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IterableOf.java
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IterableOf.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2017-2018 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.cactoos.iterable;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.cactoos.Func;
import org.cactoos.Scalar;
import org.cactoos.func.UncheckedFunc;
import org.cactoos.iterator.IteratorOf;
import org.cactoos.scalar.StickyScalar;
import org.cactoos.scalar.UncheckedScalar;
/**
* Array as iterable.
*
* <p>There is no thread-safety guarantee.
*
* @param <X> Type of item
* @since 0.12
*/
public final class IterableOf<X> extends IterableEnvelope<X> {
/**
* Ctor.
* @param items The array
*/
@SafeVarargs
public IterableOf(final X... items) {
this(() -> new IteratorOf<>(items));
}
/**
* Ctor.
* @param list The list
*/
public IterableOf(final List<X> list) {
this(list::iterator);
}
/**
* Ctor.
* @param list The list
* @since 0.21
*/
public IterableOf(final Iterator<X> list) {
this(() -> list);
}
/**
* Useful for pagination.
* @param <I> Custom iterator
* @param first First bag of elements
* @param next Subsequent bags of elements
*/
@SuppressWarnings(
{
"PMD.CallSuperInConstructor",
"PMD.ConstructorOnlyInitializesOrCallOtherConstructors"
}
)
public <I extends Iterator<X>> IterableOf(
final Scalar<I> first, final Func<I, I> next
) {
// @checkstyle AnonInnerLengthCheck (30 lines)
this(() -> new Iterator<X>() {
private UncheckedScalar<I> current = new UncheckedScalar<>(
new StickyScalar<>(first)
);
private final UncheckedFunc<I, I> subsequent =
new UncheckedFunc<>(next);
@Override
public boolean hasNext() {
if (!this.current.value().hasNext()) {
final I next = this.subsequent.apply(
this.current.value()
);
this.current = new UncheckedScalar<>(
new StickyScalar<>(() -> next)
);
}
return this.current.value().hasNext();
}
@Override
public X next() {
if (this.hasNext()) {
return this.current.value().next();
}
throw new NoSuchElementException();
}
});
}
/**
* Ctor.
* @param sclr The encapsulated iterator of x
*/
private IterableOf(final Scalar<Iterator<X>> sclr) {
super(() -> () -> new UncheckedScalar<>(sclr).value());
}
}