CamelCaseUtil.java

/*
 * Copyright 2014 MOSPA(Ministry of Security and Public Administration).
 *
 * 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 egovframework.rte.fdl.security.userdetails.util;

/**
 * camel case 방식으로 변환하는 util 클래스
 *
 *<p>Desc.: </p>
 *
 * @author Vincent Han
 * @since 2014.03.12
 * @version 3.0
 * @see <pre>
 *  == 개정이력(Modification Information) ==
 *
 *   수정일				수정자		수정내용
 *  ---------------------------------------------------------------------------------
 *   2014.03.12	한성곤		Spring Security 설정 간소화 기능 추가
 *
 * </pre>
 */
public final class CamelCaseUtil {
	private CamelCaseUtil() {
		// no-op
	}
	
	public static String convert2CamelCase(String underScore) {

		if (isSkipCase(underScore)) {
			return underScore;
		}

		StringBuilder result = new StringBuilder();
		boolean nextUpper = false;
		int len = underScore.length();

		for (int i = 0; i < len; i++) {
			char currentChar = underScore.charAt(i);
			if (currentChar == '_') {
				nextUpper = true;
			} else {
				if (nextUpper) {
					result.append(Character.toUpperCase(currentChar));
					nextUpper = false;
				} else {
					result.append(Character.toLowerCase(currentChar));
				}
			}
		}
		return result.toString();
	}

	protected static boolean isSkipCase(String underScore) {
		return underScore.indexOf('_') < 0 && Character.isLowerCase(underScore.charAt(0));
	}
}