src/game/java/net/minecraft/util/CsvOutput.java

package net.minecraft.util;

import com.google.common.collect.Lists;
import java.io.IOException;
import java.io.Writer;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.Nullable;
import org.apache.commons.lang3.StringEscapeUtils;

public class CsvOutput {
    private static final String LINE_SEPARATOR = "\r\n";
    private static final String FIELD_SEPARATOR = ",";
    private final Writer output;
    private final int columnCount;

    CsvOutput(Writer p_13613_, List<String> p_13614_) throws IOException {
        this.output = p_13613_;
        this.columnCount = p_13614_.size();
        this.writeLine(p_13614_.stream());
    }

    public static CsvOutput.Builder builder() {
        return new CsvOutput.Builder();
    }

    public void writeRow(Object... p_13625_) throws IOException {
        if (p_13625_.length != this.columnCount) {
            throw new IllegalArgumentException("Invalid number of columns, expected " + this.columnCount + ", but got " + p_13625_.length);
        } else {
            this.writeLine(Stream.of(p_13625_));
        }
    }

    private void writeLine(Stream<?> p_13623_) throws IOException {
        this.output.write(p_13623_.map(CsvOutput::getStringValue).collect(Collectors.joining(",")) + "\r\n");
    }

    private static String getStringValue(@Nullable Object p_13621_) {
        return StringEscapeUtils.escapeCsv(p_13621_ != null ? p_13621_.toString() : "[null]");
    }

    public static class Builder {
        private final List<String> headers = Lists.newArrayList();

        public CsvOutput.Builder addColumn(String p_13631_) {
            this.headers.add(p_13631_);
            return this;
        }

        public CsvOutput build(Writer p_13629_) throws IOException {
            return new CsvOutput(p_13629_, this.headers);
        }
    }
}