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| public class FreeTextAggregatorOnServiceCode extends Aggregator<Row, FreeTextHolder, String> {
private static final long serialVersionUID = 5811361034278939542L;
private final String serviceCode;
public FreeTextAggregatorOnServiceCode(final String serviceCode) {
Preconditions.checkArgument(Strings.isNotEmpty(serviceCode));
this.serviceCode = serviceCode;
}
@Override
public Encoder<FreeTextHolder> bufferEncoder() {
return Encoders.bean(FreeTextHolder.class);
}
@Override
public String finish(final FreeTextHolder arg0) {
return null;
}
@Override
public FreeTextHolder merge(FreeTextHolder left, FreeTextHolder right ) {
FreeTextHolder result = new FreeTextHolder();
if (Strings.isNotEmpty(left.getFreeText())) {
result.setFreeText(left.getFreeText());
} else {
result.setFreeText(right.getFreeText());
}
return result;
}
@Override
public Encoder<String> outputEncoder() {
return Encoders.STRING();
}
@Override
public FreeTextHolder reduce(FreeTextHolder buffer, Row row) {
if (!serviceCode.equals(row.getString(row.fieldIndex("SERVICECODE")))) {
return buffer;
}
buffer.setFreeText(row.getString(row.fieldIndex("FREETEXT")));
return buffer;
}
@Override
public FreeTextHolder zero() {
return new FreeTextHolder();
}
}
public class FreeTextHolder implements Serializable {
private static final long serialVersionUID = 6941403631962694716L;
private String freeText;
public String getFreeText() {
return freeText;
}
public void setFreeText(final String freeText) {
this.freeText = freeText;
}
} |
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