org.sfm.csv.impl.writer.FormattingAppender Maven / Gradle / Ivy

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package org.sfm.csv.impl.writer;


import org.sfm.map.FieldMapper;
import org.sfm.map.MappingContext;
import org.sfm.reflect.Getter;

import java.text.Format;

import static org.sfm.utils.Asserts.requireNonNull;

public class FormattingAppender implements FieldMapper {

    private final Getter getter;
    private final Getter, Format> formatAccessor;

    public FormattingAppender(Getter getter, Getter, Format> formatAccessor) {
        this.getter = getter;
        this.formatAccessor = formatAccessor;
    }

    @Override
    public void mapTo(S source, Appendable target, MappingContext context) throws Exception {
        Object o = getter.get(source);
        if (o != null) {
            Format format = formatAccessor.get(context);
            requireNonNull("Format in mapping context", format);
            target.append(format.format(o));
        }
    }
}