| /* |
| * Copyright (C) 2009-2010, Google Inc. and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.util; |
| |
| import java.text.MessageFormat; |
| import java.util.Collection; |
| |
| import org.eclipse.jgit.internal.JGitText; |
| |
| /** |
| * Miscellaneous string comparison utility methods. |
| */ |
| public final class StringUtils { |
| private static final char[] LC; |
| |
| static { |
| LC = new char['Z' + 1]; |
| for (char c = 0; c < LC.length; c++) |
| LC[c] = c; |
| for (char c = 'A'; c <= 'Z'; c++) |
| LC[c] = (char) ('a' + (c - 'A')); |
| } |
| |
| /** |
| * Convert the input to lowercase. |
| * <p> |
| * This method does not honor the JVM locale, but instead always behaves as |
| * though it is in the US-ASCII locale. Only characters in the range 'A' |
| * through 'Z' are converted. All other characters are left as-is, even if |
| * they otherwise would have a lowercase character equivalent. |
| * |
| * @param c |
| * the input character. |
| * @return lowercase version of the input. |
| */ |
| public static char toLowerCase(char c) { |
| return c <= 'Z' ? LC[c] : c; |
| } |
| |
| /** |
| * Convert the input string to lower case, according to the "C" locale. |
| * <p> |
| * This method does not honor the JVM locale, but instead always behaves as |
| * though it is in the US-ASCII locale. Only characters in the range 'A' |
| * through 'Z' are converted, all other characters are left as-is, even if |
| * they otherwise would have a lowercase character equivalent. |
| * |
| * @param in |
| * the input string. Must not be null. |
| * @return a copy of the input string, after converting characters in the |
| * range 'A'..'Z' to 'a'..'z'. |
| */ |
| public static String toLowerCase(String in) { |
| final StringBuilder r = new StringBuilder(in.length()); |
| for (int i = 0; i < in.length(); i++) |
| r.append(toLowerCase(in.charAt(i))); |
| return r.toString(); |
| } |
| |
| |
| /** |
| * Borrowed from commons-lang <code>StringUtils.capitalize()</code> method. |
| * |
| * <p> |
| * Capitalizes a String changing the first letter to title case as per |
| * {@link java.lang.Character#toTitleCase(char)}. No other letters are |
| * changed. |
| * </p> |
| * <p> |
| * A <code>null</code> input String returns <code>null</code>. |
| * </p> |
| * |
| * @param str |
| * the String to capitalize, may be null |
| * @return the capitalized String, <code>null</code> if null String input |
| * @since 4.0 |
| */ |
| public static String capitalize(String str) { |
| int strLen; |
| if (str == null || (strLen = str.length()) == 0) { |
| return str; |
| } |
| return new StringBuilder(strLen) |
| .append(Character.toTitleCase(str.charAt(0))) |
| .append(str.substring(1)).toString(); |
| } |
| |
| /** |
| * Test if two strings are equal, ignoring case. |
| * <p> |
| * This method does not honor the JVM locale, but instead always behaves as |
| * though it is in the US-ASCII locale. |
| * |
| * @param a |
| * first string to compare. |
| * @param b |
| * second string to compare. |
| * @return true if a equals b |
| */ |
| public static boolean equalsIgnoreCase(String a, String b) { |
| if (References.isSameObject(a, b)) { |
| return true; |
| } |
| if (a.length() != b.length()) |
| return false; |
| for (int i = 0; i < a.length(); i++) { |
| if (toLowerCase(a.charAt(i)) != toLowerCase(b.charAt(i))) |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * Compare two strings, ignoring case. |
| * <p> |
| * This method does not honor the JVM locale, but instead always behaves as |
| * though it is in the US-ASCII locale. |
| * |
| * @param a |
| * first string to compare. |
| * @param b |
| * second string to compare. |
| * @since 2.0 |
| * @return an int. |
| */ |
| public static int compareIgnoreCase(String a, String b) { |
| for (int i = 0; i < a.length() && i < b.length(); i++) { |
| int d = toLowerCase(a.charAt(i)) - toLowerCase(b.charAt(i)); |
| if (d != 0) |
| return d; |
| } |
| return a.length() - b.length(); |
| } |
| |
| /** |
| * Compare two strings, honoring case. |
| * <p> |
| * This method does not honor the JVM locale, but instead always behaves as |
| * though it is in the US-ASCII locale. |
| * |
| * @param a |
| * first string to compare. |
| * @param b |
| * second string to compare. |
| * @since 2.0 |
| * @return an int. |
| */ |
| public static int compareWithCase(String a, String b) { |
| for (int i = 0; i < a.length() && i < b.length(); i++) { |
| int d = a.charAt(i) - b.charAt(i); |
| if (d != 0) |
| return d; |
| } |
| return a.length() - b.length(); |
| } |
| |
| /** |
| * Parse a string as a standard Git boolean value. See |
| * {@link #toBooleanOrNull(String)}. |
| * |
| * @param stringValue |
| * the string to parse. |
| * @return the boolean interpretation of {@code value}. |
| * @throws java.lang.IllegalArgumentException |
| * if {@code value} is not recognized as one of the standard |
| * boolean names. |
| */ |
| public static boolean toBoolean(String stringValue) { |
| if (stringValue == null) |
| throw new NullPointerException(JGitText.get().expectedBooleanStringValue); |
| |
| final Boolean bool = toBooleanOrNull(stringValue); |
| if (bool == null) |
| throw new IllegalArgumentException(MessageFormat.format(JGitText.get().notABoolean, stringValue)); |
| |
| return bool.booleanValue(); |
| } |
| |
| /** |
| * Parse a string as a standard Git boolean value. |
| * <p> |
| * The terms {@code yes}, {@code true}, {@code 1}, {@code on} can all be |
| * used to mean {@code true}. |
| * <p> |
| * The terms {@code no}, {@code false}, {@code 0}, {@code off} can all be |
| * used to mean {@code false}. |
| * <p> |
| * Comparisons ignore case, via {@link #equalsIgnoreCase(String, String)}. |
| * |
| * @param stringValue |
| * the string to parse. |
| * @return the boolean interpretation of {@code value} or null in case the |
| * string does not represent a boolean value |
| */ |
| public static Boolean toBooleanOrNull(String stringValue) { |
| if (stringValue == null) |
| return null; |
| |
| if (equalsIgnoreCase("yes", stringValue) //$NON-NLS-1$ |
| || equalsIgnoreCase("true", stringValue) //$NON-NLS-1$ |
| || equalsIgnoreCase("1", stringValue) //$NON-NLS-1$ |
| || equalsIgnoreCase("on", stringValue)) //$NON-NLS-1$ |
| return Boolean.TRUE; |
| else if (equalsIgnoreCase("no", stringValue) //$NON-NLS-1$ |
| || equalsIgnoreCase("false", stringValue) //$NON-NLS-1$ |
| || equalsIgnoreCase("0", stringValue) //$NON-NLS-1$ |
| || equalsIgnoreCase("off", stringValue)) //$NON-NLS-1$ |
| return Boolean.FALSE; |
| else |
| return null; |
| } |
| |
| /** |
| * Join a collection of Strings together using the specified separator. |
| * |
| * @param parts |
| * Strings to join |
| * @param separator |
| * used to join |
| * @return a String with all the joined parts |
| */ |
| public static String join(Collection<String> parts, String separator) { |
| return StringUtils.join(parts, separator, separator); |
| } |
| |
| /** |
| * Join a collection of Strings together using the specified separator and a |
| * lastSeparator which is used for joining the second last and the last |
| * part. |
| * |
| * @param parts |
| * Strings to join |
| * @param separator |
| * separator used to join all but the two last elements |
| * @param lastSeparator |
| * separator to use for joining the last two elements |
| * @return a String with all the joined parts |
| */ |
| public static String join(Collection<String> parts, String separator, |
| String lastSeparator) { |
| StringBuilder sb = new StringBuilder(); |
| int i = 0; |
| int lastIndex = parts.size() - 1; |
| for (String part : parts) { |
| sb.append(part); |
| if (i == lastIndex - 1) { |
| sb.append(lastSeparator); |
| } else if (i != lastIndex) { |
| sb.append(separator); |
| } |
| i++; |
| } |
| return sb.toString(); |
| } |
| |
| private StringUtils() { |
| // Do not create instances |
| } |
| |
| /** |
| * Test if a string is empty or null. |
| * |
| * @param stringValue |
| * the string to check |
| * @return <code>true</code> if the string is <code>null</code> or empty |
| */ |
| public static boolean isEmptyOrNull(String stringValue) { |
| return stringValue == null || stringValue.length() == 0; |
| } |
| |
| /** |
| * Replace CRLF, CR or LF with a single space. |
| * |
| * @param in |
| * A string with line breaks |
| * @return in without line breaks |
| * @since 3.1 |
| */ |
| public static String replaceLineBreaksWithSpace(String in) { |
| char[] buf = new char[in.length()]; |
| int o = 0; |
| for (int i = 0; i < buf.length; ++i) { |
| char ch = in.charAt(i); |
| switch (ch) { |
| case '\r': |
| if (i + 1 < buf.length && in.charAt(i + 1) == '\n') { |
| buf[o++] = ' '; |
| ++i; |
| } else |
| buf[o++] = ' '; |
| break; |
| case '\n': |
| buf[o++] = ' '; |
| break; |
| default: |
| buf[o++] = ch; |
| break; |
| } |
| } |
| return new String(buf, 0, o); |
| } |
| } |