NONRTRIC - Implement DMaaP mediator producer service in Java

[nonrtric.git] / dmaap-adaptor-java / src / main / java / org / oran / dmaapadapter / repository / MultiMap.java

diff --git a/dmaap-adaptor-java/src/main/java/org/oran/dmaapadapter/repository/MultiMap.java b/dmaap-adaptor-java/src/main/java/org/oran/dmaapadapter/repository/MultiMap.java
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+/*-
+ * ========================LICENSE_START=================================
+ * O-RAN-SC
+ * %%
+ * Copyright (C) 2019-2021 Nordix Foundation
+ * %%
+ * 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.oran.dmaapadapter.repository;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Vector;
+
+/**
+ * A map, where each key can be bound to may values (where each value has an own
+ * ID)
+ */
+public class MultiMap<T> {
+
+    private final Map<String, Map<String, T>> map = new HashMap<>();
+
+    public void put(String key, String id, T value) {
+        this.map.computeIfAbsent(key, k -> new HashMap<>()).put(id, value);
+    }
+
+    public T remove(String key, String id) {
+        Map<String, T> innerMap = this.map.get(key);
+        if (innerMap != null) {
+            T removedElement = innerMap.remove(id);
+            if (innerMap.isEmpty()) {
+                this.map.remove(key);
+            }
+            return removedElement;
+        }
+        return null;
+    }
+
+    public Collection<T> get(String key) {
+        Map<String, T> innerMap = this.map.get(key);
+        if (innerMap == null) {
+            return Collections.emptyList();
+        }
+        return new Vector<>(innerMap.values());
+    }
+
+    public void clear() {
+        this.map.clear();
+    }
+
+}