| /* |
| * 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.search.function; |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| |
| /** |
| * <code>ConcatStringFunction</code> concatenates the string values of its |
| * components in the order given. |
| */ |
| public class ConcatStringFunction extends MultiStringFunction { |
| public final static String NAME = "concat"; |
| |
| public ConcatStringFunction(ValueSource[] sources) { |
| super(sources); |
| } |
| |
| protected String name() { |
| return NAME; |
| } |
| |
| @Override |
| protected String func(int doc, FunctionValues[] valsArr) throws IOException { |
| StringBuilder sb = new StringBuilder(); |
| for (FunctionValues val : valsArr) { |
| String v = val.strVal(doc); |
| if(v == null){ |
| return null; |
| } else { |
| sb.append(v); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| } |