| /* |
| * 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.client.solrj.io.ops; |
| |
| import java.io.IOException; |
| import java.util.Locale; |
| import java.util.UUID; |
| |
| import org.apache.solr.client.solrj.io.Tuple; |
| import org.apache.solr.client.solrj.io.stream.expr.Explanation; |
| import org.apache.solr.client.solrj.io.stream.expr.Explanation.ExpressionType; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionNamedParameter; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionParameter; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionValue; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| /** |
| * Concatenates fields and adds them to the tuple. Example |
| * concat(fields="month,day,year", delim="-", as="id") |
| */ |
| public class ConcatOperation implements StreamOperation { |
| |
| private static final long serialVersionUID = 1; |
| private UUID operationNodeId = UUID.randomUUID(); |
| |
| private String[] fields; |
| private String as; |
| private String delim; |
| |
| public ConcatOperation(String[] fields, String as, String delim) { |
| this.fields = fields; |
| this.as = as; |
| this.delim = delim; |
| } |
| |
| public ConcatOperation(StreamExpression expression, StreamFactory factory) throws IOException { |
| |
| if(3 == expression.getParameters().size()){ |
| StreamExpressionNamedParameter fieldsParam = factory.getNamedOperand(expression, "fields"); |
| String fieldsStr = ((StreamExpressionValue)fieldsParam.getParameter()).getValue(); |
| this.fields = fieldsStr.split(","); |
| for(int i=0; i<fields.length; i++) { |
| fields[i] = fields[i].trim(); |
| } |
| |
| StreamExpressionNamedParameter asParam = factory.getNamedOperand(expression, "as"); |
| this.as = ((StreamExpressionValue)asParam.getParameter()).getValue(); |
| |
| StreamExpressionNamedParameter delim = factory.getNamedOperand(expression, "delim"); |
| this.delim = ((StreamExpressionValue)delim.getParameter()).getValue(); |
| } else{ |
| throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - unknown operands found", expression)); |
| } |
| } |
| |
| @Override |
| public void operate(Tuple tuple) { |
| StringBuilder buf = new StringBuilder(); |
| for(String field : fields) { |
| if(buf.length() > 0) { |
| buf.append(delim); |
| } |
| Object value = tuple.get(field); |
| if(null == value){ value = "null"; } |
| buf.append(value); |
| } |
| |
| tuple.put(as, buf.toString()); |
| } |
| |
| @Override |
| public StreamExpressionParameter toExpression(StreamFactory factory) throws IOException { |
| StreamExpression expression = new StreamExpression(factory.getFunctionName(this.getClass())); |
| |
| StringBuilder sb = new StringBuilder(); |
| for(String field : fields){ |
| if(sb.length() > 0){ sb.append(","); } |
| sb.append(field); |
| } |
| expression.addParameter(new StreamExpressionNamedParameter("fields",sb.toString())); |
| expression.addParameter(new StreamExpressionNamedParameter("delim",delim)); |
| expression.addParameter(new StreamExpressionNamedParameter("as",as)); |
| return expression; |
| } |
| |
| @Override |
| public Explanation toExplanation(StreamFactory factory) throws IOException { |
| return new Explanation(operationNodeId.toString()) |
| .withExpressionType(ExpressionType.OPERATION) |
| .withFunctionName(factory.getFunctionName(getClass())) |
| .withImplementingClass(getClass().getName()) |
| .withExpression(toExpression(factory).toString()); |
| } |
| |
| } |