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use Result;
use core::Segment;
use core::SegmentId;
use core::SegmentComponent;
use std::sync::RwLock;
use common::HasLen;
use core::SegmentMeta;
use fastfield::{self, FastFieldNotAvailableError};
use fastfield::DeleteBitSet;
use store::StoreReader;
use directory::ReadOnlySource;
use schema::Document;
use DocId;
use std::sync::Arc;
use std::collections::HashMap;
use common::CompositeFile;
use std::fmt;
use core::InvertedIndexReader;
use schema::Field;
use schema::FieldType;
use error::ErrorKind;
use termdict::TermDictionaryImpl;
use fastfield::FacetReader;
use fastfield::{FastFieldReader, U64FastFieldReader};
use schema::Schema;
use termdict::TermDictionary;
use fastfield::MultiValueIntFastFieldReader;
#[derive(Clone)]
pub struct SegmentReader {
inv_idx_reader_cache: Arc<RwLock<HashMap<Field, Arc<InvertedIndexReader>>>>,
segment_id: SegmentId,
segment_meta: SegmentMeta,
termdict_composite: CompositeFile,
postings_composite: CompositeFile,
positions_composite: CompositeFile,
fast_fields_composite: CompositeFile,
fieldnorms_composite: CompositeFile,
store_reader: StoreReader,
delete_bitset: DeleteBitSet,
schema: Schema,
}
impl SegmentReader {
pub fn max_doc(&self) -> DocId {
self.segment_meta.max_doc()
}
pub fn num_docs(&self) -> DocId {
self.segment_meta.num_docs()
}
pub fn num_deleted_docs(&self) -> DocId {
self.delete_bitset.len() as DocId
}
pub fn get_fast_field_reader<TFastFieldReader: FastFieldReader>(
&self,
field: Field,
) -> fastfield::Result<TFastFieldReader> {
let field_entry = self.schema.get_field_entry(field);
if !TFastFieldReader::is_enabled(field_entry.field_type()) {
Err(FastFieldNotAvailableError::new(field_entry))
} else {
self.fast_fields_composite
.open_read(field)
.ok_or_else(|| FastFieldNotAvailableError::new(field_entry))
.map(TFastFieldReader::open)
}
}
pub fn facet_reader(&self, field: Field) -> Result<FacetReader> {
let field_entry = self.schema.get_field_entry(field);
if field_entry.field_type() != &FieldType::HierarchicalFacet {
return Err(ErrorKind::InvalidArgument(format!(
"The field {:?} is not a \
hierarchical facet.",
field_entry
)).into());
}
let term_ords_reader = self.multi_value_reader(field)?;
let termdict_source = self.termdict_composite.open_read(field).ok_or_else(|| {
ErrorKind::InvalidArgument(format!(
"The field \"{}\" is a hierarchical \
but this segment does not seem to have the field term \
dictionary.",
field_entry.name()
))
})?;
let termdict = TermDictionaryImpl::from_source(termdict_source);
let facet_reader = FacetReader::new(term_ords_reader, termdict);
Ok(facet_reader)
}
pub fn multi_value_reader(&self, field: Field) -> Result<MultiValueIntFastFieldReader> {
let field_entry = self.schema.get_field_entry(field);
let idx_reader = self.fast_fields_composite
.open_read_with_idx(field, 0)
.ok_or_else(|| FastFieldNotAvailableError::new(field_entry))
.map(U64FastFieldReader::open)?;
let vals_reader = self.fast_fields_composite
.open_read_with_idx(field, 1)
.ok_or_else(|| FastFieldNotAvailableError::new(field_entry))
.map(U64FastFieldReader::open)?;
Ok(MultiValueIntFastFieldReader::open(idx_reader, vals_reader))
}
pub fn get_fieldnorms_reader(&self, field: Field) -> Option<U64FastFieldReader> {
self.fieldnorms_composite
.open_read(field)
.map(U64FastFieldReader::open)
}
pub fn get_store_reader(&self) -> &StoreReader {
&self.store_reader
}
pub fn open(segment: &Segment) -> Result<SegmentReader> {
let termdict_source = segment.open_read(SegmentComponent::TERMS)?;
let termdict_composite = CompositeFile::open(&termdict_source)?;
let store_source = segment.open_read(SegmentComponent::STORE)?;
let store_reader = StoreReader::from_source(store_source);
let postings_source = segment.open_read(SegmentComponent::POSTINGS)?;
let postings_composite = CompositeFile::open(&postings_source)?;
let positions_composite = {
if let Ok(source) = segment.open_read(SegmentComponent::POSITIONS) {
CompositeFile::open(&source)?
} else {
CompositeFile::empty()
}
};
let fast_fields_data = segment.open_read(SegmentComponent::FASTFIELDS)?;
let fast_fields_composite = CompositeFile::open(&fast_fields_data)?;
let fieldnorms_data = segment.open_read(SegmentComponent::FIELDNORMS)?;
let fieldnorms_composite = CompositeFile::open(&fieldnorms_data)?;
let delete_bitset = if segment.meta().has_deletes() {
let delete_data = segment.open_read(SegmentComponent::DELETE)?;
DeleteBitSet::open(delete_data)
} else {
DeleteBitSet::empty()
};
let schema = segment.schema();
Ok(SegmentReader {
inv_idx_reader_cache: Arc::new(RwLock::new(HashMap::new())),
segment_meta: segment.meta().clone(),
termdict_composite,
postings_composite,
fast_fields_composite,
fieldnorms_composite,
segment_id: segment.id(),
store_reader,
delete_bitset,
positions_composite,
schema,
})
}
pub fn inverted_index(&self, field: Field) -> Arc<InvertedIndexReader> {
if let Some(inv_idx_reader) = self.inv_idx_reader_cache
.read()
.expect("Lock poisoned. This should never happen")
.get(&field)
{
return Arc::clone(inv_idx_reader);
}
let termdict_source: ReadOnlySource = self.termdict_composite
.open_read(field)
.expect("Index corrupted. Failed to open field term dictionary in composite file.");
let postings_source = self.postings_composite
.open_read(field)
.expect("Index corrupted. Failed to open field postings in composite file.");
let positions_source = self.positions_composite
.open_read(field)
.expect("Index corrupted. Failed to open field positions in composite file.");
let inv_idx_reader = Arc::new(InvertedIndexReader::new(
termdict_source,
postings_source,
positions_source,
self.delete_bitset.clone(),
self.schema.clone(),
));
self.inv_idx_reader_cache
.write()
.expect("Field reader cache lock poisoned. This should never happen.")
.insert(field, Arc::clone(&inv_idx_reader));
inv_idx_reader
}
pub fn doc(&self, doc_id: DocId) -> Result<Document> {
self.store_reader.get(doc_id)
}
pub fn segment_id(&self) -> SegmentId {
self.segment_id
}
pub fn delete_bitset(&self) -> &DeleteBitSet {
&self.delete_bitset
}
pub fn is_deleted(&self, doc: DocId) -> bool {
self.delete_bitset.is_deleted(doc)
}
}
impl fmt::Debug for SegmentReader {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "SegmentReader({:?})", self.segment_id)
}
}