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Annotations-Driven Java Domain Model Syntactic and Semantic Validation

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/*
    Copyright 2010, Strategic Gains, 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 com.strategicgains.syntaxe.util;

import java.util.List;

/**
 * @author toddf
 * @since Oct 7, 2010
 */
public class Validations
{
	private static final String MAX_LENGTH_ERROR = "%s is limited to %d characters";
	private static final String MIN_LENGTH_ERROR = "%s must contain at least %d characters";
	private static final String LESS_THAN_OR_EQUAL_ERROR = "%s must be less-than or equal-to %d";
	private static final String GREATER_THAN_OR_EQUAL_ERROR = "%s must be greater-than or equal-to %d";
	
	private Validations()
	{
		// Prevent instantiation.
	}

	public static void require(String name, String value, List errors)
	{
    	if (value == null || value.trim().isEmpty())
    	{
    		errors.add(name + " is required");
    	}
	}
	
	public static void maxLength(String name, String value, int max, List errors)
	{
		if (value == null) return;
		
		if (value.length() > max)
		{
			errors.add(String.format(MAX_LENGTH_ERROR, name, max));
		}
	}
	
	public static void minLength(String name, String value, int min, List errors)
	{
		if (value == null) return;
		
		if (value.length() < min)
		{
			errors.add(String.format(MIN_LENGTH_ERROR, name, min));
		}
	}

	public static void lessThanOrEqual(String name, int actual, int max, List errors)
	{
		if (actual > max)
		{
			errors.add(String.format(LESS_THAN_OR_EQUAL_ERROR, name, max));
		}
	}

	public static void greaterThanOrEqual(String name, int actual, int min, List errors)
	{
		if (actual < min)
		{
			errors.add(String.format(GREATER_THAN_OR_EQUAL_ERROR, name, min));
		}
	}
}