NodeSupport: Simplify the code to lookup workspaces a bit

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

analyzer/src/main/kotlin/managers/utils/NodeSupport.kt

@@ -23,13 +23,12 @@ package org.ossreviewtoolkit.analyzer.managers.utils
 
 import com.fasterxml.jackson.core.JsonProcessingException
 import com.fasterxml.jackson.databind.node.ArrayNode
-import com.fasterxml.jackson.databind.node.ObjectNode
 
 import java.io.File
 import java.nio.file.FileSystems
 import java.nio.file.PathMatcher
 
-import org.ossreviewtoolkit.model.readValue
+import org.ossreviewtoolkit.model.readJsonFile
 import org.ossreviewtoolkit.utils.AuthenticatedProxy
 import org.ossreviewtoolkit.utils.ProtocolProxyMap
 import org.ossreviewtoolkit.utils.collectMessagesAsString
@@ -176,7 +175,7 @@ private fun getPackageJsonInfo(definitionFiles: Set<File>): Collection<PackageJs
 
 private fun isYarnWorkspaceRoot(definitionFile: File) =
     try {
-        definitionFile.readValue<ObjectNode>()["workspaces"] != null
+        readJsonFile(definitionFile).has("workspaces")
     } catch (e: JsonProcessingException) {
         e.showStackTrace()
 
@@ -211,7 +210,7 @@ private fun getYarnWorkspaceSubmodules(definitionFiles: Set<File>): Set<File> {
 
 private fun getWorkspaceMatchers(definitionFile: File): List<PathMatcher> {
     var workspaces = try {
-        definitionFile.readValue<ObjectNode>()["workspaces"]
+        readJsonFile(definitionFile).get("workspaces")
     } catch (e: JsonProcessingException) {
         e.showStackTrace()