diff --git a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/entity/domain/IndexNodeCodeProvider.java b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/entity/domain/IndexNodeCodeProvider.java
index e4e66a18..ec840e3b 100644
--- a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/entity/domain/IndexNodeCodeProvider.java
+++ b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/entity/domain/IndexNodeCodeProvider.java
@@ -1,6 +1,14 @@
 
 package cn.axzo.nanopart.doc.entity.domain;
 
+import static java.util.stream.Collectors.toList;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.apache.commons.collections4.CollectionUtils;
+import org.apache.commons.lang3.StringUtils;
+
 /**
  * @author yanglin
  */
@@ -8,4 +16,12 @@ public interface IndexNodeCodeProvider {
 
 	String indexNodeCode();
 
+	static List<String> collectIndexNodeCodes(List<? extends IndexNodeCodeProvider> nodes) {
+		if (CollectionUtils.isEmpty(nodes))
+			return Collections.emptyList();
+		return nodes.stream() //
+				.map(IndexNodeCodeProvider::indexNodeCode) //
+				.filter(StringUtils::isNotBlank) //
+				.collect(toList());
+	}
 }
diff --git a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexQueryService.java b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexQueryService.java
index d3841d41..2facb71e 100644
--- a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexQueryService.java
+++ b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexQueryService.java
@@ -1,8 +1,6 @@
 
 package cn.axzo.nanopart.doc.file.index;
 
-import static java.util.stream.Collectors.toList;
-
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
@@ -82,12 +80,7 @@ public class IndexQueryService {
 	}
 
 	public List<IndexNode> get(List<? extends IndexNodeCodeProvider> nodes) {
-		if (CollectionUtils.isEmpty(nodes))
-			return Collections.emptyList();
-		List<String> codes = nodes.stream() //
-				.map(IndexNodeCodeProvider::indexNodeCode) //
-				.filter(StringUtils::isNotBlank) //
-				.collect(toList());
+		List<String> codes = IndexNodeCodeProvider.collectIndexNodeCodes(nodes);
 		if (CollectionUtils.isEmpty(codes))
 			return Collections.emptyList();
 		return indexNodeDao.lambdaQuery().in(IndexNode::getCode, codes).list();
diff --git a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/templatedb/TemplateDatabaseQueryService.java b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/templatedb/TemplateDatabaseQueryService.java
index b1341037..99d3afad 100644
--- a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/templatedb/TemplateDatabaseQueryService.java
+++ b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/templatedb/TemplateDatabaseQueryService.java
@@ -87,7 +87,8 @@ public class TemplateDatabaseQueryService {
 				.eq(TemplateDatabase::getState, TemplateDatabaseState.VALID) //
 				.in(codes != null, TemplateDatabase::getCode, codes) //
 				.page(request.toPage());
-		return Page.toPage(request.getPage(), page.getSize(), page.getTotal(), toTemplateDatabaseInfo(page.getRecords()));
+		return Page.toPage(request.getPage(), page.getSize(), page.getTotal(),
+			toTemplateDatabaseInfo(page.getRecords()));
 	}
 
 	public List<TemplateDatabaseInfo> toTemplateDatabaseInfo(List<TemplateDatabase> templateDatabases) {
@@ -106,12 +107,7 @@ public class TemplateDatabaseQueryService {
 	}
 
 	public List<TemplateDatabase> get(List<? extends IndexNodeCodeProvider> nodes) {
-		if (CollectionUtils.isEmpty(nodes))
-			return Collections.emptyList();
-		List<String> codes = nodes.stream() //
-				.map(IndexNodeCodeProvider::indexNodeCode) //
-				.filter(StringUtils::isNotBlank) //
-				.collect(toList());
+		List<String> codes = IndexNodeCodeProvider.collectIndexNodeCodes(nodes);
 		if (CollectionUtils.isEmpty(codes))
 			return Collections.emptyList();
 		return templateDatabaseDao.lambdaQuery() //