1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96

use cassandra::data_type::ConstDataType;
use cassandra::iterator::FieldIterator;

use cassandra::schema::function_meta::FunctionMeta;
use cassandra::util::Protected;
use cassandra::value::Value;

use cassandra_sys::CassAggregateMeta as _CassAggregateMeta;
use cassandra_sys::cass_aggregate_meta_argument_count;
use cassandra_sys::cass_aggregate_meta_argument_type;
use cassandra_sys::cass_aggregate_meta_field_by_name;
use cassandra_sys::cass_aggregate_meta_final_func;
use cassandra_sys::cass_aggregate_meta_full_name;
use cassandra_sys::cass_aggregate_meta_init_cond;
use cassandra_sys::cass_aggregate_meta_name;
use cassandra_sys::cass_aggregate_meta_return_type;
use cassandra_sys::cass_aggregate_meta_state_func;
use cassandra_sys::cass_aggregate_meta_state_type;
use cassandra_sys::cass_iterator_fields_from_aggregate_meta;
use cassandra_sys::raw2utf8;
use std::ffi::CString;
use std::mem;


/// Metadata about a cassandra aggregate
#[derive(Debug)]
pub struct AggregateMeta(*const _CassAggregateMeta);

impl Protected<*const _CassAggregateMeta> for AggregateMeta {
    fn inner(&self) -> *const _CassAggregateMeta { self.0 }
    fn build(inner: *const _CassAggregateMeta) -> Self { AggregateMeta(inner) }
}

impl AggregateMeta {
    /// An iterator over the fields of an aggregate
    pub fn fields_iter(&self) -> FieldIterator {
        unsafe { FieldIterator::build(cass_iterator_fields_from_aggregate_meta(self.0)) }
    }


    /// Gets the name of the aggregate.
    pub fn get_name(&self) -> String {
        unsafe {
            let mut name = mem::zeroed();
            let mut name_length = mem::zeroed();
            cass_aggregate_meta_name(self.0, &mut name, &mut name_length);
            raw2utf8(name, name_length).expect("must be utf8")
        }
    }

    /// Gets the full name of the aggregate.
    pub fn full_name(&self) -> String {
        unsafe {
            let mut name = mem::zeroed();
            let mut name_length = mem::zeroed();
            cass_aggregate_meta_full_name(self.0, &mut name, &mut name_length);
            raw2utf8(name, name_length).expect("must be utf8")
        }
    }

    /// Gets the number of arguments this aggregate takes.
    pub fn argument_count(&self) -> usize { unsafe { cass_aggregate_meta_argument_count(self.0) } }

    /// Gets the aggregate's argument type for the provided index.
    pub fn argument_type(&self, index: usize) -> ConstDataType {
        unsafe { ConstDataType(cass_aggregate_meta_argument_type(self.0, index)) }
    }

    /// Gets the aggregate's argument return type.
    pub fn return_type(&self) -> ConstDataType { unsafe { ConstDataType(cass_aggregate_meta_return_type(self.0)) } }

    /// Gets the aggregate's argument state type.
    pub fn state_type(&self) -> ConstDataType { unsafe { ConstDataType(cass_aggregate_meta_state_type(self.0)) } }

    /// Gets the function metadata for the aggregate's state function.
    pub fn state_func(&self) -> FunctionMeta { unsafe { FunctionMeta::build(cass_aggregate_meta_state_func(self.0)) } }

    /// Gets the function metadata for the aggregates's final function.
    pub fn final_func(&self) -> FunctionMeta { unsafe { FunctionMeta::build(cass_aggregate_meta_final_func(self.0)) } }

    ///  Gets the initial condition value for the aggregate.
    pub fn init_cond(&self) -> Value { unsafe { Value::build(cass_aggregate_meta_init_cond(self.0)) } }

    ///  Gets a metadata field for the provided name. Metadata fields allow direct
    /// access to the column data found in the underlying "aggregates" metadata table.
    pub fn field_by_name(&self, name: &str) -> Option<Value> {
        unsafe {
            let agg = cass_aggregate_meta_field_by_name(self.0, CString::new(name).expect("must be utf8").as_ptr());
            if agg.is_null() {
                None
            } else {
                Some(Value::build(agg))
            }
        }
    }
}