Implemented Jackson deserializers for BigDecimal, Date and File (otherwise Jackson does not know how to deserialize these classes)

common/build.gradle

@@ -53,6 +53,8 @@ kotlin {
                 api kotlin("stdlib-jdk7")
 
                 compileOnly "org.slf4j:slf4j-api:$slf4jVersion"
+
+                compileOnly "com.fasterxml.jackson.core:jackson-databind:2.9.9"
             }
         }
 

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/BigDecimal.kt

@@ -1,5 +1,8 @@
 package net.dankito.utils.multiplatform
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+import net.dankito.utils.multiplatform.serialization.BigDecimalDeserializer
+
 
 fun java.math.BigDecimal.toBigDecimal(): BigDecimal {
     return BigDecimal(this.toPlainString()) // TODO: find a better way than double string conversion
@@ -10,6 +13,7 @@ actual fun Collection<BigDecimal>.sum(): BigDecimal {
 }
 
 
+@JsonDeserialize(using = BigDecimalDeserializer::class)
 actual class BigDecimal actual constructor(decimal: String) : java.math.BigDecimal(decimal) {
 
     actual companion object {

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/Date.kt

@@ -1,8 +1,11 @@
 package net.dankito.utils.multiplatform
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+import net.dankito.utils.multiplatform.serialization.DateDeserializer
 import java.text.DateFormat
 
 
+@JsonDeserialize(using = DateDeserializer::class)
 actual class Date actual constructor(millisSinceEpoch: Long) : java.util.Date(millisSinceEpoch) {
 
     actual constructor() : this(System.currentTimeMillis())

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/File.kt

@@ -1,11 +1,15 @@
 package net.dankito.utils.multiplatform
 
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize
+import net.dankito.utils.multiplatform.serialization.FileDeserializer
+
 
 fun java.io.File.toFile(): File {
     return File(this.absolutePath)
 }
 
 
+@JsonDeserialize(using = FileDeserializer::class)
 actual class File actual constructor(path: String) : java.io.File(path) {
 
     actual constructor(folder: File, filename: String)

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/serialization/BigDecimalDeserializer.kt

@@ -0,0 +1,21 @@
+package net.dankito.utils.multiplatform.serialization
+
+import com.fasterxml.jackson.core.JsonParser
+import com.fasterxml.jackson.databind.DeserializationContext
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer
+import net.dankito.utils.multiplatform.BigDecimal
+
+
+open class BigDecimalDeserializer : StdDeserializer<BigDecimal>(BigDecimal::class.java) {
+
+    override fun deserialize(parser: JsonParser, context: DeserializationContext): BigDecimal? {
+        val doubleString = parser.readValueAs(String::class.java)
+
+        if (doubleString.isNullOrBlank() || doubleString == "null") {
+            return null
+        }
+
+        return BigDecimal(doubleString)
+    }
+
+}

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/serialization/DateDeserializer.kt

@@ -0,0 +1,21 @@
+package net.dankito.utils.multiplatform.serialization
+
+import com.fasterxml.jackson.core.JsonParser
+import com.fasterxml.jackson.databind.DeserializationContext
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer
+import net.dankito.utils.multiplatform.Date
+
+
+open class DateDeserializer : StdDeserializer<Date>(Date::class.java) {
+
+    override fun deserialize(parser: JsonParser, context: DeserializationContext): Date? {
+        val millisSinceEpoch = parser.readValueAs(Long::class.java)
+
+        if (millisSinceEpoch == null) {
+            return null
+        }
+        
+        return Date(millisSinceEpoch)
+    }
+
+}

common/src/jvmMain/kotlin/net/dankito/utils/multiplatform/serialization/FileDeserializer.kt

@@ -0,0 +1,21 @@
+package net.dankito.utils.multiplatform.serialization
+
+import com.fasterxml.jackson.core.JsonParser
+import com.fasterxml.jackson.databind.DeserializationContext
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer
+import net.dankito.utils.multiplatform.File
+
+
+open class FileDeserializer : StdDeserializer<File>(File::class.java) {
+
+    override fun deserialize(parser: JsonParser, context: DeserializationContext): File? {
+        val path = parser.readValueAs(String::class.java)
+
+        if (path == null || path == "null") {
+            return null
+        }
+        
+        return File(path)
+    }
+
+}