1 files changed, 85 insertions, 0 deletions
diff --git a/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/onap/vtp/execution/VTPExecutionResultsSupplier.java b/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/onap/vtp/execution/VTPExecutionResultsSupplier.java
new file mode 100644
index 00000000..3f1e4c57
--- /dev/null
+++ b/vnfmarket-be/vnf-sdk-marketplace/src/main/java/org/onap/vtp/execution/VTPExecutionResultsSupplier.java
@@ -0,0 +1,85 @@
+/**
+ * Copyright 2020 Nokia.
+ *
+ * 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.onap.vtp.execution;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Optional;
+
+public class VTPExecutionResultsSupplier {
+
+    public static final Logger logger = LoggerFactory.getLogger(VTPExecutionResultsSupplier.class);
+
+    private static final String SUB_PATH_TO_EXECUTION_OUTPUT = "/output";
+    private static final Gson gson = new Gson();
+
+    protected String pathToExecutions;
+
+    VTPExecutionResultsSupplier(String pathToExecutions) {
+        this.pathToExecutions = pathToExecutions;
+    }
+
+    public JsonElement getExecutionOutputsFromFile(String executionId) {
+        File directoryWithExecutionFiles = new File(pathToExecutions);
+        return getExecutionFilesForGivenRequest(executionId, directoryWithExecutionFiles)
+            .map(this::getOutputOfLatestExecutionFile)
+            .orElse(createNoOutputFileErrorMessageInJsonFormat());
+    }
+
+    private Optional<File[]> getExecutionFilesForGivenRequest(String requestId, File directoryWithExecutionsData) {
+        return Optional.ofNullable(
+            directoryWithExecutionsData.listFiles((dir, name) -> name.startsWith(requestId))
+        );
+    }
+
+    private JsonElement getOutputOfLatestExecutionFile(File[] directoriesWithExecutionsData) {
+        return Arrays.stream(directoriesWithExecutionsData)
+            .max(Comparator.comparing(File::lastModified))
+            .map(file -> new File(file.getAbsolutePath() + SUB_PATH_TO_EXECUTION_OUTPUT))
+            .filter(File::exists)
+            .map(this::loadOutputJsonFromFile)
+            .orElse(createNoOutputFileErrorMessageInJsonFormat());
+    }
+
+    private JsonArray loadOutputJsonFromFile(File file) {
+        JsonArray outputJson;
+        try {
+            String executionResult = Files.readString(file.toPath());
+            outputJson = gson.fromJson(executionResult, JsonArray.class);
+        } catch (IOException | JsonParseException e) {
+            logger.error(e.getMessage(),e);
+            String errorMessage = "" +
+                "[{ \"error\": \"fail to load execution result\",\"reason\":\"" + e.getMessage() + "\"}]";
+            outputJson = gson.fromJson(errorMessage, JsonArray.class);
+        }
+        return outputJson;
+    }
+
+    private JsonArray createNoOutputFileErrorMessageInJsonFormat() {
+        return gson.fromJson("[{ \"error\": \"unable to find execution results\"}]", JsonArray.class);
+    }
+}