Implement PNFD Model driven conversion

[sdc.git] / common / onap-tosca-datatype / src / main / java / org / onap / sdc / tosca / services / YamlUtil.java

diff --git a/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/YamlUtil.java b/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/YamlUtil.java
index 4030d3a..4ac60d4 100644 (file)
--- a/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/YamlUtil.java
+++ b/common/onap-tosca-datatype/src/main/java/org/onap/sdc/tosca/services/YamlUtil.java
@@ -16,6 +16,10 @@
 
 package org.onap.sdc.tosca.services;
 
+import java.util.List;
+import java.util.Optional;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.TypeDescription;
 import org.yaml.snakeyaml.Yaml;
@@ -29,6 +33,7 @@ import org.yaml.snakeyaml.nodes.Tag;
 import org.yaml.snakeyaml.parser.ParserException;
 import org.yaml.snakeyaml.representer.Representer;
 
+
 import java.beans.IntrospectionException;
 import java.io.IOException;
 import java.io.InputStream;
@@ -43,6 +48,7 @@ import java.util.Set;
  */
 @SuppressWarnings("unchecked")
 public class YamlUtil {
+    private static final Logger LOGGER = LoggerFactory.getLogger(YamlUtil.class.getName());
 
   private static final String DEFAULT = "default";
   private static final String DEFAULT_STR = "_default";
@@ -140,6 +146,36 @@ public class YamlUtil {
     return (Map<String, LinkedHashMap<String, Object>>) yaml.load(yamlContent);
   }
 
+
+    /**
+     * Parse a YAML file to List
+     *
+     * @param yamlFileInputStream the YAML file input stream
+     * @return The YAML casted as a list
+     */
+    public static Optional<List<Object>> yamlToList(final InputStream yamlFileInputStream) {
+        List<Object> yamlList = null;
+        try {
+            yamlList = (List<Object>) read(yamlFileInputStream);
+        } catch (final ClassCastException ex) {
+            if (LOGGER.isWarnEnabled()) {
+                LOGGER.warn("Could not parse YAML to List.", ex);
+            }
+        }
+        return Optional.ofNullable(yamlList);
+    }
+
+    /**
+     * Parse a YAML file to Object
+     *
+     * @param yamlFileInputStream the YAML file input stream
+     * @return The YAML Object
+     */
+    public static Object read(final InputStream yamlFileInputStream) {
+        final Yaml yaml = new Yaml();
+        return yaml.load(yamlFileInputStream);
+    }
+
   /**
    * Object to yaml string.
    * @param obj the obj