/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/*
* This is a modified version of the original Apache class. It has had unused
* members removed.
*/
package org.ehcache.impl.internal.classes.commonslang;
/**
* <p>This class assists in validating arguments. The validation methods are
* based along the following principles:
* <ul>
* <li>An invalid {@code null} argument causes a {@link NullPointerException}.</li>
* <li>A non-{@code null} argument causes an {@link IllegalArgumentException}.</li>
* <li>An invalid index into an array/collection/map/string causes an {@link IndexOutOfBoundsException}.</li>
* </ul>
*
* <p>All exceptions messages are
* <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax">format strings</a>
* as defined by the Java platform. For example:</li>
*
* <pre>
* Validate.isTrue(i > 0, "The value must be greater than zero: %d", i);
* Validate.notNull(surname, "The surname must not be %s", null);
* </pre>
*
* <p>#ThreadSafe#</li>
* @see java.lang.String#format(String, Object...)
* @since 2.0
*/
public class Validate {
/**
* Constructor. This class should not normally be instantiated.
*/
public Validate() {
super();
}
/**
* <p>Validate that the specified argument is not {@code null};
* otherwise throwing an exception with the specified message.
*
* <pre>Validate.notNull(myObject, "The object must not be null");</pre>
*
* @param <T> the object type
* @param object the object to check
* @param message the {@link String#format(String, Object...)} exception message if invalid, not null
* @param values the optional values for the formatted exception message
* @return the validated object (never {@code null} for method chaining)
* @throws NullPointerException if the object is {@code null}
* @see #notNull(Object)
*/
public static <T> T notNull(final T object, final String message, final Object... values) {
if (object == null) {
throw new NullPointerException(String.format(message, values));
}
return object;
}
}