From 7c279747beb43c7e88633a6228a155a30e6834f7 Mon Sep 17 00:00:00 2001 From: Benjamin Culkin Date: Mon, 27 May 2024 11:38:33 -0400 Subject: Initial import --- .../container/util/NonDuplicateStack.java | 55 ++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/NonDuplicateStack.java (limited to 'israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/NonDuplicateStack.java') diff --git a/israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/NonDuplicateStack.java b/israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/NonDuplicateStack.java new file mode 100644 index 0000000..d253024 --- /dev/null +++ b/israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/NonDuplicateStack.java @@ -0,0 +1,55 @@ +/* + * Copyright (c) 2008 Israfil Consulting Services Corporation + * Copyright (c) 2008 Christian Edward Gruber + * All Rights Reserved + * + * This software is licensed under the Berkeley Standard Distribution license, + * (BSD license), as defined below: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of Israfil Consulting Services nor the names of its contributors + * may be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, + * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * $Id: Copyright.java 618 2008-04-14 14:03:03Z christianedwardgruber $ + */ +package net.israfil.foundation.container.util; + +import java.util.Stack; + +/** + * A simple stack object which throws an IllegalArgumentException if an + * attempt is made to push an object already contained within the stack. + * + * Primarily used for circular reference detection. + * + * @author Christian Edward Gruber + */ +public class NonDuplicateStack extends Stack { + + private static final long serialVersionUID = -5777711467165769847L; + + public T push(T item) { + if (contains(item)) throw new IllegalArgumentException("Duplicate item."); + return super.push(item); + } + +} -- cgit v1.2.3