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jdbacl stands for 'Java DataBase ACcess Layer' and provides utilities for accessing JDBC databases from Java programs, retrieving meta information in an object model and querying database data.

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/*
 * (c) Copyright 2006-2011 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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.
 */

package org.databene.jdbacl.model;

import java.util.Arrays;

import org.databene.commons.ArrayUtil;
import org.databene.commons.NullSafeComparator;
import org.databene.jdbacl.NameSpec;
import org.databene.jdbacl.SQLUtil;

/**
 * Represents a unique constraint on one or the combination of several columns of one table.

 * 

 * Created: 06.01.2007 09:00:37
 * @author Volker Bergmann
 */
public class DBUniqueConstraint extends DBConstraint implements MultiColumnObject {

    private static final long serialVersionUID = -8241121848879185421L;
    
	private String[] columnNames;

    /**
     * @param name the constraint name - it may be null
     * @param columnNames the names of the columns to which the constraint applies
     */
    public DBUniqueConstraint(DBTable owner, String name, boolean nameDeterministic, String... columnNames) {
        super(name, nameDeterministic, "unique constraint", owner);
        this.columnNames = columnNames;
        if (getClass() == DBUniqueConstraint.class)
        	owner.addUniqueConstraint(this);
    }

    @Override
    public String[] getColumnNames() {
        return columnNames;
    }

	public void addColumnName(String columnName) {
		if (!ArrayUtil.contains(columnName, columnNames))
			columnNames = ArrayUtil.append(columnName, columnNames);
	}
	
	public boolean isIdentical(DBObject other) {
		if (this == other)
			return true;
		if (other == null || !(other instanceof DBUniqueConstraint))
			return false;
		DBUniqueConstraint that = (DBUniqueConstraint) other;
		return NullSafeComparator.equals(this.name, that.name)
			&& Arrays.equals(this.columnNames, that.columnNames)
			&& NullSafeComparator.equals(this.getTable().getName(), that.getTable().getName());
	}

	@Override
	public String toString() {
		return SQLUtil.ukSpec(this, NameSpec.ALWAYS);
	}

}