| /* |
| * 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; |
| import org.apache.lucene.util.BytesRefBuilder; |
| |
| /** Implements a {@link TermsEnum} wrapping a provided {@link SortedDocValues}. */ |
| class SortedDocValuesTermsEnum extends BaseTermsEnum { |
| private final SortedDocValues values; |
| private int currentOrd = -1; |
| private final BytesRefBuilder scratch; |
| |
| /** Creates a new TermsEnum over the provided values */ |
| public SortedDocValuesTermsEnum(SortedDocValues values) { |
| this.values = values; |
| scratch = new BytesRefBuilder(); |
| } |
| |
| @Override |
| public SeekStatus seekCeil(BytesRef text) throws IOException { |
| int ord = values.lookupTerm(text); |
| if (ord >= 0) { |
| currentOrd = ord; |
| scratch.copyBytes(text); |
| return SeekStatus.FOUND; |
| } else { |
| currentOrd = -ord - 1; |
| if (currentOrd == values.getValueCount()) { |
| return SeekStatus.END; |
| } else { |
| // TODO: hmm can we avoid this "extra" lookup?: |
| scratch.copyBytes(values.lookupOrd(currentOrd)); |
| return SeekStatus.NOT_FOUND; |
| } |
| } |
| } |
| |
| @Override |
| public boolean seekExact(BytesRef text) throws IOException { |
| int ord = values.lookupTerm(text); |
| if (ord >= 0) { |
| currentOrd = ord; |
| scratch.copyBytes(text); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public void seekExact(long ord) throws IOException { |
| assert ord >= 0 && ord < values.getValueCount(); |
| currentOrd = (int) ord; |
| scratch.copyBytes(values.lookupOrd(currentOrd)); |
| } |
| |
| @Override |
| public BytesRef next() throws IOException { |
| currentOrd++; |
| if (currentOrd >= values.getValueCount()) { |
| return null; |
| } |
| scratch.copyBytes(values.lookupOrd(currentOrd)); |
| return scratch.get(); |
| } |
| |
| @Override |
| public BytesRef term() throws IOException { |
| return scratch.get(); |
| } |
| |
| @Override |
| public long ord() throws IOException { |
| return currentOrd; |
| } |
| |
| @Override |
| public int docFreq() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long totalTermFreq() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public PostingsEnum postings(PostingsEnum reuse, int flags) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public ImpactsEnum impacts(int flags) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void seekExact(BytesRef term, TermState state) throws IOException { |
| assert state != null && state instanceof OrdTermState; |
| this.seekExact(((OrdTermState) state).ord); |
| } |
| |
| @Override |
| public TermState termState() throws IOException { |
| OrdTermState state = new OrdTermState(); |
| state.ord = currentOrd; |
| return state; |
| } |
| } |