true, empty elements are generated
* @return an array of strings
*/
public static String[] explode(String str, int ch, boolean respectEmpty) {
if (str == null || str.length() == 0) {
return new String[0];
}
ArrayListoldString in text
* with newString.
*
* @param text
* @param oldString
* old substring to be replaced with newString
* @param newString
* new substring to replace occurrences of oldString
* @return a string
*/
public static String replace(String text, String oldString, String newString) {
if (text == null || oldString == null || newString == null) {
throw new IllegalArgumentException("null argument");
}
int pos = text.indexOf(oldString);
if (pos == -1) {
return text;
}
int lastPos = 0;
StringBuilder sb = new StringBuilder(text.length());
while (pos != -1) {
sb.append(text.substring(lastPos, pos));
sb.append(newString);
lastPos = pos + oldString.length();
pos = text.indexOf(oldString, lastPos);
}
if (lastPos < text.length()) {
sb.append(text.substring(lastPos));
}
return sb.toString();
}
/**
* Replaces XML characters in the given string that might need escaping as
* XML text or attribute
*
* @param text
* text to be escaped
* @return a string
*/
public static String encodeIllegalXMLCharacters(String text) {
return encodeMarkupCharacters(text, false);
}
/**
* Replaces HTML characters in the given string that might need escaping as
* HTML text or attribute
*
* @param text
* text to be escaped
* @return a string
*/
public static String encodeIllegalHTMLCharacters(String text) {
return encodeMarkupCharacters(text, true);
}
private static String encodeMarkupCharacters(String text, boolean isHtml) {
if (text == null) {
throw new IllegalArgumentException("null argument");
}
StringBuilder buf = null;
int length = text.length();
int pos = 0;
for (int i = 0; i < length; i++) {
int ch = text.charAt(i);
switch (ch) {
case '<':
case '>':
case '&':
case '"':
case '\'':
if (buf == null) {
buf = new StringBuilder();
}
if (i > 0) {
buf.append(text.substring(pos, i));
}
pos = i + 1;
break;
default:
continue;
}
if (ch == '<') {
buf.append("<");
} else if (ch == '>') {
buf.append(">");
} else if (ch == '&') {
buf.append("&");
} else if (ch == '"') {
buf.append(""");
} else if (ch == '\'') {
buf.append(isHtml ? "'" : "'");
}
}
if (buf == null) {
return text;
} else {
if (pos < length) {
buf.append(text.substring(pos));
}
return buf.toString();
}
}
/**
* The list of characters that are not encoded by the escape()
* and unescape() METHODS. They contains the characters as
* defined 'unreserved' in section 2.3 of the RFC 2396 'URI generic syntax':
* * *
* unreserved = alphanum | mark
* mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
*
*/
public static BitSet URISave;
/**
* Same as {@link #URISave} but also contains the '/'
*/
public static BitSet URISaveEx;
static {
URISave = new BitSet(256);
int i;
for (i = 'a'; i <= 'z'; i++) {
URISave.set(i);
}
for (i = 'A'; i <= 'Z'; i++) {
URISave.set(i);
}
for (i = '0'; i <= '9'; i++) {
URISave.set(i);
}
URISave.set('-');
URISave.set('_');
URISave.set('.');
URISave.set('!');
URISave.set('~');
URISave.set('*');
URISave.set('\'');
URISave.set('(');
URISave.set(')');
URISaveEx = (BitSet) URISave.clone();
URISaveEx.set('/');
}
/**
* Does an URL encoding of the string using the
* escape character. The characters that don't need encoding
* are those defined 'unreserved' in section 2.3 of the 'URI generic syntax'
* RFC 2396, but without the escape character.
*
* @param string
* the string to encode.
* @param escape
* the escape character.
* @return the escaped string
* @throws NullPointerException
* if string is null.
*/
public static String escape(String string, char escape) {
return escape(string, escape, false);
}
/**
* Does an URL encoding of the string using the
* escape character. The characters that don't need encoding
* are those defined 'unreserved' in section 2.3 of the 'URI generic syntax'
* RFC 2396, but without the escape character. If isPath is
* true, additionally the slash '/' is ignored, too.
*
* @param string
* the string to encode.
* @param escape
* the escape character.
* @param isPath
* if true, the string is treated as path
* @return the escaped string
* @throws NullPointerException
* if string is null.
*/
public static String escape(String string, char escape, boolean isPath) {
try {
BitSet validChars = isPath ? URISaveEx : URISave;
byte[] bytes = string.getBytes("utf-8");
StringBuilder out = new StringBuilder(bytes.length);
for (byte aByte : bytes) {
int c = aByte & 0xff;
if (validChars.get(c) && c != escape) {
out.append((char) c);
} else {
out.append(escape);
out.append(hexTable[(c >> 4) & 0x0f]);
out.append(hexTable[(c) & 0x0f]);
}
}
return out.toString();
} catch (UnsupportedEncodingException e) {
throw new InternalError(e.toString());
}
}
/**
* Does a URL encoding of the string. The characters that don't
* need encoding are those defined 'unreserved' in section 2.3 of the 'URI
* generic syntax' RFC 2396.
*
* @param string
* the string to encode
* @return the escaped string
* @throws NullPointerException
* if string is null.
*/
public static String escape(String string) {
return escape(string, '%');
}
/**
* Does a URL encoding of the path. The characters that don't
* need encoding are those defined 'unreserved' in section 2.3 of the 'URI
* generic syntax' RFC 2396. In contrast to the {@link #escape(String)}
* method, not the entire path string is escaped, but every individual part
* (i.e. the slashes are not escaped).
*
* @param path
* the path to encode
* @return the escaped path
* @throws NullPointerException
* if path is null.
*/
public static String escapePath(String path) {
return escape(path, '%', true);
}
/**
* Does a URL decoding of the string using the
* escape character. Please note that in opposite to the
* {@link java.net.URLDecoder} it does not transform the + into spaces.
*
* @param string
* the string to decode
* @param escape
* the escape character
* @return the decoded string
* @throws NullPointerException
* if string is null.
* @throws IllegalArgumentException
* if the 2 characters following the escape character do not
* represent a hex-number or if not enough characters follow an
* escape character
*/
public static String unescape(String string, char escape) {
try {
byte[] utf8 = string.getBytes("utf-8");
// Check whether escape occurs at invalid position
if ((utf8.length >= 1 && utf8[utf8.length - 1] == escape)
|| (utf8.length >= 2 && utf8[utf8.length - 2] == escape)) {
throw new IllegalArgumentException("Premature end of escape sequence at end of input");
}
ByteArrayOutputStream out = new ByteArrayOutputStream(utf8.length);
for (int k = 0; k < utf8.length; k++) {
byte b = utf8[k];
if (b == escape) {
out.write((decodeDigit(utf8[++k]) << 4) + decodeDigit(utf8[++k]));
} else {
out.write(b);
}
}
return new String(out.toByteArray(), "utf-8");
} catch (UnsupportedEncodingException e) {
throw new InternalError(e.toString());
}
}
/**
* Does a URL decoding of the string. Please note that in
* opposite to the {@link java.net.URLDecoder} it does not transform the +
* into spaces.
*
* @param string
* the string to decode
* @return the decoded string
* @throws NullPointerException
* if string is null.
* @throws ArrayIndexOutOfBoundsException
* if not enough character follow an escape character
* @throws IllegalArgumentException
* if the 2 characters following the escape character do not
* represent a hex-number.
*/
public static String unescape(String string) {
return unescape(string, '%');
}
/**
* Escapes all illegal JCR name characters of a string. The encoding is
* loosely modeled after URI encoding, but only encodes the characters it
* absolutely needs to in order to make the resulting string a valid JCR
* name. Use {@link #unescapeIllegalJcrChars(String)} for decoding.
*
* QName EBNF:
*
* QName EBNF:
*
* Example:
* A search string like 'test?' will run into a ParseException documented in
* http://issues.apache.org/jira/browse/JCR-1248
*
* @param s
* the string to encode
* @return the escaped string
*/
public static String escapeIllegalXpathSearchChars(String s) {
StringBuilder sb = new StringBuilder();
sb.append(s.substring(0, (s.length() - 1)));
char c = s.charAt(s.length() - 1);
// NOTE: keep this in sync with _ESCAPED_CHAR below!
if (c == '!' || c == '(' || c == ':' || c == '^' || c == '[' || c == ']' || c == '{' || c == '}' || c == '?') {
sb.append('\\');
}
sb.append(c);
return sb.toString();
}
/**
* Unescapes previously escaped jcr chars.
*
* Please note, that this does not exactly the same as the url related
* {@link #unescape(String)}, since it handles the byte-encoding
* differently.
*
* @param name
* the name to unescape
* @return the unescaped name
*/
public static String unescapeIllegalJcrChars(String name) {
StringBuilder buffer = new StringBuilder(name.length());
int i = name.indexOf('%');
while (i > -1 && i + 2 < name.length()) {
buffer.append(name.toCharArray(), 0, i);
int a = Character.digit(name.charAt(i + 1), 16);
int b = Character.digit(name.charAt(i + 2), 16);
if (a > -1 && b > -1) {
buffer.append((char) (a * 16 + b));
name = name.substring(i + 3);
} else {
buffer.append('%');
name = name.substring(i + 1);
}
i = name.indexOf('%');
}
buffer.append(name);
return buffer.toString();
}
/**
* Returns the name part of the path. If the given path is already a name
* (i.e. contains no slashes) it is returned.
*
* @param path
* the path
* @return the name part or null if path is
* null.
*/
public static String getName(String path) {
return getName(path, '/');
}
/**
* Returns the name part of the path, delimited by the given
* delim. If the given path is already a name (i.e. contains no
* delim characters) it is returned.
*
* @param path
* the path
* @param delim
* the delimiter
* @return the name part or null if path is
* null.
*/
public static String getName(String path, char delim) {
return path == null ? null : path.substring(path.lastIndexOf(delim) + 1);
}
/**
* Same as {@link #getName(String)} but adding the possibility to pass paths
* that end with a trailing '/'
*
* @see #getName(String)
*/
public static String getName(String path, boolean ignoreTrailingSlash) {
if (ignoreTrailingSlash && path != null && path.endsWith("/") && path.length() > 1) {
path = path.substring(0, path.length() - 1);
}
return getName(path);
}
/**
* Returns the namespace prefix of the given qname. If the
* prefix is missing, an empty string is returned. Please note, that this
* method does not validate the name or prefix.
*
qname is null
*/
public static String getNamespacePrefix(String qname) {
int pos = qname.indexOf(':');
return pos >= 0 ? qname.substring(0, pos) : "";
}
/**
* Returns the local name of the given qname. Please note, that
* this method does not validate the name.
*
* the qname has the format: qname := [prefix ':'] local;
*
* @param qname
* a qualified name
* @return the localname
*
* @see #getNamespacePrefix(String)
*
* @throws NullPointerException
* if qname is null
*/
public static String getLocalName(String qname) {
int pos = qname.indexOf(':');
return pos >= 0 ? qname.substring(pos + 1) : qname;
}
/**
* Determines, if two paths denote hierarchical siblins.
*
* @param p1
* first path
* @param p2
* second path
* @return true if on same level, false otherwise
*/
public static boolean isSibling(String p1, String p2) {
int pos1 = p1.lastIndexOf('/');
int pos2 = p2.lastIndexOf('/');
return (pos1 == pos2 && pos1 >= 0 && p1.regionMatches(0, p2, 0, pos1));
}
/**
* Determines if the descendant path is hierarchical a
* descendant of path.
*
* @param path
* the current path
* @param descendant
* the potential descendant
* @return true if the descendant is a descendant;
* false otherwise.
*/
public static boolean isDescendant(String path, String descendant) {
String pattern = path.endsWith("/") ? path : path + "/";
return !pattern.equals(descendant) && descendant.startsWith(pattern);
}
/**
* Determines if the descendant path is hierarchical a
* descendant of path or equal to it.
*
* @param path
* the path to check
* @param descendant
* the potential descendant
* @return true if the descendant is a descendant
* or equal; false otherwise.
*/
public static boolean isDescendantOrEqual(String path, String descendant) {
if (path.equals(descendant)) {
return true;
} else {
String pattern = path.endsWith("/") ? path : path + "/";
return descendant.startsWith(pattern);
}
}
/**
* Returns the nth relative parent of the path, where n=level.
*
* Example:
*
* Text.getRelativeParent("/foo/bar/test", 1) == "/foo/bar"
*
*
* @param path
* the path of the page
* @param level
* the level of the parent
*/
public static String getRelativeParent(String path, int level) {
int idx = path.length();
while (level > 0) {
idx = path.lastIndexOf('/', idx - 1);
if (idx < 0) {
return "";
}
level--;
}
return (idx == 0) ? "/" : path.substring(0, idx);
}
/**
* Same as {@link #getRelativeParent(String, int)} but adding the
* possibility to pass paths that end with a trailing '/'
*
* @see #getRelativeParent(String, int)
*/
public static String getRelativeParent(String path, int level, boolean ignoreTrailingSlash) {
if (ignoreTrailingSlash && path.endsWith("/") && path.length() > 1) {
path = path.substring(0, path.length() - 1);
}
return getRelativeParent(path, level);
}
/**
* Returns the nth absolute parent of the path, where n=level.
*
* Example:
*
* Text.getAbsoluteParent("/foo/bar/test", 1) == "/foo/bar"
*
*
* @param path
* the path of the page
* @param level
* the level of the parent
*/
public static String getAbsoluteParent(String path, int level) {
int idx = 0;
int len = path.length();
while (level >= 0 && idx < len) {
idx = path.indexOf('/', idx + 1);
if (idx < 0) {
idx = len;
}
level--;
}
return level >= 0 ? "" : path.substring(0, idx);
}
/**
* Performs variable replacement on the given string value. Each
* ${...} sequence within the given value is replaced with the
* value of the named parser variable. If a variable is not found in the
* properties an IllegalArgumentException is thrown unless
* ignoreMissing is true. In the later case, the
* missing variable is replaced by the empty string.
*
* @param value
* the original value
* @param ignoreMissing
* if true, missing variables are replaced by the
* empty string.
* @return value after variable replacements
* @throws IllegalArgumentException
* if the replacement of a referenced variable is not found
*/
public static String replaceVariables(Properties variables, String value, boolean ignoreMissing)
throws IllegalArgumentException {
StringBuilder result = new StringBuilder();
// Value:
// +--+-+--------+-+-----------------+
// | |p|--> |q|--> |
// +--+-+--------+-+-----------------+
int p = 0, q = value.indexOf("${"); // Find first ${
while (q != -1) {
result.append(value.substring(p, q)); // Text before ${
p = q;
q = value.indexOf("}", q + 2); // Find }
if (q != -1) {
String variable = value.substring(p + 2, q);
String replacement = variables.getProperty(variable);
if (replacement == null) {
if (ignoreMissing) {
replacement = "";
} else {
throw new IllegalArgumentException("Replacement not found for ${" + variable + "}.");
}
}
result.append(replacement);
p = q + 1;
q = value.indexOf("${", p); // Find next ${
}
}
result.append(value.substring(p, value.length())); // Trailing text
return result.toString();
}
private static byte decodeDigit(byte b) {
if (b >= 0x30 && b <= 0x39) {
return (byte) (b - 0x30);
} else if (b >= 0x41 && b <= 0x46) {
return (byte) (b - 0x37);
} else if (b >= 0x61 && b <= 0x66) {
return (byte) (b - 0x57);
} else {
throw new IllegalArgumentException("Escape sequence is not hexadecimal: " + (char) b);
}
}
}