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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.store;

import org.datavec.dataframe.columns.Column;
import org.datavec.dataframe.api.ColumnType;
import com.google.gson.Gson;

/**
 * Data about a specific column used in it's persistence
 */
public class ColumnMetadata {

    static final Gson GSON = new Gson();

    private final String id;

    private final String name;

    private final ColumnType type;

    private final int size;

    public ColumnMetadata(Column column) {
        this.id = column.id();
        this.name = column.name();
        this.type = column.type();
        this.size = column.size();
    }

    public String toJson() {
        return GSON.toJson(this);
    }

    public static ColumnMetadata fromJson(String jsonString) {
        return GSON.fromJson(jsonString, ColumnMetadata.class);
    }

    @Override
    public String toString() {
        return "ColumnMetadata{" + "id='" + id + '\'' + ", name='" + name + '\'' + ", type=" + type + ", size=" + size
                        + '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;

        ColumnMetadata that = (ColumnMetadata) o;

        if (size != that.size)
            return false;
        if (!id.equals(that.id))
            return false;
        if (!name.equals(that.name))
            return false;
        return type == that.type;
    }

    @Override
    public int hashCode() {
        int result = id.hashCode();
        result = 31 * result + name.hashCode();
        result = 31 * result + type.hashCode();
        result = 31 * result + size;
        return result;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public ColumnType getType() {
        return type;
    }

    public int getSize() {
        return size;
    }
}