| package org.apache.lucene.sandbox.queries; |
| |
| /* |
| * 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 java.io.IOException; |
| import java.text.Collator; |
| |
| import org.apache.lucene.index.AtomicReaderContext; |
| import org.apache.lucene.index.BinaryDocValues; |
| import org.apache.lucene.search.FieldCache; |
| import org.apache.lucene.search.FieldComparator; |
| import org.apache.lucene.util.Bits; |
| import org.apache.lucene.util.BytesRef; |
| |
| /** Sorts by a field's value using the given Collator |
| * |
| * <p><b>WARNING</b>: this is very slow; you'll |
| * get much better performance using the |
| * CollationKeyAnalyzer or ICUCollationKeyAnalyzer. |
| * @deprecated Index collation keys with CollationKeyAnalyzer or ICUCollationKeyAnalyzer instead. |
| * This class will be removed in Lucene 5.0 |
| */ |
| @Deprecated |
| public final class SlowCollatedStringComparator extends FieldComparator<String> { |
| |
| private final String[] values; |
| private BinaryDocValues currentDocTerms; |
| private Bits docsWithField; |
| private final String field; |
| final Collator collator; |
| private String bottom; |
| private String topValue; |
| private final BytesRef tempBR = new BytesRef(); |
| |
| public SlowCollatedStringComparator(int numHits, String field, Collator collator) { |
| values = new String[numHits]; |
| this.field = field; |
| this.collator = collator; |
| } |
| |
| @Override |
| public int compare(int slot1, int slot2) { |
| final String val1 = values[slot1]; |
| final String val2 = values[slot2]; |
| if (val1 == null) { |
| if (val2 == null) { |
| return 0; |
| } |
| return -1; |
| } else if (val2 == null) { |
| return 1; |
| } |
| return collator.compare(val1, val2); |
| } |
| |
| @Override |
| public int compareBottom(int doc) { |
| currentDocTerms.get(doc, tempBR); |
| final String val2 = tempBR.length == 0 && docsWithField.get(doc) == false ? null : tempBR.utf8ToString(); |
| if (bottom == null) { |
| if (val2 == null) { |
| return 0; |
| } |
| return -1; |
| } else if (val2 == null) { |
| return 1; |
| } |
| return collator.compare(bottom, val2); |
| } |
| |
| @Override |
| public void copy(int slot, int doc) { |
| currentDocTerms.get(doc, tempBR); |
| if (tempBR.length == 0 && docsWithField.get(doc) == false) { |
| values[slot] = null; |
| } else { |
| values[slot] = tempBR.utf8ToString(); |
| } |
| } |
| |
| @Override |
| public FieldComparator<String> setNextReader(AtomicReaderContext context) throws IOException { |
| currentDocTerms = FieldCache.DEFAULT.getTerms(context.reader(), field, true); |
| docsWithField = FieldCache.DEFAULT.getDocsWithField(context.reader(), field); |
| return this; |
| } |
| |
| @Override |
| public void setBottom(final int bottom) { |
| this.bottom = values[bottom]; |
| } |
| |
| @Override |
| public void setTopValue(final String value) { |
| this.topValue = value; |
| } |
| |
| @Override |
| public String value(int slot) { |
| return values[slot]; |
| } |
| |
| @Override |
| public int compareValues(String first, String second) { |
| if (first == null) { |
| if (second == null) { |
| return 0; |
| } |
| return -1; |
| } else if (second == null) { |
| return 1; |
| } else { |
| return collator.compare(first, second); |
| } |
| } |
| |
| @Override |
| public int compareTop(int doc) { |
| currentDocTerms.get(doc, tempBR); |
| final String docValue; |
| if (tempBR.length == 0 && docsWithField.get(doc) == false) { |
| docValue = null; |
| } else { |
| docValue = tempBR.utf8ToString(); |
| } |
| return compareValues(topValue, docValue); |
| } |
| } |