StringHelper.java

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Ferenc Karsany
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

package org.obridge.util;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.text.WordUtils;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public final class StringHelper {

    private static Set<String> javaKeywords = new HashSet<>(Arrays.asList("abstract", "continue", "for", "new",
            "switch", "assert", "default", "goto", "package", "synchronized",
            "boolean", "do", "if", "private", "this", "break", "double",
            "implements", "protected", "throw", "byte", "else", "import",
            "public", "throws", "case", "enum", "instanceof", "return",
            "transient", "catch", "extends", "int", "short", "try", "char",
            "final", "interface", "static", "void", "class", "finally", "long",
            "strictfp", "volatile", "const", "float", "native", "super", "while"));

    private StringHelper() {
    }

    public static String toCamelCase(String s) {
        if (s == null) {
            return "";
        }
        return WordUtils.capitalizeFully(s, ' ', '_').replaceAll(" ", "").replaceAll("_", "");
    }

    public static String toCamelCaseSmallBegin(String s) {
        if (s == null) {
            return "";
        }
        String ss = toCamelCase(s);
        return ss.substring(0, 1).toLowerCase() + ss.substring(1);
    }

    public static String toOracleName(String s) {
        StringBuilder result = new StringBuilder();
        String currChar;
        if (s != null && !s.isEmpty()) {
            for (int i = 0; i < s.length(); i++) {
                currChar = s.substring(i, i + 1);
                if (i != 0 && StringUtils.isAllUpperCase(currChar)) {
                    result.append("_" + currChar);
                } else {
                    result.append(currChar);
                }
            }
        }
        return result.toString().toUpperCase().replaceAll("\\_\\_", "_");
    }

    public static boolean isJavaKeyword(String s) {
        return javaKeywords.contains(s.toLowerCase());
    }

    public static String unJavaKeyword(String s) {
        if (isJavaKeyword(s)) {
            return "p" + s.substring(0, 1).toUpperCase() + s.substring(1);
        }
        return s;
    }

}