| /******************************************************************************* |
| * Copyright (c) 2008, 2010 VMware Inc. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * VMware Inc. - initial contribution |
| *******************************************************************************/ |
| |
| package org.eclipse.virgo.bundlor.util; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Properties; |
| import java.util.Set; |
| import java.util.StringTokenizer; |
| import java.util.TreeSet; |
| |
| import org.eclipse.virgo.bundlor.util.CollectionUtils; |
| |
| /** |
| * Miscellaneous {@link String} utility methods. |
| * |
| * <p>Mainly for internal use within the framework; consider |
| * <a href="http://jakarta.apache.org/commons/lang/">Jakarta's Commons Lang</a> |
| * for a more comprehensive suite of String utilities. |
| * |
| * <p>This class delivers some simple functionality that should really |
| * be provided by the core Java <code>String</code> and {@link StringBuilder} |
| * classes, such as the ability to {@link #replace} all occurrences of a given |
| * substring in a target string. It also provides easy-to-use methods to convert |
| * between delimited strings, such as CSV strings, and collections and arrays. |
| * |
| * @author Rod Johnson |
| * @author Juergen Hoeller |
| * @author Keith Donald |
| * @author Rob Harrop |
| * @author Rick Evans |
| * @author Arjen Poutsma |
| * @since 16 April 2001 |
| * @see org.apache.commons.lang.StringUtils |
| */ |
| public abstract class StringUtils { |
| |
| private static final String FOLDER_SEPARATOR = "/"; |
| |
| private static final String WINDOWS_FOLDER_SEPARATOR = "\\"; |
| |
| private static final String TOP_PATH = ".."; |
| |
| private static final String CURRENT_PATH = "."; |
| |
| private static final char EXTENSION_SEPARATOR = '.'; |
| |
| |
| //--------------------------------------------------------------------- |
| // General convenience methods for working with Strings |
| //--------------------------------------------------------------------- |
| |
| /** |
| * Check that the given CharSequence is neither <code>null</code> nor of length 0. |
| * Note: Will return <code>true</code> for a CharSequence that purely consists of whitespace. |
| * <p><pre> |
| * StringUtils.hasLength(null) = false |
| * StringUtils.hasLength("") = false |
| * StringUtils.hasLength(" ") = true |
| * StringUtils.hasLength("Hello") = true |
| * </pre> |
| * @param str the CharSequence to check (may be <code>null</code>) |
| * @return <code>true</code> if the CharSequence is not null and has length |
| * @see #hasText(String) |
| */ |
| public static boolean hasLength(CharSequence str) { |
| return (str != null && str.length() > 0); |
| } |
| |
| /** |
| * Check that the given String is neither <code>null</code> nor of length 0. |
| * Note: Will return <code>true</code> for a String that purely consists of whitespace. |
| * @param str the String to check (may be <code>null</code>) |
| * @return <code>true</code> if the String is not null and has length |
| * @see #hasLength(CharSequence) |
| */ |
| public static boolean hasLength(String str) { |
| return hasLength((CharSequence) str); |
| } |
| |
| /** |
| * Check whether the given CharSequence has actual text. |
| * More specifically, returns <code>true</code> if the string not <code>null</code>, |
| * its length is greater than 0, and it contains at least one non-whitespace character. |
| * <p><pre> |
| * StringUtils.hasText(null) = false |
| * StringUtils.hasText("") = false |
| * StringUtils.hasText(" ") = false |
| * StringUtils.hasText("12345") = true |
| * StringUtils.hasText(" 12345 ") = true |
| * </pre> |
| * @param str the CharSequence to check (may be <code>null</code>) |
| * @return <code>true</code> if the CharSequence is not <code>null</code>, |
| * its length is greater than 0, and it does not contain whitespace only |
| * @see java.lang.Character#isWhitespace |
| */ |
| public static boolean hasText(CharSequence str) { |
| if (!hasLength(str)) { |
| return false; |
| } |
| int strLen = str.length(); |
| for (int i = 0; i < strLen; i++) { |
| if (!Character.isWhitespace(str.charAt(i))) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Check whether the given String has actual text. |
| * More specifically, returns <code>true</code> if the string not <code>null</code>, |
| * its length is greater than 0, and it contains at least one non-whitespace character. |
| * @param str the String to check (may be <code>null</code>) |
| * @return <code>true</code> if the String is not <code>null</code>, its length is |
| * greater than 0, and it does not contain whitespace only |
| * @see #hasText(CharSequence) |
| */ |
| public static boolean hasText(String str) { |
| return hasText((CharSequence) str); |
| } |
| |
| /** |
| * Check whether the given CharSequence contains any whitespace characters. |
| * @param str the CharSequence to check (may be <code>null</code>) |
| * @return <code>true</code> if the CharSequence is not empty and |
| * contains at least 1 whitespace character |
| * @see java.lang.Character#isWhitespace |
| */ |
| public static boolean containsWhitespace(CharSequence str) { |
| if (!hasLength(str)) { |
| return false; |
| } |
| int strLen = str.length(); |
| for (int i = 0; i < strLen; i++) { |
| if (Character.isWhitespace(str.charAt(i))) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Check whether the given String contains any whitespace characters. |
| * @param str the String to check (may be <code>null</code>) |
| * @return <code>true</code> if the String is not empty and |
| * contains at least 1 whitespace character |
| * @see #containsWhitespace(CharSequence) |
| */ |
| public static boolean containsWhitespace(String str) { |
| return containsWhitespace((CharSequence) str); |
| } |
| |
| /** |
| * Trim leading and trailing whitespace from the given String. |
| * @param str the String to check |
| * @return the trimmed String |
| * @see java.lang.Character#isWhitespace |
| */ |
| public static String trimWhitespace(String str) { |
| if (!hasLength(str)) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str); |
| while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) { |
| sb.deleteCharAt(0); |
| } |
| while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) { |
| sb.deleteCharAt(sb.length() - 1); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Trim <i>all</i> whitespace from the given String: |
| * leading, trailing, and inbetween characters. |
| * @param str the String to check |
| * @return the trimmed String |
| * @see java.lang.Character#isWhitespace |
| */ |
| public static String trimAllWhitespace(String str) { |
| if (!hasLength(str)) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str); |
| int index = 0; |
| while (sb.length() > index) { |
| if (Character.isWhitespace(sb.charAt(index))) { |
| sb.deleteCharAt(index); |
| } |
| else { |
| index++; |
| } |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Trim leading whitespace from the given String. |
| * @param str the String to check |
| * @return the trimmed String |
| * @see java.lang.Character#isWhitespace |
| */ |
| public static String trimLeadingWhitespace(String str) { |
| if (!hasLength(str)) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str); |
| while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) { |
| sb.deleteCharAt(0); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Trim trailing whitespace from the given String. |
| * @param str the String to check |
| * @return the trimmed String |
| * @see java.lang.Character#isWhitespace |
| */ |
| public static String trimTrailingWhitespace(String str) { |
| if (!hasLength(str)) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str); |
| while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) { |
| sb.deleteCharAt(sb.length() - 1); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Trim all occurences of the supplied leading character from the given String. |
| * @param str the String to check |
| * @param leadingCharacter the leading character to be trimmed |
| * @return the trimmed String |
| */ |
| public static String trimLeadingCharacter(String str, char leadingCharacter) { |
| if (!hasLength(str)) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str); |
| while (sb.length() > 0 && sb.charAt(0) == leadingCharacter) { |
| sb.deleteCharAt(0); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Trim all occurences of the supplied trailing character from the given String. |
| * @param str the String to check |
| * @param trailingCharacter the trailing character to be trimmed |
| * @return the trimmed String |
| */ |
| public static String trimTrailingCharacter(String str, char trailingCharacter) { |
| if (!hasLength(str)) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str); |
| while (sb.length() > 0 && sb.charAt(sb.length() - 1) == trailingCharacter) { |
| sb.deleteCharAt(sb.length() - 1); |
| } |
| return sb.toString(); |
| } |
| |
| |
| /** |
| * Test if the given String starts with the specified prefix, |
| * ignoring upper/lower case. |
| * @param str the String to check |
| * @param prefix the prefix to look for |
| * @see java.lang.String#startsWith |
| */ |
| public static boolean startsWithIgnoreCase(String str, String prefix) { |
| if (str == null || prefix == null) { |
| return false; |
| } |
| if (str.startsWith(prefix)) { |
| return true; |
| } |
| if (str.length() < prefix.length()) { |
| return false; |
| } |
| String lcStr = str.substring(0, prefix.length()).toLowerCase(); |
| String lcPrefix = prefix.toLowerCase(); |
| return lcStr.equals(lcPrefix); |
| } |
| |
| /** |
| * Test if the given String ends with the specified suffix, |
| * ignoring upper/lower case. |
| * @param str the String to check |
| * @param suffix the suffix to look for |
| * @see java.lang.String#endsWith |
| */ |
| public static boolean endsWithIgnoreCase(String str, String suffix) { |
| if (str == null || suffix == null) { |
| return false; |
| } |
| if (str.endsWith(suffix)) { |
| return true; |
| } |
| if (str.length() < suffix.length()) { |
| return false; |
| } |
| |
| String lcStr = str.substring(str.length() - suffix.length()).toLowerCase(); |
| String lcSuffix = suffix.toLowerCase(); |
| return lcStr.equals(lcSuffix); |
| } |
| |
| /** |
| * Test whether the given string matches the given substring |
| * at the given index. |
| * @param str the original string (or StringBuilder) |
| * @param index the index in the original string to start matching against |
| * @param substring the substring to match at the given index |
| */ |
| public static boolean substringMatch(CharSequence str, int index, CharSequence substring) { |
| for (int j = 0; j < substring.length(); j++) { |
| int i = index + j; |
| if (i >= str.length() || str.charAt(i) != substring.charAt(j)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Count the occurrences of the substring in string s. |
| * @param str string to search in. Return 0 if this is null. |
| * @param sub string to search for. Return 0 if this is null. |
| */ |
| public static int countOccurrencesOf(String str, String sub) { |
| if (str == null || sub == null || str.length() == 0 || sub.length() == 0) { |
| return 0; |
| } |
| int count = 0; |
| int pos = 0; |
| int idx; |
| while ((idx = str.indexOf(sub, pos)) != -1) { |
| ++count; |
| pos = idx + sub.length(); |
| } |
| return count; |
| } |
| |
| /** |
| * Replace all occurences of a substring within a string with |
| * another string. |
| * @param inString String to examine |
| * @param oldPattern String to replace |
| * @param newPattern String to insert |
| * @return a String with the replacements |
| */ |
| public static String replace(String inString, String oldPattern, String newPattern) { |
| if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) { |
| return inString; |
| } |
| StringBuilder sb = new StringBuilder(); |
| int pos = 0; // our position in the old string |
| int index = inString.indexOf(oldPattern); |
| // the index of an occurrence we've found, or -1 |
| int patLen = oldPattern.length(); |
| while (index >= 0) { |
| sb.append(inString.substring(pos, index)); |
| sb.append(newPattern); |
| pos = index + patLen; |
| index = inString.indexOf(oldPattern, pos); |
| } |
| sb.append(inString.substring(pos)); |
| // remember to append any characters to the right of a match |
| return sb.toString(); |
| } |
| |
| /** |
| * Delete all occurrences of the given substring. |
| * @param inString the original String |
| * @param pattern the pattern to delete all occurrences of |
| * @return the resulting String |
| */ |
| public static String delete(String inString, String pattern) { |
| return replace(inString, pattern, ""); |
| } |
| |
| /** |
| * Delete any character in a given String. |
| * @param inString the original String |
| * @param charsToDelete a set of characters to delete. |
| * E.g. "az\n" will delete 'a's, 'z's and new lines. |
| * @return the resulting String |
| */ |
| public static String deleteAny(String inString, String charsToDelete) { |
| if (!hasLength(inString) || !hasLength(charsToDelete)) { |
| return inString; |
| } |
| StringBuilder sb = new StringBuilder(); |
| for (int i = 0; i < inString.length(); i++) { |
| char c = inString.charAt(i); |
| if (charsToDelete.indexOf(c) == -1) { |
| sb.append(c); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| |
| //--------------------------------------------------------------------- |
| // Convenience methods for working with formatted Strings |
| //--------------------------------------------------------------------- |
| |
| /** |
| * Quote the given String with single quotes. |
| * @param str the input String (e.g. "myString") |
| * @return the quoted String (e.g. "'myString'"), |
| * or <code>null<code> if the input was <code>null</code> |
| */ |
| public static String quote(String str) { |
| return (str != null ? "'" + str + "'" : null); |
| } |
| |
| /** |
| * Turn the given Object into a String with single quotes |
| * if it is a String; keeping the Object as-is else. |
| * @param obj the input Object (e.g. "myString") |
| * @return the quoted String (e.g. "'myString'"), |
| * or the input object as-is if not a String |
| */ |
| public static Object quoteIfString(Object obj) { |
| return (obj instanceof String ? quote((String) obj) : obj); |
| } |
| |
| /** |
| * Unqualify a string qualified by a '.' dot character. For example, |
| * "this.name.is.qualified", returns "qualified". |
| * @param qualifiedName the qualified name |
| */ |
| public static String unqualify(String qualifiedName) { |
| return unqualify(qualifiedName, '.'); |
| } |
| |
| /** |
| * Unqualify a string qualified by a separator character. For example, |
| * "this:name:is:qualified" returns "qualified" if using a ':' separator. |
| * @param qualifiedName the qualified name |
| * @param separator the separator |
| */ |
| public static String unqualify(String qualifiedName, char separator) { |
| return qualifiedName.substring(qualifiedName.lastIndexOf(separator) + 1); |
| } |
| |
| /** |
| * Capitalize a <code>String</code>, changing the first letter to |
| * upper case as per {@link Character#toUpperCase(char)}. |
| * No other letters are changed. |
| * @param str the String to capitalize, may be <code>null</code> |
| * @return the capitalized String, <code>null</code> if null |
| */ |
| public static String capitalize(String str) { |
| return changeFirstCharacterCase(str, true); |
| } |
| |
| /** |
| * Uncapitalize a <code>String</code>, changing the first letter to |
| * lower case as per {@link Character#toLowerCase(char)}. |
| * No other letters are changed. |
| * @param str the String to uncapitalize, may be <code>null</code> |
| * @return the uncapitalized String, <code>null</code> if null |
| */ |
| public static String uncapitalize(String str) { |
| return changeFirstCharacterCase(str, false); |
| } |
| |
| private static String changeFirstCharacterCase(String str, boolean capitalize) { |
| if (str == null || str.length() == 0) { |
| return str; |
| } |
| StringBuilder sb = new StringBuilder(str.length()); |
| if (capitalize) { |
| sb.append(Character.toUpperCase(str.charAt(0))); |
| } |
| else { |
| sb.append(Character.toLowerCase(str.charAt(0))); |
| } |
| sb.append(str.substring(1)); |
| return sb.toString(); |
| } |
| |
| /** |
| * Extract the filename from the given path, |
| * e.g. "mypath/myfile.txt" -> "myfile.txt". |
| * @param path the file path (may be <code>null</code>) |
| * @return the extracted filename, or <code>null</code> if none |
| */ |
| public static String getFilename(String path) { |
| if (path == null) { |
| return null; |
| } |
| int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR); |
| return (separatorIndex != -1 ? path.substring(separatorIndex + 1) : path); |
| } |
| |
| /** |
| * Extract the filename extension from the given path, |
| * e.g. "mypath/myfile.txt" -> "txt". |
| * @param path the file path (may be <code>null</code>) |
| * @return the extracted filename extension, or <code>null</code> if none |
| */ |
| public static String getFilenameExtension(String path) { |
| if (path == null) { |
| return null; |
| } |
| int sepIndex = path.lastIndexOf(EXTENSION_SEPARATOR); |
| return (sepIndex != -1 ? path.substring(sepIndex + 1) : null); |
| } |
| |
| /** |
| * Strip the filename extension from the given path, |
| * e.g. "mypath/myfile.txt" -> "mypath/myfile". |
| * @param path the file path (may be <code>null</code>) |
| * @return the path with stripped filename extension, |
| * or <code>null</code> if none |
| */ |
| public static String stripFilenameExtension(String path) { |
| if (path == null) { |
| return null; |
| } |
| int sepIndex = path.lastIndexOf(EXTENSION_SEPARATOR); |
| return (sepIndex != -1 ? path.substring(0, sepIndex) : path); |
| } |
| |
| /** |
| * Apply the given relative path to the given path, |
| * assuming standard Java folder separation (i.e. "/" separators); |
| * @param path the path to start from (usually a full file path) |
| * @param relativePath the relative path to apply |
| * (relative to the full file path above) |
| * @return the full file path that results from applying the relative path |
| */ |
| public static String applyRelativePath(String path, String relativePath) { |
| int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR); |
| if (separatorIndex != -1) { |
| String newPath = path.substring(0, separatorIndex); |
| if (!relativePath.startsWith(FOLDER_SEPARATOR)) { |
| newPath += FOLDER_SEPARATOR; |
| } |
| return newPath + relativePath; |
| } |
| else { |
| return relativePath; |
| } |
| } |
| |
| /** |
| * Normalize the path by suppressing sequences like "path/.." and |
| * inner simple dots. |
| * <p>The result is convenient for path comparison. For other uses, |
| * notice that Windows separators ("\") are replaced by simple slashes. |
| * @param path the original path |
| * @return the normalized path |
| */ |
| public static String cleanPath(String path) { |
| if (path == null) { |
| return null; |
| } |
| String pathToUse = replace(path, WINDOWS_FOLDER_SEPARATOR, FOLDER_SEPARATOR); |
| |
| // Strip prefix from path to analyze, to not treat it as part of the |
| // first path element. This is necessary to correctly parse paths like |
| // "file:core/../core/io/Resource.class", where the ".." should just |
| // strip the first "core" directory while keeping the "file:" prefix. |
| int prefixIndex = pathToUse.indexOf(":"); |
| String prefix = ""; |
| if (prefixIndex != -1) { |
| prefix = pathToUse.substring(0, prefixIndex + 1); |
| pathToUse = pathToUse.substring(prefixIndex + 1); |
| } |
| if (pathToUse.startsWith(FOLDER_SEPARATOR)) { |
| prefix = prefix + FOLDER_SEPARATOR; |
| pathToUse = pathToUse.substring(1); |
| } |
| |
| String[] pathArray = delimitedListToStringArray(pathToUse, FOLDER_SEPARATOR); |
| List<String> pathElements = new LinkedList<String>(); |
| int tops = 0; |
| |
| for (int i = pathArray.length - 1; i >= 0; i--) { |
| String element = pathArray[i]; |
| if (CURRENT_PATH.equals(element)) { |
| // Points to current directory - drop it. |
| } |
| else if (TOP_PATH.equals(element)) { |
| // Registering top path found. |
| tops++; |
| } |
| else { |
| if (tops > 0) { |
| // Merging path element with element corresponding to top path. |
| tops--; |
| } |
| else { |
| // Normal path element found. |
| pathElements.add(0, element); |
| } |
| } |
| } |
| |
| // Remaining top paths need to be retained. |
| for (int i = 0; i < tops; i++) { |
| pathElements.add(0, TOP_PATH); |
| } |
| |
| return prefix + collectionToDelimitedString(pathElements, FOLDER_SEPARATOR); |
| } |
| |
| /** |
| * Compare two paths after normalization of them. |
| * @param path1 first path for comparison |
| * @param path2 second path for comparison |
| * @return whether the two paths are equivalent after normalization |
| */ |
| public static boolean pathEquals(String path1, String path2) { |
| return cleanPath(path1).equals(cleanPath(path2)); |
| } |
| |
| /** |
| * Parse the given <code>localeString</code> into a {@link Locale}. |
| * <p>This is the inverse operation of {@link Locale#toString Locale's toString}. |
| * @param localeString the locale string, following <code>Locale's</code> |
| * <code>toString()</code> format ("en", "en_UK", etc); |
| * also accepts spaces as separators, as an alternative to underscores |
| * @return a corresponding <code>Locale</code> instance |
| */ |
| public static Locale parseLocaleString(String localeString) { |
| String[] parts = tokenizeToStringArray(localeString, "_ ", false, false); |
| String language = (parts.length > 0 ? parts[0] : ""); |
| String country = (parts.length > 1 ? parts[1] : ""); |
| String variant = ""; |
| if (parts.length >= 2) { |
| // There is definitely a variant, and it is everything after the country |
| // code sans the separator between the country code and the variant. |
| int endIndexOfCountryCode = localeString.indexOf(country) + country.length(); |
| // Strip off any leading '_' and whitespace, what's left is the variant. |
| variant = trimLeadingWhitespace(localeString.substring(endIndexOfCountryCode)); |
| if (variant.startsWith("_")) { |
| variant = trimLeadingCharacter(variant, '_'); |
| } |
| } |
| return (language.length() > 0 ? new Locale(language, country, variant) : null); |
| } |
| |
| /** |
| * Determine the RFC 3066 compliant language tag, |
| * as used for the HTTP "Accept-Language" header. |
| * @param locale the Locale to transform to a language tag |
| * @return the RFC 3066 compliant language tag as String |
| */ |
| public static String toLanguageTag(Locale locale) { |
| return locale.getLanguage() + (hasText(locale.getCountry()) ? "-" + locale.getCountry() : ""); |
| } |
| |
| |
| //--------------------------------------------------------------------- |
| // Convenience methods for working with String arrays |
| //--------------------------------------------------------------------- |
| |
| /** |
| * Append the given String to the given String array, returning a new array |
| * consisting of the input array contents plus the given String. |
| * @param array the array to append to (can be <code>null</code>) |
| * @param str the String to append |
| * @return the new array (never <code>null</code>) |
| */ |
| public static String[] addStringToArray(String[] array, String str) { |
| if (ObjectUtils.isEmpty(array)) { |
| return new String[] {str}; |
| } |
| String[] newArr = new String[array.length + 1]; |
| System.arraycopy(array, 0, newArr, 0, array.length); |
| newArr[array.length] = str; |
| return newArr; |
| } |
| |
| /** |
| * Concatenate the given String arrays into one, |
| * with overlapping array elements included twice. |
| * <p>The order of elements in the original arrays is preserved. |
| * @param array1 the first array (can be <code>null</code>) |
| * @param array2 the second array (can be <code>null</code>) |
| * @return the new array (<code>null</code> if both given arrays were <code>null</code>) |
| */ |
| public static String[] concatenateStringArrays(String[] array1, String[] array2) { |
| if (ObjectUtils.isEmpty(array1)) { |
| return array2; |
| } |
| if (ObjectUtils.isEmpty(array2)) { |
| return array1; |
| } |
| String[] newArr = new String[array1.length + array2.length]; |
| System.arraycopy(array1, 0, newArr, 0, array1.length); |
| System.arraycopy(array2, 0, newArr, array1.length, array2.length); |
| return newArr; |
| } |
| |
| /** |
| * Merge the given String arrays into one, with overlapping |
| * array elements only included once. |
| * <p>The order of elements in the original arrays is preserved |
| * (with the exception of overlapping elements, which are only |
| * included on their first occurence). |
| * @param array1 the first array (can be <code>null</code>) |
| * @param array2 the second array (can be <code>null</code>) |
| * @return the new array (<code>null</code> if both given arrays were <code>null</code>) |
| */ |
| public static String[] mergeStringArrays(String[] array1, String[] array2) { |
| if (ObjectUtils.isEmpty(array1)) { |
| return array2; |
| } |
| if (ObjectUtils.isEmpty(array2)) { |
| return array1; |
| } |
| List<String> result = new ArrayList<String>(); |
| result.addAll(Arrays.asList(array1)); |
| for (String str : array2) { |
| if (!result.contains(str)) { |
| result.add(str); |
| } |
| } |
| return toStringArray(result); |
| } |
| |
| /** |
| * Turn given source String array into sorted array. |
| * @param array the source array |
| * @return the sorted array (never <code>null</code>) |
| */ |
| public static String[] sortStringArray(String[] array) { |
| if (ObjectUtils.isEmpty(array)) { |
| return new String[0]; |
| } |
| Arrays.sort(array); |
| return array; |
| } |
| |
| /** |
| * Copy the given Collection into a String array. |
| * The Collection must contain String elements only. |
| * @param collection the Collection to copy |
| * @return the String array (<code>null</code> if the passed-in |
| * Collection was <code>null</code>) |
| */ |
| public static String[] toStringArray(Collection<String> collection) { |
| if (collection == null) { |
| return null; |
| } |
| return collection.toArray(new String[collection.size()]); |
| } |
| |
| /** |
| * Copy the given Enumeration into a String array. |
| * The Enumeration must contain String elements only. |
| * @param enumeration the Enumeration to copy |
| * @return the String array (<code>null</code> if the passed-in |
| * Enumeration was <code>null</code>) |
| */ |
| public static String[] toStringArray(Enumeration<String> enumeration) { |
| if (enumeration == null) { |
| return null; |
| } |
| List<String> list = Collections.list(enumeration); |
| return list.toArray(new String[list.size()]); |
| } |
| |
| /** |
| * Trim the elements of the given String array, |
| * calling <code>String.trim()</code> on each of them. |
| * @param array the original String array |
| * @return the resulting array (of the same size) with trimmed elements |
| */ |
| public static String[] trimArrayElements(String[] array) { |
| if (ObjectUtils.isEmpty(array)) { |
| return new String[0]; |
| } |
| String[] result = new String[array.length]; |
| for (int i = 0; i < array.length; i++) { |
| String element = array[i]; |
| result[i] = (element != null ? element.trim() : null); |
| } |
| return result; |
| } |
| |
| /** |
| * Remove duplicate Strings from the given array. |
| * Also sorts the array, as it uses a TreeSet. |
| * @param array the String array |
| * @return an array without duplicates, in natural sort order |
| */ |
| public static String[] removeDuplicateStrings(String[] array) { |
| if (ObjectUtils.isEmpty(array)) { |
| return array; |
| } |
| Set<String> set = new TreeSet<String>(); |
| for (String element : array) { |
| set.add(element); |
| } |
| return toStringArray(set); |
| } |
| |
| /** |
| * Split a String at the first occurrence of the delimiter. |
| * Does not include the delimiter in the result. |
| * @param toSplit the string to split |
| * @param delimiter to split the string up with |
| * @return a two element array with index 0 being before the delimiter, and |
| * index 1 being after the delimiter (neither element includes the delimiter); |
| * or <code>null</code> if the delimiter wasn't found in the given input String |
| */ |
| public static String[] split(String toSplit, String delimiter) { |
| if (!hasLength(toSplit) || !hasLength(delimiter)) { |
| return null; |
| } |
| int offset = toSplit.indexOf(delimiter); |
| if (offset < 0) { |
| return null; |
| } |
| String beforeDelimiter = toSplit.substring(0, offset); |
| String afterDelimiter = toSplit.substring(offset + delimiter.length()); |
| return new String[] {beforeDelimiter, afterDelimiter}; |
| } |
| |
| /** |
| * Take an array Strings and split each element based on the given delimiter. |
| * A <code>Properties</code> instance is then generated, with the left of the |
| * delimiter providing the key, and the right of the delimiter providing the value. |
| * <p>Will trim both the key and value before adding them to the |
| * <code>Properties</code> instance. |
| * @param array the array to process |
| * @param delimiter to split each element using (typically the equals symbol) |
| * @return a <code>Properties</code> instance representing the array contents, |
| * or <code>null</code> if the array to process was null or empty |
| */ |
| public static Properties splitArrayElementsIntoProperties(String[] array, String delimiter) { |
| return splitArrayElementsIntoProperties(array, delimiter, null); |
| } |
| |
| /** |
| * Take an array Strings and split each element based on the given delimiter. |
| * A <code>Properties</code> instance is then generated, with the left of the |
| * delimiter providing the key, and the right of the delimiter providing the value. |
| * <p>Will trim both the key and value before adding them to the |
| * <code>Properties</code> instance. |
| * @param array the array to process |
| * @param delimiter to split each element using (typically the equals symbol) |
| * @param charsToDelete one or more characters to remove from each element |
| * prior to attempting the split operation (typically the quotation mark |
| * symbol), or <code>null</code> if no removal should occur |
| * @return a <code>Properties</code> instance representing the array contents, |
| * or <code>null</code> if the array to process was <code>null</code> or empty |
| */ |
| public static Properties splitArrayElementsIntoProperties( |
| String[] array, String delimiter, String charsToDelete) { |
| |
| if (ObjectUtils.isEmpty(array)) { |
| return null; |
| } |
| Properties result = new Properties(); |
| for (String element : array) { |
| if (charsToDelete != null) { |
| element = deleteAny(element, charsToDelete); |
| } |
| String[] splittedElement = split(element, delimiter); |
| if (splittedElement == null) { |
| continue; |
| } |
| result.setProperty(splittedElement[0].trim(), splittedElement[1].trim()); |
| } |
| return result; |
| } |
| |
| /** |
| * Tokenize the given String into a String array via a StringTokenizer. |
| * Trims tokens and omits empty tokens. |
| * <p>The given delimiters string is supposed to consist of any number of |
| * delimiter characters. Each of those characters can be used to separate |
| * tokens. A delimiter is always a single character; for multi-character |
| * delimiters, consider using <code>delimitedListToStringArray</code> |
| * @param str the String to tokenize |
| * @param delimiters the delimiter characters, assembled as String |
| * (each of those characters is individually considered as delimiter). |
| * @return an array of the tokens |
| * @see java.util.StringTokenizer |
| * @see java.lang.String#trim() |
| * @see #delimitedListToStringArray |
| */ |
| public static String[] tokenizeToStringArray(String str, String delimiters) { |
| return tokenizeToStringArray(str, delimiters, true, true); |
| } |
| |
| /** |
| * Tokenize the given String into a String array via a StringTokenizer. |
| * <p>The given delimiters string is supposed to consist of any number of |
| * delimiter characters. Each of those characters can be used to separate |
| * tokens. A delimiter is always a single character; for multi-character |
| * delimiters, consider using <code>delimitedListToStringArray</code> |
| * @param str the String to tokenize |
| * @param delimiters the delimiter characters, assembled as String |
| * (each of those characters is individually considered as delimiter) |
| * @param trimTokens trim the tokens via String's <code>trim</code> |
| * @param ignoreEmptyTokens omit empty tokens from the result array |
| * (only applies to tokens that are empty after trimming; StringTokenizer |
| * will not consider subsequent delimiters as token in the first place). |
| * @return an array of the tokens (<code>null</code> if the input String |
| * was <code>null</code>) |
| * @see java.util.StringTokenizer |
| * @see java.lang.String#trim() |
| * @see #delimitedListToStringArray |
| */ |
| public static String[] tokenizeToStringArray( |
| String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) { |
| |
| if (str == null) { |
| return null; |
| } |
| StringTokenizer st = new StringTokenizer(str, delimiters); |
| List<String> tokens = new ArrayList<String>(); |
| while (st.hasMoreTokens()) { |
| String token = st.nextToken(); |
| if (trimTokens) { |
| token = token.trim(); |
| } |
| if (!ignoreEmptyTokens || token.length() > 0) { |
| tokens.add(token); |
| } |
| } |
| return toStringArray(tokens); |
| } |
| |
| /** |
| * Take a String which is a delimited list and convert it to a String array. |
| * <p>A single delimiter can consists of more than one character: It will still |
| * be considered as single delimiter string, rather than as bunch of potential |
| * delimiter characters - in contrast to <code>tokenizeToStringArray</code>. |
| * @param str the input String |
| * @param delimiter the delimiter between elements (this is a single delimiter, |
| * rather than a bunch individual delimiter characters) |
| * @return an array of the tokens in the list |
| * @see #tokenizeToStringArray |
| */ |
| public static String[] delimitedListToStringArray(String str, String delimiter) { |
| return delimitedListToStringArray(str, delimiter, null); |
| } |
| |
| /** |
| * Take a String which is a delimited list and convert it to a String array. |
| * <p>A single delimiter can consists of more than one character: It will still |
| * be considered as single delimiter string, rather than as bunch of potential |
| * delimiter characters - in contrast to <code>tokenizeToStringArray</code>. |
| * @param str the input String |
| * @param delimiter the delimiter between elements (this is a single delimiter, |
| * rather than a bunch individual delimiter characters) |
| * @param charsToDelete a set of characters to delete. Useful for deleting unwanted |
| * line breaks: e.g. "\r\n\f" will delete all new lines and line feeds in a String. |
| * @return an array of the tokens in the list |
| * @see #tokenizeToStringArray |
| */ |
| public static String[] delimitedListToStringArray(String str, String delimiter, String charsToDelete) { |
| if (str == null) { |
| return new String[0]; |
| } |
| if (delimiter == null) { |
| return new String[] {str}; |
| } |
| List<String> result = new ArrayList<String>(); |
| if ("".equals(delimiter)) { |
| for (int i = 0; i < str.length(); i++) { |
| result.add(deleteAny(str.substring(i, i + 1), charsToDelete)); |
| } |
| } |
| else { |
| int pos = 0; |
| int delPos; |
| while ((delPos = str.indexOf(delimiter, pos)) != -1) { |
| result.add(deleteAny(str.substring(pos, delPos), charsToDelete)); |
| pos = delPos + delimiter.length(); |
| } |
| if (str.length() > 0 && pos <= str.length()) { |
| // Add rest of String, but not in case of empty input. |
| result.add(deleteAny(str.substring(pos), charsToDelete)); |
| } |
| } |
| return toStringArray(result); |
| } |
| |
| /** |
| * Convert a CSV list into an array of Strings. |
| * @param str the input String |
| * @return an array of Strings, or the empty array in case of empty input |
| */ |
| public static String[] commaDelimitedListToStringArray(String str) { |
| return delimitedListToStringArray(str, ","); |
| } |
| |
| /** |
| * Convenience method to convert a CSV string list to a set. |
| * Note that this will suppress duplicates. |
| * @param str the input String |
| * @return a Set of String entries in the list |
| */ |
| public static Set<String> commaDelimitedListToSet(String str) { |
| Set<String> set = new TreeSet<String>(); |
| String[] tokens = commaDelimitedListToStringArray(str); |
| for (String token : tokens) { |
| set.add(token); |
| } |
| return set; |
| } |
| |
| /** |
| * Convenience method to return a Collection as a delimited (e.g. CSV) |
| * String. E.g. useful for <code>toString()</code> implementations. |
| * @param coll the Collection to display |
| * @param delim the delimiter to use (probably a ",") |
| * @param prefix the String to start each element with |
| * @param suffix the String to end each element with |
| * @return the delimited String |
| */ |
| public static String collectionToDelimitedString(Collection<?> coll, String delim, String prefix, String suffix) { |
| if (CollectionUtils.isEmpty(coll)) { |
| return ""; |
| } |
| StringBuilder sb = new StringBuilder(); |
| Iterator<?> it = coll.iterator(); |
| while (it.hasNext()) { |
| sb.append(prefix).append(it.next()).append(suffix); |
| if (it.hasNext()) { |
| sb.append(delim); |
| } |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Convenience method to return a Collection as a delimited (e.g. CSV) |
| * String. E.g. useful for <code>toString()</code> implementations. |
| * @param coll the Collection to display |
| * @param delim the delimiter to use (probably a ",") |
| * @return the delimited String |
| */ |
| public static String collectionToDelimitedString(Collection<?> coll, String delim) { |
| return collectionToDelimitedString(coll, delim, "", ""); |
| } |
| |
| /** |
| * Convenience method to return a Collection as a CSV String. |
| * E.g. useful for <code>toString()</code> implementations. |
| * @param coll the Collection to display |
| * @return the delimited String |
| */ |
| public static String collectionToCommaDelimitedString(Collection<?> coll) { |
| return collectionToDelimitedString(coll, ","); |
| } |
| |
| /** |
| * Convenience method to return a String array as a delimited (e.g. CSV) |
| * String. E.g. useful for <code>toString()</code> implementations. |
| * @param arr the array to display |
| * @param delim the delimiter to use (probably a ",") |
| * @return the delimited String |
| */ |
| public static String arrayToDelimitedString(Object[] arr, String delim) { |
| if (ObjectUtils.isEmpty(arr)) { |
| return ""; |
| } |
| if (arr.length == 1) { |
| return ObjectUtils.nullSafeToString(arr[0]); |
| } |
| StringBuilder sb = new StringBuilder(); |
| for (int i = 0; i < arr.length; i++) { |
| if (i > 0) { |
| sb.append(delim); |
| } |
| sb.append(arr[i]); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Convenience method to return a String array as a CSV String. |
| * E.g. useful for <code>toString()</code> implementations. |
| * @param arr the array to display |
| * @return the delimited String |
| */ |
| public static String arrayToCommaDelimitedString(Object[] arr) { |
| return arrayToDelimitedString(arr, ","); |
| } |
| |
| } |