Cleanup UrlBuilder with HttpUrl

app/src/main/java/com/hippo/ehviewer/network/UrlBuilder.kt

@@ -1,44 +1,14 @@
-/*
- * Copyright (C) 2014-2015 Hippo Seven
- *
- * Licensed 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
- *
- *      http://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.hippo.ehviewer.network
 
-class UrlBuilder(private var mRootUrl: String) {
-    private var mQueryMap: MutableMap<String, Any> = HashMap()
+import okhttp3.HttpUrl.Companion.toHttpUrl
+
+class UrlBuilder(mRootUrl: String) {
+    private val url = mRootUrl.toHttpUrl().newBuilder()
     fun addQuery(key: String, value: Any) {
-        mQueryMap[key] = value
+        url.addQueryParameter(key, value.toString())
     }
 
     fun build(): String {
-        return if (mQueryMap.isEmpty()) {
-            mRootUrl
-        } else {
-            val sb = StringBuilder(mRootUrl)
-            sb.append("?")
-            val iter: Iterator<String> = mQueryMap.keys.iterator()
-            if (iter.hasNext()) {
-                val key = iter.next()
-                val value = mQueryMap[key]
-                sb.append(key).append("=").append(value)
-            }
-            while (iter.hasNext()) {
-                val key = iter.next()
-                val value = mQueryMap[key]
-                sb.append("&").append(key).append("=").append(value)
-            }
-            sb.toString()
-        }
+        return url.toString()
     }
 }