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Reduce memory usage of field maps in FieldInfos and BlockTree TermsRe…
…ader. (#13327)
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lucene/core/src/java/org/apache/lucene/util/hppc/AbstractIterator.java
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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. | ||
| */ | ||
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| package org.apache.lucene.util.hppc; | ||
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| import java.util.Iterator; | ||
| import java.util.NoSuchElementException; | ||
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| /** | ||
| * Simplifies the implementation of iterators a bit. Modeled loosely after Google Guava's API. | ||
| * | ||
| * <p>Forked from com.carrotsearch.hppc.AbstractIterator | ||
| */ | ||
| public abstract class AbstractIterator<E> implements Iterator<E> { | ||
| private static final int NOT_CACHED = 0; | ||
| private static final int CACHED = 1; | ||
| private static final int AT_END = 2; | ||
|
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| /** Current iterator state. */ | ||
| private int state = NOT_CACHED; | ||
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| /** The next element to be returned from {@link #next()} if fetched. */ | ||
| private E nextElement; | ||
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| @Override | ||
| public boolean hasNext() { | ||
| if (state == NOT_CACHED) { | ||
| state = CACHED; | ||
| nextElement = fetch(); | ||
| } | ||
| return state == CACHED; | ||
| } | ||
|
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| @Override | ||
| public E next() { | ||
| if (!hasNext()) { | ||
| throw new NoSuchElementException(); | ||
| } | ||
|
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| state = NOT_CACHED; | ||
| return nextElement; | ||
| } | ||
|
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| /** Default implementation throws {@link UnsupportedOperationException}. */ | ||
| @Override | ||
| public void remove() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| /** | ||
| * Fetch next element. The implementation must return {@link #done()} when all elements have been | ||
| * fetched. | ||
| * | ||
| * @return Returns the next value for the iterator or chain-calls {@link #done()}. | ||
| */ | ||
| protected abstract E fetch(); | ||
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| /** | ||
| * Call when done. | ||
| * | ||
| * @return Returns a unique sentinel value to indicate end-of-iteration. | ||
| */ | ||
| protected final E done() { | ||
| state = AT_END; | ||
| return null; | ||
| } | ||
| } |
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