Struct geos::ContextHandle

pub struct ContextHandle<'a> { /* private fields */ }

Implementations

impl<'a> ContextHandle<'a>

pub fn init() -> GResult<Self>

Creates a new ContextHandle.

Example

use geos::ContextHandle;

let context_handle = ContextHandle::init().expect("invalid init");

pub fn set_notice_message_handler(
    &self,
    nf: Option<Box<dyn Fn(&str) + Send + Sync + 'a>>
)

Allows to set a notice message handler.

Passing None as parameter will unset this callback.

Example

use geos::ContextHandle;

let context_handle = ContextHandle::init().expect("invalid init");

context_handle.set_notice_message_handler(Some(Box::new(|s| println!("new message: {}", s))));

pub fn set_error_message_handler(
    &self,
    ef: Option<Box<dyn Fn(&str) + Send + Sync + 'a>>
)

Allows to set an error message handler.

Passing None as parameter will unset this callback.

Example

use geos::ContextHandle;

let context_handle = ContextHandle::init().expect("invalid init");

context_handle.set_error_message_handler(Some(Box::new(|s| println!("new message: {}", s))));

pub fn get_last_error(&self) -> Option<String>

Returns the last error encountered.

Please note that calling this function will remove the current last error!

use geos::ContextHandle;

let context_handle = ContextHandle::init().expect("invalid init");
// make some functions calls...
if let Some(last_error) = context_handle.get_last_error() {
    println!("We have an error: {}", last_error);
} else {
    println!("No error occurred!");
}

pub fn get_last_notification(&self) -> Option<String>

Returns the last notification encountered.

Please note that calling this function will remove the current last notification!

use geos::ContextHandle;

let context_handle = ContextHandle::init().expect("invalid init");
// make some functions calls...
if let Some(last_notif) = context_handle.get_last_notification() {
    println!("We have a notification: {}", last_notif);
} else {
    println!("No notifications!");
}

pub fn get_wkb_output_dimensions(&self) -> GResult<OutputDimension>

Gets WKB output dimensions.

Example

use geos::{ContextHandle, OutputDimension};

let mut context_handle = ContextHandle::init().expect("invalid init");

context_handle.set_wkb_output_dimensions(OutputDimension::TwoD);
assert_eq!(context_handle.get_wkb_output_dimensions(), Ok(OutputDimension::TwoD));

pub fn set_wkb_output_dimensions(
    &mut self,
    dimensions: OutputDimension
) -> GResult<OutputDimension>

Sets WKB output dimensions.

Example

use geos::{ContextHandle, OutputDimension};

let mut context_handle = ContextHandle::init().expect("invalid init");

context_handle.set_wkb_output_dimensions(OutputDimension::TwoD);
assert_eq!(context_handle.get_wkb_output_dimensions(), Ok(OutputDimension::TwoD));

pub fn get_wkb_byte_order(&self) -> ByteOrder

Gets WKB byte order.

Example

use geos::{ContextHandle, ByteOrder};

let mut context_handle = ContextHandle::init().expect("invalid init");

context_handle.set_wkb_byte_order(ByteOrder::LittleEndian);
assert!(context_handle.get_wkb_byte_order() == ByteOrder::LittleEndian);

pub fn set_wkb_byte_order(&mut self, byte_order: ByteOrder) -> ByteOrder

Sets WKB byte order.

Example

use geos::{ContextHandle, ByteOrder};

let mut context_handle = ContextHandle::init().expect("invalid init");

context_handle.set_wkb_byte_order(ByteOrder::LittleEndian);
assert!(context_handle.get_wkb_byte_order() == ByteOrder::LittleEndian);

Trait Implementations

impl<'a> Drop for ContextHandle<'a>

fn drop(&mut self)

Executes the destructor for this type.