| package org.apache.lucene.expressions; |
| /* |
| * 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 org.apache.lucene.queries.function.ValueSource; |
| |
| /** |
| * Binds variable names in expressions to actual data. |
| * <p> |
| * These are typically DocValues fields/FieldCache, the document's |
| * relevance score, or other ValueSources. |
| * |
| * @lucene.experimental |
| */ |
| public abstract class Bindings { |
| |
| /** Sole constructor. (For invocation by subclass |
| * constructors, typically implicit.) */ |
| protected Bindings() {} |
| |
| /** |
| * Returns a ValueSource bound to the variable name. |
| */ |
| public abstract ValueSource getValueSource(String name); |
| |
| /** Returns a {@code ValueSource} over relevance scores */ |
| protected final ValueSource getScoreValueSource() { |
| return new ScoreValueSource(); |
| } |
| } |
