source: PerfectFit/Dialog/src/main/java/tudelft/mentalhealth/perfectfit/updatefuncs/StringLength.java

package tudelft.mentalhealth.perfectfit.updatefuncs;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import tudelft.dialogmanager.parameters.DoubleValue;
import tudelft.dialogmanager.parameters.Parameters;
import tudelft.dialogmanager.updatefunctions.UpdateFunction;

/**
 * Function to get length of a param.
 *
 */
public class StringLength implements UpdateFunction {
        private String paramname;
        private String lengthname;

        /**
         * @param paramname  the name of the param to get string length of.
         * @param lengthname the name of the param to put the length in
         */
        @JsonCreator
        public StringLength(@JsonProperty("paramname") String paramname,
                        @JsonProperty("lengthname") String lengthname) throws IOException {
                this.paramname = paramname;
                this.lengthname = lengthname;
        }

        @Override
        public Parameters call(Parameters parameters) {
                return parameters.with(lengthname, new DoubleValue(
                                (double) parameters.get(paramname).toString().length()));
        }

        @Override
        public List<String> getAssignedParameters() {
                return Arrays.asList(lengthname);
        }

}