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/// CQL query statement.
///
/// This represents a CQL query that can be executed on a server.
#[derive(Clone)]
pub struct Query {
    contents: String,
    page_size: Option<i32>,
}

impl Query {
    /// Creates a new `Query` from a CQL query string.
    pub fn new(contents: String) -> Self {
        Self {
            contents,
            page_size: None,
        }
    }

    /// Returns the string representation of the CQL query.
    pub fn get_contents(&self) -> &str {
        &self.contents
    }

    /// Sets the page size for this CQL query.
    pub fn set_page_size(&mut self, page_size: i32) {
        assert!(page_size > 0, "page size must be larger than 0");
        self.page_size = Some(page_size);
    }

    /// Disables paging for this CQL query.
    pub fn disable_paging(&mut self) {
        self.page_size = None;
    }

    /// Returns the page size for this CQL query.
    pub fn get_page_size(&self) -> Option<i32> {
        self.page_size
    }
}

impl From<String> for Query {
    fn from(s: String) -> Query {
        Query::new(s)
    }
}

impl<'a> From<&'a str> for Query {
    fn from(s: &'a str) -> Query {
        Query::new(s.to_owned())
    }
}