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Extensions to liquibase that make it more database agnostic

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// Copyright 2011 Leo Przybylski. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
//    1. Redistributions of source code must retain the above copyright notice, this list of
//       conditions and the following disclaimer.
//
//    2. Redistributions in binary form must reproduce the above copyright notice, this list
//       of conditions and the following disclaimer in the documentation and/or other materials
//       provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY  ''AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL  OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those of the
// authors and should not be interpreted as representing official policies, either expressed
// or implied, of Leo Przybylski.
package liquibase.change.ext;

import liquibase.change.*;
import liquibase.database.Database;
import liquibase.statement.SqlStatement;
import liquibase.statement.core.CreateIndexStatement;
import liquibase.util.StringUtils;

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

import static liquibase.ext.Constants.EXTENSION_PRIORITY;

/**
 * Overridden to remove schema dependent info
 *
 * @author Leo Przybylski (leo [at] rsmart.com)
 */
public class CreateIndexChange extends liquibase.change.core.CreateIndexChange {

    public CreateIndexChange() {
        setPriority(EXTENSION_PRIORITY);
    }

    public String getSchemaName() {
        return null;
    }

    public SqlStatement[] generateStatements(Database database) {
        List columns = new ArrayList();
        for (ColumnConfig column : getColumns()) {
            columns.add(column.getName());
        }

	    return new SqlStatement[]{
			    new CreateIndexStatement(
					    getIndexName(),
					    getSchemaName(),
					    getTableName(),
					    this.isUnique(),
					    getAssociatedWith(),
					    columns.toArray(new String[getColumns().size()]))
					    .setTablespace(getTablespace())
	    };
    }
}