[Developer] #424 show VPD policy details

src/main/java/com/cloudhandson/vpdbackoffice/service/VpdPolicyService.java

@@ -1,6 +1,7 @@
 package com.cloudhandson.vpdbackoffice.service;
 
 import com.cloudhandson.vpdbackoffice.domain.vpd.VpdFunctionSource;
+import com.cloudhandson.vpdbackoffice.domain.vpd.VpdPolicyDetail;
 import com.cloudhandson.vpdbackoffice.domain.vpd.VpdPolicyView;
 import com.cloudhandson.vpdbackoffice.mapper.VpdPolicyMapper;
 import java.util.List;
@@ -30,6 +31,72 @@ public class VpdPolicyService {
     return new VpdFunctionSource(normalizedOwner, objectName, objectType, source);
   }
 
+  public VpdPolicyDetail findPolicyDetail(String objectOwner, String objectName, String policyName) {
+    String normalizedOwner = requiredIdentifier(objectOwner, "Object owner");
+    String normalizedObject = requiredIdentifier(objectName, "Object name");
+    String normalizedPolicy = requiredIdentifier(policyName, "Policy name");
+    VpdPolicyView policy = mapper.findPolicy(normalizedOwner, normalizedObject, normalizedPolicy);
+    if (policy == null) {
+      throw new AppException("VPD policy를 찾을 수 없습니다.");
+    }
+    return new VpdPolicyDetail(policy, buildAddPolicyBlock(policy));
+  }
+
+  private String buildAddPolicyBlock(VpdPolicyView policy) {
+    return """
+        BEGIN
+          DBMS_RLS.ADD_POLICY(
+            object_schema   => '%s',
+            object_name     => '%s',
+            policy_name     => '%s',
+            function_schema => '%s',
+            policy_function => '%s',
+            statement_types => '%s',
+            update_check    => %s,
+            enable          => %s,
+            static_policy   => %s,
+            policy_type     => %s,
+            long_predicate  => %s
+          );
+        END;
+        /
+        """.formatted(
+        policy.objectOwner(),
+        policy.objectName(),
+        policy.policyName(),
+        policy.functionOwner(),
+        policyFunctionArgument(policy),
+        blankToDefault(policy.statementTypes(), "SELECT"),
+        yesNoBoolean(policy.checkOption()),
+        yesNoBoolean(policy.enabled()),
+        yesNoBoolean(policy.staticPolicy()),
+        policyTypeArgument(policy.policyType()),
+        yesNoBoolean(policy.longPredicate())
+    );
+  }
+
+  private String policyFunctionArgument(VpdPolicyView policy) {
+    if (policy.packageName() == null || policy.packageName().isBlank()) {
+      return policy.functionName();
+    }
+    return policy.packageName() + "." + policy.functionName();
+  }
+
+  private String blankToDefault(String value, String defaultValue) {
+    return value == null || value.isBlank() ? defaultValue : value;
+  }
+
+  private String yesNoBoolean(String value) {
+    return "YES".equalsIgnoreCase(value) ? "TRUE" : "FALSE";
+  }
+
+  private String policyTypeArgument(String policyType) {
+    if (policyType == null || policyType.isBlank()) {
+      return "NULL";
+    }
+    return "DBMS_RLS." + policyType.trim().toUpperCase(Locale.ROOT);
+  }
+
   private String requiredIdentifier(String value, String label) {
     String normalized = normalizeOptionalIdentifier(value);
     if (normalized == null) {