Add multi document Yaml file loading

Issue-ID: VNFSDK-594
Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
Change-Id: Ic4feb908b57bd6ff4f2903559dbc5b92836e2c33

3 files changed, 128 insertions, 0 deletions

diff --git a/csarvalidation/src/main/java/org/onap/validation/yaml/YamlLoader.java b/csarvalidation/src/main/java/org/onap/validation/yaml/YamlLoader.java
new file mode 100644
index 0000000..804f1ea
--- /dev/null
+++ b/csarvalidation/src/main/java/org/onap/validation/yaml/YamlLoader.java
@@ -0,0 +1,51 @@
+/*
+ * 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.validation.yaml;
+
+import org.onap.validation.yaml.model.YamlDocument;
+import org.onap.validation.yaml.model.YamlDocumentFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.yaml.snakeyaml.Yaml;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+public class YamlLoader {
+
+    private static final Logger LOGGER =  LoggerFactory.getLogger(YamlLoader.class);
+
+    public List<YamlDocument> loadMultiDocumentYamlFile(URL path)
+        throws YamlDocumentFactory.YamlDocumentParsingException {
+        List<YamlDocument> documentsFromFile = new ArrayList<>();
+        try (InputStream yamlStream = path.openStream()) {
+            for (Object yamlDocument : new Yaml().loadAll(yamlStream)) {
+                documentsFromFile.add(
+                    new YamlDocumentFactory().createYamlDocument(yamlDocument)
+                );
+            }
+        } catch (IOException e) {
+            LOGGER.error("Failed to load multi document YAML file",e);
+        }
+        return documentsFromFile;
+    }
+
+}
diff --git a/csarvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocument.java b/csarvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocument.java
new file mode 100644
index 0000000..5ed4690
--- /dev/null
+++ b/csarvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocument.java
@@ -0,0 +1,35 @@
+/*
+ * 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.validation.yaml.model;
+
+import java.util.Map;
+
+public class YamlDocument {
+
+    private final Map<String, ?> yaml;
+
+    public YamlDocument(Map<String, ?> yaml) {
+        this.yaml = yaml;
+    }
+
+    public Map<String, ?> getYaml() {
+        return yaml;
+    }
+}
+
+
diff --git a/csarvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocumentFactory.java b/csarvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocumentFactory.java
new file mode 100644
index 0000000..8e571a9
--- /dev/null
+++ b/csarvalidation/src/main/java/org/onap/validation/yaml/model/YamlDocumentFactory.java
@@ -0,0 +1,42 @@
+/*
+ * 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.validation.yaml.model;
+
+import java.util.Map;
+
+public class YamlDocumentFactory {
+
+    public YamlDocument createYamlDocument(Object yaml) throws YamlDocumentParsingException {
+        try {
+            Map<String, ?> parsedYaml = (Map<String, ?>) yaml;
+            return new YamlDocument(parsedYaml);
+        } catch (ClassCastException e) {
+            throw new YamlDocumentParsingException(
+                String.format("Fail to parse given objects: %s as yaml",yaml), e
+            );
+        }
+    }
+
+    public static class YamlDocumentParsingException extends Exception {
+
+        YamlDocumentParsingException(String message, Throwable throwable) {
+            super(message, throwable);
+        }
+    }
+
+}