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MySQL ORM framework for Java with Sharding supported

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package ormkids;

import java.util.StringJoiner;

public class Index {
	private String[] columns;
	private String[] fields;
	private boolean primaryKey;
	private boolean unique;

	public Index(boolean primaryKey, boolean unique, String... columns) {
		this.primaryKey = primaryKey;
		this.unique = unique;
		this.columns = columns;
	}

	public Index fields(String[] fields) {
		this.fields = fields;
		return this;
	}

	public String s() {
		var joiner = new StringJoiner(", ");
		for (var column : columns) {
			joiner.add(String.format("`%s`", column));
		}
		if (primaryKey) {
			return String.format("primary key(%s)", joiner.toString());
		}
		if (unique) {
			return String.format("unique key(%s)", joiner.toString());
		}
		return String.format("key(%s)", joiner.toString());
	}

	public String[] columns() {
		return columns;
	}

	public String[] fields() {
		return fields;
	}

	public boolean primaryKey() {
		return primaryKey;
	}

	public boolean unique() {
		return unique;
	}
}