Function apply_restore

atomic-core/src/crdt/apply/branch.rs:326–354

Applies a Restore operation to restore a deleted line. # Behavior 1. Verifies the branch exists 2. Verifies the branch is currently deleted 3. Updates the branch's state to Alive # Errors - `BranchNotFound` - The branch doesn't exist - `InvalidBranchState` - The branch is not deleted

(
    txn: &mut T,
    context: &mut ApplyContext,
    branch_id: BranchId,
)

/// - `BranchNotFound` - The branch doesn't exist
/// - `InvalidBranchState` - The branch is not deleted
fn apply_restore<T: MutCrdtTxnT>(
    txn: &mut T,
    context: &mut ApplyContext,
    branch_id: BranchId,
) -> ApplyResult<()> {
    // Verify branch exists
    let branch = txn
        .get_branch(branch_id)
        .map_err(|e| storage_err(e, "getting branch"))?
        .ok_or_else(|| ApplyError::branch_not_found(branch_id))?;

    // Check current state
    if !branch.state().is_deleted() {
        if context.options().allow_duplicate_ids() {
            context.record_skipped();
            return Ok(());
        }
        return Err(ApplyError::invalid_branch_state(
            branch_id, "alive", "restore",
        ));
    }

    // Update state to alive
    txn.update_branch_state(branch_id, BranchState::Alive)
        .map_err(|e| storage_err(e, "updating branch state"))?;

    context.record_branch_restored();
    Ok(())
}

// Reparent Operation