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/*
* Copyright (C) 2002-2022 Sebastiano Vigna
*
* 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 it.unimi.dsi.fastutil.floats;
import java.util.Collection;
import java.util.Objects;
import java.util.function.Consumer;
import it.unimi.dsi.fastutil.doubles.DoubleIterator;
import it.unimi.dsi.fastutil.doubles.DoubleIterators;
import it.unimi.dsi.fastutil.doubles.DoubleSpliterator;
import it.unimi.dsi.fastutil.doubles.DoubleSpliterators;
import it.unimi.dsi.fastutil.objects.ObjectArrays;
/** A class providing static methods and objects that do useful things with type-specific collections.
*
* @see java.util.Collections
*/
public final class FloatCollections {
private FloatCollections() {}
/* Only in the EmptyCollection class, where performance is critical, do we override the
* deprecated, Object based functional methods. For the rest, we just override the
* non-deprecated type-specific method, and let the default method from the interface
* filter into that. This is an extra method call and lambda creation, but it isn't worth
* complexifying the code generation for a case that is already marked as being inefficient.
*/
/** An immutable class representing an empty type-specific collection.
*
* This class may be useful to implement your own in case you subclass
* a type-specific collection.
*/
public abstract static class EmptyCollection extends AbstractFloatCollection {
protected EmptyCollection() {}
@Override
public boolean contains(float k) { return false; }
@Override
public Object[] toArray() { return ObjectArrays.EMPTY_ARRAY; }
@Override
public T[] toArray(T[] array) {
if (array.length > 0) array[0] = null;
return array;
}
@Override
public FloatBidirectionalIterator iterator() { return FloatIterators.EMPTY_ITERATOR; }
@Override
public FloatSpliterator spliterator() { return FloatSpliterators.EMPTY_SPLITERATOR; }
@Override
public int size() { return 0; }
@Override
public void clear() {}
@Override
public int hashCode() { return 0; }
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (! (o instanceof Collection)) return false;
return ((Collection)o).isEmpty();
}
@Deprecated
@Override
public void forEach(final Consumer action) { }
@Override
public boolean containsAll(final Collection c) { return c.isEmpty(); }
@Override
public boolean addAll(final Collection c) { throw new UnsupportedOperationException(); }
@Override
public boolean removeAll(final Collection c) { throw new UnsupportedOperationException(); }
@Override
public boolean retainAll(final Collection c) { throw new UnsupportedOperationException(); }
@Deprecated
@Override
public boolean removeIf(final java.util.function.Predicate filter) {
Objects.requireNonNull(filter);
return false;
}
@Override
public float[] toFloatArray() { return FloatArrays.EMPTY_ARRAY; }
/* {@inheritDoc}
* @deprecated Please use {@code toArray()} instead—this method is redundant and will be removed in the future.
*/
@Deprecated
@Override
public float[] toFloatArray(float[] a) { return a; }
@Override
public void forEach(final FloatConsumer action) { }
@Override
public boolean containsAll(final FloatCollection c) { return c.isEmpty(); }
@Override
public boolean addAll(final FloatCollection c) { throw new UnsupportedOperationException(); }
@Override
public boolean removeAll(final FloatCollection c) { throw new UnsupportedOperationException(); }
@Override
public boolean retainAll(final FloatCollection c) { throw new UnsupportedOperationException(); }
@Override
public boolean removeIf(final FloatPredicate filter) {
Objects.requireNonNull(filter);
return false;
}
@Override
public DoubleIterator doubleIterator() { return DoubleIterators.EMPTY_ITERATOR; }
@Override
public DoubleSpliterator doubleSpliterator() { return DoubleSpliterators.EMPTY_SPLITERATOR; }
}
/** A synchronized wrapper class for collections. */
static class SynchronizedCollection implements FloatCollection , java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final FloatCollection collection;
protected final Object sync;
protected SynchronizedCollection(final FloatCollection c, final Object sync) {
this.collection = Objects.requireNonNull(c);
this.sync = sync;
}
protected SynchronizedCollection(final FloatCollection c) {
this.collection = Objects.requireNonNull(c);
this.sync = this;
}
@Override
public boolean add(final float k) { synchronized(sync) { return collection.add(k); } }
@Override
public boolean contains(final float k) { synchronized(sync) { return collection.contains(k); } }
@Override
public boolean rem(final float k) { synchronized(sync) { return collection.rem(k); } }
@Override
public int size() { synchronized(sync) { return collection.size(); } }
@Override
public boolean isEmpty() { synchronized(sync) { return collection.isEmpty(); } }
@Override
public float[] toFloatArray() { synchronized(sync) { return collection.toFloatArray(); } }
@Override
public Object[] toArray() { synchronized(sync) { return collection.toArray(); } }
/* {@inheritDoc}
* @deprecated Please use {@code toArray()} instead—this method is redundant and will be removed in the future.
*/
@Deprecated
@Override
public float[] toFloatArray(final float[] a) { return toArray(a); }
@Override
public float[] toArray(final float[] a) { synchronized(sync) { return collection.toArray(a); } }
@Override
public boolean addAll(final FloatCollection c) { synchronized(sync) { return collection.addAll(c); } }
@Override
public boolean containsAll(final FloatCollection c) { synchronized(sync) { return collection.containsAll(c); } }
@Override
public boolean removeAll(final FloatCollection c) { synchronized(sync) { return collection.removeAll(c); } }
@Override
public boolean retainAll(final FloatCollection c) { synchronized(sync) { return collection.retainAll(c); } }
@Override
@Deprecated
public boolean add(final Float k) { synchronized(sync) { return collection.add(k); } }
@Override
@Deprecated
public boolean contains(final Object k) { synchronized(sync) { return collection.contains(k); } }
@Override
@Deprecated
public boolean remove(final Object k) { synchronized(sync) { return collection.remove(k); } }
@Override
public DoubleIterator doubleIterator() { return collection.doubleIterator(); }
@Override
public DoubleSpliterator doubleSpliterator() { return collection.doubleSpliterator(); }
@Override
public java.util.stream.DoubleStream doubleStream() { return collection.doubleStream(); }
@Override
public java.util.stream.DoubleStream doubleParallelStream() { return collection.doubleParallelStream(); }
@Override
public T[] toArray(final T[] a) { synchronized(sync) { return collection.toArray(a); } }
@Override
public FloatIterator iterator() { return collection.iterator(); }
@Override
public FloatSpliterator spliterator() { return collection.spliterator(); }
@Deprecated
@Override
public java.util.stream.Stream stream() { return collection.stream(); }
@Deprecated
@Override
public java.util.stream.Stream parallelStream() { return collection.parallelStream(); }
@Override
public void forEach(final FloatConsumer action) { synchronized(sync) { collection.forEach(action); } }
@Override
public boolean addAll(final Collection c) { synchronized(sync) { return collection.addAll(c); } }
@Override
public boolean containsAll(final Collection c) { synchronized(sync) { return collection.containsAll(c); } }
@Override
public boolean removeAll(final Collection c) { synchronized(sync) { return collection.removeAll(c); } }
@Override
public boolean retainAll(final Collection c) { synchronized(sync) { return collection.retainAll(c); } }
@Override
public boolean removeIf(final FloatPredicate filter) { synchronized(sync) { return collection.removeIf(filter); } }
@Override
public void clear() { synchronized(sync) { collection.clear(); } }
@Override
public String toString() { synchronized(sync) { return collection.toString(); } }
@Override
public int hashCode() { synchronized(sync) { return collection.hashCode(); } }
@Override
public boolean equals(final Object o) { if (o == this) return true; synchronized(sync) { return collection.equals(o); } }
private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
synchronized(sync) { s.defaultWriteObject(); }
}
}
/** Returns a synchronized collection backed by the specified collection.
*
* @param c the collection to be wrapped in a synchronized collection.
* @return a synchronized view of the specified collection.
* @see java.util.Collections#synchronizedCollection(Collection)
*/
public static FloatCollection synchronize(final FloatCollection c) { return new SynchronizedCollection (c); }
/** Returns a synchronized collection backed by the specified collection, using an assigned object to synchronize.
*
* @param c the collection to be wrapped in a synchronized collection.
* @param sync an object that will be used to synchronize the list access.
* @return a synchronized view of the specified collection.
* @see java.util.Collections#synchronizedCollection(Collection)
*/
public static FloatCollection synchronize(final FloatCollection c, final Object sync) { return new SynchronizedCollection (c, sync); }
/** An unmodifiable wrapper class for collections. */
static class UnmodifiableCollection implements FloatCollection , java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final FloatCollection collection;
protected UnmodifiableCollection(final FloatCollection c) {
this.collection = Objects.requireNonNull(c);
}
@Override
public boolean add(final float k) { throw new UnsupportedOperationException(); }
@Override
public boolean rem(final float k) { throw new UnsupportedOperationException(); }
@Override
public int size() { return collection.size(); }
@Override
public boolean isEmpty() { return collection.isEmpty(); }
@Override
public boolean contains(final float o) { return collection.contains(o); }
@Override
public FloatIterator iterator() { return FloatIterators.unmodifiable(collection.iterator()); }
@Override
public FloatSpliterator spliterator() { return collection.spliterator(); }
@Deprecated
@Override
public java.util.stream.Stream stream() { return collection.stream(); }
@Deprecated
@Override
public java.util.stream.Stream parallelStream() { return collection.parallelStream(); }
@Override
public void clear() { throw new UnsupportedOperationException(); }
@Override
public T[] toArray(final T[] a) { return collection.toArray(a); }
@Override
public Object[] toArray() { return collection.toArray(); }
@Override
public void forEach(final FloatConsumer action) { collection.forEach(action); }
@Override
public boolean containsAll(Collection c) { return collection.containsAll(c); }
@Override
public boolean addAll(Collection c) { throw new UnsupportedOperationException(); }
@Override
public boolean removeAll(Collection c) { throw new UnsupportedOperationException(); }
@Override
public boolean retainAll(Collection c) { throw new UnsupportedOperationException(); }
@Override
public boolean removeIf(final FloatPredicate filter) { throw new UnsupportedOperationException(); }
@Override
@Deprecated
public boolean add(final Float k) { throw new UnsupportedOperationException(); }
@Override
@Deprecated
public boolean contains(final Object k) { return collection.contains(k); }
@Override
@Deprecated
public boolean remove(final Object k) { throw new UnsupportedOperationException(); }
@Override
public float[] toFloatArray() { return collection.toFloatArray(); }
/* {@inheritDoc}
* @deprecated Please use {@code toArray()} instead—this method is redundant.
*/
@Deprecated
@Override
public float[] toFloatArray(final float[] a) { return toArray(a); }
@Override
public float[] toArray(final float[] a) { return collection.toArray(a); }
@Override
public boolean containsAll(FloatCollection c) { return collection.containsAll(c); }
@Override
public boolean addAll(FloatCollection c) { throw new UnsupportedOperationException(); }
@Override
public boolean removeAll(FloatCollection c) { throw new UnsupportedOperationException(); }
@Override
public boolean retainAll(FloatCollection c) { throw new UnsupportedOperationException(); }
@Override
public DoubleIterator doubleIterator() { return collection.doubleIterator(); }
@Override
public DoubleSpliterator doubleSpliterator() { return collection.doubleSpliterator(); }
@Override
public java.util.stream.DoubleStream doubleStream() { return collection.doubleStream(); }
@Override
public java.util.stream.DoubleStream doubleParallelStream() { return collection.doubleParallelStream(); }
@Override
public String toString() { return collection.toString(); }
@Override
public int hashCode() { return collection.hashCode(); }
@Override
public boolean equals(final Object o) { if (o == this) return true; return collection.equals(o); }
}
/** Returns an unmodifiable collection backed by the specified collection.
*
* @param c the collection to be wrapped in an unmodifiable collection.
* @return an unmodifiable view of the specified collection.
* @see java.util.Collections#unmodifiableCollection(Collection)
*/
public static FloatCollection unmodifiable(final FloatCollection c) { return new UnmodifiableCollection (c); }
/** A collection wrapper class for iterables. */
public static class IterableCollection extends AbstractFloatCollection implements java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final FloatIterable iterable;
protected IterableCollection(final FloatIterable iterable) {
this.iterable = Objects.requireNonNull(iterable);
}
@Override
public int size() {
long size = iterable.spliterator().getExactSizeIfKnown();
if (size >= 0) return (int)Math.min(Integer.MAX_VALUE, size);
int c = 0;
final FloatIterator iterator = iterator();
while(iterator.hasNext()) {
iterator.nextFloat();
c++;
}
return c;
}
@Override
public boolean isEmpty() { return ! iterable.iterator().hasNext(); }
@Override
public FloatIterator iterator() { return iterable.iterator(); }
@Override
public FloatSpliterator spliterator() { return iterable.spliterator(); }
@Override
public DoubleIterator doubleIterator() { return iterable.doubleIterator() ; }
@Override
public DoubleSpliterator doubleSpliterator() { return iterable.doubleSpliterator() ; }
}
/** Returns an unmodifiable collection backed by the specified iterable.
*
* @param iterable the iterable object to be wrapped in an unmodifiable collection.
* @return an unmodifiable collection view of the specified iterable.
*/
public static FloatCollection asCollection(final FloatIterable iterable) {
if (iterable instanceof FloatCollection) return (FloatCollection )iterable;
// TODO test for Collection but not our collection, and make a wrapper for it.
return new IterableCollection (iterable);
}
}