From 648a47890c7aced58c27a7db78e4c5b43dbf6c88 Mon Sep 17 00:00:00 2001
From: Robert von Burg <eitch@eitchnet.ch>
Date: Wed, 20 Jan 2021 18:21:05 +0100
Subject: [PATCH] [New] Added ParameterizedElement.streamStringList()

---
 .../strolch/model/ParameterBagContainer.java   | 15 +++++++++++++++
 .../li/strolch/model/ParameterizedElement.java | 18 ++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/li.strolch.model/src/main/java/li/strolch/model/ParameterBagContainer.java b/li.strolch.model/src/main/java/li/strolch/model/ParameterBagContainer.java
index 990bdd2cb..77a0c8b56 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/ParameterBagContainer.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/ParameterBagContainer.java
@@ -1238,6 +1238,21 @@ public interface ParameterBagContainer extends StrolchElement {
 	 */
 	List<String> getRelationIds(String paramKey) throws StrolchModelException;
 
+	/**
+	 * Returns a stream over the values of the {@link StringListParameter} with the given key from the {@link
+	 * ParameterBag} with the ID {@link StrolchModelConstants#BAG_RELATIONS}, if the {@link Parameter} or the {@link
+	 * ParameterBag} does not exist, then a {@link StrolchModelException} is thrown
+	 *
+	 * @param paramKey
+	 * 		the key of the {@link StringParameter} for which the value is to be returned
+	 *
+	 * @return a stream over the the parameter's values
+	 *
+	 * @throws StrolchModelException
+	 * 		if the parameter does not exist
+	 */
+	Stream<String> streamRelationIds(String paramKey) throws StrolchModelException;
+
 	/**
 	 * Sets the value of the {@link StringParameter} with the given key on the {@link ParameterBag} with the ID {@link
 	 * StrolchModelConstants#BAG_RELATIONS}, if the {@link Parameter} or the {@link ParameterBag} does not exist, then a
diff --git a/li.strolch.model/src/main/java/li/strolch/model/ParameterizedElement.java b/li.strolch.model/src/main/java/li/strolch/model/ParameterizedElement.java
index e2913c620..e5dbae75c 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/ParameterizedElement.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/ParameterizedElement.java
@@ -271,6 +271,24 @@ public abstract class ParameterizedElement extends AbstractStrolchElement {
 		return param.getValue();
 	}
 
+	/**
+	 * Returns a {@link Stream} over the elements of the {@link StringListParameter} with the given paramKey
+	 *
+	 * @param paramKey
+	 * 		the key of the parameter for which to return the value
+	 *
+	 * @return a stream over the values of the parameter with the given paramKey
+	 *
+	 * @throws StrolchModelException
+	 * 		if the parameter does not exist
+	 */
+	public Stream<String> streamStringList(String paramKey) throws StrolchModelException {
+		StringListParameter param = getParameter(paramKey, false);
+		if (param == null)
+			return Stream.empty();
+		return param.streamValues();
+	}
+
 	/**
 	 * Returns the value of the {@link IntegerListParameter} with the given paramKey
 	 *