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+/**
+ * Copyright 2015 JogAmp Community. All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``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 JogAmp Community 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.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package com.jogamp.common.util;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * {@link HashMap} implementation backed by an {@link ArrayList} to preserve order of values.
+ *
+ * Implementation properties are:
+ *  <ul>
+ *  <li> Unique elements utilizing {@link java.lang.Object#hashCode()} for O(1) operations, see below.</li>
+ *  <li> Java 1.5 compatible</li>
+ *  </ul>
+ *
+ * O(1) operations:
+ * <ul>
+ * <li> put new key-value-pair(s) </li>
+ * <li> test for containment </li>
+ * <li> trying to remove non existent elements </li>
+ * </ul>
+ *
+ * O(n) operations:
+ * <ul>
+ * <li> put existing key-value-pair(s) </li>
+ * <li> removing existing elements</li>
+ * </ul>
+ *
+ * For thread safety, the application shall decorate access to instances via
+ * {@link com.jogamp.common.util.locks.RecursiveLock}.
+ *
+*/
+public class ArrayHashMap<K, V>
+    implements Cloneable, Map<K, V>
+{
+    /**
+     * Default load factor: {@value}
+     */
+    public static final float DEFAULT_LOAD_FACTOR = 0.75f;
+    /**
+     * The default initial capacity: {@value}
+     */
+    public static final int DEFAULT_INITIAL_CAPACITY = 16;
+
+    private final HashMap<K,V> map; // key -> object
+    private final ArrayList<V> data; // list of objects
+    private final boolean supportNullValue;
+
+    /**
+     *
+     * @param supportNullValue Use {@code true} for default behavior, i.e. {@code null} can be a valid value.
+     *                         Use {@code false} if {@code null} is not a valid value,
+     *                         here {@link #put(Object, Object)} and {@link #remove(Object)} will be optimized.
+     * @param initialCapacity use {@link #DEFAULT_INITIAL_CAPACITY} for default
+     * @param loadFactor use {@link #DEFAULT_LOAD_FACTOR} for default
+     * @see #supportsNullValue()
+     */
+    public ArrayHashMap(final boolean supportNullValue, final int initialCapacity, final float loadFactor) {
+        this.map  = new HashMap<K,V>(initialCapacity, loadFactor);
+        this.data = new ArrayList<V>(initialCapacity);
+        this.supportNullValue = supportNullValue;
+    }
+
+    /**
+     * @return a shallow copy of this ArrayHashMap, elements are not copied.
+     */
+    public ArrayHashMap(final ArrayHashMap<K, V> o) {
+        map = new HashMap<K, V>(o.map);
+        data = new ArrayList<V>(o.data);
+        supportNullValue = o.supportNullValue;
+    }
+
+    /**
+     * Returns {@code true} for default behavior, i.e. {@code null} can be a valid value.
+     * <p>
+     * Returns {@code false} if {@code null} is not a valid value,
+     * here {@link #put(Object, Object)} and {@link #remove(Object)} are optimized operations.
+     * </p>
+     * @see #ArrayHashMap(boolean, int, float)
+     */
+    public final boolean supportsNullValue() { return supportNullValue; }
+
+    //
+    // Cloneable
+    //
+
+    /**
+     * Implementation uses {@link #ArrayHashMap(ArrayHashMap)}.
+     * @return a shallow copy of this ArrayHashMap, elements are not copied.
+     */
+    @Override
+    public final Object clone() {
+        return new ArrayHashMap<K, V>(this);
+    }
+
+    /**
+     * Returns this object ordered ArrayList. Use w/ care, it's not a copy.
+     * @see #toArrayList()
+     */
+    public final ArrayList<V> getData() { return data; }
+
+    /**
+     * @return a shallow copy of this ArrayHashMap's ArrayList, elements are not copied.
+     * @see #getData()
+     */
+    public final ArrayList<V> toArrayList() {
+        return new ArrayList<V>(data);
+    }
+
+    /** Returns this object hash map. Use w/ care, it's not a copy. */
+    public final HashMap<K,V> getMap() { return map; }
+
+    @Override
+    public final String toString() { return data.toString(); }
+
+    //
+    // Map
+    //
+
+    @Override
+    public final void clear() {
+        data.clear();
+        map.clear();
+    }
+
+    @Override
+    public Set<K> keySet() {
+        return map.keySet();
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * See {@link #getData()} and {@link #toArrayList()}.
+     * </p>
+     * @see #getData()
+     * @see #toArrayList()
+     */
+    @Override
+    public Collection<V> values() {
+        return map.values();
+    }
+
+    @Override
+    public Set<java.util.Map.Entry<K, V>> entrySet() {
+        return map.entrySet();
+    }
+
+    @Override
+    public final V get(final Object key) {
+        return map.get(key);
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * This is an O(1) operation, in case the key does not exist,
+     * otherwise O(n).
+     * </p>
+     * @throws NullPointerException if {@code value} is {@code null} but {@link #supportsNullValue()} == {@code false}
+     */
+    @Override
+    public final V put(final K key, final V value) throws NullPointerException {
+        final V oldValue;
+        if( supportNullValue ) {
+            // slow path
+            final boolean exists = map.containsKey(key);
+            if(!exists) {
+                // !exists
+                if( null != ( oldValue = map.put(key, value) ) ) {
+                    // slips a valid null ..
+                    throw new InternalError("Already existing, but checked before: "+key+" -> "+oldValue);
+                }
+            } else {
+                // exists
+                oldValue = map.put(key, value);
+                if( !data.remove(oldValue) ) {
+                    throw new InternalError("Already existing, but not in list: "+oldValue);
+                }
+            }
+        } else {
+            checkNullValue(value);
+            // fast path
+            if( null != ( oldValue = map.put(key, value) ) ) {
+                // exists
+                if( !data.remove(oldValue) ) {
+                    throw new InternalError("Already existing, but not in list: "+oldValue);
+                }
+            }
+        }
+        if(!data.add(value)) {
+            throw new InternalError("Couldn't add value to list: "+value);
+        }
+        return oldValue;
+    }
+
+    @Override
+    public void putAll(final Map<? extends K, ? extends V> m) {
+        for (final Iterator<? extends Map.Entry<? extends K, ? extends V>> i = m.entrySet().iterator(); i.hasNext(); ) {
+            final Map.Entry<? extends K, ? extends V> e = i.next();
+            put(e.getKey(), e.getValue());
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     * <p>
+     * This is an O(1) operation, in case the key does not exist,
+     * otherwise O(n).
+     * </p>
+     */
+    @Override
+    public final V remove(final Object key) {
+        if( supportNullValue ) {
+            if( map.containsKey(key) ) {
+                // exists
+                final V oldValue = map.remove(key);
+                if ( !data.remove(oldValue) ) {
+                    throw new InternalError("Couldn't remove prev mapped pair: "+key+" -> "+oldValue);
+                }
+                return oldValue;
+            }
+        } else {
+            final V oldValue;
+            if ( null != (oldValue = map.remove(key) ) ) {
+                // exists
+                if ( !data.remove(oldValue) ) {
+                    throw new InternalError("Couldn't remove prev mapped pair: "+key+" -> "+oldValue);
+                }
+            }
+            return oldValue;
+        }
+        return null;
+    }
+
+    @Override
+    public final boolean containsKey(final Object key) {
+        return map.containsKey(key);
+    }
+
+    @Override
+    public boolean containsValue(final Object value) {
+        return map.containsValue(value);
+    }
+
+    @Override
+    public final boolean equals(final Object arrayHashMap) {
+        if ( !(arrayHashMap instanceof ArrayHashMap) ) {
+            return false;
+        }
+        return map.equals(((ArrayHashMap<?,?>)arrayHashMap).map);
+    }
+
+    @Override
+    public final int hashCode() {
+        return map.hashCode();
+    }
+
+    @Override
+    public final boolean isEmpty() {
+        return data.isEmpty();
+    }
+
+    @Override
+    public final int size() {
+        return data.size();
+    }
+
+    private static final void checkNullValue(final Object value) throws NullPointerException {
+        if( null == value ) {
+            throw new NullPointerException("Null value not supported");
+        }
+    }
+}