java - 自定义插件无法通过 QuerySpec 构造函数推断

Question

我尝试将我的自定义插件从ES5.5升级到ES6.3。 在 ES5.5 中我自己的插件运行良好。但在 ES6.3 中，QuerySpec 构造函数无法推断它。 以下是 ES6.3 中的代码片段:

1. AbstractVectorQuery

public abstract class AbstractVectorQuery extends Query
{
    protected String field;
    protected float[] qVector;
    protected VectorFieldType vectorFieldType;
    protected DistanceMeasure distHelper;

    protected AbstractVectorQuery(String field, float[] qVector, DistanceMeasure distHelper, VectorFieldType fieldType)
    {
        this.field = field;
        this.qVector = qVector;
        this.distHelper = distHelper;
        this.vectorFieldType = fieldType;
    }
}

VectorIterQuery

public class VectorIterQuery extends AbstractVectorQuery
{
    public VectorIterQuery(String field, float[] vector, DistanceMeasure distHelper, VectorFieldType vectorFieldType)
    {
        super(field, vector, distHelper, vectorFieldType);
    }
}

DistanceVectorQueryBuilder

public abstract class DistanceVectorQueryBuilder<T extends DistanceVectorQueryBuilder<T>>
    extends AbstractVectorQueryBuilder<T>
{
    public static final DistanceType DEFAULT_DISTANCE_TYPE = DistanceType.L2;
    protected DistanceType distanceType = DEFAULT_DISTANCE_TYPE;

    protected abstract void innerInnerDoXContent(XContentBuilder builder, Params params) throws IOException;

    protected DistanceVectorQueryBuilder(){}

    protected DistanceVectorQueryBuilder(StreamInput in) throws IOException
    {
        super(in);
        this.distanceType = in.readEnum(DistanceType.class);
    }
}

IterVectorQueryBuilder

public class IterVectorQueryBuilder extends DistanceVectorQueryBuilder<IterVectorQueryBuilder>
{
    public static final String QUERY_NAME = "iter";

    public IterVectorQueryBuilder(StreamInput input) throws IOException
    {
        super(input);
    }
}

vector 插件
这里，IDE 报告:
无法推断参数(无法解析构造函数)

public class VectorPlugin extends Plugin implements MapperPlugin, SearchPlugin
{
    @Override
    public List<QuerySpec<?>> getQueries()
    {
        List<QuerySpec<?>> list = new ArrayList<>();

        QuerySpec<IterVectorQueryBuilder> iterQuery = new QuerySpec<>(
                IterVectorQueryBuilder.QUERY_NAME,
                IterVectorQueryBuilder::new,
                IterVectorQueryBuilder::fromXContent
        );
        list.add(iterQuery);
    }
}

如有任何建议，我们将不胜感激。

Answer 1

已解决，实际上我发布的代码片段中并不存在该问题，抱歉造成误解。

更改 IterVectorQueryBuilder::fromXContent 的返回类型 来自

Optional<IterVectorQueryBuilder> fromXContent(QueryParseContext parseContext) throws IOException { ... }

到

IterVectorQueryBuilder fromXContent(QueryParseContext parseContext) throws IOException { ... }  

可以解决这个问题。