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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.tool.schema.extract.internal;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.hibernate.boot.model.naming.Identifier;
import org.hibernate.tool.schema.extract.spi.ColumnInformation;
import org.hibernate.tool.schema.extract.spi.IndexInformation;
import org.hibernate.tool.schema.spi.SchemaManagementException;

/**
 * @author Steve Ebersole
 */
public class IndexInformationImpl implements IndexInformation {
	private final Identifier indexIdentifier;
	private final List columnList;

	public IndexInformationImpl(Identifier indexIdentifier, List columnList) {
		this.indexIdentifier = indexIdentifier;
		this.columnList = columnList;
	}

	@Override
	public Identifier getIndexIdentifier() {
		return indexIdentifier;
	}

	@Override
	public List getIndexedColumns() {
		return columnList;
	}

	public static Builder builder(Identifier indexIdentifier) {
		return new Builder( indexIdentifier );
	}

	public static class Builder {
		private final Identifier indexIdentifier;
		private final List columnList = new ArrayList();

		public Builder(Identifier indexIdentifier) {
			this.indexIdentifier = indexIdentifier;
		}

		public Builder addColumn(ColumnInformation columnInformation) {
			columnList.add( columnInformation );
			return this;
		}

		public IndexInformationImpl build() {
			if ( columnList.isEmpty() ) {
				throw new SchemaManagementException(
						"Attempt to resolve JDBC metadata failed to find columns for index [" + indexIdentifier.getText() + "]"
				);
			}
			return new IndexInformationImpl( indexIdentifier, Collections.unmodifiableList( columnList ) );
		}
	}
}