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High-performance Java Dataframe with integrated columnar storage (fork of tablesaw)

There is a newer version: 0.9.1

package org.datavec.dataframe.columns;

import org.datavec.dataframe.store.ColumnMetadata;
import org.apache.commons.lang3.StringUtils;

import java.util.UUID;

/**
 * Partial implementation of the {@link Column} interface
 */
public abstract class AbstractColumn implements Column {

  private String id;

  private String name;

  private String comment;

  public AbstractColumn(String name) {
    this.name = name;
    this.comment = "";
    this.id = UUID.randomUUID().toString();
  }

  public AbstractColumn(ColumnMetadata metadata) {
    this.name = metadata.getName();
    this.comment = "";
    this.id = metadata.getId();
  }

  public String name() {
    return name;
  }

  public String id() {
    return id;
  }

  @Override
  public String metadata() {
    return columnMetadata().toJson();
  }

  /**
   * Sets the columns name to the given string
   *
   * @param name  The new name MUST be unique for any table containing this column
   */
  public void setName(String name) {
    this.name = name;
  }

  public abstract void addCell(String stringvalue);

  @Override
  public String comment() {
    return comment;
  }

  @Override
  public void setComment(String comment) {
    this.comment = comment;
  }

  @Override
  public ColumnMetadata columnMetadata() {
    return new ColumnMetadata(this);
  }

  /**
   * Returns the width of the column in characters, for printing
   */
  @Override
  public int columnWidth() {

    int width = name().length();
    for (int rowNum = 0; rowNum < size(); rowNum++) {
      width = Math.max(width, StringUtils.length(getString(rowNum)));
    }
    return width;
  }

  @Override
  public E difference() {
    throw new UnsupportedOperationException("difference() method not supported for all data types");
  }

}