select base or location package (#115)

Author: hauner

openapi-processor-core/src/main/kotlin/io/openapiprocessor/core/writer/java/PackageSelector.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2025 https://github.com/openapi-processor/openapi-processor-base
+ * PDX-License-Identifier: Apache-2.0
+ */
+
+package io.openapiprocessor.core.writer.java
+
+import io.openapiprocessor.core.converter.options.PackageOptions
+import java.net.URI
+
+class PackageSelector(private val options: PackageOptions) {
+
+    fun getPackageName(subPackage: String): String {
+        return toPackageName(subPackage)
+    }
+
+    fun getPackageName(location: URI, subPackage: String): String {
+        if (options.location == null) {
+            // create package from packageName option
+            return toPackageName(subPackage)
+        }
+
+        val locationPackage = toPackage(location)
+        val childPackage = getChildPackage(locationPackage)
+        if (childPackage != null) {
+            return childPackage
+        }
+
+        return toPackageName(subPackage)
+    }
+
+    private fun toPackageName(subPackage: String): String {
+        return listOf(options.base, subPackage).joinToString(".")
+    }
+
+    private fun toPackage(location: URI): String {
+        return location
+            .resolve(".")
+            .path
+            .replace("/", ".")
+            .dropLast(1) // file name
+    }
+
+    private fun getChildPackage(locationPackage: String): String? {
+        val childIndex = locationPackage.indexOf(options.location!!)
+        if (childIndex == -1) {
+            return null
+        }
+
+        val pkgName = locationPackage.substring(childIndex)
+        return pkgName
+    }
+}

openapi-processor-core/src/test/kotlin/io/openapiprocessor/core/writer/java/PackageSelectorSpec.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2025 https://github.com/openapi-processor/openapi-processor-base
+ * PDX-License-Identifier: Apache-2.0
+ */
+
+package io.openapiprocessor.core.writer.java
+
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+import io.openapiprocessor.core.converter.options.PackageOptions
+import java.net.URI
+
+class PackageSelectorSpec : StringSpec({
+
+    "crates package name from base" {
+        val options = PackageOptions().apply {
+            base = "io.openapiprocessor.base"
+            location = null
+        }
+
+        val calc = PackageSelector(options)
+        val pkg = calc.getPackageName(URI("project/src/api/openapi.yaml"), "api")
+
+        pkg.shouldBe("io.openapiprocessor.base.api")
+    }
+
+    "creates package name from location" {
+        val options = PackageOptions().apply {
+            base = "io.openapiprocessor.base"
+            location = "io.openapiprocessor.location"
+        }
+
+        val calc = PackageSelector(options)
+        val pkg = calc.getPackageName(URI("project/src/java/io.openapiprocessor/location/somewhere/resource.yaml"), "api")
+
+        pkg.shouldBe("io.openapiprocessor.location.somewhere")
+    }
+})