创建 MapWrapper 包装 Map 的操作。

src/main/java/xyz/zhouxy/plusone/commons/util/AbstractMapWrapper.java

@@ -0,0 +1,108 @@
+package xyz.zhouxy.plusone.commons.util;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+import javax.annotation.Nullable;
+
+import com.google.common.annotations.Beta;
+
+@Beta
+public abstract class AbstractMapWrapper<K, V, T extends AbstractMapWrapper<K, V, T>> {
+
+    private final Map<K, V> map;
+    private final Consumer<K> keyChecker;
+    private final Consumer<V> valueChecker;
+
+    protected AbstractMapWrapper(Map<K, V> map, @Nullable Consumer<K> keyChecker, @Nullable Consumer<V> valueChecker) {
+        this.map = map;
+        this.keyChecker = keyChecker;
+        this.valueChecker = valueChecker;
+    }
+
+    public final T put(K key, V value) {
+        if (this.keyChecker != null) {
+            this.keyChecker.accept(key);
+        }
+        if (this.valueChecker != null) {
+            this.valueChecker.accept(value);
+        }
+        this.map.put(key, value);
+        return getSelf();
+    }
+
+    public final T putAll(Map<? extends K, ? extends V> m) {
+        for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
+            put(entry.getKey(), entry.getValue());
+        }
+        return getSelf();
+    }
+
+    public final Optional<V> get(K key) {
+        if (this.map.containsKey(key)) {
+            return Optional.ofNullable(this.map.get(key));
+        }
+        throw new IllegalArgumentException("Key does not exist");
+    }
+
+    @SuppressWarnings("unchecked")
+    public final <R> Optional<R> getAndConvert(K key) {
+        return get(key).map(v -> (R) v);
+    }
+
+    public final <R> Optional<R> getAndConvert(K key, Function<V, R> mapper) {
+        return get(key).map(mapper);
+    }
+
+    public final boolean containsKey(Object key) {
+        return this.map.containsKey(key);
+    }
+
+    public final int size() {
+        return this.map.size();
+    }
+
+    public final Set<K> keySet() {
+        return this.map.keySet();
+    }
+
+    public final Collection<V> values() {
+        return this.map.values();
+    }
+
+    public final Set<Entry<K, V>> entrySet() {
+        return this.map.entrySet();
+    }
+
+    public final void clear() {
+        this.map.clear();
+    }
+
+    public final boolean containsValue(Object value) {
+        return this.map.containsValue(value);
+    }
+
+    public final boolean isEmpty() {
+        return this.map.isEmpty();
+    }
+
+    public final V remove(Object key) {
+        return this.map.remove(key);
+    }
+
+    public final Map<K, V> exportMap() {
+        return this.map;
+    }
+
+    public final Map<K, V> exportUnmodifiableMapMap() {
+        return Collections.unmodifiableMap(this.map);
+    }
+
+    protected abstract T getSelf();
+}

src/main/java/xyz/zhouxy/plusone/commons/util/MapWrapper.java

@@ -0,0 +1,101 @@
+package xyz.zhouxy.plusone.commons.util;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import java.util.function.Consumer;
+
+import javax.annotation.Nullable;
+
+import com.google.common.annotations.Beta;
+
+@Beta
+public final class MapWrapper<K, V> extends AbstractMapWrapper<K, V, MapWrapper<K, V>> {
+
+    private MapWrapper(Map<K, V> map, Consumer<K> keyChecker, Consumer<V> valueChecker) {
+        super(map, keyChecker, valueChecker);
+    }
+
+    public static <K, V> Builder<K, V> wrap(Map<K, V> map) {
+        return new Builder<>(map);
+    }
+
+    public static <K, V> Builder<K, V> wrapHashMap() {
+        return new Builder<>(new HashMap<>());
+    }
+
+    public static <K, V> Builder<K, V> wrapHashMap(int initialCapacity) {
+        return new Builder<>(new HashMap<>(initialCapacity));
+    }
+
+    public static <K, V> Builder<K, V> wrapHashMap(int initialCapacity, float loadFactor) {
+        return new Builder<>(new HashMap<>(initialCapacity, loadFactor));
+    }
+
+    public static <K, V> Builder<K, V> wrapTreeMap() {
+        return new Builder<>(new TreeMap<>());
+    }
+
+    public static <K, V> Builder<K, V> wrapTreeMap(SortedMap<K, ? extends V> m) {
+        return new Builder<>(new TreeMap<>(m));
+    }
+
+    public static <K, V> Builder<K, V> wrapTreeMap(Comparator<? super K> comparator) {
+        return new Builder<>(new TreeMap<>(comparator));
+    }
+
+    public static final class Builder<K, V> {
+        private final Map<K, V> map;
+        private Consumer<K> keyChecker;
+        private Consumer<V> valueChecker;
+
+        private Builder(Map<K, V> map) {
+            this.map = map;
+        }
+
+        public Builder<K, V> keyChecker(@Nullable Consumer<K> keyChecker) {
+            this.keyChecker = keyChecker;
+            return this;
+        }
+
+        public Builder<K, V> valueChecker(@Nullable Consumer<V> valueChecker) {
+            this.valueChecker = valueChecker;
+            return this;
+        }
+
+        public Builder<K, V> put(K key, V value) {
+            if (this.keyChecker != null) {
+                this.keyChecker.accept(key);
+            }
+            if (this.valueChecker != null) {
+                this.valueChecker.accept(value);
+            }
+            this.map.put(key, value);
+            return this;
+        }
+
+        public Builder<K, V> putAll(Map<? extends K, ? extends V> m) {
+            for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
+                put(entry.getKey(), entry.getValue());
+            }
+            return this;
+        }
+
+        public MapWrapper<K, V> build() {
+            return new MapWrapper<>(map, keyChecker, valueChecker);
+        }
+
+        public MapWrapper<K, V> buildUnmodifiableMap() {
+            return new MapWrapper<>(Collections.unmodifiableMap(map), keyChecker, valueChecker);
+        }
+    }
+
+    @Override
+    protected MapWrapper<K, V> getSelf() {
+        return this;
+    }
+}