OperatorSign.java

/*
 * Copyright 2011-2017 Kay Stenschke
 *
 * 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 com.kstenschke.shifter.models.shiftableTypes;

public class OperatorSign {

    /**
     * @param  word     String to be shifted currently
     * @return boolean
     */
    public static boolean isOperatorSign(String word) {
        return word != null && word.length() == 1 && "+-<>*/%".contains(word);
    }

    public static boolean isWhitespaceWrappedOperator(String str) {
        return Character.isWhitespace(str.charAt(0))
                && OperatorSign.isOperatorSign(String.valueOf(str.charAt(1)))
                && Character.isWhitespace(str.charAt(2));
    }

    /**
     * Shift mono-character string
     *
     * @param  word     Quoted word to be shifted
     * @return String
     */
    public String getShifted(String word) {
        if ("-".equals(word)) {
            return "+";
        }
        if ("+".equals(word)) {
            return "-";
        }
        if ("<".equals(word)) {
            return ">";
        }
        if (">".equals(word)) {
            return "<";
        }
        if ("*".equals(word)) {
            return "/";
        }
        if ("/".equals(word)) {
            return "*";
        }

        return word;
    }
}