/*
* Copyright 2009-2013 Scale Unlimited
*
* Licensed 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 bixo.examples.webmining;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.scaleunlimited.cascading.NullContext;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Function;
import cascading.operation.FunctionCall;
import cascading.operation.OperationCall;
import cascading.tuple.Fields;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntryCollector;
@SuppressWarnings("serial")
public class CreateResultsFunction extends BaseOperation<NullContext> implements Function<NullContext> {
private static final Logger LOGGER = LoggerFactory.getLogger(CreateResultsFunction.class);
public CreateResultsFunction() {
super(new Fields("line"));
}
@SuppressWarnings("rawtypes")
@Override
public void prepare(FlowProcess process, OperationCall<NullContext> operationCall) {
LOGGER.info("Starting creation of PageResults output");
super.prepare(process, operationCall);
}
@SuppressWarnings("rawtypes")
@Override
public void operate(FlowProcess process, FunctionCall<NullContext> funcCall) {
AnalyzedDatum datum = new AnalyzedDatum(funcCall.getArguments().getTuple());
TupleEntryCollector collector = funcCall.getOutputCollector();
PageResult[] pageResults = datum.getPageResults();
if (pageResults.length > 0) {
for (PageResult pageResult : pageResults) {
String outResult = String.format("%s\t%s\t%s", pageResult.getSourceUrl(), pageResult.getImageUrl(), pageResult.getDescription());
collector.add(new Tuple(outResult));
}
}
}
}