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Hibernate's core ORM functionality

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.mapping;

import java.util.HashMap;
import java.util.Map;

import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.internal.util.StringHelper;

/**
 * A relational unique key constraint
 *
 * @author Brett Meyer
 */
public class UniqueKey extends Constraint {
	private java.util.Map columnOrderMap = new HashMap();

	@Override
	public String sqlConstraintString(
			Dialect dialect,
			String constraintName,
			String defaultCatalog,
			String defaultSchema) {
//		return dialect.getUniqueDelegate().uniqueConstraintSql( this );
		// Not used.
		return "";
	}

	@Override
	public String sqlCreateString(
			Dialect dialect,
			Mapping p,
			String defaultCatalog,
			String defaultSchema) {
		return null;
//		return dialect.getUniqueDelegate().getAlterTableToAddUniqueKeyCommand(
//				this, defaultCatalog, defaultSchema
//		);
	}

	@Override
	public String sqlDropString(
			Dialect dialect,
			String defaultCatalog,
			String defaultSchema) {
		return null;
//		return dialect.getUniqueDelegate().getAlterTableToDropUniqueKeyCommand(
//				this, defaultCatalog, defaultSchema
//		);
	}

	public void addColumn(Column column, String order) {
		addColumn( column );
		if ( StringHelper.isNotEmpty( order ) ) {
			columnOrderMap.put( column, order );
		}
	}

	public Map getColumnOrderMap() {
		return columnOrderMap;
	}

	public String generatedConstraintNamePrefix() {
		return "UK_";
	}

	@Override
	public String getExportIdentifier() {
		return StringHelper.qualify( getTable().getExportIdentifier(), "UK-" + getName() );
	}
}