added dataframe-json as excludable dependency to dataframe-csv and dataframe-excel

Author: Jolanrensen

dataframe-csv/build.gradle.kts

@@ -25,6 +25,10 @@ repositories {
 dependencies {
     api(projects.core)
 
+    // for reading/writing JSON <-> DataFrame/DataRow in CSV/TSV/Delim
+    // can safely be excluded when working without JSON and only writing flat dataframes
+    api(projects.dataframeJson)
+
     // for csv reading
     api(libs.deephavenCsv)
     // for csv writing

dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/jsonHelper.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlinx.dataframe.documentation.DelimParams.CSV_DELIMITER
 import org.jetbrains.kotlinx.dataframe.documentation.DelimParams.WRITER_WRITE
 import org.jetbrains.kotlinx.dataframe.io.AdjustCSVFormat
 import org.jetbrains.kotlinx.dataframe.io.QuoteMode
+import org.jetbrains.kotlinx.dataframe.io.toJson
 import org.apache.commons.csv.QuoteMode as ApacheQuoteMode
 
 /**
@@ -57,8 +58,22 @@ internal fun writeDelimImpl(
         df.forEach {
             val values = it.values().map {
                 when (it) {
-                    is AnyRow -> it.toJson()
-                    is AnyFrame -> it.toJson()
+                    is AnyRow -> try {
+                        it.toJson()
+                    } catch (_: NoClassDefFoundError) {
+                        error(
+                            "Encountered a DataFrame when writing to csv/tsv/delim. This needs to be converted to JSON, so the dataframe-json dependency is required.",
+                        )
+                    }
+
+                    is AnyFrame -> try {
+                        it.toJson()
+                    } catch (_: NoClassDefFoundError) {
+                        error(
+                            "Encountered a DataRow when writing to csv/tsv/delim. This needs to be converted to JSON, so the dataframe-json dependency is required.",
+                        )
+                    }
+
                     else -> it
                 }
             }

dataframe-csv/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/io/writeDelim.kt

@@ -17,6 +17,11 @@ repositories {
 dependencies {
     api(projects.core)
     api(libs.poi)
+
+    // for writing DataFrame/DataRow -> JSON in Excel cells
+    // can safely be excluded when writing only flat dataframes
+    api(projects.dataframeJson)
+
     implementation(libs.poi.ooxml)
 
     implementation(libs.kotlin.datetimeJvm)

dataframe-excel/build.gradle.kts

@@ -668,9 +668,25 @@ public fun <T> DataFrame<T>.writeExcel(
 
 private fun Cell.setCellValueByGuessedType(any: Any) =
     when (any) {
-        is AnyRow -> this.setCellValue(any.toJson())
+        is AnyRow -> this.setCellValue(
+            try {
+                any.toJson()
+            } catch (_: NoClassDefFoundError) {
+                error(
+                    "Encountered a DataRow when writing to an Excel cell. This needs to be converted to JSON, so the dataframe-json dependency is required.",
+                )
+            },
+        )
 
-        is AnyFrame -> this.setCellValue(any.toJson())
+        is AnyFrame -> this.setCellValue(
+            try {
+                any.toJson()
+            } catch (_: NoClassDefFoundError) {
+                error(
+                    "Encountered a DataFrame when writing to an Excel cell. This needs to be converted to JSON, so the dataframe-json dependency is required.",
+                )
+            },
+        )
 
         is Number -> this.setCellValue(any.toDouble())