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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

// Copyright 2015-2018 Aerospike, Inc.
//
// Portions may be licensed to Aerospike, Inc. under one or more contributor
// license agreements.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

use crate::errors::{ErrorKind, Result};
use crate::query::Filter;
use crate::Bins;
use crate::Value;

#[derive(Clone)]
pub struct Aggregation {
    pub package_name: String,
    pub function_name: String,
    pub function_args: Option<Vec<Value>>,
}

/// Query statement parameters.
pub struct Statement {
    /// Namespace
    pub namespace: String,

    /// Set name
    pub set_name: String,

    /// Optional index name
    pub index_name: Option<String>,

    /// Optional list of bin names to return in query.
    pub bins: Bins,

    /// Optional list of query filters. Currently, only one filter is allowed by the server on a
    /// secondary index lookup.
    pub filters: Option<Vec<Filter>>,

    /// Optional Lua aggregation function parameters.
    pub aggregation: Option<Aggregation>,
}

impl Statement {
    /// Create a new query statement with the given namespace, set name and optional list of bin
    /// names.
    ///
    /// # Examples
    ///
    /// Create a new statement to query the namespace "foo" and set "bar" and return the "name" and
    /// "age" bins for each matching record.
    ///
    /// ```rust
    /// # use aerospike::*;
    ///
    /// let stmt = Statement::new("foo", "bar", Bins::from(["name", "age"]));
    /// ```
    pub fn new(namespace: &str, set_name: &str, bins: Bins) -> Self {
        Statement {
            namespace: namespace.to_owned(),
            set_name: set_name.to_owned(),
            bins,
            index_name: None,
            aggregation: None,
            filters: None,
        }
    }

    /// Add a query filter to the statement. Currently, only one filter is allowed by the server on
    /// a secondary index lookup.
    ///
    /// # Example
    ///
    /// This example uses a numeric index on bin _baz_ in namespace _foo_ within set _bar_ to find
    /// all records using a filter with the range 0 to 100 inclusive:
    ///
    /// ```rust
    /// # use aerospike::*;
    ///
    /// let mut stmt = Statement::new("foo", "bar", Bins::from(["name", "age"]));
    /// stmt.add_filter(as_range!("baz", 0, 100));
    /// ```
    pub fn add_filter(&mut self, filter: Filter) {
        if let Some(ref mut filters) = self.filters {
            filters.push(filter);
        } else {
            let mut filters = vec![];
            filters.push(filter);
            self.filters = Some(filters);
        }
    }

    /// Set Lua aggregation function parameters.
    pub fn set_aggregate_function(
        &mut self,
        package_name: &str,
        function_name: &str,
        function_args: Option<&[Value]>,
    ) {
        let agg = Aggregation {
            package_name: package_name.to_owned(),
            function_name: function_name.to_owned(),
            function_args: match function_args {
                Some(args) => Some(args.to_vec()),
                None => None,
            },
        };
        self.aggregation = Some(agg);
    }

    #[doc(hidden)]
    pub fn is_scan(&self) -> bool {
        match self.filters {
            Some(ref filters) => filters.is_empty(),
            None => true,
        }
    }

    #[doc(hidden)]
    pub fn validate(&self) -> Result<()> {
        if let Some(ref filters) = self.filters {
            if filters.len() > 1 {
                bail!(ErrorKind::InvalidArgument(
                    "Too many filter expressions".to_string()
                ));
            }
        }

        if self.set_name.is_empty() {
            bail!(ErrorKind::InvalidArgument("Empty set name".to_string()));
        }

        if let Some(ref index_name) = self.index_name {
            if index_name.is_empty() {
                bail!(ErrorKind::InvalidArgument("Empty index name".to_string()));
            }
        }

        if let Some(ref agg) = self.aggregation {
            if agg.package_name.is_empty() {
                bail!(ErrorKind::InvalidArgument(
                    "Empty UDF package name".to_string()
                ));
            }

            if agg.function_name.is_empty() {
                bail!(ErrorKind::InvalidArgument(
                    "Empty UDF function name".to_string()
                ));
            }
        }

        Ok(())
    }
}