From 7c279747beb43c7e88633a6228a155a30e6834f7 Mon Sep 17 00:00:00 2001
From: Benjamin Culkin <scorpress@gmail.com>
Date: Mon, 27 May 2024 11:38:33 -0400
Subject: Initial import

---
 .../israfil/foundation/collections/ArraySet.java   | 105 +++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 israfil-foundation-collections/src/main/java/net/israfil/foundation/collections/ArraySet.java

(limited to 'israfil-foundation-collections/src/main/java/net/israfil/foundation/collections/ArraySet.java')

diff --git a/israfil-foundation-collections/src/main/java/net/israfil/foundation/collections/ArraySet.java b/israfil-foundation-collections/src/main/java/net/israfil/foundation/collections/ArraySet.java
new file mode 100644
index 0000000..3447adc
--- /dev/null
+++ b/israfil-foundation-collections/src/main/java/net/israfil/foundation/collections/ArraySet.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2003 - 2007 Israfil Consulting Services Corporation
+ * Copyright (c) 2003 - 2007 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: ArraySet.java 76 2006-08-03 15:37:05Z cgruber $
+ */
+package net.israfil.foundation.collections;
+
+import java.util.AbstractSet;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+
+/**
+ * An ArrayList backed Set implementation, whose primary purpose is
+ * to provide a Set that maintains the order of elements based on
+ * indexes and/or the order in which items are added.  Most 
+ * particularly it's to guarrantee deterministic results of an
+ * iterator, where the iterator provides each element in the order
+ * of the underlying list.
+ * 
+ * Unlike a LinkedHashSet, this implementation leaves a duplicate
+ * element in its original position.  It's performance characteristics
+ * on input are similar, since a comparison still has to happen 
+ * for de-dupliation, but obtaining the item by index is constant time.
+ * 
+ * TODO: Consider making this a SortedSet, using the list order as the guarrantee.  Not sure if it's a legit use of the API.
+ * @See java.util.LinkedHashSet
+ * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
+ */
+public class ArraySet<E> extends AbstractSet<E>   {
+
+	private transient ArrayList<E> internalList;
+	
+	public ArraySet() {
+		internalList = new ArrayList<E>();
+	}
+
+	public ArraySet(int initialCapacity) {
+		internalList = new ArrayList<E>(initialCapacity);
+	}
+	
+	public ArraySet(Collection<E> col) {
+		internalList = new ArrayList<E>(col);
+		Iterator<E> i = col.iterator();
+		while (i.hasNext()) {
+			internalList.add(i.next());
+		}
+	}
+
+	@Override
+	public Iterator<E> iterator() {
+		return internalList.iterator();
+	}
+
+	@Override
+	public int size() {
+		return internalList.size();
+	}
+
+	@Override
+	public boolean add(E o) {
+		if (internalList.contains(o)) return false;
+		else {
+			internalList.add(o);
+			return true;
+		}
+	}
+
+	@Override
+	public boolean remove(Object o) {
+		return internalList.remove(o);
+	}
+	
+	public E get(Integer index) {
+		return internalList.get(index);
+	}
+}
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