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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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