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package org.apache.lucene.search;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import java.io.IOException;
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* Abstract decorator class of a DocIdSetIterator
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* implementation that provides on-demand filter/validation
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* mechanism on an underlying DocIdSetIterator. See {@link
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public abstract class FilteredDocIdSetIterator extends DocIdSetIterator {
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protected DocIdSetIterator _innerIter;
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* @param innerIter Underlying DocIdSetIterator.
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public FilteredDocIdSetIterator(DocIdSetIterator innerIter) {
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if (innerIter == null) {
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throw new IllegalArgumentException("null iterator");
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_innerIter = innerIter;
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* Validation method to determine whether a docid should be in the result set.
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* @param doc docid to be tested
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* @return true if input docid should be in the result set, false otherwise.
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* @see #FilteredDocIdSetIterator(DocIdSetIterator)
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abstract protected boolean match(int doc) throws IOException;
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public int nextDoc() throws IOException {
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while ((doc = _innerIter.nextDoc()) != NO_MORE_DOCS) {
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public int advance(int target) throws IOException {
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doc = _innerIter.advance(target);
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if (doc != NO_MORE_DOCS) {
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while ((doc = _innerIter.nextDoc()) != NO_MORE_DOCS) {