新增 Ref

src/main/java/xyz/zhouxy/plusone/commons/base/Ref.java

@@ -0,0 +1,54 @@
+package xyz.zhouxy.plusone.commons.base;
+
+import java.util.Objects;
+import java.util.function.UnaryOperator;
+
+import com.google.common.annotations.Beta;
+
+@Beta
+public final class Ref<T> {
+
+    private T value;
+
+    public Ref(T value) {
+        this.value = value;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public void setValue(T value) {
+        this.value = value;
+    }
+
+    public void apply(UnaryOperator<T> operator) {
+        this.value = operator.apply(this.value);
+    }
+
+    @Override
+    public String toString() {
+        return String.format("Ref[%s]", value);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Ref<?> other = (Ref<?>) obj;
+        return Objects.equals(this.value, other.value);
+    }
+
+}