reactor: remove deprecated WordUtils

Author: namjug-kim

reactive-crypto-core/src/main/kotlin/com/njkim/reactivecrypto/core/common/model/ExchangeVendor.kt

@@ -16,7 +16,7 @@
 
 package com.njkim.reactivecrypto.core.common.model
 
-import org.apache.commons.lang3.text.WordUtils
+import com.njkim.reactivecrypto.core.common.util.toCarmelCase
 
 enum class ExchangeVendor {
     UPBIT,
@@ -37,11 +37,10 @@ enum class ExchangeVendor {
     val websocketClientName: String
         get() {
             val packageName = this.name.toLowerCase().replace("_", "")
-            val carmelCaseName = WordUtils
-                .capitalizeFully(this.name, '_')
-                .replace("_", "")
+            val className = this.name.toCarmelCase()
+                .capitalize()
 
-            return "com.njkim.reactivecrypto.$packageName.${carmelCaseName}WebsocketClient"
+            return "com.njkim.reactivecrypto.$packageName.${className}WebsocketClient"
         }
 
     /**
@@ -50,10 +49,9 @@ enum class ExchangeVendor {
     val httpClientName: String
         get() {
             val packageName = this.name.toLowerCase().replace("_", "")
-            val carmelCaseName = WordUtils
-                .capitalizeFully(this.name, '_')
-                .replace("_", "")
+            val className = this.name.toCarmelCase()
+                .capitalize()
 
-            return "com.njkim.reactivecrypto.$packageName.http.${carmelCaseName}HttpClient"
+            return "com.njkim.reactivecrypto.$packageName.http.${className}HttpClient"
         }
-}
+}

reactive-crypto-core/src/main/kotlin/com/njkim/reactivecrypto/core/common/util/WordUtil.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2019 namjug-kim
+ *
+ * LINE Corporation licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package com.njkim.reactivecrypto.core.common.util
+
+val snakeCaseRegex = Regex("(_)([a-z])")
+
+fun String.toCarmelCase(): String {
+    return this.toLowerCase()
+        .replace(snakeCaseRegex) { matchResult -> matchResult.groupValues[2].toUpperCase() }
+}