From 866c4fc8174a6f718de9a6254f49760c4466447f Mon Sep 17 00:00:00 2001
From: Robert von Burg <eitch@eitchnet.ch>
Date: Thu, 22 Jul 2021 14:03:34 +0200
Subject: [PATCH] [New] Added StrolchRootElement.setRelations()

---
 .../model/AbstractStrolchRootElement.java     | 54 +++++++++++++++++--
 .../li/strolch/model/StrolchRootElement.java  | 22 ++++----
 2 files changed, 62 insertions(+), 14 deletions(-)

diff --git a/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java b/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java
index 17b47dac3..e5aadf84d 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/AbstractStrolchRootElement.java
@@ -1,9 +1,13 @@
 package li.strolch.model;
 
+import static java.util.Collections.emptyList;
 import static li.strolch.model.StrolchModelConstants.*;
-import static li.strolch.model.builder.BuilderHelper.buildParamId;
 import static li.strolch.model.builder.BuilderHelper.buildParamName;
 
+import java.util.List;
+import java.util.stream.Collectors;
+
+import li.strolch.model.parameter.StringListParameter;
 import li.strolch.model.parameter.StringParameter;
 
 public abstract class AbstractStrolchRootElement extends GroupedParameterizedElement implements StrolchRootElement {
@@ -16,10 +20,7 @@ public abstract class AbstractStrolchRootElement extends GroupedParameterizedEle
 		super(id, name, type);
 	}
 
-	public void setRelation(StrolchRootElement element) {
-		setRelation(buildParamId(element.getType()), element);
-	}
-
+	@Override
 	public void setRelation(String param, StrolchRootElement element) {
 		StringParameter relationP = relationsBag().getParameter(param);
 		if (relationP == null) {
@@ -45,4 +46,47 @@ public abstract class AbstractStrolchRootElement extends GroupedParameterizedEle
 
 		relationP.setValue(element.getId());
 	}
+
+	@Override
+	public void setRelations(String param, List<? extends StrolchRootElement> elements) {
+
+		// validate we have same objects
+		List<String> objectTypes = elements.stream().map(StrolchRootElement::getObjectType).distinct()
+				.collect(Collectors.toList());
+		List<String> types = elements.stream().map(StrolchRootElement::getType).distinct().collect(Collectors.toList());
+		if (objectTypes.size() != 1)
+			throw new IllegalStateException(
+					"Only allow to have one type of object: " + elements.stream().map(StrolchElement::getId)
+							.collect(Collectors.joining(", ")));
+		if (types.size() != 1)
+			throw new IllegalStateException(
+					"Only allow to have one type of object: " + elements.stream().map(StrolchElement::getId)
+							.collect(Collectors.joining(", ")));
+
+		StringListParameter relationsP = relationsBag().getParameter(param);
+		if (relationsP == null) {
+			String name = buildParamName(param);
+			relationsP = new StringListParameter(param, name, emptyList());
+
+			switch (objectTypes.get(0)) {
+			case Tags.RESOURCE:
+				relationsP.setInterpretation(INTERPRETATION_RESOURCE_REF);
+				break;
+			case Tags.ORDER:
+				relationsP.setInterpretation(INTERPRETATION_ORDER_REF);
+				break;
+			case Tags.ACTIVITY:
+				relationsP.setInterpretation(INTERPRETATION_ACTIVITY_REF);
+				break;
+			}
+
+			relationsP.setUom(types.get(0));
+
+			relationsBag().addParameter(relationsP);
+		}
+
+		for (StrolchRootElement element : elements) {
+			relationsP.addValueIfNotContains(element.getId());
+		}
+	}
 }
diff --git a/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java b/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java
index fc01463c7..82eee4140 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/StrolchRootElement.java
@@ -17,6 +17,8 @@ package li.strolch.model;
 
 import static li.strolch.model.StrolchModelConstants.*;
 
+import java.util.List;
+
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonObject;
@@ -79,15 +81,6 @@ public interface StrolchRootElement extends StrolchElement, PolicyContainer, Par
 	 */
 	void setVersion(Version version) throws IllegalArgumentException;
 
-	/**
-	 * Set a relation to the given element by using the type of the given element as the parameter ID, but lower-ccasing
-	 * the first letter. Should the parameter not exist, then it will be created
-	 *
-	 * @param element
-	 * 		the element for which to set the relation to
-	 */
-	void setRelation(StrolchRootElement element);
-
 	/**
 	 * Set a relation to the given element by using the given param. Should the parameter not exist, then it will be
 	 * created
@@ -99,6 +92,17 @@ public interface StrolchRootElement extends StrolchElement, PolicyContainer, Par
 	 */
 	void setRelation(String param, StrolchRootElement element);
 
+	/**
+	 * Set relations to the given elements by using the given param. Should the parameter not exist, then it will be
+	 * created
+	 *
+	 * @param param
+	 * 		the parameter ID on which to set the relations
+	 * @param elements
+	 * 		the elements for which to set the relations to
+	 */
+	void setRelations(String param, List<? extends StrolchRootElement> elements);
+
 	/**
 	 * Return a clone of this {@link StrolchElement}
 	 *