private static void append(
final AppendingStringBuffer buffer, final CharSequence s, final int from, final int to) {
if (s instanceof AppendingStringBuffer) {
AppendingStringBuffer asb = (AppendingStringBuffer) s;
buffer.append(asb.getValue(), from, to - from);
} else {
buffer.append(s.subSequence(from, to));
}
}
/**
* Replace all occurrences of one string replaceWith another string.
*
* @param s The string to process
* @param searchFor The value to search for
* @param replaceWith The value to searchFor replaceWith
* @return The resulting string with searchFor replaced with replaceWith
*/
public static CharSequence replaceAll(
final CharSequence s, final CharSequence searchFor, CharSequence replaceWith) {
if (s == null) {
return null;
}
// If searchFor is null or the empty string, then there is nothing to
// replace, so returning s is the only option here.
if ((searchFor == null) || "".equals(searchFor)) {
return s;
}
// If replaceWith is null, then the searchFor should be replaced with
// nothing, which can be seen as the empty string.
if (replaceWith == null) {
replaceWith = "";
}
String searchString = searchFor.toString();
// Look for first occurrence of searchFor
int matchIndex = search(s, searchString, 0);
if (matchIndex == -1) {
// No replace operation needs to happen
return s;
} else {
// Allocate a AppendingStringBuffer that will hold one replacement
// with a
// little extra room.
int size = s.length();
final int replaceWithLength = replaceWith.length();
final int searchForLength = searchFor.length();
if (replaceWithLength > searchForLength) {
size += (replaceWithLength - searchForLength);
}
final AppendingStringBuffer buffer = new AppendingStringBuffer(size + 16);
int pos = 0;
do {
// Append text up to the match
append(buffer, s, pos, matchIndex);
// Add replaceWith text
buffer.append(replaceWith);
// Find next occurrence, if any
pos = matchIndex + searchForLength;
matchIndex = search(s, searchString, pos);
} while (matchIndex != -1);
// Add tail of s
buffer.append(s.subSequence(pos, s.length()));
// Return processed buffer
return buffer;
}
}
/**
* Converts a Throwable to a string.
*
* @param throwable The throwable
* @return The string
*/
public static String toString(final Throwable throwable) {
if (throwable != null) {
List<Throwable> al = new ArrayList<Throwable>();
Throwable cause = throwable;
al.add(cause);
while ((cause.getCause() != null) && (cause != cause.getCause())) {
cause = cause.getCause();
al.add(cause);
}
AppendingStringBuffer sb = new AppendingStringBuffer(256);
// first print the last cause
int length = al.size() - 1;
cause = al.get(length);
if (throwable instanceof RuntimeException) {
sb.append("Message: ");
sb.append(throwable.getMessage());
sb.append("\n\n");
}
sb.append("Root cause:\n\n");
outputThrowable(cause, sb, false);
if (length > 0) {
sb.append("\n\nComplete stack:\n\n");
for (int i = 0; i < length; i++) {
outputThrowable(al.get(i), sb, true);
sb.append("\n");
}
}
return sb.toString();
} else {
return "<Null Throwable>";
}
}
/**
* Outputs the throwable and its stacktrace to the stringbuffer. If stopAtWicketSerlvet is true
* then the output will stop when the org.apache.wicket servlet is reached. sun.reflect. packages
* are filtered out.
*
* @param cause
* @param sb
* @param stopAtWicketServlet
*/
private static void outputThrowable(
final Throwable cause, final AppendingStringBuffer sb, final boolean stopAtWicketServlet) {
sb.append(cause);
sb.append("\n");
StackTraceElement[] trace = cause.getStackTrace();
for (int i = 0; i < trace.length; i++) {
String traceString = trace[i].toString();
if (!(traceString.startsWith("sun.reflect.") && (i > 1))) {
sb.append(" at ");
sb.append(traceString);
sb.append("\n");
if (stopAtWicketServlet
&& (traceString.startsWith("org.apache.wicket.protocol.http.WicketServlet")
|| traceString.startsWith("org.apache.wicket.protocol.http.WicketFilter"))) {
return;
}
}
}
}
/**
* Converts a String to multiline HTML markup by replacing newlines with line break entities
* (<br/>) and multiple occurrences of newline with paragraph break entities (<p>).
*
* @param s String to transform
* @return String with all single occurrences of newline replaced with <br/> and all
* multiple occurrences of newline replaced with <p>.
*/
public static CharSequence toMultilineMarkup(final CharSequence s) {
if (s == null) {
return null;
}
final AppendingStringBuffer buffer = new AppendingStringBuffer();
int newlineCount = 0;
buffer.append("<p>");
for (int i = 0; i < s.length(); i++) {
final char c = s.charAt(i);
switch (c) {
case '\n':
newlineCount++;
break;
case '\r':
break;
default:
if (newlineCount == 1) {
buffer.append("<br/>");
} else if (newlineCount > 1) {
buffer.append("</p><p>");
}
buffer.append(c);
newlineCount = 0;
break;
}
}
if (newlineCount == 1) {
buffer.append("<br/>");
} else if (newlineCount > 1) {
buffer.append("</p><p>");
}
buffer.append("</p>");
return buffer;
}
/**
* Converts a Java String to an HTML markup String by replacing illegal characters with HTML
* entities where appropriate. Spaces are converted to non-breaking spaces (<nbsp>) if
* escapeSpaces is true, tabs are converted to four non-breaking spaces, less than signs are
* converted to &lt; entities and greater than signs to &gt; entities.
*
* @param s The characters to escape
* @param escapeSpaces True to replace ' ' with nonbreaking space
* @param convertToHtmlUnicodeEscapes True to convert non-7 bit characters to unicode HTML (&#...)
* @return The escaped string
*/
public static CharSequence escapeMarkup(
final CharSequence s, final boolean escapeSpaces, final boolean convertToHtmlUnicodeEscapes) {
if (s == null) {
return null;
}
int len = s.length();
final AppendingStringBuffer buffer = new AppendingStringBuffer((int) (len * 1.1));
for (int i = 0; i < len; i++) {
final char c = s.charAt(i);
switch (c) {
case '\t':
if (escapeSpaces) {
// Assumption is four space tabs (sorry, but that's
// just how it is!)
buffer.append(" ");
} else {
buffer.append(c);
}
break;
case ' ':
if (escapeSpaces) {
buffer.append(" ");
} else {
buffer.append(c);
}
break;
case '<':
buffer.append("<");
break;
case '>':
buffer.append(">");
break;
case '&':
buffer.append("&");
break;
case '"':
buffer.append(""");
break;
case '\'':
buffer.append("'");
break;
default:
int ci = 0xffff & c;
if (
// if this is non-printable and not whitespace (TAB, LF, CR)
((ci < 32) && (ci != 9) && (ci != 10) && (ci != 13))
||
// or non-ASCII (XXX: why 160+ ?!) and need to UNICODE escape it
(convertToHtmlUnicodeEscapes && (ci > 159))) {
buffer.append("&#");
buffer.append(Integer.toString(ci));
buffer.append(';');
} else {
// ASCII or whitespace
buffer.append(c);
}
break;
}
}
return buffer;
}