Contributing guidelines

Working on an issue

Before starting to work on something, please comment in JIRA or ask on the mailing list

to make sure nobody else is working on it.

If a fix applies both to 2.0 and 2.1, work on the 2.0 branch, your commit will eventually

get merged in 2.1.

Before you send your pull request, make sure that:

- you have a unit test that failed before the fix and succeeds after.

- the fix is mentioned in ``driver-core/CHANGELOG.rst``.

- the commit message include the reference of the JIRA ticket for automatic linking

(example: ``Fix NPE when a connection fails during pool construction (JAVA-503).``).

As long as your pull request is not merged, it's OK to rebase your branch and push with

``--force``.

If you want to contribute but don't have a specific issue in mind, the `lhf <https://datastax-oss.atlassian.net/secure/IssueNavigator.jspa?reset=true&mode=hide&jqlQuery=project%20%3D%20JAVA%20AND%20status%20in%20(Open%2C%20Reopened)%20AND%20labels%20%3D%20lhf>`_

label in JIRA is a good place to start: it marks "low hanging fruits" that don't require

in-depth knowledge of the codebase.

Editor configuration

General

We consider automatic formatting as a help, not a crutch. Sometimes it makes sense to

break the rules to make the code more readable, for instance aligning columns (see the

constant declarations in ``DataType.Name`` for an example of this).

**Please do not reformat whole files, only the lines that you have added or modified**.

Eclipse

Formatter:

- Preferences > Java > Code Style > Formatter.

- Click "Import".

- Select ``src/main/config/ide/eclipse-formatter.xml``.

Import order:

- Preferences > Java > Code Style > Organize imports.

- Click "Import".

- Select ``src/main/config/ide/eclipse.importorder``.

Prevent trailing whitespaces:

- Preferences > Java > Editor > Save Actions.

- Check "Perform the selected actions on save".

- Ensure "Format source code" and "Organize imports" are unchecked.

- Check "Additional actions".

- Click "Configure".

- In the "Code Organizing" tab, check "Remove trailing whitespace" and "All lines".

- Click "OK" (the text area should only have one action "Remove trailing white spaces").

IntelliJ IDEA

- File > Import Settings...

- Select ``src/main/config/ide/intellij-code-style.jar``.

This should add a new Code Style scheme called "java-driver".