tech.tablesaw.aggregate.StringAggregateFunction Maven / Gradle / Ivy
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package tech.tablesaw.aggregate;
import tech.tablesaw.api.ColumnType;
import tech.tablesaw.api.StringColumn;
/**
* A partial implementation of aggregate functions to summarize over a StringColumn and return a
* String
*/
public abstract class StringAggregateFunction extends AggregateFunction {
/**
* Constructs an {@code StringFunction} with the given name. The name may be used to name a column
* in the output when this function is used by {@link Summarizer}
*/
public StringAggregateFunction(String name) {
super(name);
}
public abstract String summarize(StringColumn column);
/** {@inheritDoc} */
@Override
public boolean isCompatibleColumn(ColumnType type) {
return type.equals(ColumnType.STRING);
}
/** {@inheritDoc} */
@Override
public ColumnType returnType() {
return ColumnType.STRING;
}
}