Main.java Source code

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/*
 * 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.
 */

/**
 * <p>Operations on boolean primitives and Boolean objects.</p>
 *
 * <p>This class tries to handle <code>null</code> input gracefully.
 * An exception will not be thrown for a <code>null</code> input.
 * Each method documents its behaviour in more detail.</p>
 * 
 * @author Stephen Colebourne
 * @author Matthew Hawthorne
 * @author Gary Gregory
 * @since 2.0
 * @version $Id: BooleanUtils.java 589050 2007-10-27 05:07:45Z bayard $
 */
public class Main {
    /**
     * <p>Checks if a <code>Boolean</code> value is <i>not</i> <code>false</code>,
     * handling <code>null</code> by returning <code>true</code>.</p>
     *
     * <pre>
     *   BooleanUtils.isNotFalse(Boolean.TRUE)  = true
     *   BooleanUtils.isNotFalse(Boolean.FALSE) = false
     *   BooleanUtils.isNotFalse(null)          = true
     * </pre>
     *
     * @param bool  the boolean to check, null returns <code>true</code>
     * @return <code>true</code> if the input is null or true
     * @since 2.3
     */
    public static boolean isNotFalse(Boolean bool) {
        return !isFalse(bool);
    }

    /**
     * <p>Checks if a <code>Boolean</code> value is <code>false</code>,
     * handling <code>null</code> by returning <code>false</code>.</p>
     *
     * <pre>
     *   BooleanUtils.isFalse(Boolean.TRUE)  = false
     *   BooleanUtils.isFalse(Boolean.FALSE) = true
     *   BooleanUtils.isFalse(null)          = false
     * </pre>
     *
     * @param bool  the boolean to check, null returns <code>false</code>
     * @return <code>true</code> only if the input is non-null and false
     * @since 2.1
     */
    public static boolean isFalse(Boolean bool) {
        if (bool == null) {
            return false;
        }
        return bool.booleanValue() ? false : true;
    }

}