org.codelibs.elasticsearch.taste.model.PlusAnonymousUserLongPrimitiveIterator Maven / Gradle / Ivy

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.codelibs.elasticsearch.taste.model;

import org.codelibs.elasticsearch.taste.common.AbstractLongPrimitiveIterator;
import org.codelibs.elasticsearch.taste.common.LongPrimitiveIterator;

final class PlusAnonymousUserLongPrimitiveIterator extends
        AbstractLongPrimitiveIterator {

    private final LongPrimitiveIterator delegate;

    private final long extraDatum;

    private boolean datumConsumed;

    PlusAnonymousUserLongPrimitiveIterator(
            final LongPrimitiveIterator delegate, final long extraDatum) {
        this.delegate = delegate;
        this.extraDatum = extraDatum;
        datumConsumed = false;
    }

    @Override
    public long nextLong() {
        if (datumConsumed) {
            return delegate.nextLong();
        } else {
            if (delegate.hasNext()) {
                final long delegateNext = delegate.peek();
                if (extraDatum <= delegateNext) {
                    datumConsumed = true;
                    return extraDatum;
                } else {
                    return delegate.next();
                }
            } else {
                datumConsumed = true;
                return extraDatum;
            }
        }
    }

    @Override
    public long peek() {
        if (datumConsumed) {
            return delegate.peek();
        } else {
            if (delegate.hasNext()) {
                final long delegateNext = delegate.peek();
                if (extraDatum <= delegateNext) {
                    return extraDatum;
                } else {
                    return delegateNext;
                }
            } else {
                return extraDatum;
            }
        }
    }

    @Override
    public boolean hasNext() {
        return !datumConsumed || delegate.hasNext();
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }

    @Override
    public void skip(final int n) {
        for (int i = 0; i < n; i++) {
            nextLong();
        }
    }

}