0

Lucene中,我正在使用TaxonomyReader读取存储在磁盘中的分类索引。对于给定的类别,我需要找到所有属于其子类别的类别。但是,在Lucene 的 API中,我可以找到一种方法来检索父级而不是子级。有一个称为getChildrenArrays()返回ChildrenArrays对象的方法。可以看到,这个类只有两个方法:

  • getYoungestChildArray
  • getOlderSiblingArray

我想Enumerator使用这两种方法来实现。有人知道该怎么做吗?

4

1 回答 1

0

我得到以下信息:

private class EnumChildren implements Enumeration<Integer> {
    int category, current;
    int[] next, first;

    public EnumChildren(int category) {
        ChildrenArrays childrenArrays = tr.getChildrenArrays();
        first = childrenArrays.getYoungestChildArray(); 
        next = childrenArrays.getOlderSiblingArray();
        current = first[category];
    }

    public boolean hasChildren() {
        return (current != TaxonomyReader.INVALID_ORDINAL);
    }

    @Override
    public boolean hasMoreElements() {  
        current = next[current];
        return (current != TaxonomyReader.INVALID_ORDINAL);
    }

    @Override
    public Integer nextElement() {
        return current;
    }
}

Ans 用作:

ordinal = tr.getOrdinal(new CategoryPath(nodeCategory.getPath(), '/')); 
        EnumChildren childrenEnumeration = new EnumChildren(ordinal);
        if (childrenEnumeration.hasChildren()) {
            do {
                int current = childrenEnumeration.nextElement();
                Category child = new Category(tr.getPath(current).toString());
                addChildren(child);
                nodeCategory.children.add(child);
            } while (childrenEnumeration.hasMoreElements());
        }
于 2012-10-09T16:52:33.560 回答