| /* |
| * 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.mapping; |
| |
| import org.apache.solr.analytics.ExpressionFactory.CreatorFunction; |
| import org.apache.solr.analytics.value.AnalyticsValueStream; |
| import org.apache.solr.analytics.value.StringValue; |
| import org.apache.solr.analytics.value.StringValueStream; |
| import org.apache.solr.common.SolrException; |
| import org.apache.solr.common.SolrException.ErrorCode; |
| |
| /** |
| * A mapping function that casts any input to a {@link StringValue} or {@link StringValueStream}. |
| */ |
| public class StringCastFunction { |
| public static final String name = "string"; |
| public static final CreatorFunction creatorFunction = (params -> { |
| if (params.length != 1) { |
| throw new SolrException(ErrorCode.BAD_REQUEST,"The "+name+" function requires 1 paramater, " + params.length + " found."); |
| } |
| AnalyticsValueStream param = params[0]; |
| if (param instanceof StringValueStream) { |
| return LambdaFunction.createStringLambdaFunction(name, a -> a, (StringValueStream)param); |
| } else { |
| throw new SolrException(ErrorCode.BAD_REQUEST,"The "+name+" function requires a string-castable parameter."); |
| } |
| }); |
| } |