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ValidationPreconditions.java
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ValidationPreconditions.java
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/*******************************************************************************
* Copyright (c) 2015, 2016 David Green.
*
* 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 greensopinion.finance.services;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.text.MessageFormat.format;
public class ValidationPreconditions {
public static void validateNotNull(Object value, String message) {
validate(value != null, message);
}
public static void validateNotNullOrEmpty(String value, String message) {
validate(value != null && !value.trim().isEmpty(), message);
}
public static void validateRequired(String value, String propertyName) {
validateNotNullOrEmpty(value, format("{0} must be specified.", propertyName));
}
public static void validate(boolean condition, String message) {
checkMessage(message);
if (!condition) {
throw new ValidationException(message);
}
}
private static void checkMessage(String message) {
checkNotNull(message);
checkArgument(!message.isEmpty());
checkArgument(message.charAt(0) == Character.toUpperCase(message.charAt(0)),
"Message must start with an upper-case letter");
checkArgument(message.charAt(message.length() - 1) == '.', "Message must end with a period");
}
private ValidationPreconditions() {
// prevent instantiation
}
}