HybridRow/java/src/main/java/tangible/StringHelper.java

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

package tangible;

public final class StringHelper {
    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'IndexOfAny' (1 parameter version).
    //------------------------------------------------------------------------------------
    public static int indexOfAny(String string, char[] anyOf) {
        int lowestIndex = -1;
        for (char c : anyOf) {
            int index = string.indexOf(c);
            if (index > -1) {
                if (lowestIndex == -1 || index < lowestIndex) {
                    lowestIndex = index;

                    if (index == 0) {
                        break;
                    }
                }
            }
        }

        return lowestIndex;
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'IndexOfAny' (2 parameter version).
    //------------------------------------------------------------------------------------
    public static int indexOfAny(String string, char[] anyOf, int startIndex) {
        int indexInSubstring = indexOfAny(string.substring(startIndex), anyOf);
        if (indexInSubstring == -1) {
            return -1;
        } else {
            return indexInSubstring + startIndex;
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'IndexOfAny' (3 parameter version).
    //------------------------------------------------------------------------------------
    public static int indexOfAny(String string, char[] anyOf, int startIndex, int count) {
        int endIndex = startIndex + count;
        int indexInSubstring = indexOfAny(string.substring(startIndex, endIndex), anyOf);
        if (indexInSubstring == -1) {
            return -1;
        } else {
            return indexInSubstring + startIndex;
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET static string method 'IsNullOrEmpty'.
    //------------------------------------------------------------------------------------
    public static boolean isNullOrEmpty(String string) {
        return string == null || string.length() == 0;
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET static string method 'IsNullOrWhiteSpace'.
    //------------------------------------------------------------------------------------
    public static boolean isNullOrWhiteSpace(String string) {
        if (string == null) {
            return true;
        }

        for (int index = 0; index < string.length(); index++) {
            if (!Character.isWhitespace(string.charAt(index))) {
                return false;
            }
        }

        return true;
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET static string method 'Join' (2 parameter version).
    //------------------------------------------------------------------------------------
    public static String join(String separator, String[] stringArray) {
        if (stringArray == null) {
            return null;
        } else {
            return join(separator, stringArray, 0, stringArray.length);
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET static string method 'Join' (4 parameter version).
    //------------------------------------------------------------------------------------
    public static String join(String separator, String[] stringArray, int startIndex, int count) {
        String result = "";

        if (stringArray == null) {
            return null;
        }

        for (int index = startIndex; index < stringArray.length && index - startIndex < count; index++) {
            if (separator != null && index > startIndex) {
                result += separator;
            }

            if (stringArray[index] != null) {
                result += stringArray[index];
            }
        }

        return result;
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'LastIndexOf' (char version).
    //------------------------------------------------------------------------------------
    public static int lastIndexOf(String string, char value, int startIndex, int count) {
        int leftMost = startIndex + 1 - count;
        int rightMost = startIndex + 1;
        String substring = string.substring(leftMost, rightMost);
        int lastIndexInSubstring = substring.lastIndexOf(value);
        if (lastIndexInSubstring < 0) {
            return -1;
        } else {
            return lastIndexInSubstring + leftMost;
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'LastIndexOf' (string version).
    //------------------------------------------------------------------------------------
    public static int lastIndexOf(String string, String value, int startIndex, int count) {
        int leftMost = startIndex + 1 - count;
        int rightMost = startIndex + 1;
        String substring = string.substring(leftMost, rightMost);
        int lastIndexInSubstring = substring.lastIndexOf(value);
        if (lastIndexInSubstring < 0) {
            return -1;
        } else {
            return lastIndexInSubstring + leftMost;
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'LastIndexOfAny' (1 parameter version).
    //------------------------------------------------------------------------------------
    public static int lastIndexOfAny(String string, char[] anyOf) {
        int highestIndex = -1;
        for (char c : anyOf) {
            int index = string.lastIndexOf(c);
            if (index > highestIndex) {
                highestIndex = index;

                if (index == string.length() - 1) {
                    break;
                }
            }
        }

        return highestIndex;
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'LastIndexOfAny' (2 parameter version).
    //------------------------------------------------------------------------------------
    public static int lastIndexOfAny(String string, char[] anyOf, int startIndex) {
        String substring = string.substring(0, startIndex + 1);
        int lastIndexInSubstring = lastIndexOfAny(substring, anyOf);
        if (lastIndexInSubstring < 0) {
            return -1;
        } else {
            return lastIndexInSubstring;
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'LastIndexOfAny' (3 parameter version).
    //------------------------------------------------------------------------------------
    public static int lastIndexOfAny(String string, char[] anyOf, int startIndex, int count) {
        int leftMost = startIndex + 1 - count;
        int rightMost = startIndex + 1;
        String substring = string.substring(leftMost, rightMost);
        int lastIndexInSubstring = lastIndexOfAny(substring, anyOf);
        if (lastIndexInSubstring < 0) {
            return -1;
        } else {
            return lastIndexInSubstring + leftMost;
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'PadLeft' (1 parameter version).
    //------------------------------------------------------------------------------------
    public static String padLeft(String string, int totalWidth) {
        return padLeft(string, totalWidth, ' ');
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'PadLeft' (2 parameter version).
    //------------------------------------------------------------------------------------
    public static String padLeft(String string, int totalWidth, char paddingChar) {
        StringBuilder sb = new StringBuilder();

        while (sb.length() + string.length() < totalWidth) {
            sb.append(paddingChar);
        }

        sb.append(string);
        return sb.toString();
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'PadRight' (1 parameter version).
    //------------------------------------------------------------------------------------
    public static String padRight(String string, int totalWidth) {
        return padRight(string, totalWidth, ' ');
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'PadRight' (2 parameter version).
    //------------------------------------------------------------------------------------
    public static String padRight(String string, int totalWidth, char paddingChar) {
        StringBuilder sb = new StringBuilder(string);

        while (sb.length() < totalWidth) {
            sb.append(paddingChar);
        }

        return sb.toString();
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'Remove' (1 parameter version).
    //------------------------------------------------------------------------------------
    public static String remove(String string, int start) {
        return string.substring(0, start);
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'Remove' (2 parameter version).
    //------------------------------------------------------------------------------------
    public static String remove(String string, int start, int count) {
        return string.substring(0, start) + string.substring(start + count);
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string constructor which repeats a character.
    //------------------------------------------------------------------------------------
    public static String repeatChar(char charToRepeat, int count) {
        String newString = "";
        for (int i = 1; i <= count; i++) {
            newString += charToRepeat;
        }
        return newString;
    }

    //------------------------------------------------------------------------------------
    //    This method is used for string equality comparisons when the option
    //    'Use helper 'stringsEqual' method to handle null strings' is selected
    //    (The Java String 'equals' method can't be called on a null instance).
    //------------------------------------------------------------------------------------
    public static boolean stringsEqual(String s1, String s2) {
        if (s1 == null && s2 == null) {
            return true;
        } else {
            return s1 != null && s1.equals(s2);
        }
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'Substring' when 'start' is a method
    //    call or calculated value to ensure that 'start' is obtained just once.
    //------------------------------------------------------------------------------------
    public static String substring(String string, int start, int length) {
        if (length < 0) {
            throw new IndexOutOfBoundsException("Parameter length cannot be negative.");
        }

        return string.substring(start, start + length);
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'Trim' when arguments are used.
    //------------------------------------------------------------------------------------
    public static String trim(String string, Character... charsToTrim) {
        return trimEnd(trimStart(string, charsToTrim), charsToTrim);
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'TrimEnd'.
    //------------------------------------------------------------------------------------
    public static String trimEnd(String string, Character... charsToTrim) {
        if (string == null || charsToTrim == null) {
            return string;
        }

        int lengthToKeep = string.length();
        for (int index = string.length() - 1; index >= 0; index--) {
            boolean removeChar = false;
            if (charsToTrim.length == 0) {
                if (Character.isWhitespace(string.charAt(index))) {
                    lengthToKeep = index;
                    removeChar = true;
                }
            } else {
                for (int trimCharIndex = 0; trimCharIndex < charsToTrim.length; trimCharIndex++) {
                    if (string.charAt(index) == charsToTrim[trimCharIndex]) {
                        lengthToKeep = index;
                        removeChar = true;
                        break;
                    }
                }
            }
            if (!removeChar) {
                break;
            }
        }
        return string.substring(0, lengthToKeep);
    }

    //------------------------------------------------------------------------------------
    //    This method replaces the .NET string method 'TrimStart'.
    //------------------------------------------------------------------------------------
    public static String trimStart(String string, Character... charsToTrim) {
        if (string == null || charsToTrim == null) {
            return string;
        }

        int startingIndex = 0;
        for (int index = 0; index < string.length(); index++) {
            boolean removeChar = false;
            if (charsToTrim.length == 0) {
                if (Character.isWhitespace(string.charAt(index))) {
                    startingIndex = index + 1;
                    removeChar = true;
                }
            } else {
                for (int trimCharIndex = 0; trimCharIndex < charsToTrim.length; trimCharIndex++) {
                    if (string.charAt(index) == charsToTrim[trimCharIndex]) {
                        startingIndex = index + 1;
                        removeChar = true;
                        break;
                    }
                }
            }
            if (!removeChar) {
                break;
            }
        }
        return string.substring(startingIndex);
    }

}