terms,
+ String delim)
+ {
+ StringBuilder sb = new StringBuilder(32);
+ if (terms != null && !terms.isEmpty())
+ {
+ boolean appended = false;
+ for (String term : terms)
+ {
+ if (appended)
+ {
+ sb.append(delim);
+ }
+ appended = true;
+ sb.append(term);
+ }
+ }
+ return sb.toString();
+ }
+
+ /**
+ * Convenience method to parse a string to an integer, returning 0 if the
+ * input is null or not a valid integer
+ *
+ * @param s
+ * @return
+ */
+ public static int parseInt(String s)
+ {
+ int result = 0;
+ if (s != null && s.length() > 0)
+ {
+ try
+ {
+ result = Integer.parseInt(s);
+ } catch (NumberFormatException ex)
+ {
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Compares two versions formatted as e.g. "3.4.5" and returns -1, 0 or 1 as
+ * the first version precedes, is equal to, or follows the second
+ *
+ * @param v1
+ * @param v2
+ * @return
+ */
+ public static int compareVersions(String v1, String v2)
+ {
+ return compareVersions(v1, v2, null);
+ }
+
+ /**
+ * Compares two versions formatted as e.g. "3.4.5b1" and returns -1, 0 or 1 as
+ * the first version precedes, is equal to, or follows the second
+ *
+ * @param v1
+ * @param v2
+ * @param pointSeparator
+ * a string used to delimit point increments in sub-tokens of the
+ * version
+ * @return
+ */
+ public static int compareVersions(String v1, String v2,
+ String pointSeparator)
+ {
+ if (v1 == null || v2 == null)
+ {
+ return 0;
+ }
+ String[] toks1 = v1.split("\\.");
+ String[] toks2 = v2.split("\\.");
+ int i = 0;
+ for (; i < toks1.length; i++)
+ {
+ if (i >= toks2.length)
+ {
+ /*
+ * extra tokens in v1
+ */
+ return 1;
+ }
+ String tok1 = toks1[i];
+ String tok2 = toks2[i];
+ if (pointSeparator != null)
+ {
+ /*
+ * convert e.g. 5b2 into decimal 5.2 for comparison purposes
+ */
+ tok1 = tok1.replace(pointSeparator, ".");
+ tok2 = tok2.replace(pointSeparator, ".");
+ }
+ try
+ {
+ float f1 = Float.valueOf(tok1);
+ float f2 = Float.valueOf(tok2);
+ int comp = Float.compare(f1, f2);
+ if (comp != 0)
+ {
+ return comp;
+ }
+ } catch (NumberFormatException e)
+ {
+ System.err
+ .println("Invalid version format found: " + e.getMessage());
+ return 0;
+ }
+ }
+
+ if (i < toks2.length)
+ {
+ /*
+ * extra tokens in v2
+ */
+ return -1;
+ }
+
+ /*
+ * same length, all tokens match
+ */
+ return 0;
+ }
+
+ /**
+ * Converts the string to all lower-case except the first character which is
+ * upper-cased
+ *
+ * @param s
+ * @return
+ */
+ public static String toSentenceCase(String s)
+ {
+ if (s == null)
+ {
+ return s;
+ }
+ if (s.length() <= 1)
+ {
+ return s.toUpperCase();
+ }
+ return s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase();
+ }
+
+ /**
+ * A helper method that strips off any leading or trailing html and body tags.
+ * If no html tag is found, then also html-encodes angle bracket characters.
+ *
+ * @param text
+ * @return
+ */
+ public static String stripHtmlTags(String text)
+ {
+ if (text == null)
+ {
+ return null;
+ }
+ String tmp2up = text.toUpperCase();
+ int startTag = tmp2up.indexOf("");
+ if (startTag > -1)
+ {
+ text = text.substring(startTag + 6);
+ tmp2up = tmp2up.substring(startTag + 6);
+ }
+ // is omission of "" intentional here??
+ int endTag = tmp2up.indexOf("");
+ if (endTag > -1)
+ {
+ text = text.substring(0, endTag);
+ tmp2up = tmp2up.substring(0, endTag);
+ }
+ endTag = tmp2up.indexOf("");
+ if (endTag > -1)
+ {
+ text = text.substring(0, endTag);
+ }
+
+ if (startTag == -1 && (text.contains("<") || text.contains(">")))
+ {
+ text = text.replaceAll("<", "<");
+ text = text.replaceAll(">", ">");
+ }
+ return text;
+ }
+
+ /**
+ * Answers the input string with any occurrences of the 'encodeable' characters
+ * replaced by their URL encoding
+ *
+ * @param s
+ * @param encodable
+ * @return
+ */
+ public static String urlEncode(String s, String encodable)
+ {
+ if (s == null || s.isEmpty())
+ {
+ return s;
+ }
+
+ /*
+ * do % encoding first, as otherwise it may double-encode!
+ */
+ if (encodable.indexOf(PERCENT) != -1)
+ {
+ s = urlEncode(s, PERCENT);
+ }
+
+ for (char c : encodable.toCharArray())
+ {
+ if (c != PERCENT)
+ {
+ s = urlEncode(s, c);
+ }
+ }
+ return s;
+ }
+
+ /**
+ * Answers the input string with any occurrences of {@code c} replaced with
+ * their url encoding. Answers the input string if it is unchanged.
+ *
+ * @param s
+ * @param c
+ * @return
+ */
+ static String urlEncode(String s, char c)
+ {
+ String decoded = String.valueOf(c);
+ if (s.indexOf(decoded) != -1)
+ {
+ String encoded = getUrlEncoding(c);
+ if (!encoded.equals(decoded))
+ {
+ s = s.replace(decoded, encoded);
+ }
+ }
+ return s;
+ }
+
+ /**
+ * Answers the input string with any occurrences of the specified (unencoded)
+ * characters replaced by their URL decoding.
+ *
+ * Example: {@code urlDecode("a%3Db%3Bc", "-;=,")} should answer
+ * {@code "a=b;c"}.
+ *
+ * @param s
+ * @param encodable
+ * @return
+ */
+ public static String urlDecode(String s, String encodable)
+ {
+ if (s == null || s.isEmpty())
+ {
+ return s;
+ }
+
+ for (char c : encodable.toCharArray())
+ {
+ String encoded = getUrlEncoding(c);
+ if (s.indexOf(encoded) != -1)
+ {
+ String decoded = String.valueOf(c);
+ s = s.replace(encoded, decoded);
+ }
+ }
+ return s;
+ }
+
+ /**
+ * Does a lazy lookup of the url encoding of the given character, saving the
+ * value for repeat lookups
+ *
+ * @param c
+ * @return
+ */
+ private static String getUrlEncoding(char c)
+ {
+ if (c < 0 || c >= urlEncodings.length)
+ {
+ return String.valueOf(c);
+ }
+
+ String enc = urlEncodings[c];
+ if (enc == null)
+ {
+ try
+ {
+ enc = urlEncodings[c] = URLEncoder.encode(String.valueOf(c),
+ "UTF-8");
+ } catch (UnsupportedEncodingException e)
+ {
+ enc = urlEncodings[c] = String.valueOf(c);
+ }
+ }
+ return enc;
+ }
}