gov.nyc.doitt.gis.geoclient.util.Assert.java Source code

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Here is the source code for gov.nyc.doitt.gis.geoclient.util.Assert.java

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/*
 * Copyright 2013-2016 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 gov.nyc.doitt.gis.geoclient.util;

import java.util.Collection;

/**
 * Copy of methods in org.springframework.util.Assert class to allow this 
 * framework to not depend on Spring.
 * 
 * @author mlipper
 *
 */
public abstract class Assert {
    /**
     * Assert that an object is not <code>null</code> .
     * <pre class="code">Assert.notNull(clazz, "The class must not be null");</pre>
     * @param object the object to check
     * @param message the exception message to use if the assertion fails
     * @throws IllegalArgumentException if the object is <code>null</code>
     */
    public static void notNull(Object object, String message) {
        if (object == null) {
            throw new IllegalArgumentException(message);
        }
    }

    /**
     * Assert that an object is not <code>null</code> .
     * <pre class="code">Assert.notNull(clazz);</pre>
     * @param object the object to check
     * @throws IllegalArgumentException if the object is <code>null</code>
     */
    public static void notNull(Object object) {
        notNull(object, "[Assertion failed] - this argument is required; it must not be null");
    }

    /**
     * Assert that a collection has elements; that is, it must not be
     * <code>null</code> and must have at least one element.
     * <pre class="code">Assert.notEmpty(collection, "Collection must have elements");</pre>
     * @param collection the collection to check
     * @param message the exception message to use if the assertion fails
     * @throws IllegalArgumentException if the collection is <code>null</code> or has no elements
     */
    public static void notEmpty(@SuppressWarnings("rawtypes") Collection collection, String message) {
        if (collection == null || collection.isEmpty()) {
            throw new IllegalArgumentException(message);
        }
    }
}