Change theme property list to set

src/main/java/run/halo/app/handler/theme/config/support/ThemeProperty.java

@@ -2,6 +2,8 @@ package run.halo.app.handler.theme.config.support;
 
 import lombok.Data;
 
+import java.util.Objects;
+
 /**
  * Theme property.
  *
@@ -84,4 +86,17 @@ public class ThemeProperty {
          */
         private String avatar;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ThemeProperty that = (ThemeProperty) o;
+        return id.equals(that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
 }

src/main/java/run/halo/app/service/ThemeService.java

@@ -11,6 +11,7 @@ import java.io.IOException;
 import java.nio.file.Path;
 import java.util.List;
 import java.util.Optional;
+import java.util.Set;
 
 /**
  * @author : RYAN0UP
@@ -86,10 +87,10 @@ public interface ThemeService {
     /**
      * Gets all themes
      *
-     * @return list of themes
+     * @return set of themes
      */
     @NonNull
-    List<ThemeProperty> getThemes();
+    Set<ThemeProperty> getThemes();
 
     /**
      * Lists theme folder by absolute path.

src/main/java/run/halo/app/service/impl/ThemeServiceImpl.java

@@ -93,7 +93,7 @@ public class ThemeServiceImpl implements ThemeService {
     public Optional<ThemeProperty> getThemeBy(String themeId) {
         Assert.hasText(themeId, "Theme id must not be blank");
 
-        List<ThemeProperty> themes = getThemes();
+        Set<ThemeProperty> themes = getThemes();
 
         log.debug("Themes type: [{}]", themes.getClass());
         log.debug("Themes: [{}]", themes);
@@ -102,38 +102,33 @@ public class ThemeServiceImpl implements ThemeService {
     }
 
     @Override
-    public List<ThemeProperty> getThemes() {
-        // Fetch themes from cache
-        List<ThemeProperty> result = cacheStore.get(THEMES_CACHE_KEY).map(themesCache -> {
-            try {
+    public Set<ThemeProperty> getThemes() {
+        Optional<String> themeCacheString = cacheStore.get(THEMES_CACHE_KEY);
+
+        try {
+            if (themeCacheString.isPresent()) {
                 // Convert to theme properties
-                ThemeProperty[] themeProperties = JsonUtils.jsonToObject(themesCache, ThemeProperty[].class);
-                return Arrays.asList(themeProperties);
-            } catch (IOException e) {
-                throw new ServiceException("Failed to parse json", e);
+                ThemeProperty[] themeProperties = JsonUtils.jsonToObject(themeCacheString.get(), ThemeProperty[].class);
+                return new HashSet<>(Arrays.asList(themeProperties));
             }
-        }).orElseGet(() -> {
-            try {
-                // List and filter sub folders
-                List<Path> themePaths = Files.list(getBasePath()).filter(path -> Files.isDirectory(path)).collect(Collectors.toList());
 
-                if (CollectionUtils.isEmpty(themePaths)) {
-                    return Collections.emptyList();
-                }
+            // List and filter sub folders
+            List<Path> themePaths = Files.list(getBasePath()).filter(path -> Files.isDirectory(path)).collect(Collectors.toList());
 
-                // Get theme properties
-                List<ThemeProperty> themes = themePaths.stream().map(this::getProperty).collect(Collectors.toList());
-
-                // Cache the themes
-                cacheStore.put(THEMES_CACHE_KEY, JsonUtils.objectToJson(themes));
-
-                return themes;
-            } catch (Exception e) {
-                throw new ServiceException("Themes scan failed", e);
+            if (CollectionUtils.isEmpty(themePaths)) {
+                return Collections.emptySet();
             }
-        });
 
-        return CollectionUtils.isEmpty(result) ? Collections.emptyList() : result;
+            // Get theme properties
+            Set<ThemeProperty> themes = themePaths.stream().map(this::getProperty).collect(Collectors.toSet());
+
+            // Cache the themes
+            cacheStore.put(THEMES_CACHE_KEY, JsonUtils.objectToJson(themes));
+
+            return themes;
+        } catch (IOException e) {
+            throw new ServiceException("Failed to get themes", e);
+        }
     }
 
     @Override

src/main/java/run/halo/app/web/controller/admin/api/ThemeController.java

@@ -12,6 +12,7 @@ import run.halo.app.service.ThemeSettingService;
 
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * Theme controller.
@@ -41,7 +42,7 @@ public class ThemeController {
 
     @GetMapping
     @ApiOperation("List all themes")
-    public List<ThemeProperty> listAll() {
+    public Set<ThemeProperty> listAll() {
         return themeService.getThemes();
     }
 
@@ -118,7 +119,7 @@ public class ThemeController {
 
     @PostMapping("upload")
     @ApiOperation("Upload theme")
-    public ThemeProperty uploadTheme(@RequestPart("file") MultipartFile file){
+    public ThemeProperty uploadTheme(@RequestPart("file") MultipartFile file) {
         return themeService.upload(file);
     }
 }