| /* |
| * 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.queries.function.valuesource; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.SortedDocValues; |
| import org.apache.lucene.index.SortedSetDocValues; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.docvalues.DocTermsIndexDocValues; |
| import org.apache.lucene.search.SortField; |
| import org.apache.lucene.search.SortedSetSelector; |
| import org.apache.lucene.search.SortedSetSortField; |
| |
| /** |
| * Retrieves {@link FunctionValues} instances for multi-valued string based fields. |
| * <p> |
| * A SortedSetDocValues contains multiple values for a field, so this |
| * technique "selects" a value as the representative value for the document. |
| * |
| * @see SortedSetSelector |
| */ |
| public class SortedSetFieldSource extends FieldCacheSource { |
| protected final SortedSetSelector.Type selector; |
| |
| public SortedSetFieldSource(String field) { |
| this(field, SortedSetSelector.Type.MIN); |
| } |
| |
| public SortedSetFieldSource(String field, SortedSetSelector.Type selector) { |
| super(field); |
| this.selector = selector; |
| } |
| |
| @Override |
| public SortField getSortField(boolean reverse) { |
| return new SortedSetSortField(this.field, reverse, this.selector); |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| SortedSetDocValues sortedSet = DocValues.getSortedSet(readerContext.reader(), field); |
| SortedDocValues view = SortedSetSelector.wrap(sortedSet, selector); |
| return new DocTermsIndexDocValues(this, view) { |
| @Override |
| protected String toTerm(String readableValue) { |
| return readableValue; |
| } |
| |
| @Override |
| public Object objectVal(int doc) throws IOException { |
| return strVal(doc); |
| } |
| }; |
| } |
| |
| @Override |
| public String description() { |
| return "sortedset(" + field + ",selector=" + selector + ')'; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = super.hashCode(); |
| result = prime * result + ((selector == null) ? 0 : selector.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) return true; |
| if (!super.equals(obj)) return false; |
| if (getClass() != obj.getClass()) return false; |
| SortedSetFieldSource other = (SortedSetFieldSource) obj; |
| if (selector != other.selector) return false; |
| return true; |
| } |
| } |