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/*******************************************************************************
 * Copyright 2013 Francesco Cina'
 * 
 * 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.
 ******************************************************************************/
/* ----------------------------------------------------------------------------
 *     PROJECT : JPOrm
 *
 *  CREATED BY : Francesco Cina'
 *          ON : Feb 12, 2013
 * ----------------------------------------------------------------------------
 */
package com.jporm.sql.util;

/**
 * 
 * 
 * notes:
 * 

 * ON : Feb 12, 2013
 *
 * @author Francesco Cina'
 * @version $Revision
 */
public class StringUtil {

    /**
     * 

     * Checks if String contains a search String irrespective of case, handling
     * null. Case-insensitivity is defined as by
     * {@link String#equalsIgnoreCase(String)}.
     *
     * 

     * A null String will return false.
     * 
     *
     *      * StringUtils.contains(null, *) = false
     * StringUtils.contains(*, null) = false
     * StringUtils.contains("", "") = true
     * StringUtils.contains("abc", "") = true
     * StringUtils.contains("abc", "a") = true
     * StringUtils.contains("abc", "z") = false
     * StringUtils.contains("abc", "A") = true
     * StringUtils.contains("abc", "Z") = false
     * 
     *
     * @param str
     *            the String to check, may be null
     * @param searchStr
     *            the String to find, may be null
     * @return true if the String contains the search String irrespective of
     *         case or false if not or null string input
     */
    public static boolean containsIgnoreCase(final String str, final String searchStr) {
        if ((str == null) || (searchStr == null)) {
            return false;
        }
        int len = searchStr.length();
        int max = str.length() - len;
        for (int i = 0; i <= max; i++) {
            if (str.regionMatches(true, i, searchStr, 0, len)) {
                return true;
            }
        }
        return false;
    }

    private StringUtil() {
    }

}