[add] 部署削除機能を追加

src/main/java/com/example/rhizome/app/domain/service/DeleteDepartment.java

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+package com.example.rhizome.app.domain.service;
+
+public interface DeleteDepartment {
+	void deleteDepartment(Integer idDepartment);
+}

src/main/java/com/example/rhizome/app/domain/service/impl/DeleteDepartmentImpl.java

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+package com.example.rhizome.app.domain.service.impl;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.rhizome.app.domain.service.DeleteDepartment;
+import com.example.rhizome.app.infra.repository.DepartmentRepository;
+
+@Service
+@Transactional
+public class DeleteDepartmentImpl implements DeleteDepartment {
+	
+	DepartmentRepository departmentReposirtory;
+	
+	@Autowired
+	public DeleteDepartmentImpl(DepartmentRepository departmentReposirtory) {
+		this.departmentReposirtory = departmentReposirtory;
+	}
+	
+	/**
+     * idDepartment を元に Department データを削除
+     *
+     * @param idDepartment 削除対象のidDepartment
+     */
+	public void deleteDepartment(Integer idDepartment) {
+		departmentReposirtory.deleteById(idDepartment);
+	}
+	
+}

src/main/java/com/example/rhizome/app/presentation/controller/DeleteDepartmentController.java

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+package com.example.rhizome.app.presentation.controller;
+
+import static com.example.rhizome.app.presentation.controller.pageproperty.TransitionTargetPageNameKeyword.*;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.servlet.http.HttpSession;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import com.example.rhizome.aop.aspect.PermissionCheck;
+import com.example.rhizome.aop.aspect.SessionCheck;
+import com.example.rhizome.app.domain.service.DeleteDepartment;
+import com.example.rhizome.app.domain.service.SearchDepartment;
+import com.example.rhizome.app.domain.service.SearchEmployee;
+import com.example.rhizome.app.presentation.controller.pageproperty.PageReturnAttributeKeyword;
+import com.example.rhizome.app.presentation.controller.pageproperty.TransitionTargetPageNameKeyword;
+import com.example.rhizome.app.presentation.form.MessageForm;
+
+@Controller
+public class DeleteDepartmentController {
+
+	// ログ出力用インスタンス
+    private final static Logger LOGGER = Logger.getLogger(DeleteEmployeeController.class.getName());
+
+    // エラーメッセージ用の定数フィールド
+    private final static String SEVERE_ERROR_MESSAGE = "エラーが発生しました！";
+
+    HttpSession httpSession;
+    DeleteDepartment deleteDepartment;
+    SearchDepartment searchDepartment;
+    SearchEmployee searchEmployee;
+
+    @Autowired
+    public DeleteDepartmentController(DeleteDepartment deleteDepartment, SearchDepartment searchDepartment, SearchEmployee searchEmployee, HttpSession httpSession) {
+        this.httpSession = httpSession;
+        this.deleteDepartment = deleteDepartment;
+        this.searchDepartment = searchDepartment;
+        this.searchEmployee = searchEmployee;
+    }
+
+    /**
+     * 削除処理のコントローラ
+     *
+     * @param idDepartment 削除対象のdepartmentId
+     * @param model      ビューにデータを渡すためのコンテナ
+     * @return 遷移先の画面
+     */
+    @PermissionCheck
+    @SessionCheck
+    @RequestMapping(value = DELETE_DEPARTMENT, method = RequestMethod.POST)
+    public String deleteDepartment(@RequestParam("idDepartment") Integer idDepartment, Model model) {
+
+        try {
+
+            // 削除処理実施
+            deleteExec(
+                    model,
+                    idDepartment);
+
+            // 検索画面に遷移
+            return "forward:" + TransitionTargetPageNameKeyword.SELECT_DEPARTMENT_INFO_FORM_EMPTY;
+
+        } catch (Exception e) {
+            // ログイン情報の破棄
+            httpSession.invalidate();
+
+            e.printStackTrace();
+            // エラーログ出力
+            LOGGER.log(Level.SEVERE, SEVERE_ERROR_MESSAGE, e);
+            // エラー画面遷移
+            return TransitionTargetPageNameKeyword.ERROR_HTML;
+        }
+    }
+
+    /**
+     * 削除処理実施
+     *
+     * @param model      ビューにデータを渡すためのコンテナ
+     * @param idDepartment 削除対象のdepartmentId
+     */
+    private void deleteExec(Model model, Integer idDepartment) {
+
+        final String DELETE_TARGET_ID_NOT_FIND = "削除対象のIDが不明です。";
+        final String DELETE_TARGET_HAS_MEMBERS = "1名以上が所属している部署は削除できません。";
+        final String DELETE_COMPLETE = "削除しました。";
+
+        // 削除対象の部署IDが存在するかチェック
+        if (searchDepartment.searchDepartmentById(idDepartment)==null) {
+            // 削除対象だった場合
+            // エラーメッセージをセット
+            model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(DELETE_TARGET_ID_NOT_FIND));
+            // 検索画面に遷移
+            return;
+        }
+        
+        // 削除対象の部署に所属している社員が1人以上いるか確認
+        if (searchEmployee.searchEmployeeByIdDepartment(idDepartment).size() > 0) {
+        	// 削除対象だった場合
+            // エラーメッセージをセット
+            model.addAttribute(PageReturnAttributeKeyword.MESSAGE_ERROR, new MessageForm(DELETE_TARGET_HAS_MEMBERS));
+            // 検索画面に遷移
+            return;
+        }
+        
+
+        // 削除を実施
+        deleteDepartment.deleteDepartment(idDepartment);
+
+        // 削除完了したメッセージをセット
+        model.addAttribute(PageReturnAttributeKeyword.MESSAGE_INFO, new MessageForm(DELETE_COMPLETE));
+
+    }
+}