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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 IxGenerateStateless extends Ix {

    final IxConsumer> generator;

    IxGenerateStateless(IxConsumer> generator) {
        this.generator = generator;
    }

    @Override
    public Iterator iterator() {
        return new GenerateIterator(generator);
    }

    static final class GenerateIterator extends IxBaseIterator
    implements IxEmitter {

        final IxConsumer> generator;

        GenerateIterator(IxConsumer> generator) {
            this.generator = generator;
        }

        @Override
        protected boolean moveNext() {

            generator.accept(this);

            boolean hv = hasValue;
            if (!hv && !done) {
                throw new IllegalStateException("The generator didn't call any of the onXXX methods!");
            }
            return hv;
        }

        @Override
        public void onNext(T t) {
            value = t;
            hasValue = true;
        }

        @Override
        public void onComplete() {
            done = true;
        }
    }
}