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Update EstateEase Developer Guide #19

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Mar 4, 2024
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Update EstateEase Developer Guide #19

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30 changes: 28 additions & 2 deletions docs/DeveloperGuide.md
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Expand Up @@ -299,9 +299,9 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli

(For all use cases below, the **System** is the `EstateEase` and the **Actor** is the `user`, unless specified otherwise)

**Use case: Delete a person**
**Use case: UC03 - Delete a person**

**MSS**
**MSS:**

1. User requests to list persons
2. EstateEase shows a list of persons
Expand All @@ -322,6 +322,32 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli

Use case resumes at step 2.

**Use case: UC05 - Save to storage**

**Actor: EstateEase**

**Preconditions: The user initiates an add or delete command**

**MSS:**

1. EstateEase processes the add (UC01) or delete (UC03) command and updates the address book accordingly.
2. EstateEase attempts to update the JSON file accordingly.
3. EstateEase successfully updates the JSON file.

Use case ends.

**Extensions**

* 2a. EstateEase is unable to write to the JSON file due to file permission issue.
* 2a1. EstateEase shows error message regarding the insufficient file permission to the user.

Use case ends.

* 2b. EstateEase is unable to write to the JSON file due to some IOException.
* 2b1. EstateEase shows error message regarding the IOException to the user.
Use case ends.


*{More to be added}*

### Non-Functional Requirements
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