| /* |
| * 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.index; |
| |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * Exposes multi-valued iterator view over a single-valued iterator. |
| * <p> |
| * This can be used if you want to have one multi-valued implementation |
| * that works for single or multi-valued types. |
| */ |
| final class SingletonSortedSetDocValues extends SortedSetDocValues { |
| private final SortedDocValues in; |
| private long ord; |
| |
| /** Creates a multi-valued view over the provided SortedDocValues */ |
| public SingletonSortedSetDocValues(SortedDocValues in) { |
| if (in.docID() != -1) { |
| throw new IllegalStateException("iterator has already been used: docID=" + in.docID()); |
| } |
| this.in = in; |
| } |
| |
| /** Return the wrapped {@link SortedDocValues} */ |
| public SortedDocValues getSortedDocValues() { |
| if (in.docID() != -1) { |
| throw new IllegalStateException("iterator has already been used: docID=" + in.docID()); |
| } |
| return in; |
| } |
| |
| @Override |
| public int docID() { |
| return in.docID(); |
| } |
| |
| @Override |
| public long nextOrd() { |
| long v = ord; |
| ord = NO_MORE_ORDS; |
| return v; |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| int docID = in.nextDoc(); |
| if (docID != NO_MORE_DOCS) { |
| ord = in.ordValue(); |
| } |
| return docID; |
| } |
| |
| @Override |
| public int advance(int target) throws IOException { |
| int docID = in.advance(target); |
| if (docID != NO_MORE_DOCS) { |
| ord = in.ordValue(); |
| } |
| return docID; |
| } |
| |
| @Override |
| public boolean advanceExact(int target) throws IOException { |
| if (in.advanceExact(target)) { |
| ord = in.ordValue(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public BytesRef lookupOrd(long ord) throws IOException { |
| // cast is ok: single-valued cannot exceed Integer.MAX_VALUE |
| return in.lookupOrd((int) ord); |
| } |
| |
| @Override |
| public long getValueCount() { |
| return in.getValueCount(); |
| } |
| |
| @Override |
| public long lookupTerm(BytesRef key) throws IOException { |
| return in.lookupTerm(key); |
| } |
| |
| @Override |
| public TermsEnum termsEnum() throws IOException { |
| return in.termsEnum(); |
| } |
| |
| @Override |
| public long cost() { |
| return in.cost(); |
| } |
| } |