我尝试使用getAllSubClass函数来读取本体（.owl）。

level1-＆gt; level2子类level1-＆gt; level3子类level2-＆gt; level4 子类level3-＆gt; level5子类level4

这是我的代码：

public void getAllSubClass(String class)
    {
        String temp = uri+""+class;
        OntClass classOwl = ontology.getOntClass(temp);
        do
        {
            System.out.println(classOwl.getLocalName());
            temp = uri+""+classOwl.getLocalName();
            classOwl = ontology.getOntClass(temp);
            classOwl = classOwl.getSubClass();
        }while(!classOwl.getLocalName().equals((Object)"Nothing"));
    }

如果class level1 / level2 / level3输出总是在level3中停止如果class level4输出level4-level5

我的代码如何获取输出level1 ... level5？

Answer 1

我已经解决了这个问题，我创建了一个JenaHelper类，它解析使用Protege创建的Ontologoy（.owl）文件。我希望，这将帮助您开发用于检索特定概念的所有概念，概念关系，所有值和值的方法。

public class JenaHelper {

    public JenaHelper() {

    }

    public static Set<String> getConceptsNames(Model model, String uri) {
        Set<String> conceptsName = new HashSet<String>();
        StmtIterator sIter = model.listStatements();
        for (; sIter.hasNext();) {
            Statement stmt = sIter.nextStatement();
            String subject = stmt.getSubject().toString();
            String predicat = stmt.getPredicate().toString();
            String object = stmt.getObject().toString();
            if (subject.contains(uri) || predicat.contains(uri) || object.contains(uri)) {
                String s = subject.substring(subject.indexOf("#") + 1);
                String p = predicat.substring(predicat.indexOf("#") + 1);
                String o = object.substring(object.indexOf("#") + 1);
                if ("subClassOf".equals(p) && !s.toLowerCase().equals("thing") && !o.toLowerCase().equals("thing")
                        && !s.contains("/") && !o.contains("/")
                        && !s.contains(":") && !o.contains(":")
                        && !s.contains("-") && !o.contains("-")) {
                    conceptsName.add(s);
                    conceptsName.add(o);
                }
            }
        }
        sIter.close();
        return conceptsName;
    }

    public static Set<String> getValues(Model model, String uri) {
        Set<String> values = new HashSet<String>();
        StmtIterator sIter = model.listStatements();
        for (; sIter.hasNext();) {
            Statement stmt = sIter.nextStatement();
            String subject = stmt.getSubject().toString();
            String predicat = stmt.getPredicate().toString();
            if (subject.contains(uri) || predicat.contains(uri)) {
                String s = subject.substring(subject.indexOf("#") + 1);
                String p = predicat.substring(predicat.indexOf("#") + 1);
                if ("type".equals(p)) {
                    values.add(s);
                }
            }
        }
        sIter.close();
        return values;
    }

    public static Set<String> getValuesOfConcept(Model model, String className, String uri){
        Set<String> valuesConcept = new HashSet<String>();
        StmtIterator sIter = model.listStatements();
        for (; sIter.hasNext();) {
            Statement stmt = sIter.nextStatement();
            String subject = stmt.getSubject().toString();
            String predicat = stmt.getPredicate().toString();
            String object = stmt.getObject().toString();
            if (subject.contains(uri) || predicat.contains(uri) || object.contains(uri)) {
                String s = subject.substring(subject.indexOf("#") + 1);
                String p = predicat.substring(predicat.indexOf("#") + 1);
                String o = object.substring(object.indexOf("#") + 1);
                if (className.equals(o)) {
                    if ("type".equals(p) ) {
                        valuesConcept.add(s);
                    }
                }
            }
        }
        sIter.close();
        return valuesConcept;
    }


    public static String getRelation(Model model, String conceptSource, String conceptDestination, String uri){
        String relationName = "Fail";
        StmtIterator sIter = model.listStatements();
        while(sIter.hasNext()) {
            Statement stmt = sIter.nextStatement();
            String subject = stmt.getSubject().toString();
            String predicat = stmt.getPredicate().toString();
            String object = stmt.getObject().toString();
            if (subject.contains(uri) || predicat.contains(uri) || object.contains(uri)) {
                String s = subject.substring(subject.indexOf("#") + 1);
                String p = predicat.substring(predicat.indexOf("#") + 1);
                String o = object.substring(object.indexOf("#") + 1);

                if (o.equals(conceptSource) && s.equals(conceptDestination)) {
                    relationName = p;
                    break;
                }
            }
        }
        sIter.close();
        return relationName;
    }
}

如果没有实例化，只需调用示例JenaHelper.getConceptsNames("...","...")。祝你好运。

apache-jena-2.12.1：getSubClass无法读取所有子类

1 个答案: