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use std::{
fs::File,
path::Path,
io::{BufRead, BufReader}
};
use quick_xml::Reader;
use crate::{
table::{Table, TableElem},
error::VOTableError,
data::{
TableOrBinOrBin2,
stream::Stream, binary::Binary, binary2::Binary2
},
votable::{VOTable, VOTableWrapper},
resource::{Resource, ResourceOrTable},
impls::{Schema, VOTableValue, mem::VoidTableDataContent},
iter::elems::{Binary2RowValueIterator, BinaryRowValueIterator},
};
pub mod elems;
pub mod strings;
use elems::DataTableRowValueIterator;
// use strings::RowStringIterator;
// Idee:
// Iterator de Tables, iterator give access to
// - current talble
// - current resource
// - current votable
// - next table
// => iterator on rows (indep of TableData/Binary/Binary2)
pub trait TableIter: Iterator<Item=Result<Vec<VOTableValue>, VOTableError>> {
fn table(&mut self) -> &mut Table<VoidTableDataContent>;
}
pub struct VOTableIterator<R: BufRead> {
reader: Reader<R>,
reader_buff: Vec<u8>,
// fn next_table -> (&votable, &resource, &table, &rows, Enum)
//
votable: VOTable<VoidTableDataContent>,
resource_stack: Vec<Resource<VoidTableDataContent>>,
}
impl VOTableIterator<BufReader<File>> {
pub fn from_file<P: AsRef<Path>>(path: P) -> Result<VOTableIterator<BufReader<File>>, VOTableError> {
let mut reader_buff: Vec<u8> = Vec::with_capacity(1024);
let (votable, resource, reader) = VOTableWrapper::<VoidTableDataContent>::manual_from_ivoa_xml_file(path, &mut reader_buff)?;
let mut resource_stack = Vec::default();
resource_stack.push(resource);
Ok(VOTableIterator::<BufReader<File>> {
reader,
reader_buff,
votable,
resource_stack,
})
}
pub fn end_of_it(self) -> VOTable<VoidTableDataContent> {
self.votable
}
}
impl<R: BufRead> VOTableIterator<R> {
/*pub fn next_table_row_string_iter<'a>(&'a mut self) -> Result<Option<RowStringIterator<'a, R>>, VOTableError> {
loop {
if let Some(mut resource) = self.resource_stack.pop() {
match resource.read_till_next_resource_or_table_by_ref(&mut self.reader, &mut self.reader_buff)? {
Some(ResourceOrTable::<_>::Resource(sub_resource)) => {
self.resource_stack.push(resource);
self.resource_stack.push(sub_resource);
},
Some(ResourceOrTable::<_>::Table(mut table)) => {
if let Some(mut data) = table.read_till_data_by_ref(&mut self.reader, &mut self.reader_buff)? {
match data.read_till_table_bin_or_bin2_or_fits_by_ref(&mut self.reader, &mut self.reader_buff)? {
Some(TableOrBinOrBin2::TableData) => {
table.set_data_by_ref(data);
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
let row_it = RowStringIterator::new(
&mut self.reader,
&mut self.reader_buff,
// self.resource_stack.last_mut().unwrap().tables.last_mut().unwrap()
);
return Ok(Some(row_it));
},
Some(TableOrBinOrBin2::Binary) => {
let _stream = Stream::open_stream(&mut self.reader, &mut self.reader_buff)?;
todo!()
},
Some(TableOrBinOrBin2::Binary2) => {
let _stream = Stream::open_stream(&mut self.reader, &mut self.reader_buff)?;
todo!()
},
Some(TableOrBinOrBin2::Fits(_fits)) => {
todo!()
},
None => {
todo!()
},
}
} else {
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
}
},
None => self.votable.push_resource_by_ref(resource),
}
} else {
match self.votable.read_till_next_resource_by_ref(&mut self.reader, &mut self.reader_buff)? {
Some(resource) => self.resource_stack.push(resource),
None => return Ok(None),
}
}
}
}*/
pub fn next_table_row_value_iter<'a>(&'a mut self) -> Result<Option<Box<dyn 'a + TableIter>>, VOTableError> {
loop {
if let Some(mut resource) = self.resource_stack.pop() {
match resource.read_till_next_resource_or_table_by_ref(&mut self.reader, &mut self.reader_buff)? {
Some(ResourceOrTable::<_>::Resource(sub_resource)) => {
self.resource_stack.push(resource);
self.resource_stack.push(sub_resource);
},
Some(ResourceOrTable::<_>::Table(mut table)) => {
if let Some(mut data) = table.read_till_data_by_ref(&mut self.reader, &mut self.reader_buff)? {
match data.read_till_table_bin_or_bin2_or_fits_by_ref(&mut self.reader, &mut self.reader_buff)? {
Some(TableOrBinOrBin2::TableData) => {
table.set_data_by_ref(data);
let schema: Vec<Schema> = table.elems.iter()
.filter_map(|table_elem|
match table_elem {
TableElem::Field(field) => Some(field.into()),
_ => None
}
).collect();
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
let row_it = DataTableRowValueIterator::new(
&mut self.reader,
&mut self.reader_buff,
self.resource_stack.last_mut().unwrap().tables.last_mut().unwrap(),
schema,
);
return Ok(Some(Box::new(row_it)));
},
Some(TableOrBinOrBin2::Binary) => {
let stream = Stream::open_stream(&mut self.reader, &mut self.reader_buff)?;
let binary = Binary::from_stream(stream);
data.set_binary_by_ref(binary);
table.set_data_by_ref(data);
let schema: Vec<Schema> = table.elems.iter()
.filter_map(|table_elem|
match table_elem {
TableElem::Field(field) => Some(field.into()),
_ => None
}
).collect();
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
let row_it = BinaryRowValueIterator::new(
&mut self.reader,
self.resource_stack.last_mut().unwrap().tables.last_mut().unwrap(),
schema,
);
return Ok(Some(Box::new(row_it)));
},
Some(TableOrBinOrBin2::Binary2) => {
let stream = Stream::open_stream(&mut self.reader, &mut self.reader_buff)?;
let binary2 = Binary2::from_stream(stream);
data.set_binary2_by_ref(binary2);
table.set_data_by_ref(data);
let schema: Vec<Schema> = table.elems.iter()
.filter_map(|table_elem|
match table_elem {
TableElem::Field(field) => Some(field.into()),
_ => None
}
).collect();
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
let row_it = Binary2RowValueIterator::new(
&mut self.reader,
self.resource_stack.last_mut().unwrap().tables.last_mut().unwrap(),
schema,
);
return Ok(Some(Box::new(row_it)));
},
Some(TableOrBinOrBin2::Fits(fits)) => {
data.set_fits_by_ref(fits);
table.set_data_by_ref(data);
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
},
None => {
return Err(VOTableError::Custom(String::from("Unexpected empty DATA")));
},
}
} else {
resource.push_table_by_ref(table);
self.resource_stack.push(resource);
}
},
None => self.votable.push_resource_by_ref(resource),
}
} else {
match self.votable.read_till_next_resource_by_ref(&mut self.reader, &mut self.reader_buff)? {
Some(resource) => self.resource_stack.push(resource),
None => return Ok(None),
}
}
}
}
}