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/*
 * Copyright 2013 Gregory Graham.
 *
 * 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 nz.co.gregs.dbvolution.operators;

import java.util.ArrayList;
import java.util.Collection;
import static nz.co.gregs.dbvolution.datatypes.QueryableDatatype.getQueryableDatatypeForObject;
import nz.co.gregs.dbvolution.expressions.DBExpression;

/**
 * Provides an operator that checks that the column matches the provided values.
 *
 * Creates a virtual operator that provides access to the ISNULL, EQUALS, or IN
 * operator as required.
 *
 * Support DBvolution at
 * Patreon
 *
 * @author Gregory Graham
 * @param 
 */
public class DBPermittedValuesOperator extends DBMetaOperator {

	private static final long serialVersionUID = 1L;

	/**
	 * Provides an operator that checks that the column matches the provided
	 * values.
	 *
	 * Creates a virtual operator that provides access to the ISNULL, EQUALS, or
	 * IN operator as required.
	 *
	 * @param permitted a list of strings that are permitted values.
	 */
	public DBPermittedValuesOperator(Collection permitted) {
		ArrayList expressions = new ArrayList<>();
		int objectCount = 0;
		if (permitted == null) {
			operator = new DBIsNullOperator();
		} else {
			for (T obj : permitted) {
				if (obj == null) {
					this.includeNulls = true;
					objectCount++;
				} else if (obj instanceof Collection) {
					@SuppressWarnings("unchecked")
					Collection