#115 support cleanup

platform/support/support/pom.xml

@@ -46,6 +46,14 @@
       <artifactId>snakeyaml</artifactId>
       <scope>compile</scope>
     </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-core</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+    </dependency>     
     <dependency>
 	  <groupId>de.iip-ecosphere.platform</groupId>
 	  <artifactId>maven-python</artifactId>

platform/support/support/src/main/java/de/iip_ecosphere/platform/support/CollectionUtils.java

@@ -0,0 +1,106 @@
+/**
+ * ******************************************************************************
+ * Copyright (c) {2020} The original author or authors
+ *
+ * All rights reserved. This program and the accompanying materials are made 
+ * available under the terms of the Eclipse Public License 2.0 which is available 
+ * at http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+ * which is available at https://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR EPL-2.0
+ ********************************************************************************/
+
+package de.iip_ecosphere.platform.support;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Some useful additional collection methods.
+ * 
+ * @author Holger Eichelberger, SSE
+ */
+public class CollectionUtils {
+
+    /**
+     * Turns given {@code elements} into a list.
+     * 
+     * @param <T> the element type
+     * @param elements the elements
+     * @return the list containing all {@code elements}
+     */
+    @SafeVarargs
+    public static <T> List<T> toList(T... elements) {
+        List<T> result = new ArrayList<T>();
+        for (T e : elements) {
+            result.add(e);
+        }
+        return result;
+    }
+
+    /**
+     * Turns given {@code elements} to {@code list}.
+     * 
+     * @param <T> the element type
+     * @param list the list to be modified as a side effect
+     * @param elements the elements
+     * @return the list with all {@code elements} added
+     */
+    @SafeVarargs
+    public static <T> List<T> addAll(List<T> list, T... elements) {
+        for (T e : elements) {
+            list.add(e);
+        }
+        return list;
+    }
+
+    /**
+     * Turns given {@code elements} to {@code set}.
+     * 
+     * @param <T> the element type
+     * @param set the set to be modified as a side effect
+     * @param elements the elements
+     * @return the set with all {@code elements} added
+     */
+    @SafeVarargs
+    public static <T> Set<T> addAll(Set<T> set, T... elements) {
+        for (T e : elements) {
+            set.add(e);
+        }
+        return set;
+    }
+
+    /**
+     * Turns the elements in the iterator into a list.
+     * 
+     * @param <T> the element type
+     * @param iterator the iterator
+     * @return the list with all elements in {@code iterator}
+     */
+    public static <T> List<T> toList(Iterator<T> iterator) {
+        List<T> result = new ArrayList<T>();
+        while (iterator.hasNext()) {
+            result.add(iterator.next());
+        }
+        return result;
+    }
+
+    /**
+     * Turns the elements in the iterator into a set.
+     * 
+     * @param <T> the element type
+     * @param iterator the iterator
+     * @return the set with all elements in {@code iterator}
+     */
+    public static <T> Set<T> toSet(Iterator<T> iterator) {
+        Set<T> result = new HashSet<T>();
+        while (iterator.hasNext()) {
+            result.add(iterator.next());
+        }
+        return result;
+    }
+
+}