1 files changed, 75 insertions, 0 deletions
diff --git a/sdc-distribution-client/src/main/java/org/onap/sdc/utils/heat/HeatParser.java b/sdc-distribution-client/src/main/java/org/onap/sdc/utils/heat/HeatParser.java
new file mode 100644
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+++ b/sdc-distribution-client/src/main/java/org/onap/sdc/utils/heat/HeatParser.java
@@ -0,0 +1,75 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * sdc-distribution-client
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.utils.heat;
+
+import java.util.Map;
+
+import org.onap.sdc.utils.YamlToObjectConverter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class HeatParser {
+	
+	private static Logger log = LoggerFactory.getLogger(HeatParser.class.getName());
+
+
+	/**
+	 * Parses and returns the contents of the "parameters" section of YAML-formatted HEAT template.
+	 *  
+	 * @param heatFileContents - the string contents of HEAT template
+	 * @return map of parameter name to HeatParameter object.
+	 * For the following YAML snippet:
+	 * <b>parameters:
+	 *		image_name_1:
+	 *			type: string
+	 * 			label: Image Name
+	 * 			description: SCOIMAGE Specify an image name for instance1
+	 * 			default: cirros-0.3.1-x86_64
+	 * </b>
+	 * the map with one entry will be returned, the key will be "image_name_1".
+	 * For a HeatParameter object, getConstraints() returns the list of all constraints,
+	 * regardless of constraint type. 
+	 * For that reason, for each constraint type a sugaring function were added on the HeatParameter type,
+	 * for example getLengthConstraint(). A correct way to fetch the "length" constraint values map would be
+	 * parameter.getLengthConstraint().getLength(). Same logic was implemented for all other constraint types.
+	 * 
+	 * In case of parse error, null will be returned.
+	 * 
+	 */
+	public Map<String, HeatParameter> getHeatParameters(String heatFileContents){
+		log.debug("Start of extracting HEAT parameters from file, file contents: {}", heatFileContents);
+		Map<String, HeatParameter> heatParameters = null;
+		YamlToObjectConverter yamlToObjectConverter = new YamlToObjectConverter();
+		HeatConfiguration heatConfiguration = yamlToObjectConverter.convertFromString(heatFileContents, HeatConfiguration.class);
+		if (heatConfiguration != null){
+			heatParameters = heatConfiguration.getParameters();
+		} else {
+			log.error("Couldn't parse HEAT template.");
+		}
+		if (heatParameters != null && heatParameters.size() > 0){
+			System.out.println("Found HEAT parameters: "+heatParameters.toString());
+			log.debug("Found HEAT parameters: {}", heatParameters.toString());
+		} else {
+			log.warn("HEAT template parameters section wasn't found or is empty.");
+		}
+		return heatParameters;
+	}
+}