Add money config and operator

src/main/kotlin/com/cubetiqs/libra/moneyutils/Money.kt

@@ -5,14 +5,3 @@ data class Money(
     var currency: String = "USD"
 )
 
-operator fun Money.unaryMinus() = (-value)
-operator fun Money.unaryPlus() = (+value)
-operator fun Money.inc() = Money(value++)
-operator fun Money.dec() = Money(value--)
-operator fun Money.plus(other: Money) = Money(value + other.value)
-operator fun Money.times(other: Money) = Money(value * other.value)
-operator fun Money.div(other: Money) = Money(value / other.value)
-operator fun Money.timesAssign(other: Money) {
-    this.value = this.value * other.value
-}
-operator fun Money.not() = this.value != this.value

src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyConfig.kt

@@ -0,0 +1,53 @@
+package com.cubetiqs.libra.moneyutils
+
+/**
+ * Default money config in static object.
+ *
+ * @author sombochea
+ * @since 1.0
+ */
+object MoneyConfig {
+    private const val SPLIT_ORD_1 = ','
+    private const val SPLIT_ORD_2 = '='
+
+    /**
+     * Key is the currency
+     * Value is the rate
+     */
+    private val config = mutableMapOf<String, Double>()
+
+    fun parse(config: String): Map<String, Double> {
+        val result = mutableMapOf<String, Double>()
+        val rates = config.split(SPLIT_ORD_1)
+        /**
+         * USD=1
+         * KHR=4000
+         * EUR=0.99
+         *
+         * USD -> currency
+         * 1 -> value
+         */
+        rates.map { i ->
+            val temp = i.split(SPLIT_ORD_2)
+            if (temp.size == 2) {
+                val currency = temp[0]
+                val value = temp[1].toDouble()
+                result.put(currency.toUpperCase(), value)
+            } else {
+                throw IllegalArgumentException("invalid value!")
+            }
+        }
+
+        // if you want to use all set currencies without remove from memory, we should remove this line
+        this.config.clear()
+        this.config.putAll(result)
+        return result
+    }
+
+    // all currencies with its rate
+    fun getConfig() = this.config
+
+    fun getRate(currency: String): Double {
+        return getConfig()[currency.toUpperCase()] ?: throw IllegalArgumentException("currency not found")
+    }
+}

src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyOperator.kt

@@ -0,0 +1,13 @@
+package com.cubetiqs.libra.moneyutils
+
+operator fun Money.unaryMinus() = (-value)
+operator fun Money.unaryPlus() = (+value)
+operator fun Money.inc() = Money(value++)
+operator fun Money.dec() = Money(value--)
+operator fun Money.plus(other: Money) = Money(value + other.value)
+operator fun Money.times(other: Money) = Money(value * other.value)
+operator fun Money.div(other: Money) = Money(value / other.value)
+operator fun Money.timesAssign(other: Money) {
+    this.value = this.value * other.value
+}
+operator fun Money.not() = this.value != this.value

src/main/kotlin/com/cubetiqs/libra/moneyutils/StdMoney.kt

@@ -3,6 +3,9 @@ package com.cubetiqs.libra.moneyutils
 /**
  * Default standard money style
  * We have only value and currency of money
+ *
+ * @author sombochea
+ * @since 1.0
  */
 interface StdMoney {
     /**
@@ -14,6 +17,8 @@ interface StdMoney {
 
     /**
      * Get money's currency from current state.
+     *
+     * @return String
      */
     fun getCurrency(): String
 }