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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013, KleeGroup, [email protected] (http://www.kleegroup.com)
 * KleeGroup, Centre d'affaire la Boursidiere - BP 159 - 92357 Le Plessis Robinson Cedex - France
 *
 * 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 io.vertigo.dynamox.search.dsl.rules;

/**
 * Util for DSL.
 * @author npiedeloup
 */
final class DslUtil {

	private DslUtil() {
		//nothing
	}

	/**
	 * Convert String null to Empty string.
	 * @param input Nullable input
	 * @return input or ""
	 */
	static String nullToEmpty(final String input) {
		return input == null ? "" : input;
	}

	/**
	 * Concat nullable elements.
	 * @param elements Nullable elements
	 * @return Concat string
	 */
	static String concat(final String... elements) {
		boolean allNull = true;
		final StringBuilder sb = new StringBuilder();
		for (final String element : elements) {
			if (element != null) {
				allNull = false;
				sb.append(element);
			}
		}
		return allNull ? null : sb.toString();
	}
}