| /******************************************************************************* |
| * Copyright (c) 2000, 2003 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.core.util; |
| |
| /** |
| * A class to do characters operations so that we can use |
| * char arrays more effectively. |
| */ |
| public class CharArrayOps { |
| /** |
| * Returns the char arrays as an array of Strings |
| */ |
| public static String[] charcharToString(char[][] charchar) { |
| if (charchar == null) { |
| return null; |
| } |
| String[] strings= new String[charchar.length]; |
| for (int i= 0; i < charchar.length; i++) { |
| strings[i]= new String(charchar[i]); |
| } |
| return strings; |
| } |
| /** |
| * Returns the char array as a String |
| */ |
| public static String charToString(char[] chars) { |
| if (chars == null) { |
| return null; |
| } else { |
| return new String(chars); |
| } |
| } |
| /** |
| * Concatinates the two arrays into one big array. |
| * If the first array is null, returns the second array. |
| * If the second array is null, returns the first array. |
| * |
| * @param first - the array which the other array is concatinated onto |
| * @param second - the array which is to be concatinated onto the first array |
| */ |
| public static char[] concat(char[] first, char[] second) { |
| if (first == null) |
| return second; |
| if (second == null) |
| return first; |
| |
| int length1 = first.length; |
| int length2 = second.length; |
| char[] result = new char[length1 + length2]; |
| System.arraycopy(first, 0, result, 0, length1); |
| System.arraycopy(second, 0, result, length1, length2); |
| return result; |
| } |
| /** |
| * Checks the two character arrays for equality. |
| * |
| * @param first - one of the arrays to be compared |
| * @param second - the other array which is to be compared |
| */ |
| public static boolean equals(char[] first, char[] second) { |
| if (first == second) |
| return true; |
| if (first == null || second == null) |
| return false; |
| if (first.length != second.length) |
| return false; |
| |
| for (int i = 0, length = first.length; i < length; i++) |
| if (first[i] != second[i]) |
| return false; |
| return true; |
| } |
| /** |
| * Returns the index of the first occurrence of character in buffer, |
| * starting from offset, or -1 if not found. |
| */ |
| public static int indexOf(char character, char[] buffer, int offset) { |
| for (int i= offset; i < buffer.length; i++) { |
| if (buffer[i] == character) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| /** |
| * Extracts a sub-array from the given array, starting |
| * at the given startIndex and proceeding for length characters. |
| * Returns null if: |
| * 1. the src array is null |
| * 2. the start index is out of bounds |
| * 3. the length parameter specifies a end point which is out of bounds |
| * Does not return a copy of the array if possible, i.e. if start is zero |
| * and length equals the length of the src array. |
| * |
| * @param src - the array from which elements need to be copied |
| * @param start - the start index in the src array |
| * @param length - the number of characters to copy |
| */ |
| public static char[] subarray(char[] src, int start, int length) { |
| if (src == null) |
| return null; |
| int srcLength = src.length; |
| if (start < 0 || start >= srcLength) |
| return null; |
| if (length < 0 || start + length > srcLength) |
| return null; |
| if (srcLength == length && start == 0) |
| return src; |
| |
| char[] result = new char[length]; |
| if (length > 0) |
| System.arraycopy(src, start, result, 0, length); |
| return result; |
| } |
| /** |
| * Extracts a substring from the given array, starting |
| * at the given startIndex and proceeding for length characters. |
| * Returns null if: |
| * 1. the src array is null |
| * 2. the start index is out of bounds |
| * 3. the length parameter specifies a end point which is out of bounds |
| * Does not return a copy of the array if possible, i.e. if start is zero |
| * and length equals the length of the src array. |
| * |
| * @param src - the array from which elements need to be copied |
| * @param start - the start index in the src array |
| * @param length - the number of characters to copy |
| */ |
| public static String substring(char[] src, int start, int length) { |
| char[] chars= subarray(src, start, length); |
| if (chars != null) { |
| return new String(chars); |
| } else { |
| return null; |
| } |
| } |
| } |