de.olivergierke.whoops.customer.CustomerNumber.java Source code

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Here is the source code for de.olivergierke.whoops.customer.CustomerNumber.java

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/*
 * Copyright 2011-2013 the original author or authors.
 *
 * 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 de.olivergierke.whoops.customer;

import javax.persistence.Embeddable;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Value object to represent customer numbers.
 * 
 * @author Oliver Gierke
 */
@Embeddable
public class CustomerNumber {

    static final int LENGTH = 10;

    private static final String REGEX = "[A-Z0-9]{" + LENGTH + "}";
    private final String number;

    /**
     * Creates a new {@link CustomerNumber} from the given {@link String}.
     * 
     * @param number must not be {@literal null} or empty.
     */
    CustomerNumber(String number) {

        Assert.isTrue(isValid(number));
        this.number = number;
    }

    /**
     * Returns whether the given {@link String} is a valid {@link CustomerNumber}.
     * 
     * @param number
     * @return
     */
    public static boolean isValid(String number) {
        return StringUtils.hasText(number) && number.matches(REGEX);
    }

    /*
     * (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return number;
    }
}