feat: Export no-op report processor maven artifact. (#1841)

src/main/kotlin/org/wfanet/measurement/reporting/postprocessing/README.md

@@ -0,0 +1,9 @@
+# Report Post Processing Library
+
+## Maven Artifact
+
+This library is available as a Maven artifact from a GitHub Packages Maven
+registry. See
+[Installing a package](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-apache-maven-registry#installing-a-package)
+from the GitHub documentation. The primary artifact is
+`org.wfanet.measurement.eventdataprovider:postprocessing-v2alpha`.

src/main/kotlin/org/wfanet/measurement/reporting/postprocessing/v2alpha/BUILD.bazel

@@ -0,0 +1,21 @@
+load("@rules_jvm_external//:defs.bzl", "maven_export")
+load("@wfa_common_jvm//build/maven:defs.bzl", "artifact_version")
+load("@wfa_rules_kotlin_jvm//kotlin:defs.bzl", "kt_jvm_library")
+
+package(default_visibility = ["//visibility:public"])
+
+MAVEN_COORDINATES = "org.wfanet.measurement.reporting:postprocessing-v2alpha:" + artifact_version()
+
+kt_jvm_library(
+    name = "postprocessing",
+    srcs = glob(["*.kt"]),
+    tags = ["maven_coordinates=" + MAVEN_COORDINATES],
+)
+
+maven_export(
+    name = "postprocessing_maven",
+    lib_name = "postprocessing",
+    maven_coordinates = MAVEN_COORDINATES,
+    tags = ["no-javadocs"],
+    visibility = ["//visibility:private"],
+)

src/main/kotlin/org/wfanet/measurement/reporting/postprocessing/v2alpha/NoOpReportProcessor.kt

@@ -0,0 +1,26 @@
+// Copyright 2024 The Cross-Media Measurement Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package org.wfanet.measurement.reporting.postprocessing.v2alpha
+
+/**
+ * A no-op implementation of [ReportProcessor] that takes a serialized [Report] in JSON format and
+ * returns the same [Report] without any modifications.
+ */
+class NoOpReportProcessor : ReportProcessor {
+  /** Returns the input [report] without any modifications. */
+  override fun processReportJson(report: String): String {
+    return report
+  }
+}

src/main/kotlin/org/wfanet/measurement/reporting/postprocessing/v2alpha/ReportProcessor.kt

@@ -0,0 +1,26 @@
+// Copyright 2024 The Cross-Media Measurement Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package org.wfanet.measurement.reporting.postprocessing.v2alpha
+
+/** Corrects the inconsistent measurements in a serialized [Report]. */
+interface ReportProcessor {
+  /**
+   * Processes a serialized [Report] and outputs a consistent one.
+   *
+   * @param report The serialized [Report] in JSON format.
+   * @return The corrected serialized [Report] in JSON format.
+   */
+  fun processReportJson(report: String): String
+}

src/test/kotlin/org/wfanet/measurement/reporting/postprocessing/v2alpha/BUILD.bazel

@@ -0,0 +1,16 @@
+load("@wfa_rules_kotlin_jvm//kotlin:defs.bzl", "kt_jvm_test")
+
+package(default_testonly = True)
+
+kt_jvm_test(
+    name = "no_op_report_processor_test",
+    srcs = ["NoOpReportProcessorTest.kt"],
+    test_class = "org.wfanet.measurement.reporting.postprocessing.v2alpha.NoOpReportProcessorTest",
+    deps = [
+        "//src/main/kotlin/org/wfanet/measurement/reporting/postprocessing/v2alpha:postprocessing",
+        "@wfa_common_jvm//imports/java/com/google/common/truth",
+        "@wfa_common_jvm//imports/java/com/google/common/truth/extensions/proto",
+        "@wfa_common_jvm//imports/java/org/junit",
+        "@wfa_common_jvm//imports/kotlin/kotlin/test",
+    ],
+)

src/test/kotlin/org/wfanet/measurement/reporting/postprocessing/v2alpha/NoOpReportProcessorTest.kt

@@ -0,0 +1,46 @@
+// Copyright 2024 The Cross-Media Measurement Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package org.wfanet.measurement.reporting.postprocessing.v2alpha
+
+import com.google.common.truth.Truth.assertThat
+import com.google.common.truth.extensions.proto.ProtoTruth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(JUnit4::class)
+class NoOpReportProcessorTest {
+  @Test
+  fun `The default report processor successfully processes a report`() {
+    val reportProcessor = NoOpReportProcessor()
+    val processedReport = reportProcessor.processReportJson(SAMPLE_REPORT)
+    assertThat(processedReport).isEqualTo(SAMPLE_REPORT)
+  }
+
+  companion object {
+    private val SAMPLE_REPORT =
+      """
+      {
+        "name": "Sample report",
+        "reportingMetricEntries": [],
+        "state": "STATE_UNSPECIFIED",
+        "metricCalculationResults": [],
+        "reportSchedule": "",
+        "tags": {},
+        "reportingInterval": {}
+      }
+      """
+  }
+}