| /* |
| * 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.codecs; |
| |
| import java.util.Iterator; |
| |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * a utility class to write missing values for SORTED as if they were the empty string |
| * (to simulate pre-Lucene4.5 dv behavior for testing old codecs) |
| */ |
| public class MissingOrdRemapper { |
| |
| /** insert an empty byte[] to the front of this iterable */ |
| public static Iterable<BytesRef> insertEmptyValue(final Iterable<BytesRef> iterable) { |
| return new Iterable<BytesRef>() { |
| @Override |
| public Iterator<BytesRef> iterator() { |
| return new Iterator<BytesRef>() { |
| boolean seenEmpty = false; |
| Iterator<BytesRef> in = iterable.iterator(); |
| |
| @Override |
| public boolean hasNext() { |
| return !seenEmpty || in.hasNext(); |
| } |
| |
| @Override |
| public BytesRef next() { |
| if (!seenEmpty) { |
| seenEmpty = true; |
| return new BytesRef(); |
| } else { |
| return in.next(); |
| } |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| }; |
| } |
| |
| /** remaps ord -1 to ord 0 on this iterable. */ |
| public static Iterable<Number> mapMissingToOrd0(final Iterable<Number> iterable) { |
| return new Iterable<Number>() { |
| @Override |
| public Iterator<Number> iterator() { |
| return new Iterator<Number>() { |
| Iterator<Number> in = iterable.iterator(); |
| |
| @Override |
| public boolean hasNext() { |
| return in.hasNext(); |
| } |
| |
| @Override |
| public Number next() { |
| Number n = in.next(); |
| if (n.longValue() == -1) { |
| return 0; |
| } else { |
| return n; |
| } |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| }; |
| } |
| |
| /** remaps every ord+1 on this iterable */ |
| public static Iterable<Number> mapAllOrds(final Iterable<Number> iterable) { |
| return new Iterable<Number>() { |
| @Override |
| public Iterator<Number> iterator() { |
| return new Iterator<Number>() { |
| Iterator<Number> in = iterable.iterator(); |
| |
| @Override |
| public boolean hasNext() { |
| return in.hasNext(); |
| } |
| |
| @Override |
| public Number next() { |
| Number n = in.next(); |
| return n.longValue()+1; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| }; |
| } |
| } |