add toString() to non-data class SolType

Author: tempofeng

etherspace-java/src/main/java/cc/etherspace/Types.kt

@@ -2,6 +2,7 @@
 
 package cc.etherspace
 
+import org.web3j.utils.Numeric
 import java.math.BigInteger
 import java.util.*
 
@@ -25,6 +26,10 @@ sealed class SolNumber(val value: BigInteger, val bits: Int, val unsigned: Boole
         result = 31 * result + bits
         return result
     }
+
+    override fun toString(): String {
+        return "SolNumber(value=$value, bits=$bits, unsigned=$unsigned)"
+    }
 }
 
 sealed class SolInt(value: BigInteger, bits: Int) : SolNumber(value, bits, false)
@@ -344,6 +349,10 @@ sealed class SolBytes(val value: ByteArray, val size: Int) : SolType {
         result = 31 * result + size
         return result
     }
+
+    override fun toString(): String {
+        return "SolBytes(value=${Numeric.toHexString(value)}, size=$size)"
+    }
 }
 
 class SolBytes2(value: ByteArray) : SolBytes(value, 2)
@@ -395,6 +404,10 @@ sealed class SolFixedArray<T>(val value: Array<T>) : SolType {
     override fun hashCode(): Int {
         return Arrays.hashCode(value)
     }
+
+    override fun toString(): String {
+        return "SolFixedArray(value=${Arrays.toString(value)})"
+    }
 }
 
 class SolArray1<T>(value: Array<T>) : SolFixedArray<T>(value)