| /* |
| * 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.apache.lucene.queries.intervals; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.search.MatchesIterator; |
| import org.apache.lucene.search.Query; |
| |
| final class IntervalMatches { |
| |
| static IntervalMatchesIterator asMatches(IntervalIterator iterator, IntervalMatchesIterator source, int doc) throws IOException { |
| if (source == null) { |
| return null; |
| } |
| if (iterator.advance(doc) != doc) { |
| return null; |
| } |
| if (iterator.nextInterval() == IntervalIterator.NO_MORE_INTERVALS) { |
| return null; |
| } |
| return new IntervalMatchesIterator() { |
| |
| boolean cached = true; |
| |
| @Override |
| public boolean next() throws IOException { |
| if (cached) { |
| cached = false; |
| return true; |
| } |
| return iterator.nextInterval() != IntervalIterator.NO_MORE_INTERVALS; |
| } |
| |
| @Override |
| public int startPosition() { |
| return iterator.start(); |
| } |
| |
| @Override |
| public int endPosition() { |
| return iterator.end(); |
| } |
| |
| @Override |
| public int startOffset() throws IOException { |
| return source.startOffset(); |
| } |
| |
| @Override |
| public int endOffset() throws IOException { |
| return source.endOffset(); |
| } |
| |
| @Override |
| public int gaps() { |
| return iterator.gaps(); |
| } |
| |
| @Override |
| public int width() { |
| return iterator.width(); |
| } |
| |
| @Override |
| public MatchesIterator getSubMatches() throws IOException { |
| return source.getSubMatches(); |
| } |
| |
| @Override |
| public Query getQuery() { |
| return source.getQuery(); |
| } |
| }; |
| } |
| |
| enum State { UNPOSITIONED, ITERATING, NO_MORE_INTERVALS, EXHAUSTED } |
| |
| static IntervalIterator wrapMatches(IntervalMatchesIterator mi, int doc) { |
| return new IntervalIterator() { |
| |
| State state = State.UNPOSITIONED; |
| |
| @Override |
| public int start() { |
| if (state == State.NO_MORE_INTERVALS) { |
| return NO_MORE_INTERVALS; |
| } |
| assert state == State.ITERATING; |
| return mi.startPosition(); |
| } |
| |
| @Override |
| public int end() { |
| if (state == State.NO_MORE_INTERVALS) { |
| return NO_MORE_INTERVALS; |
| } |
| assert state == State.ITERATING; |
| return mi.endPosition(); |
| } |
| |
| @Override |
| public int gaps() { |
| assert state == State.ITERATING; |
| return mi.gaps(); |
| } |
| |
| @Override |
| public int width() { |
| assert state == State.ITERATING; |
| return mi.width(); |
| } |
| |
| @Override |
| public int nextInterval() throws IOException { |
| assert state == State.ITERATING; |
| if (mi.next()) { |
| return mi.startPosition(); |
| } |
| state = State.NO_MORE_INTERVALS; |
| return NO_MORE_INTERVALS; |
| } |
| |
| @Override |
| public float matchCost() { |
| return 1; |
| } |
| |
| @Override |
| public int docID() { |
| switch (state) { |
| case UNPOSITIONED: |
| return -1; |
| case ITERATING: |
| case NO_MORE_INTERVALS: |
| return doc; |
| case EXHAUSTED: |
| } |
| return NO_MORE_DOCS; |
| } |
| |
| @Override |
| public int nextDoc() { |
| switch (state) { |
| case UNPOSITIONED: |
| state = State.ITERATING; |
| return doc; |
| case ITERATING: |
| case NO_MORE_INTERVALS: |
| state = State.EXHAUSTED; |
| case EXHAUSTED: |
| } |
| return NO_MORE_DOCS; |
| } |
| |
| @Override |
| public int advance(int target) { |
| if (target == doc) { |
| state = State.ITERATING; |
| return doc; |
| } |
| state = State.EXHAUSTED; |
| return NO_MORE_DOCS; |
| } |
| |
| @Override |
| public long cost() { |
| return 1; |
| } |
| }; |
| } |
| } |