| /* |
| * 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.solr.analytics.function.field; |
| |
| import java.io.IOException; |
| import java.util.function.Consumer; |
| |
| import org.apache.lucene.index.BinaryDocValues; |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.solr.analytics.facet.compare.ExpressionComparator; |
| import org.apache.solr.analytics.value.StringValue.CastingStringValue; |
| import org.apache.solr.schema.StrField; |
| |
| /** |
| * An analytics wrapper for a single-valued {@link StrField} with DocValues enabled. |
| */ |
| public class StringField extends AnalyticsField implements CastingStringValue { |
| private BinaryDocValues docValues; |
| String value; |
| boolean exists; |
| |
| public StringField(String fieldName) { |
| super(fieldName); |
| exists = false; |
| } |
| |
| @Override |
| public void doSetNextReader(LeafReaderContext context) throws IOException { |
| docValues = DocValues.getBinary(context.reader(), fieldName); |
| } |
| |
| @Override |
| public void collect(int doc) throws IOException { |
| exists = docValues.advanceExact(doc); |
| if (exists) { |
| value = docValues.binaryValue().utf8ToString(); |
| } |
| } |
| |
| @Override |
| public String getString() { |
| return exists ? value : null; |
| } |
| @Override |
| public Object getObject() { |
| return exists ? value : null; |
| } |
| @Override |
| public boolean exists() { |
| return exists; |
| } |
| |
| @Override |
| public void streamStrings(Consumer<String> cons) { |
| if (exists) { |
| cons.accept(value); |
| } |
| } |
| @Override |
| public void streamObjects(Consumer<Object> cons) { |
| if (exists) { |
| cons.accept(value); |
| } |
| } |
| |
| @Override |
| public ExpressionComparator<String> getObjectComparator(String expression) { |
| return new ExpressionComparator<>(expression); |
| } |
| } |