| /* |
| * 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.search; |
| |
| import java.io.IOException; |
| |
| class AssertingMatchesIterator implements MatchesIterator { |
| |
| private final MatchesIterator in; |
| private State state = State.UNPOSITIONED; |
| |
| private enum State { UNPOSITIONED, ITERATING, EXHAUSTED } |
| |
| AssertingMatchesIterator(MatchesIterator in) { |
| this.in = in; |
| } |
| |
| @Override |
| public boolean next() throws IOException { |
| assert state != State.EXHAUSTED : state; |
| boolean more = in.next(); |
| if (more == false) { |
| state = State.EXHAUSTED; |
| } |
| else { |
| state = State.ITERATING; |
| } |
| return more; |
| } |
| |
| @Override |
| public int startPosition() { |
| assert state == State.ITERATING : state; |
| return in.startPosition(); |
| } |
| |
| @Override |
| public int endPosition() { |
| assert state == State.ITERATING : state; |
| return in.endPosition(); |
| } |
| |
| @Override |
| public int startOffset() throws IOException { |
| assert state == State.ITERATING : state; |
| return in.startOffset(); |
| } |
| |
| @Override |
| public int endOffset() throws IOException { |
| assert state == State.ITERATING : state; |
| return in.endOffset(); |
| } |
| |
| @Override |
| public MatchesIterator getSubMatches() throws IOException { |
| assert state == State.ITERATING : state; |
| return in.getSubMatches(); |
| } |
| |
| @Override |
| public Query getQuery() { |
| assert state == State.ITERATING : state; |
| return in.getQuery(); |
| } |
| } |