/*
 * Copyright (C) 2005-2011 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.util.schemacomp;

import org.alfresco.util.schemacomp.model.Schema;

/**
 * Compares two abstract database schemas, a 'left' schema and a 'right' schema. The left schema is the primary
 * schema and all objects in the right schema are judged relative to it.
 * 
 * @author Matt Ward
 */
public class SchemaComparator
{
    private final Schema leftSchema;
    private final Schema rightSchema;
    private final Differences differences = new Differences();
    
    /**
     * Construct a comparator to compare schemas left and right.
     * 
     * @param left
     * @param right
     */
    public SchemaComparator(Schema left, Schema right)
    {
        this.leftSchema = left;
        this.rightSchema = right;
    }
    
    
    public void compare()
    {
        // Check the left schema against the right schema and record any differences.
        leftSchema.diff(rightSchema, differences);
    }


    /**
     * @return the differences
     */
    public Differences getDifferences()
    {
        return this.differences;
    }
}