| package org.apache.lucene.index; |
| |
| /* |
| * 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. |
| */ |
| |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * Exposes multi-valued view over a single-valued instance. |
| * <p> |
| * This can be used if you want to have one multi-valued implementation |
| * against e.g. FieldCache.getDocTermOrds that also works for single-valued |
| * fields. |
| */ |
| final class SingletonSortedSetDocValues extends SortedSetDocValues { |
| private final SortedDocValues in; |
| private int docID; |
| private boolean set; |
| |
| /** Creates a multi-valued view over the provided SortedDocValues */ |
| public SingletonSortedSetDocValues(SortedDocValues in) { |
| this.in = in; |
| assert NO_MORE_ORDS == -1; // this allows our nextOrd() to work for missing values without a check |
| } |
| |
| /** Return the wrapped {@link SortedDocValues} */ |
| public SortedDocValues getSortedDocValues() { |
| return in; |
| } |
| |
| @Override |
| public long nextOrd() { |
| if (set) { |
| return NO_MORE_ORDS; |
| } else { |
| set = true; |
| return in.getOrd(docID); |
| } |
| } |
| |
| @Override |
| public void setDocument(int docID) { |
| this.docID = docID; |
| set = false; |
| } |
| |
| @Override |
| public void lookupOrd(long ord, BytesRef result) { |
| // cast is ok: single-valued cannot exceed Integer.MAX_VALUE |
| in.lookupOrd((int)ord, result); |
| } |
| |
| @Override |
| public long getValueCount() { |
| return in.getValueCount(); |
| } |
| |
| @Override |
| public long lookupTerm(BytesRef key) { |
| return in.lookupTerm(key); |
| } |
| } |