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ixjava developed by David Karnok

There is a newer version: 1.0.0

/*
 * Copyright 2011-2016 David Karnok
 *
 * 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 ix;

import java.util.Iterator;

final class IxForloop extends Ix {

    final T seed;

    final IxPredicate condition;

    final IxFunction selector;

    final IxFunction next;

    IxForloop(T seed, IxPredicate condition, IxFunction selector,
            IxFunction next) {
        this.seed = seed;
        this.condition = condition;
        this.selector = selector;
        this.next = next;
    }

    @Override
    public Iterator iterator() {
        return new ForloopIterator(seed, condition, selector, next);
    }

    static final class ForloopIterator extends IxBaseIterator {

        T index;

        final IxPredicate condition;

        final IxFunction selector;

        final IxFunction next;

        boolean exceptFirst;

        ForloopIterator(T index, IxPredicate condition, IxFunction selector,
                IxFunction next) {
            this.index = index;
            this.condition = condition;
            this.selector = selector;
            this.next = next;
        }

        @Override
        protected boolean moveNext() {
            T i = index;

            if (exceptFirst) {
                i = next.apply(i);
                index = i;
            } else {
                exceptFirst = true;
            }

            if (!condition.test(i)) {
                done = true;
                return false;
            }

            value = selector.apply(i);
            hasValue = true;

            return true;
        }
    }
}