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use std::io;
use std::collections::HashMap;
use std::ops::Deref;
use directory::ReadOnlySource;
use common::BinarySerializable;
use DocId;
use schema::{Field, SchemaBuilder};
use std::path::Path;
use schema::FAST;
use directory::{WritePtr, RAMDirectory, Directory};
use fastfield::FastFieldSerializer;
use fastfield::U32FastFieldsWriter;
use super::compute_num_bits;
lazy_static! {
static ref U32_FAST_FIELD_EMPTY: ReadOnlySource = {
let u32_fast_field = U32FastFieldReader::from(Vec::new());
u32_fast_field._data.clone()
};
}
pub struct U32FastFieldReader {
_data: ReadOnlySource,
data_ptr: *const u8,
min_val: u32,
max_val: u32,
num_bits: u32,
mask: u32,
}
impl U32FastFieldReader {
pub fn empty() -> U32FastFieldReader {
U32FastFieldReader::open(U32_FAST_FIELD_EMPTY.clone()).expect("should always work.")
}
pub fn min_val(&self,) -> u32 {
self.min_val
}
pub fn max_val(&self,) -> u32 {
self.max_val
}
pub fn open(data: ReadOnlySource) -> io::Result<U32FastFieldReader> {
let min_val;
let amplitude;
{
let mut cursor = data.as_slice();
min_val = try!(u32::deserialize(&mut cursor));
amplitude = try!(u32::deserialize(&mut cursor));
}
let num_bits = compute_num_bits(amplitude);
let mask = (1 << num_bits) - 1;
let ptr: *const u8 = &(data.deref()[8 as usize]);
Ok(U32FastFieldReader {
_data: data,
data_ptr: ptr,
min_val: min_val,
max_val: min_val + amplitude,
num_bits: num_bits as u32,
mask: mask,
})
}
pub fn get(&self, doc: DocId) -> u32 {
if self.num_bits == 0u32 {
return self.min_val;
}
let addr = (doc * self.num_bits) / 8;
let bit_shift = (doc * self.num_bits) - addr * 8; //doc - long_addr * self.num_in_pack;
let val_unshifted_unmasked: u64 = unsafe { * (self.data_ptr.offset(addr as isize) as *const u64) };
let val_shifted = (val_unshifted_unmasked >> bit_shift) as u32;
self.min_val + (val_shifted & self.mask)
}
}
impl From<Vec<u32>> for U32FastFieldReader {
fn from(vals: Vec<u32>) -> U32FastFieldReader {
let mut schema_builder = SchemaBuilder::default();
let field = schema_builder.add_u32_field("field", FAST);
let schema = schema_builder.build();
let path = Path::new("test");
let mut directory: RAMDirectory = RAMDirectory::create();
{
let write: WritePtr = directory.open_write(Path::new("test")).unwrap();
let mut serializer = FastFieldSerializer::new(write).unwrap();
let mut fast_field_writers = U32FastFieldsWriter::from_schema(&schema);
for val in vals {
let mut fast_field_writer = fast_field_writers.get_field_writer(field).unwrap();
fast_field_writer.add_val(val);
}
fast_field_writers.serialize(&mut serializer).unwrap();
serializer.close().unwrap();
}
let source = directory.open_read(&path).unwrap();
let fast_field_readers = U32FastFieldsReader::open(source).unwrap();
fast_field_readers.get_field(field).unwrap()
}
}
pub struct U32FastFieldsReader {
source: ReadOnlySource,
field_offsets: HashMap<Field, (u32, u32)>,
}
impl U32FastFieldsReader {
pub fn open(source: ReadOnlySource) -> io::Result<U32FastFieldsReader> {
let header_offset;
let field_offsets: Vec<(Field, u32)>;
{
let buffer = source.as_slice();
{
let mut cursor = buffer;
header_offset = try!(u32::deserialize(&mut cursor));
}
{
let mut cursor = &buffer[header_offset as usize..];
field_offsets = try!(Vec::deserialize(&mut cursor));
}
}
let mut end_offsets: Vec<u32> = field_offsets
.iter()
.map(|&(_, offset)| offset)
.collect();
end_offsets.push(header_offset);
let mut field_offsets_map: HashMap<Field, (u32, u32)> = HashMap::new();
for (field_start_offsets, stop_offset) in field_offsets.iter().zip(end_offsets.iter().skip(1)) {
let (field, start_offset) = *field_start_offsets;
field_offsets_map.insert(field, (start_offset, *stop_offset));
}
Ok(U32FastFieldsReader {
field_offsets: field_offsets_map,
source: source,
})
}
pub fn get_field(&self, field: Field) -> io::Result<U32FastFieldReader> {
match self.field_offsets.get(&field) {
Some(&(start, stop)) => {
let field_source = self.source.slice(start as usize, stop as usize);
U32FastFieldReader::open(field_source)
}
None => {
Err(io::Error::new(io::ErrorKind::InvalidInput, "Could not find field"))
}
}
}
}
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