Added BiHashMap

redisson/src/main/java/org/redisson/misc/BiHashMap.java

@@ -0,0 +1,122 @@
+/**
+ * Copyright 2016 Nikita Koksharov
+ *
+ * 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.
+ */
+package org.redisson.misc;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * This is not a concurrent map.
+ * 
+ * @author Rui Gu (https://github.com/jackygurui)
+ * @param <K>
+ * @param <V>
+ */
+public class BiHashMap<K, V> implements Map<K, V> {
+
+    private Map<K, V> keyValueMap = new HashMap<K, V>();
+    private Map<V, K> valueKeyMap = new HashMap<V, K>();
+    
+    @Override
+    public int size() {
+        return keyValueMap.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return keyValueMap.isEmpty();
+    }
+
+    @Override
+    public boolean containsKey(Object key) {
+        return keyValueMap.containsKey(key);
+    }
+
+    @Override
+    public boolean containsValue(Object value) {
+        return valueKeyMap.containsKey(value);
+    }
+
+    @Override
+    public V get(Object key) {
+        return keyValueMap.get(key);
+    }
+    
+    public K reverseGet(Object key) {
+        return valueKeyMap.get(key);
+    }
+
+    @Override
+    public V put(K key, V value) {
+        if (keyValueMap.containsKey(key)) {
+            valueKeyMap.remove(keyValueMap.get(key));
+        }
+        valueKeyMap.put(value, key);
+        return keyValueMap.put(key, value);
+    }
+
+    @Override
+    public V remove(Object key) {
+        V removed = keyValueMap.remove(key);
+        if (removed != null) {
+            valueKeyMap.remove(removed);
+        }
+        return removed;
+    }
+
+    @Override
+    public void putAll(Map<? extends K, ? extends V> m) {
+        for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
+            put(entry.getKey(), entry.getValue());
+        }
+    }
+
+    @Override
+    public void clear() {
+        keyValueMap.clear();
+        valueKeyMap.clear();
+    }
+
+    @Override
+    public Set<K> keySet() {
+        return keyValueMap.keySet();
+    }
+    
+    public Set<V> valueSet() {
+        return valueKeyMap.keySet();
+    }
+
+    @Override
+    public Collection<V> values() {
+        return keyValueMap.values();
+    }
+    
+    public Collection<K> keys() {
+        return valueKeyMap.values();
+    }
+
+    @Override
+    public Set<Entry<K, V>> entrySet() {
+        return keyValueMap.entrySet();
+    }
+    
+    public Set<Entry<V, K>> reverseEntrySet() {
+        return valueKeyMap.entrySet();
+    }
+}