added uniqueness for nickname, #612

Author: fehguy

modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/DefaultGenerator.java

@@ -24,6 +24,7 @@
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
@@ -154,6 +155,7 @@ public Reader getTemplate(String name) {
       for (String tag : paths.keySet()) {
         List<CodegenOperation> ops = paths.get(tag);
         Map<String, Object> operation = processOperations(config, tag, ops);
+
         operation.put("basePath", basePath);
         operation.put("contextPath", contextPath);
         operation.put("baseName", tag);
@@ -363,10 +365,24 @@ public Map<String, Object> processOperations(CodegenConfig config, String tag, L
     Map<String, Object> operations = new HashMap<String, Object>();
     Map<String, Object> objs = new HashMap<String, Object>();
     objs.put("classname", config.toApiName(tag));
+
+    // check for operationId uniqueness
+    Set<String> opIds = new HashSet<String>();
+    int counter = 0;
+    for(CodegenOperation op : ops) {
+      String opId = op.nickname;
+      if(opIds.contains(opId)) {
+        counter ++;
+        op.nickname += "_" + counter;
+      }
+      opIds.add(opId);
+    }
     objs.put("operation", ops);
+
     operations.put("operations", objs);
     operations.put("package", config.apiPackage());
 
+
     Set<String> allImports = new LinkedHashSet<String>();
     for (CodegenOperation op : ops) {
       allImports.addAll(op.imports);