empire-db/src/main/java/org/apache/empire/commons/Unwrappable.java

/*
 * 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 org.apache.empire.commons;

public interface Unwrappable<T>
{
    /**
     * Returns true if the object is a wrapper for another object
     * @return true if its a wrapper or false otherwise
     */
    boolean isWrapper();

    /**
     * Unwrapps am object that is wrapped by this object
     * If the object is not a wrapper then it must return itself (this)!
     * @return the original object
     */
    T unwrap();
}