本文整理了Java中org.apache.jena.query.Query.getDatasetDescription方法的一些代码示例，展示了Query.getDatasetDescription的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Query.getDatasetDescription方法的具体详情如下：
包路径：org.apache.jena.query.Query
类名称：Query
方法名：getDatasetDescription

Query.getDatasetDescription介绍

[英]Return a dataset description (FROM/FROM NAMED clauses) for the query.
[中]返回查询的数据集描述（来自/来自命名子句）。

代码示例

代码示例来源：origin: stackoverflow.com

Query query = QueryFactory.create(queryString);
query.isSelectType() && query.isQueryResultStar(); // of the form SELECT *?
query.getDatasetDescription(); // FROM / FROM NAMED bits
query.getQueryPattern(); // The meat of the query, the WHERE bit
...etc etc..
Op op = Algebra.compile(query); // Get the algebra for the query

代码示例来源：origin: apache/jena

/** Create a dataset description, given a query and context.
 * The context overrides the query FROM/FROM NAMED.
 * If neither the context nor query has a dataset description, return null.
 * The context uses the key {@link ARQConstants#sysDatasetDescription}.
 */
public static DatasetDescription create(Query query, Context context)
{
  if ( context != null && context.isDefined(ARQConstants.sysDatasetDescription) )
  {
    try {
      return (DatasetDescription)context.get(ARQConstants.sysDatasetDescription) ;
    } catch (ClassCastException ex)
    {
      throw new ARQException("Unexpected type (expected DatasetDescription): "+ex.getMessage()) ;
    }
  }
  
  if ( query != null && query.hasDatasetDescription() )
    return query.getDatasetDescription() ;
  
  return null ;
}

代码示例来源：origin: SmartDataAnalytics/jena-sparql-api

public static Query rewrite(Query query) {
  DatasetDescription dd = query.getDatasetDescription();
  Query result;
  if(dd != null) {
    result = query.cloneQuery();
    Element before = result.getQueryPattern();
    Element after = rewrite(before, dd);
    result.setQueryPattern(after);
  } else {
    result = query;
  }
  return result;
}

代码示例来源：origin: SmartDataAnalytics/jena-sparql-api

public static void applyDatasetDescription(Query query,
    DatasetDescription dd) {
  DatasetDescription present = query.getDatasetDescription();
  if (present == null && dd != null) {
    {
      List<String> items = dd.getDefaultGraphURIs();
      if (items != null) {
        for (String item : items) {
          query.addGraphURI(item);
        }
      }
    }
    {
      List<String> items = dd.getNamedGraphURIs();
      if (items != null) {
        for (String item : items) {
          query.addNamedGraphURI(item);
        }
      }
    }
  }
}

代码示例来源：origin: apache/jena

@Override
public void startVisit(Query query) {
  newQuery.setSyntax(query.getSyntax());
  if (query.explicitlySetBaseURI())
    newQuery.setBaseURI(query.getPrologue().getResolver());
  newQuery.setQueryResultStar(query.isQueryResultStar());
  if (query.hasDatasetDescription()) {
    DatasetDescription desc = query.getDatasetDescription();
    for (String x : desc.getDefaultGraphURIs())
      newQuery.addGraphURI(x);
    for (String x : desc.getDefaultGraphURIs())
      newQuery.addNamedGraphURI(x);
  }
  // Aggregators.
  newQuery.getAggregators().addAll(query.getAggregators());
}

代码示例来源：origin: SmartDataAnalytics/jena-sparql-api

@Override
public void startVisit(Query query) {
  newQuery.setSyntax(query.getSyntax()) ;
  if ( query.explicitlySetBaseURI() )
    newQuery.setBaseURI(query.getPrologue().getResolver()) ;
  newQuery.setQueryResultStar(query.isQueryResultStar()) ;
  if ( query.hasDatasetDescription() ) {
    DatasetDescription desc = query.getDatasetDescription() ;
    for (String x : desc.getDefaultGraphURIs())
      newQuery.addGraphURI(x) ;
    for (String x : desc.getDefaultGraphURIs())
      newQuery.addNamedGraphURI(x) ;
  }
  // Aggregators.
  newQuery.getAggregators().addAll(query.getAggregators()) ;
}