1 | /*
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2 | * Copyright 2001-2002,2004 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 | package org.apache.tools.ant.util;
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18 |
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19 | import java.io.PrintWriter;
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20 | import java.io.StringWriter;
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21 | import java.util.Vector;
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22 |
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23 | /**
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24 | * A set of helper methods related to string manipulation.
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25 | *
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26 | */
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27 | public final class StringUtils {
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28 |
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29 | /** the line separator for this OS */
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30 | public static final String LINE_SEP = System.getProperty("line.separator");
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31 |
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32 | /**
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33 | * Splits up a string into a list of lines. It is equivalent
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34 | * to <tt>split(data, '\n')</tt>.
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35 | * @param data the string to split up into lines.
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36 | * @return the list of lines available in the string.
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37 | */
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38 | public static Vector lineSplit(String data) {
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39 | return split(data, '\n');
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40 | }
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41 |
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42 | /**
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43 | * Splits up a string where elements are separated by a specific
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44 | * character and return all elements.
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45 | * @param data the string to split up.
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46 | * @param ch the separator character.
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47 | * @return the list of elements.
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48 | */
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49 | public static Vector split(String data, int ch) {
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50 | Vector elems = new Vector();
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51 | int pos = -1;
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52 | int i = 0;
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53 | while ((pos = data.indexOf(ch, i)) != -1) {
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54 | String elem = data.substring(i, pos);
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55 | elems.addElement(elem);
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56 | i = pos + 1;
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57 | }
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58 | elems.addElement(data.substring(i));
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59 | return elems;
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60 | }
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61 |
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62 | /**
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63 | * Replace occurrences into a string.
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64 | * @param data the string to replace occurrences into
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65 | * @param from the occurrence to replace.
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66 | * @param to the occurrence to be used as a replacement.
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67 | * @return the new string with replaced occurrences.
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68 | */
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69 | public static String replace(String data, String from, String to) {
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70 | StringBuffer buf = new StringBuffer(data.length());
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71 | int pos = -1;
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72 | int i = 0;
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73 | while ((pos = data.indexOf(from, i)) != -1) {
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74 | buf.append(data.substring(i, pos)).append(to);
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75 | i = pos + from.length();
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76 | }
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77 | buf.append(data.substring(i));
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78 | return buf.toString();
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79 | }
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80 |
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81 | /**
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82 | * Convenient method to retrieve the full stacktrace from a given exception.
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83 | * @param t the exception to get the stacktrace from.
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84 | * @return the stacktrace from the given exception.
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85 | */
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86 | public static String getStackTrace(Throwable t) {
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87 | StringWriter sw = new StringWriter();
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88 | PrintWriter pw = new PrintWriter(sw, true);
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89 | t.printStackTrace(pw);
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90 | pw.flush();
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91 | pw.close();
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92 | return sw.toString();
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93 | }
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94 |
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95 | }
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