Answer expression catalog

catalog/build.gradle.kts

@@ -56,6 +56,7 @@ dependencies {
   implementation(Dependencies.Navigation.navUiKtx)
 
   implementation(project(path = ":datacapture"))
+  implementation(project(path = ":engine"))
   implementation(project(path = ":contrib:barcode"))
 
   testImplementation(Dependencies.junit)

catalog/src/main/AndroidManifest.xml

@@ -24,6 +24,7 @@
     />
 
     <application
+        android:name=".CatalogApplication"
         android:allowBackup="true"
         android:icon="@mipmap/ic_card_file_box"
         android:label="@string/app_name"

catalog/src/main/assets/behavior_answer_expression.json

@@ -0,0 +1,34 @@
+{
+  "resourceType": "Questionnaire",
+  "item": [
+    {
+      "extension": [
+        {
+          "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-answerExpression",
+          "valueExpression": {
+            "language": "application/x-fhir-query",
+            "expression": "Task?subject=Patient/P1&code=33879002&status=ready&_sort=period"
+          }
+        },
+        {
+          "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-choiceColumn",
+          "extension": [
+            {
+              "url": "path",
+              "valueString": "description + ' - ' + reasonCode.coding.where(system='http://snomed.info/sct').display"
+            },
+            {
+              "url": "forDisplay",
+              "valueBoolean": true
+            }
+          ]
+        }
+      ],
+      "linkId": "vaccines",
+      "text": "Which vaccine tasks were completed?",
+      "type": "reference",
+      "required": true,
+      "repeats": true
+    }
+  ]
+}

catalog/src/main/assets/resource_data_bundle.json

@@ -0,0 +1,116 @@
+{
+  "resourceType": "Bundle",
+  "entry": [
+    {
+      "resource": {
+        "resourceType" : "Patient",
+        "id" : "P1"
+      }
+    },
+    {
+      "resource": {
+        "resourceType": "Task",
+        "id": "b8e13d21-1a62-4172-a9ef-57670e6ac238",
+        "status": "ready",
+        "code": {
+          "coding": [
+            {
+              "system": "http://snomed.info/sct",
+              "code": "33879002",
+              "display": "Vaccination routine"
+            }
+          ]
+        },
+        "description": "BCG at birth",
+        "for": {
+          "reference": "Patient/P1"
+        },
+        "reasonCode": {
+          "coding": [
+            {
+              "system": "http://snomed.info/sct",
+              "code": "42284007",
+              "display": "BCG vaccine"
+            },
+            {
+              "system": "https://smartregister.org/immunization/vaccine-codes",
+              "code": "bcg",
+              "display": "BCG"
+            }
+          ],
+          "text": "BCG"
+        }
+      }
+    },
+    {
+      "resource": {
+        "resourceType": "Task",
+        "id": "4090ba9a-fbbb-4634-a06d-0cbe938ab090",
+        "status": "cancelled",
+        "code": {
+          "coding": [
+            {
+              "system": "http://snomed.info/sct",
+              "code": "33879002",
+              "display": "Vaccination routine"
+            }
+          ]
+        },
+        "description": "OPV 0 at birth",
+        "for": {
+          "reference": "Patient/P1"
+        },
+        "reasonCode": {
+          "coding": [
+            {
+              "system": "http://snomed.info/sct",
+              "code": "111164008",
+              "display": "Poliovirus vaccine"
+            },
+            {
+              "system": "https://smartregister.org/immunization/vaccine-codes",
+              "code": "opv0",
+              "display": "OPV 0"
+            }
+          ],
+          "text": "OPV 0"
+        }
+      }
+    },
+    {
+      "resource": {
+        "resourceType": "Task",
+        "id": "087e82c6-e346-4725-8db1-7e10aec99be9",
+        "status": "ready",
+        "code": {
+          "coding": [
+            {
+              "system": "http://snomed.info/sct",
+              "code": "33879002",
+              "display": "Vaccination routine"
+            }
+          ]
+        },
+        "description": "OPV 1 at 6 weeks",
+        "for": {
+          "reference": "Patient/P1"
+        },
+        "reasonCode": {
+          "coding": [
+            {
+              "system": "http://snomed.info/sct",
+              "code": "111164008",
+              "display": "Poliovirus vaccine"
+            },
+            {
+              "system": "https://smartregister.org/immunization/vaccine-codes",
+              "code": "opv1",
+              "display": "OPV 1"
+            }
+          ],
+          "text": "OPV 1"
+        }
+      }
+    }
+  ]
+}

catalog/src/main/java/com/google/android/fhir/catalog/BehaviorListViewModel.kt

@@ -38,6 +38,11 @@ class BehaviorListViewModel(application: Application) : AndroidViewModel(applica
       R.string.behavior_name_calculated_expression,
       "behavior_calculated_expression.json",
     ),
+    ANSWER_EXPRESSION(
+      R.drawable.ic_answers_behavior,
+      R.string.behavior_name_answer_expression,
+      "behavior_answer_expression.json",
+    ),
     CONTEXT_VARIABLES(
       R.drawable.ic_context,
       R.string.behavior_name_context_variables,

catalog/src/main/java/com/google/android/fhir/catalog/CatalogApplication.kt

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2022-2023 Google LLC
+ *
+ * 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 com.google.android.fhir.catalog
+
+import android.app.Application
+import ca.uhn.fhir.context.FhirContext
+import com.google.android.fhir.FhirEngine
+import com.google.android.fhir.FhirEngineConfiguration
+import com.google.android.fhir.FhirEngineProvider
+import com.google.android.fhir.datacapture.DataCaptureConfig
+import com.google.android.fhir.search.search
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import org.hl7.fhir.r4.model.Bundle
+
+class CatalogApplication : Application(), DataCaptureConfig.Provider {
+  // Only initiate the FhirEngine when used for the first time, not when the app is created.
+  private val fhirEngine: FhirEngine by lazy { FhirEngineProvider.getInstance(this) }
+
+  private lateinit var dataCaptureConfig: DataCaptureConfig
+
+  override fun onCreate() {
+    super.onCreate()
+
+    FhirEngineProvider.init(FhirEngineConfiguration())
+
+    dataCaptureConfig =
+      DataCaptureConfig(xFhirQueryResolver = { fhirEngine.search(it).map { it.resource } })
+
+    CoroutineScope(Dispatchers.IO).launch {
+      assets
+        .open("resource_data_bundle.json")
+        .bufferedReader()
+        .use { bufferedReader -> bufferedReader.readText() }
+        .let { stringValue ->
+          FhirContext.forR4Cached().newJsonParser().parseResource(stringValue) as Bundle
+        }
+        .entry
+        .map { bundleEntryComponent -> bundleEntryComponent.resource }
+        .let { resources -> fhirEngine.create(*resources.toTypedArray()) }
+    }
+  }
+
+  override fun getDataCaptureConfig(): DataCaptureConfig = dataCaptureConfig
+}

catalog/src/main/java/com/google/android/fhir/catalog/DemoQuestionnaireFragment.kt

@@ -34,12 +34,14 @@ import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.NavHostFragment
 import androidx.navigation.fragment.findNavController
 import androidx.navigation.fragment.navArgs
+import ca.uhn.fhir.context.FhirContext
 import com.google.android.fhir.catalog.ModalBottomSheetFragment.Companion.BUNDLE_ERROR_KEY
 import com.google.android.fhir.catalog.ModalBottomSheetFragment.Companion.REQUEST_ERROR_KEY
 import com.google.android.fhir.datacapture.QuestionnaireFragment
 import com.google.android.fhir.datacapture.QuestionnaireFragment.Companion.SUBMIT_REQUEST_KEY
 import com.google.android.material.card.MaterialCardView
 import kotlinx.coroutines.launch
+import org.hl7.fhir.r4.model.Patient
 
 class DemoQuestionnaireFragment : Fragment() {
   private val viewModel: DemoQuestionnaireViewModel by viewModels()
@@ -164,7 +166,15 @@ class DemoQuestionnaireFragment : Fragment() {
         setReorderingAllowed(true)
         replace(
           R.id.container,
-          QuestionnaireFragment.builder().setQuestionnaire(questionnaireJsonString).build(),
+          QuestionnaireFragment.builder()
+            .setQuestionnaire(questionnaireJsonString)
+            .setQuestionnaireLaunchContexts(
+              FhirContext.forR4Cached()
+                .newJsonParser()
+                .encodeResourceToString(Patient().apply { id = "P1" })
+                .let { listOf(it) },
+            )
+            .build(),
           QUESTIONNAIRE_FRAGMENT_TAG,
         )
       }

catalog/src/main/res/drawable/ic_answers_behavior.xml

@@ -0,0 +1,23 @@
+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="194dp"
+    android:height="128dp"
+    android:viewportWidth="194"
+    android:viewportHeight="128"
+>
+  <group>
+    <clip-path
+            android:pathData="M194,64C194,78.359 182.359,90 168,90L0,90L0,38L168,38C182.359,38 194,49.641 194,64V64Z"
+        />
+    <path
+            android:pathData="M128,76C128,79.866 124.866,83 121,83L-1,83L-1,45L121,45C124.866,45 128,48.134 128,52L128,76Z"
+            android:strokeWidth="2"
+            android:fillColor="#ffffff"
+            android:strokeColor="#4285F4"
+        />
+  </group>
+  <path
+        android:pathData="M101.5,61L109,68.5L116.5,61H101.5Z"
+        android:fillColor="#1A73E8"
+    />
+</vector>

catalog/src/main/res/values/strings.xml

@@ -58,6 +58,7 @@
     <string
         name="behavior_name_calculated_expression"
     >Calculated Expression</string>
+    <string name="behavior_name_answer_expression">Answer Expression</string>
     <string name="toolbar_text">Structured data capture \n Catalog</string>
     <string
         name="questionnaire_response_title"