com.github.tommyettinger.ds.support.util.LimitingFloatIterator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jdkgdxds Show documentation

Making libGDX's data structures implement JDK interfaces.

The newest version!

/*
 * Copyright (c) 2025 See AUTHORS file.
 *
 * 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.github.tommyettinger.ds.support.util;

/**
 * Wraps an Iterator so that it only returns at most a specific amount of items (defined by calls to
 * {@link #nextFloat()}. This can be useful to limit infinite Iterators so they only produce a finite amount of results.
 * This has undefined behavior if any items the Iterator could return are modified during iteration.
 * 

 * You can change the Iterator and limit at once using {@link #set(FloatIterator, int)}, and can also just
 * change the Iterator with {@link #set(FloatIterator)}.
 */
public class LimitingFloatIterator implements FloatIterator {
    public FloatIterator iterator;
    protected int limit = 1;
    protected int remaining = 1;

    public LimitingFloatIterator() {
    }

    public LimitingFloatIterator(final FloatIterator iterator, int limit) {
        set(iterator, limit);
    }

    public void set (final FloatIterator iterator, int limit) {
        this.iterator = iterator;
        this.remaining = this.limit = Math.max(0, limit);
    }

    public void set (final FloatIterator iterator) {
        set(iterator, limit);
    }

    @Override
    public boolean hasNext () {
        return (iterator.hasNext() && remaining > 0);
    }

    @Override
    public float nextFloat () {
        remaining--;
        return iterator.next();
    }

    @Override
    public void remove () {
        iterator.remove();
    }
}