/*
 *  Copyright 2006 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.ibatis.ibator.internal.rules;

import org.apache.ibatis.ibator.api.IntrospectedTable;

/**
 * This class encapsulates all the code generation rules for 
 * a table using the conditional model.  In this model we do not
 * generate primary key or record with BLOBs classes if the class
 * would only hold one field.
 * 
 * @author Jeff Butler
 *
 */
public class ConditionalModelRules extends BaseIbatorRules {

    /**
     * 
     */
    public ConditionalModelRules(IntrospectedTable introspectedTable) {
        super(introspectedTable);
    }

    /**
     * We generate a primary key if there is more than one primary key
     * field.
     * 
     * @return true if the primary key should be generated
     */
    public boolean generatePrimaryKeyClass() {
        return introspectedTable.getPrimaryKeyColumns().size() > 1;
    }

    /**
     * Generate a base record if there are any base columns,
     * or if there is only one primary key coulmn (in which case
     * we will not generate a primary key class), or if there is only one
     * BLOB column (in which case we will not generate a record with
     * BLOBs class).
     * 
     * @return true if the class should be generated
     */
    public boolean generateBaseRecordClass() {
        return introspectedTable.getBaseColumns().size() > 0
            || introspectedTable.getPrimaryKeyColumns().size() == 1
            || (introspectedTable.getBLOBColumns().size() > 0
                    && !generateRecordWithBLOBsClass());
        
    }

    /**
     * We generate a record with BLOBs class if there is more than one
     * BLOB column.  Do not generate a BLOBs class if any other
     * super class would only contain one field
     * 
     * @return true if the record with BLOBs class should be generated
     */
    public boolean generateRecordWithBLOBsClass() {
        int otherColumnCount = introspectedTable.getPrimaryKeyColumns().size()
            + introspectedTable.getBaseColumns().size();
        
        return otherColumnCount > 1 
            && introspectedTable.getBLOBColumns().size() > 1;
    }
}