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Carefully designed and efficient extension of the Java Collections Framework with primitive specializations and more, built for Java 8 (Implementation)

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/*
 * Copyright 2014 the original author or authors.
 *
 * Licensed 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.koloboke.collect.impl.hash;

import com.koloboke.collect.*;
import com.koloboke.collect.impl.InternalObjCollectionOps;
import com.koloboke.collect.set.hash.HashObjSet;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.function.Consumer;
import java.util.function.Predicate;
import com.koloboke.collect.impl.NotGenerated;

import com.koloboke.collect.set.ObjSet;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

import javax.annotation.Nonnull;

import java.util.*;


public abstract class MutableSeparateKVObjQHashGO
        extends MutableSeparateKVObjQHashSO {

    @Nonnull
    @Override
    public Object[] keys() {
        return set;
    }


    @Override
    public int capacity() {
        return set.length;
    }

    public void forEach(Consumer action) {
        if (action == null)
            throw new java.lang.NullPointerException();
        if (this.isEmpty())
            return;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    action.accept(key);
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    action.accept(key);
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
    }


    public boolean forEachWhile(
            Predicate
            predicate) {
        if (predicate == null)
            throw new java.lang.NullPointerException();
        if (this.isEmpty())
            return true;
        boolean terminated = false;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    if (!predicate.test(key)) {
                        terminated = true;
                        break;
                    }
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    if (!predicate.test(key)) {
                        terminated = true;
                        break;
                    }
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return !terminated;
    }

    public boolean allContainingIn(ObjCollection c) {
        if (this.isEmpty())
            return true;
        boolean containsAll = true;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    if (!c.contains(key)) {
                        containsAll = false;
                        break;
                    }
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    if (!c.contains(key)) {
                        containsAll = false;
                        break;
                    }
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return containsAll;
    }


    public boolean reverseAddAllTo(ObjCollection c) {
        if (this.isEmpty())
            return false;
        boolean changed = false;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    changed |= c.add(key);
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    changed |= c.add(key);
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }


    public boolean reverseRemoveAllFrom(ObjSet s) {
        if (this.isEmpty() || s.isEmpty())
            return false;
        boolean changed = false;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    changed |= s.remove(key);
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    changed |= s.remove(key);
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }



    public ObjIterator iterator() {
        int mc = modCount();
        if (!noRemoved())
            return new SomeRemovedIterator(
                mc);
        return new NoRemovedIterator(mc);
    }

    public ObjCursor setCursor() {
        int mc = modCount();
        if (!noRemoved())
            return new SomeRemovedCursor(mc);
        return new NoRemovedCursor(mc);
    }

    @Nonnull
    public Object[] toArray() {
        int size = size();
        Object[] result = new Object[size];
        if (size == 0)
            return result;
        int resultIndex = 0;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    result[resultIndex++] = key;
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    result[resultIndex++] = key;
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return result;
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    public  T[] toArray(@Nonnull T[] a) {
        int size = size();
        if (a.length < size) {
            Class elementType = a.getClass().getComponentType();
            a = (T[]) java.lang.reflect.Array.newInstance(elementType, size);
        }
        if (size == 0) {
            if (a.length > 0)
                a[0] = null;
            return a;
        }
        int resultIndex = 0;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    a[resultIndex++] = (T) key;
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    a[resultIndex++] = (T) key;
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        if (a.length > resultIndex)
            a[resultIndex] = null;
        return a;
    }



    public int setHashCode() {
        int hashCode = 0;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    hashCode += nullableKeyHashCode(key);
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    hashCode += nullableKeyHashCode(key);
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return hashCode;
    }


    public String setToString() {
        if (this.isEmpty())
            return "[]";
        StringBuilder sb = new StringBuilder();
        int elementCount = 0;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    sb.append(' ').append(key != (Object) this ? key : "(this Collection)").append(',');
                    if (++elementCount == 8) {
                        int expectedLength = sb.length() * (size() / 8);
                        sb.ensureCapacity(expectedLength + (expectedLength / 2));
                    }
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    sb.append(' ').append(key != (Object) this ? key : "(this Collection)").append(',');
                    if (++elementCount == 8) {
                        int expectedLength = sb.length() * (size() / 8);
                        sb.ensureCapacity(expectedLength + (expectedLength / 2));
                    }
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        sb.setCharAt(0, '[');
        sb.setCharAt(sb.length() - 1, ']');
        return sb.toString();
    }


    abstract boolean justRemove(E key);

    public boolean removeIf(Predicate filter) {
        if (filter == null)
            throw new java.lang.NullPointerException();
        if (this.isEmpty())
            return false;
        boolean changed = false;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    if (filter.test(key)) {
                        incrementModCount();
                        mc++;
                        keys[i] = REMOVED;
                        postRemoveHook();
                        changed = true;
                    }
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    if (filter.test(key)) {
                        incrementModCount();
                        mc++;
                        keys[i] = REMOVED;
                        postRemoveHook();
                        changed = true;
                    }
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }



    boolean removeAll(@Nonnull HashObjSet thisC, @Nonnull Collection c) {
        if (thisC == (Object) c)
            throw new IllegalArgumentException();
        if (this.isEmpty() || c.isEmpty())
            return false;
        boolean changed = false;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    if (c.contains(key)) {
                        incrementModCount();
                        mc++;
                        keys[i] = REMOVED;
                        postRemoveHook();
                        changed = true;
                    }
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    if (c.contains(key)) {
                        incrementModCount();
                        mc++;
                        keys[i] = REMOVED;
                        postRemoveHook();
                        changed = true;
                    }
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }



    boolean retainAll(@Nonnull HashObjSet thisC, @Nonnull Collection c) {
        if (thisC == (Object) c)
            throw new IllegalArgumentException();
        if (this.isEmpty())
            return false;
        if (c.isEmpty()) {
            clear();
            return true;
        }
        boolean changed = false;
        int mc = modCount();
        Object[] keys = set;
        if (noRemoved()) {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE) {
                    if (!c.contains(key)) {
                        incrementModCount();
                        mc++;
                        keys[i] = REMOVED;
                        postRemoveHook();
                        changed = true;
                    }
                }
            }
        } else {
            for (int i = keys.length - 1; i >= 0; i--) {
                E key;
                // noinspection unchecked
                if ((key = (E) keys[i]) != FREE && key != REMOVED) {
                    if (!c.contains(key)) {
                        incrementModCount();
                        mc++;
                        keys[i] = REMOVED;
                        postRemoveHook();
                        changed = true;
                    }
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }





    class NoRemovedIterator implements ObjIterator {
        final Object[] keys;
        int expectedModCount;
        int index = -1;
        int nextIndex;
        E next;

        NoRemovedIterator(int mc) {
            expectedModCount = mc;
            Object[] keys = this.keys = set;
            int nextI = keys.length;
            while (--nextI >= 0) {
                Object key;
                if ((key = keys[nextI]) != FREE) {
                    // noinspection unchecked
                    next = (E) key;
                    break;
                }
            }
            nextIndex = nextI;
        }


        @Override
        public void forEachRemaining(Consumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            Object[] keys = this.keys;
            int nextI = nextIndex;
            for (int i = nextI; i >= 0; i--) {
                Object key;
                if ((key = keys[i]) != FREE) {
                    // noinspection unchecked
                    action.accept((E) key);
                }
            }
            if (nextI != nextIndex || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            index = nextIndex = -1;
        }


        @Override
        public boolean hasNext() {
            return nextIndex >= 0;
        }

        @Override
        public E next() {
            if (expectedModCount == modCount()) {
                int nextI;
                if ((nextI = nextIndex) >= 0) {
                    index = nextI;
                    Object[] keys = this.keys;
                    E prev = next;
                    while (--nextI >= 0) {
                        Object key;
                        if ((key = keys[nextI]) != FREE) {
                            // noinspection unchecked
                            next = (E) key;
                            break;
                        }
                    }
                    nextIndex = nextI;
                    return prev;
                } else {
                    throw new java.util.NoSuchElementException();
                }
            } else {
                throw new java.util.ConcurrentModificationException();
            }
        }

        @Override
        public void remove() {
            int index;
            if ((index = this.index) >= 0) {
                if (expectedModCount++ == modCount()) {
                    this.index = -1;
                    incrementModCount();
                    keys[index] = REMOVED;
                    postRemoveHook();
                } else {
                    throw new java.util.ConcurrentModificationException();
                }
            } else {
                throw new java.lang.IllegalStateException();
            }
        }
    }


    class NoRemovedCursor implements ObjCursor {
        final Object[] keys;
        int expectedModCount;
        int index;
        Object curKey;

        NoRemovedCursor(int mc) {
            expectedModCount = mc;
            this.keys = set;
            index = keys.length;
            curKey = FREE;
        }

        @Override
        public void forEachForward(Consumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            Object[] keys = this.keys;
            int index = this.index;
            for (int i = index - 1; i >= 0; i--) {
                Object key;
                if ((key = keys[i]) != FREE) {
                    // noinspection unchecked
                    action.accept((E) key);
                }
            }
            if (index != this.index || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            this.index = -1;
            curKey = FREE;
        }

        @Override
        public E elem() {
            Object curKey;
            if ((curKey = this.curKey) != FREE) {
                // noinspection unchecked
                return (E) curKey;
            } else {
                throw new java.lang.IllegalStateException();
            }
        }

        @Override
        public boolean moveNext() {
            if (expectedModCount == modCount()) {
                Object[] keys = this.keys;
                for (int i = index - 1; i >= 0; i--) {
                    Object key;
                    if ((key = keys[i]) != FREE) {
                        index = i;
                        curKey = key;
                        return true;
                    }
                }
                curKey = FREE;
                index = -1;
                return false;
            } else {
                throw new java.util.ConcurrentModificationException();
            }
        }

        @Override
        public void remove() {
            if (curKey != FREE) {
                if (expectedModCount++ == modCount()) {
                    this.curKey = FREE;
                    incrementModCount();
                    keys[index] = REMOVED;
                    postRemoveHook();
                } else {
                    throw new java.util.ConcurrentModificationException();
                }
            } else {
                throw new java.lang.IllegalStateException();
            }
        }
    }


    class SomeRemovedIterator implements ObjIterator {
        final Object[] keys;
        int expectedModCount;
        int index = -1;
        int nextIndex;
        E next;

        SomeRemovedIterator(int mc) {
            expectedModCount = mc;
            Object[] keys = this.keys = set;
            int nextI = keys.length;
            while (--nextI >= 0) {
                Object key;
                if ((key = keys[nextI]) != FREE && key != REMOVED) {
                    // noinspection unchecked
                    next = (E) key;
                    break;
                }
            }
            nextIndex = nextI;
        }


        @Override
        public void forEachRemaining(Consumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            Object[] keys = this.keys;
            int nextI = nextIndex;
            for (int i = nextI; i >= 0; i--) {
                Object key;
                if ((key = keys[i]) != FREE && key != REMOVED) {
                    // noinspection unchecked
                    action.accept((E) key);
                }
            }
            if (nextI != nextIndex || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            index = nextIndex = -1;
        }


        @Override
        public boolean hasNext() {
            return nextIndex >= 0;
        }

        @Override
        public E next() {
            if (expectedModCount == modCount()) {
                int nextI;
                if ((nextI = nextIndex) >= 0) {
                    index = nextI;
                    Object[] keys = this.keys;
                    E prev = next;
                    while (--nextI >= 0) {
                        Object key;
                        if ((key = keys[nextI]) != FREE && key != REMOVED) {
                            // noinspection unchecked
                            next = (E) key;
                            break;
                        }
                    }
                    nextIndex = nextI;
                    return prev;
                } else {
                    throw new java.util.NoSuchElementException();
                }
            } else {
                throw new java.util.ConcurrentModificationException();
            }
        }

        @Override
        public void remove() {
            int index;
            if ((index = this.index) >= 0) {
                if (expectedModCount++ == modCount()) {
                    this.index = -1;
                    incrementModCount();
                    keys[index] = REMOVED;
                    postRemoveHook();
                } else {
                    throw new java.util.ConcurrentModificationException();
                }
            } else {
                throw new java.lang.IllegalStateException();
            }
        }
    }


    class SomeRemovedCursor implements ObjCursor {
        final Object[] keys;
        int expectedModCount;
        int index;
        Object curKey;

        SomeRemovedCursor(int mc) {
            expectedModCount = mc;
            this.keys = set;
            index = keys.length;
            curKey = FREE;
        }

        @Override
        public void forEachForward(Consumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            Object[] keys = this.keys;
            int index = this.index;
            for (int i = index - 1; i >= 0; i--) {
                Object key;
                if ((key = keys[i]) != FREE && key != REMOVED) {
                    // noinspection unchecked
                    action.accept((E) key);
                }
            }
            if (index != this.index || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            this.index = -1;
            curKey = FREE;
        }

        @Override
        public E elem() {
            Object curKey;
            if ((curKey = this.curKey) != FREE) {
                // noinspection unchecked
                return (E) curKey;
            } else {
                throw new java.lang.IllegalStateException();
            }
        }

        @Override
        public boolean moveNext() {
            if (expectedModCount == modCount()) {
                Object[] keys = this.keys;
                for (int i = index - 1; i >= 0; i--) {
                    Object key;
                    if ((key = keys[i]) != FREE && key != REMOVED) {
                        index = i;
                        curKey = key;
                        return true;
                    }
                }
                curKey = FREE;
                index = -1;
                return false;
            } else {
                throw new java.util.ConcurrentModificationException();
            }
        }

        @Override
        public void remove() {
            if (curKey != FREE) {
                if (expectedModCount++ == modCount()) {
                    this.curKey = FREE;
                    incrementModCount();
                    keys[index] = REMOVED;
                    postRemoveHook();
                } else {
                    throw new java.util.ConcurrentModificationException();
                }
            } else {
                throw new java.lang.IllegalStateException();
            }
        }
    }

}




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