/**
 * Copyright 2010 JBoss Inc
 *
 * 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.drools.factconstraints.server.factory;

import org.drools.factconstraints.client.ConstraintConfiguration;
import org.drools.factconstraints.server.Constraint;
import org.drools.factconstraints.server.predefined.IntegerConstraint;
import org.drools.factconstraints.server.predefined.InvalidFieldConstraint;
import org.drools.factconstraints.server.predefined.MatchesConstraint;
import org.drools.factconstraints.server.predefined.NotMatchesConstraint;
import org.drools.factconstraints.server.predefined.NotNullConstraint;
import org.drools.factconstraints.server.predefined.RangeConstraint;

public class ConstraintsFactory {
	private final static ConstraintsFactory INSTANCE = new ConstraintsFactory();
	
	public static ConstraintsFactory getInstance() {
		return INSTANCE;
	}
	
	private ConstraintsFactory() {}
	
	public Constraint buildConstraint(ConstraintConfiguration config) {
		if (NotNullConstraint.NAME.equals(config.getConstraintName())) {
			return new NotNullConstraint();
		} else if (IntegerConstraint.NAME.equals(config.getConstraintName())) {
			return new IntegerConstraint();
		} else if (RangeConstraint.NAME.equals(config.getConstraintName())) {
			return new RangeConstraint();
		} else if (NotMatchesConstraint.NAME.equals(config.getConstraintName())) {
			return new NotMatchesConstraint();
		}else if (MatchesConstraint.NAME.equals(config.getConstraintName())) {
			return new MatchesConstraint();
		}else if (InvalidFieldConstraint.NAME.equals(config.getConstraintName())) {
			return new InvalidFieldConstraint();
		} else {
			throw new IllegalArgumentException("Constraint unknown: " + config.getConstraintName());
		}
	}
	
	public String getVerifierRule(ConstraintConfiguration config) {
		return buildConstraint(config).getVerifierRule(config);
	}
}