IndexReader.getFieldNames Lucene 4

问题描述

我们正在从这里升级Lucene 3.3.0到Lucene 4.2.1，我似乎无法找到旧的IndexReader.getFieldNames方法的替代品。谷歌搜索提出，其中提到了一个新的IndexReader.getFieldInfos方法，但是是实验性的，似乎不再是 - 这条路很冷。

We're upgrading from Lucene 3.3.0 to Lucene 4.2.1 over here, and I can't seem to find the replacement for the old IndexReader.getFieldNames method. Googling brings up this ticket which speaks of a new IndexReader.getFieldInfos method, but that was experimental and seems to be around no longer - the trail is cold.

如何在Lucene 4中复制IndexReader.getFieldNames的行为？

How can I replicate the behavior of IndexReader.getFieldNames in Lucene 4?

推荐答案

你可以得到，。

类似于：

You can get the FieldInfos with AtomicReader.getFieldInfos().
Something along the lines of:

for (FieldInfo info : atomicReader.getFieldInfos().iterator()) {
    String name = info.name;
    //Whatever you need to do with the name.
}

看一下了解更多信息，有关于IndexReader - > AtomicReader的部分。如果您还不熟悉这一变化，您可能会发现它有用的信息。

Take a look at the Migration Guide for more info, there's a section about IndexReader -> AtomicReader. If you aren't acquainted with that change yet, you'll likely find it useful information.

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