[英]Lucene : How to get LongField from index
I add a LongField into index. 我将LongField添加到索引中。
The method 方法
IndexSearcher.doc()
returns a document, within which all fields are either 返回一个文档,其中所有字段都是
org.apache.lucene.document.Field or org.apache.lucene.document.StoredField
org.apache.lucene.document.Field或org.apache.lucene.document.StoredField
How do I get a document from index with same field type as I put into. 如何从索引中获取与我输入的字段类型相同的文档。 So then I copy this document to another index with the same field type.
因此,然后将此文档复制到具有相同字段类型的另一个索引。
At last , I find another method IndexSearcher.doc(int, StoredFieldVisitor)
(I am using lucene 4.3) 最后,我找到了另一个方法
IndexSearcher.doc(int, StoredFieldVisitor)
(我正在使用IndexSearcher.doc(int, StoredFieldVisitor)
4.3)
And create a custom StoredFieldVisitor
并创建一个自定义的StoredFieldVisitor
public class StaySameFieldVisitor extends DocumentStoredFieldVisitor {
@Override
public void intField(FieldInfo fieldInfo, int value) {
getDocument().add(new IntField(fieldInfo.name, value, Store.YES));
}
@Override
public void longField(FieldInfo fieldInfo, long value) {
getDocument().add(new LongField(fieldInfo.name, value, Store.YES));
}
@Override
public void doubleField(FieldInfo fieldInfo, double value) {
getDocument().add(new DoubleField(fieldInfo.name, value, Store.YES));
}
@Override
public void floatField(FieldInfo fieldInfo, float value) {
getDocument().add(new FloatField(fieldInfo.name, value, Store.YES));
}
} }
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