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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.InternalIntCollectionOps;
import com.koloboke.collect.set.hash.HashIntSet;
import java.util.function.IntConsumer;
import java.util.function.IntPredicate;
import java.util.function.Consumer;
import java.util.function.Predicate;
import com.koloboke.collect.impl.NotGenerated;

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

import javax.annotation.Nonnull;

import java.util.*;


public abstract class UpdatableParallelKVIntQHashGO
        extends UpdatableParallelKVIntQHashSO {

    @Nonnull
    @Override
    public long[] table() {
        return table;
    }


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

    public void forEach(Consumer action) {
        if (action == null)
            throw new java.lang.NullPointerException();
        if (this.isEmpty())
            return;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                action.accept(key);
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
    }

    public void forEach(IntConsumer action) {
        if (action == null)
            throw new java.lang.NullPointerException();
        if (this.isEmpty())
            return;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                action.accept(key);
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
    }

    public boolean forEachWhile(
            IntPredicate
            predicate) {
        if (predicate == null)
            throw new java.lang.NullPointerException();
        if (this.isEmpty())
            return true;
        boolean terminated = false;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                if (!predicate.test(key)) {
                    terminated = true;
                    break;
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return !terminated;
    }

    public boolean allContainingIn(IntCollection c) {
        if (this.isEmpty())
            return true;
        boolean containsAll = true;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                if (!c.contains(key)) {
                    containsAll = false;
                    break;
                }
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return containsAll;
    }


    public boolean reverseAddAllTo(IntCollection c) {
        if (this.isEmpty())
            return false;
        boolean changed = false;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                changed |= c.add(key);
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }


    public boolean reverseRemoveAllFrom(IntSet s) {
        if (this.isEmpty() || s.isEmpty())
            return false;
        boolean changed = false;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                changed |= s.removeInt(key);
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return changed;
    }



    public IntIterator iterator() {
        int mc = modCount();
        return new NoRemovedIterator(mc);
    }

    public IntCursor setCursor() {
        int mc = modCount();
        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();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                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();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                a[resultIndex++] = (T) Integer.valueOf(key);
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        if (a.length > resultIndex)
            a[resultIndex] = null;
        return a;
    }

    @Nonnull
    public int[] toIntArray() {
        int size = size();
        int[] result = new int[size];
        if (size == 0)
            return result;
        int resultIndex = 0;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                result[resultIndex++] = key;
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        return result;
    }

    @Nonnull
    public int[] toArray(int[] a) {
        int size = size();
        if (a.length < size)
            a = new int[size];
        if (size == 0) {
            if (a.length > 0)
                a[0] = 0;
            return a;
        }
        int resultIndex = 0;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                a[resultIndex++] = key;
            }
        }
        if (mc != modCount())
            throw new java.util.ConcurrentModificationException();
        if (a.length > resultIndex)
            a[resultIndex] = 0;
        return a;
    }


    public int setHashCode() {
        int hashCode = 0;
        int mc = modCount();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                hashCode += 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();
        int free = freeValue;
        long[] tab = table;
        long base = LONG_BASE + INT_KEY_OFFSET;
        for (long off = ((long) tab.length) << LONG_SCALE_SHIFT; (off -= LONG_SCALE) >= 0L;) {
            int key;
            if ((key = U.getInt(tab, base + off)) != free) {
                sb.append(' ').append(key).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(int key);

    public boolean removeIf(Predicate filter) {
        throw new java.lang.UnsupportedOperationException();
    }

    public boolean removeIf(IntPredicate filter) {
        throw new java.lang.UnsupportedOperationException();
    }


    boolean removeAll(@Nonnull HashIntSet thisC, @Nonnull Collection c) {
        throw new java.lang.UnsupportedOperationException();
    }

    boolean removeAll(@Nonnull HashIntSet thisC, @Nonnull IntCollection c) {
        throw new java.lang.UnsupportedOperationException();
    }



    boolean retainAll(@Nonnull HashIntSet thisC, @Nonnull Collection c) {
        if (c instanceof IntCollection)
            return retainAll(thisC, (IntCollection) c);
        throw new java.lang.UnsupportedOperationException();
    }

    private boolean retainAll(@Nonnull HashIntSet thisC, @Nonnull IntCollection c) {
        throw new java.lang.UnsupportedOperationException();
    }





    class NoRemovedIterator implements IntIterator {
        final long[] tab;
        final int free;
        int expectedModCount;
        int nextIndex;
        int next;

        NoRemovedIterator(int mc) {
            expectedModCount = mc;
            long[] tab = this.tab = table;
            int free = this.free = freeValue;
            int nextI = tab.length;
            long entry;
            while (--nextI >= 0) {
                int key;
                if ((key = (int) (entry = tab[nextI])) != free) {
                    next = key;
                    break;
                }
            }
            nextIndex = nextI;
        }

        @Override
        public int nextInt() {
            if (expectedModCount == modCount()) {
                int nextI;
                if ((nextI = nextIndex) >= 0) {
                    long[] tab = this.tab;
                    int free = this.free;
                    int prev = next;
                    long entry;
                    while (--nextI >= 0) {
                        int key;
                        if ((key = (int) (entry = tab[nextI])) != free) {
                            next = key;
                            break;
                        }
                    }
                    nextIndex = nextI;
                    return prev;
                } else {
                    throw new java.util.NoSuchElementException();
                }
            } else {
                throw new java.util.ConcurrentModificationException();
            }
        }

        @Override
        public void forEachRemaining(Consumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            long[] tab = this.tab;
            int free = this.free;
            long entry;
            int nextI = nextIndex;
            for (int i = nextI; i >= 0; i--) {
                int key;
                if ((key = (int) (entry = tab[i])) != free) {
                    action.accept(key);
                }
            }
            if (nextI != nextIndex || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            nextIndex = -1;
        }

        @Override
        public void forEachRemaining(IntConsumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            long[] tab = this.tab;
            int free = this.free;
            long entry;
            int nextI = nextIndex;
            for (int i = nextI; i >= 0; i--) {
                int key;
                if ((key = (int) (entry = tab[i])) != free) {
                    action.accept(key);
                }
            }
            if (nextI != nextIndex || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            nextIndex = -1;
        }

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

        @Override
        public Integer next() {
            return nextInt();
        }

        @Override
        public void remove() {
            throw new java.lang.UnsupportedOperationException();
        }
    }


    class NoRemovedCursor implements IntCursor {
        final long[] tab;
        final int free;
        int expectedModCount;
        int index;
        int curKey;

        NoRemovedCursor(int mc) {
            expectedModCount = mc;
            this.tab = table;
            index = tab.length;
            int free = this.free = freeValue;
            curKey = free;
        }

        @Override
        public void forEachForward(IntConsumer action) {
            if (action == null)
                throw new java.lang.NullPointerException();
            int mc = expectedModCount;
            long[] tab = this.tab;
            int free = this.free;
            long entry;
            int index = this.index;
            for (int i = index - 1; i >= 0; i--) {
                int key;
                if ((key = (int) (entry = tab[i])) != free) {
                    action.accept(key);
                }
            }
            if (index != this.index || mc != modCount()) {
                throw new java.util.ConcurrentModificationException();
            }
            this.index = -1;
            curKey = free;
        }

        @Override
        public int elem() {
            int curKey;
            if ((curKey = this.curKey) != free) {
                return curKey;
            } else {
                throw new java.lang.IllegalStateException();
            }
        }

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

        @Override
        public void remove() {
            throw new java.lang.UnsupportedOperationException();
        }
    }

}




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