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API.AI Java SDK allows using voice commands and integration with dialog scenarios defined for a particular agent in API.AI.

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package ai.api.util;

/***********************************************************************************************************************
*
* API.AI Java SDK - client-side libraries for API.AI
* =================================================
*
* Copyright (C) 2016 by Speaktoit, Inc. (https://www.speaktoit.com)
* https://www.api.ai
*
***********************************************************************************************************************
*
* 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.
*
***********************************************************************************************************************/

/**
 * A small set of string utils functions
 */
public class StringUtils {
	/**
     * Checks if a CharSequence is null or has no characters.
     * @param value  the CharSequence to check
     * @return {@code true} if the CharSequence is null or null
     */
	public static boolean isEmpty(final CharSequence value) {
		return (value == null) || (value.length() == 0);
	}
}