Merge pull request #790 from xhh/java-accept-contenttype

Minor improvement to Java API client accept and content-type header

modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/languages/JavaClientCodegen.java

@@ -109,9 +109,10 @@ public class JavaClientCodegen extends DefaultCodegen implements CodegenConfig {
     final String invokerFolder = (sourceFolder + File.separator + invokerPackage).replace(".", File.separator);
     supportingFiles.add(new SupportingFile("pom.mustache", "", "pom.xml"));
     supportingFiles.add(new SupportingFile("ApiClient.mustache", invokerFolder, "ApiClient.java"));
-    supportingFiles.add(new SupportingFile("JsonUtil.mustache", invokerFolder, "JsonUtil.java"));
     supportingFiles.add(new SupportingFile("apiException.mustache", invokerFolder, "ApiException.java"));
     supportingFiles.add(new SupportingFile("Configuration.mustache", invokerFolder, "Configuration.java"));
+    supportingFiles.add(new SupportingFile("JsonUtil.mustache", invokerFolder, "JsonUtil.java"));
+    supportingFiles.add(new SupportingFile("StringUtil.mustache", invokerFolder, "StringUtil.java"));
 
     final String authFolder = (sourceFolder + File.separator + invokerPackage + ".auth").replace(".", File.separator);
     supportingFiles.add(new SupportingFile("auth/Authentication.mustache", authFolder, "Authentication.java"));

modules/swagger-codegen/src/main/resources/Java/ApiClient.mustache

@@ -238,6 +238,36 @@ public class ApiClient {
     }
   }
 
+  /**
+   * Select the Accept header's value from the given accepts array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use all of them (joining into a string)
+   *
+   * @param accepts The accepts array to select from
+   * @return The Accept header to use. If the given array is empty,
+   *   null will be returned (not to set the Accept header explicitly).
+   */
+  public String selectHeaderAccept(String[] accepts) {
+    if (accepts.length == 0) return null;
+    if (StringUtil.containsIgnoreCase(accepts, "application/json")) return "application/json";
+    return StringUtil.join(accepts, ",");
+  }
+
+  /**
+   * Select the Content-Type header's value from the given array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use the first one of the array.
+   *
+   * @param contentTypes The Content-Type array to select from
+   * @return The Content-Type header to use. If the given array is empty,
+   *   JSON will be used.
+   */
+  public String selectHeaderContentType(String[] contentTypes) {
+    if (contentTypes.length == 0) return "application/json";
+    if (StringUtil.containsIgnoreCase(contentTypes, "application/json")) return "application/json";
+    return contentTypes[0];
+  }
+
   /**
    * Escape the given string to be used as URL query value.
    */
@@ -306,11 +336,12 @@ public class ApiClient {
    * @param body The request body object
    * @param headerParams The header parameters
    * @param formParams The form parameters
-   * @param contentType The request Content-Type
+   * @param accept The request's Accept header
+   * @param contentType The request's Content-Type header
    * @param authNames The authentications to apply
    * @return The response body in type of string
    */
-  public String invokeAPI(String path, String method, Map<String, String> queryParams, Object body, Map<String, String> headerParams, Map<String, String> formParams, String contentType, String[] authNames) throws ApiException {
+  public String invokeAPI(String path, String method, Map<String, String> queryParams, Object body, Map<String, String> headerParams, Map<String, String> formParams, String accept, String contentType, String[] authNames) throws ApiException {
     updateParamsForAuth(authNames, queryParams, headerParams);
 
     Client client = getClient();
@@ -328,16 +359,21 @@ public class ApiClient {
     }
     String querystring = b.toString();
 
-    Builder builder = client.resource(basePath + path + querystring).accept("application/json");
+    Builder builder;
+    if (accept == null)
+      builder = client.resource(basePath + path + querystring).getRequestBuilder();
+    else
+      builder = client.resource(basePath + path + querystring).accept(accept);
+
     for(String key : headerParams.keySet()) {
       builder = builder.header(key, headerParams.get(key));
     }
-
     for(String key : defaultHeaderMap.keySet()) {
       if(!headerParams.containsKey(key)) {
         builder = builder.header(key, defaultHeaderMap.get(key));
       }
     }
+
     ClientResponse response = null;
 
     if("GET".equals(method)) {

modules/swagger-codegen/src/main/resources/Java/StringUtil.mustache

@@ -0,0 +1,41 @@
+package {{invokerPackage}};
+
+public class StringUtil {
+  /**
+   * Check if the given array contains the given value (with case-insensitive comparison).
+   *
+   * @param array The array
+   * @param value The value to search
+   * @return true if the array contains the value
+   */
+  public static boolean containsIgnoreCase(String[] array, String value) {
+    for (String str : array) {
+      if (value == null && str == null) return true;
+      if (value != null && value.equalsIgnoreCase(str)) return true;
+    }
+    return false;
+  }
+
+  /**
+   * Join an array of strings with the given separator.
+   * <p>
+   * Note: This might be replaced by utility method from commons-lang or guava someday
+   * if one of those libraries is added as dependency.
+   * </p>
+   *
+   * @param array     The array of strings
+   * @param separator The separator
+   * @return the resulting string
+   */
+  public static String join(String[] array, String separator) {
+    int len = array.length;
+    if (len == 0) return "";
+
+    StringBuilder out = new StringBuilder();
+    out.append(array[0]);
+    for (int i = 1; i < len; i++) {
+      out.append(separator).append(array[i]);
+    }
+    return out.toString();
+  }
+}

modules/swagger-codegen/src/main/resources/Java/api.mustache

@@ -68,14 +68,20 @@ public class {{classname}} {
     {{#queryParams}}if ({{paramName}} != null)
       queryParams.put("{{baseName}}", apiClient.parameterToString({{paramName}}));
     {{/queryParams}}
+
     {{#headerParams}}if ({{paramName}} != null)
       headerParams.put("{{baseName}}", apiClient.parameterToString({{paramName}}));
     {{/headerParams}}
-    String[] contentTypes = {
-      {{#consumes}}"{{mediaType}}"{{#hasMore}},{{/hasMore}}{{/consumes}}
-    };
 
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
+    final String[] accepts = {
+      {{#produces}}"{{mediaType}}"{{#hasMore}}, {{/hasMore}}{{/produces}}
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
+      {{#consumes}}"{{mediaType}}"{{#hasMore}}, {{/hasMore}}{{/consumes}}
+    };
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -103,7 +109,7 @@ public class {{classname}} {
 
     try {
       String[] authNames = new String[] { {{#authMethods}}"{{name}}"{{#hasMore}}, {{/hasMore}}{{/authMethods}} };
-      String response = apiClient.invokeAPI(path, "{{httpMethod}}", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "{{httpMethod}}", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return {{#returnType}}({{{returnType}}}) apiClient.deserialize(response, "{{returnContainer}}", {{returnBaseType}}.class){{/returnType}};
       }

samples/client/petstore/java/src/main/java/io/swagger/client/ApiClient.java

@@ -237,6 +237,36 @@ public class ApiClient {
     }
   }
 
+  /**
+   * Select the Accept header's value from the given accepts array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use all of them (joining into a string)
+   *
+   * @param accepts The accepts array to select from
+   * @return The Accept header to use. If the given array is empty,
+   *   null will be returned (not to set the Accept header explicitly).
+   */
+  public String selectHeaderAccept(String[] accepts) {
+    if (accepts.length == 0) return null;
+    if (StringUtil.containsIgnoreCase(accepts, "application/json")) return "application/json";
+    return StringUtil.join(accepts, ",");
+  }
+
+  /**
+   * Select the Content-Type header's value from the given array:
+   *   if JSON exists in the given array, use it;
+   *   otherwise use the first one of the array.
+   *
+   * @param contentTypes The Content-Type array to select from
+   * @return The Content-Type header to use. If the given array is empty,
+   *   JSON will be used.
+   */
+  public String selectHeaderContentType(String[] contentTypes) {
+    if (contentTypes.length == 0) return "application/json";
+    if (StringUtil.containsIgnoreCase(contentTypes, "application/json")) return "application/json";
+    return contentTypes[0];
+  }
+
   /**
    * Escape the given string to be used as URL query value.
    */
@@ -305,11 +335,12 @@ public class ApiClient {
    * @param body The request body object
    * @param headerParams The header parameters
    * @param formParams The form parameters
-   * @param contentType The request Content-Type
+   * @param accept The request's Accept header
+   * @param contentType The request's Content-Type header
    * @param authNames The authentications to apply
    * @return The response body in type of string
    */
-  public String invokeAPI(String path, String method, Map<String, String> queryParams, Object body, Map<String, String> headerParams, Map<String, String> formParams, String contentType, String[] authNames) throws ApiException {
+  public String invokeAPI(String path, String method, Map<String, String> queryParams, Object body, Map<String, String> headerParams, Map<String, String> formParams, String accept, String contentType, String[] authNames) throws ApiException {
     updateParamsForAuth(authNames, queryParams, headerParams);
 
     Client client = getClient();
@@ -327,16 +358,21 @@ public class ApiClient {
     }
     String querystring = b.toString();
 
-    Builder builder = client.resource(basePath + path + querystring).accept("application/json");
+    Builder builder;
+    if (accept == null)
+      builder = client.resource(basePath + path + querystring).getRequestBuilder();
+    else
+      builder = client.resource(basePath + path + querystring).accept(accept);
+
     for(String key : headerParams.keySet()) {
       builder = builder.header(key, headerParams.get(key));
     }
-
     for(String key : defaultHeaderMap.keySet()) {
       if(!headerParams.containsKey(key)) {
         builder = builder.header(key, defaultHeaderMap.get(key));
       }
     }
+
     ClientResponse response = null;
 
     if("GET".equals(method)) {

samples/client/petstore/java/src/main/java/io/swagger/client/StringUtil.java

@@ -0,0 +1,41 @@
+package io.swagger.client;
+
+public class StringUtil {
+  /**
+   * Check if the given array contains the given value (with case-insensitive comparison).
+   *
+   * @param array The array
+   * @param value The value to search
+   * @return true if the array contains the value
+   */
+  public static boolean containsIgnoreCase(String[] array, String value) {
+    for (String str : array) {
+      if (value == null && str == null) return true;
+      if (value != null && value.equalsIgnoreCase(str)) return true;
+    }
+    return false;
+  }
+
+  /**
+   * Join an array of strings with the given separator.
+   * <p>
+   * Note: This might be replaced by utility method from commons-lang or guava someday
+   * if one of those libraries is added as dependency.
+   * </p>
+   *
+   * @param array     The array of strings
+   * @param separator The separator
+   * @return the resulting string
+   */
+  public static String join(String[] array, String separator) {
+    int len = array.length;
+    if (len == 0) return "";
+
+    StringBuilder out = new StringBuilder();
+    out.append(array[0]);
+    for (int i = 1; i < len; i++) {
+      out.append(separator).append(array[i]);
+    }
+    return out.toString();
+  }
+}

samples/client/petstore/java/src/main/java/io/swagger/client/api/PetApi.java

@@ -60,11 +60,17 @@ public class PetApi {
 
     
 
-    String[] contentTypes = {
-      "application/json","application/xml"
-    };
     
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
+      "application/json", "application/xml"
+    };
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -79,7 +85,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "PUT", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "PUT", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -111,11 +117,17 @@ public class PetApi {
 
     
 
-    String[] contentTypes = {
-      "application/json","application/xml"
-    };
     
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
+      "application/json", "application/xml"
+    };
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -130,7 +142,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -164,11 +176,17 @@ public class PetApi {
       queryParams.put("status", apiClient.parameterToString(status));
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -183,7 +201,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (List<Pet>) apiClient.deserialize(response, "array", Pet.class);
       }
@@ -217,11 +235,17 @@ public class PetApi {
       queryParams.put("tags", apiClient.parameterToString(tags));
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -236,7 +260,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (List<Pet>) apiClient.deserialize(response, "array", Pet.class);
       }
@@ -274,11 +298,17 @@ public class PetApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -293,7 +323,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "api_key", "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (Pet) apiClient.deserialize(response, "", Pet.class);
       }
@@ -333,11 +363,17 @@ public class PetApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       "application/x-www-form-urlencoded"
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -366,7 +402,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -404,14 +440,20 @@ public class PetApi {
     Map<String, String> formParams = new HashMap<String, String>();
 
     
+
     if (apiKey != null)
       headerParams.put("api_key", apiClient.parameterToString(apiKey));
     
-    String[] contentTypes = {
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -426,7 +468,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "DELETE", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "DELETE", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -466,11 +508,17 @@ public class PetApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       "multipart/form-data"
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -499,7 +547,7 @@ public class PetApi {
 
     try {
       String[] authNames = new String[] { "petstore_auth" };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }

samples/client/petstore/java/src/main/java/io/swagger/client/api/StoreApi.java

@@ -59,11 +59,17 @@ public class StoreApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -78,7 +84,7 @@ public class StoreApi {
 
     try {
       String[] authNames = new String[] { "api_key" };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (Map<String, Integer>) apiClient.deserialize(response, "map", Map.class);
       }
@@ -110,11 +116,17 @@ public class StoreApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -129,7 +141,7 @@ public class StoreApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (Order) apiClient.deserialize(response, "", Order.class);
       }
@@ -167,11 +179,17 @@ public class StoreApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -186,7 +204,7 @@ public class StoreApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (Order) apiClient.deserialize(response, "", Order.class);
       }
@@ -224,11 +242,17 @@ public class StoreApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -243,7 +267,7 @@ public class StoreApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "DELETE", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "DELETE", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }

samples/client/petstore/java/src/main/java/io/swagger/client/api/UserApi.java

@@ -60,11 +60,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -79,7 +85,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -111,11 +117,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -130,7 +142,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -162,11 +174,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -181,7 +199,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "POST", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -218,11 +236,17 @@ public class UserApi {
       queryParams.put("password", apiClient.parameterToString(password));
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -237,7 +261,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (String) apiClient.deserialize(response, "", String.class);
       }
@@ -268,11 +292,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -287,7 +317,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -325,11 +355,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -344,7 +380,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "GET", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return (User) apiClient.deserialize(response, "", User.class);
       }
@@ -383,11 +419,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -402,7 +444,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "PUT", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "PUT", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }
@@ -440,11 +482,17 @@ public class UserApi {
 
     
 
-    String[] contentTypes = {
+    
+
+    final String[] accepts = {
+      "application/json", "application/xml"
+    };
+    final String accept = apiClient.selectHeaderAccept(accepts);
+
+    final String[] contentTypes = {
       
     };
-
+    final String contentType = apiClient.selectHeaderContentType(contentTypes);
-    String contentType = contentTypes.length > 0 ? contentTypes[0] : "application/json";
 
     if(contentType.startsWith("multipart/form-data")) {
       boolean hasFields = false;
@@ -459,7 +507,7 @@ public class UserApi {
 
     try {
       String[] authNames = new String[] {  };
-      String response = apiClient.invokeAPI(path, "DELETE", queryParams, postBody, headerParams, formParams, contentType, authNames);
+      String response = apiClient.invokeAPI(path, "DELETE", queryParams, postBody, headerParams, formParams, accept, contentType, authNames);
       if(response != null){
         return ;
       }

samples/client/petstore/java/src/test/java/io/swagger/client/ApiClientTest.java

@@ -15,6 +15,42 @@ public class ApiClientTest {
     apiClient = new ApiClient();
   }
 
+  @Test
+  public void testSelectHeaderAccept() {
+    String[] accepts = { "APPLICATION/JSON", "APPLICATION/XML" };
+    assertEquals("application/json", apiClient.selectHeaderAccept(accepts));
+
+    accepts = new String[] { "application/json", "application/xml" };
+    assertEquals("application/json", apiClient.selectHeaderAccept(accepts));
+
+    accepts = new String[] { "application/xml", "application/json" };
+    assertEquals("application/json", apiClient.selectHeaderAccept(accepts));
+
+    accepts = new String[] { "text/plain", "application/xml" };
+    assertEquals("text/plain,application/xml", apiClient.selectHeaderAccept(accepts));
+
+    accepts = new String[] { };
+    assertNull(apiClient.selectHeaderAccept(accepts));
+  }
+
+  @Test
+  public void testSelectHeaderContentType() {
+    String[] contentTypes = { "APPLICATION/JSON", "APPLICATION/XML" };
+    assertEquals("application/json", apiClient.selectHeaderContentType(contentTypes));
+
+    contentTypes = new String[] { "application/json", "application/xml" };
+    assertEquals("application/json", apiClient.selectHeaderContentType(contentTypes));
+
+    contentTypes = new String[] { "application/xml", "application/json" };
+    assertEquals("application/json", apiClient.selectHeaderContentType(contentTypes));
+
+    contentTypes = new String[] { "text/plain", "application/xml" };
+    assertEquals("text/plain", apiClient.selectHeaderContentType(contentTypes));
+
+    contentTypes = new String[] { };
+    assertEquals("application/json", apiClient.selectHeaderContentType(contentTypes));
+  }
+
   @Test
   public void testGetAuthentications() {
     Map<String, Authentication> auths = apiClient.getAuthentications();

samples/client/petstore/java/src/test/java/io/swagger/client/StringUtilTest.java

@@ -0,0 +1,32 @@
+package io.swagger.client;
+
+import static org.junit.Assert.*;
+import org.junit.*;
+
+public class StringUtilTest {
+  @Test
+  public void testContainsIgnoreCase() {
+    assertTrue(StringUtil.containsIgnoreCase(new String[]{ "abc" }, "abc"));
+    assertTrue(StringUtil.containsIgnoreCase(new String[]{ "abc" }, "ABC"));
+    assertTrue(StringUtil.containsIgnoreCase(new String[]{ "ABC" }, "abc"));
+    assertTrue(StringUtil.containsIgnoreCase(new String[]{ null, "abc" }, "ABC"));
+    assertTrue(StringUtil.containsIgnoreCase(new String[]{ null, "abc" }, null));
+
+    assertFalse(StringUtil.containsIgnoreCase(new String[]{ "abc" }, "def"));
+    assertFalse(StringUtil.containsIgnoreCase(new String[]{ }, "ABC"));
+    assertFalse(StringUtil.containsIgnoreCase(new String[]{ }, null));
+  }
+
+  @Test
+  public void testJoin() {
+    String[] array = { "aa", "bb", "cc" };
+    assertEquals("aa,bb,cc", StringUtil.join(array, ","));
+    assertEquals("aa, bb, cc", StringUtil.join(array, ", "));
+    assertEquals("aabbcc", StringUtil.join(array, ""));
+    assertEquals("aa bb cc", StringUtil.join(array, " "));
+    assertEquals("aa\nbb\ncc", StringUtil.join(array, "\n"));
+
+    assertEquals("", StringUtil.join(new String[]{ }, ","));
+    assertEquals("abc", StringUtil.join(new String[]{ "abc" }, ","));
+  }
+}