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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 com.hazelcast.org.apache.calcite.util;

/**
 * A mutable slot that can contain one object.
 *
 * 

A holder is useful for implementing OUT or IN-OUT parameters.

* *

It is possible to sub-class to receive events on get or set.

* * @param Element type */ public class Holder { private E e; /** Creates a Holder containing a given value. * *

Call this method from a derived constructor or via the {@link #of} * method. */ protected Holder(E e) { this.e = e; } /** Sets the value. */ public void set(E e) { this.e = e; } /** Gets the value. */ public E get() { return e; } /** Creates a holder containing a given value. */ public static Holder of(E e) { return new Holder<>(e); } }





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