org.apache.solr.client.solrj.io.ops.ConcatOperation Maven / Gradle / Ivy
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* 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 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());
}
}