gov.nasa.arc.pds.tools.util.StrUtils Maven / Gradle / Ivy
Show all versions of pds4-jparser Show documentation
package gov.nasa.arc.pds.tools.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This class provides utilities for string formatting.
*
* @author jagander
*/
@SuppressWarnings("nls")
public class StrUtils {
// default length to truncate to
public static final int DEFAULT_TRUNCATE_LENGTH = 100;
// javascript newline
public static final String JS_NEWLINE = "\n";
// xhtml newline
public static final String HTML_NEWLINE = "
";
// default stack trace lines in exception toString
public static final int DEFAULT_STACK_LINES = 4;
// regex to collapse whitespace
public static final Pattern NORMALIZE_WHITE_SPACE_REGEX = Pattern.compile(
"\\s+", Pattern.MULTILINE);
// regex to get base part of url, assumes valid url
public static final Pattern URL_BASE_REGEX = Pattern
.compile("^(https?://[^/]+)(([^\\?]*/).*)?");
// all valid ascii characters including printable control characters
public static final String ASCII_CHAR_RANGE = "\\r\\n\\t -~";
public static final Pattern ASCII_CHARS_REGEX = Pattern.compile("^["
+ ASCII_CHAR_RANGE + "]*$", Pattern.MULTILINE);
public static final Pattern STRIP_ASCII_REGEX = Pattern.compile("["
+ ASCII_CHAR_RANGE + "]+", Pattern.MULTILINE);
// 1-3 digits followed by N collections of a separator and 3 digits followed
// by an optional decimal separator and N digits
// "10.000.000"
public static final Pattern NUMERIC_REGEX = Pattern
.compile("^[+-]?\\d{1,3}(((,\\d{3})*(\\.\\d+)?)|((\\.\\d{3})*(,\\d+)?))?$");
public static final Pattern SIMPLE_NUMERIC_REGEX = Pattern
.compile("^[+-]?((\\d+((,|\\.)\\d*)?)|((,|\\.)\\d+))$");
// TODO: figure out how to support something like ...enum(';','a');
public static final Pattern STATEMENT_REGEX = Pattern.compile("^[^;]+;\n",
Pattern.MULTILINE | Pattern.DOTALL);
public static final Pattern STRIP_PADDING = Pattern
.compile(
"[ \\t\\x0B]*([^ \\t\\x0B\\n\\r\\f]([^\\n\\r\\f]*[^ \\t\\x0B\\n\\r\\f])?)[ \\t\\x0B]*",
Pattern.MULTILINE);
/**
* Special characters within a regular expression. Listed here so that
* variable strings that may be used in a regular expression match can be
* escaped.
*
* @see #escapeRegex(String)
*/
public final static String[] REGEX_SPECIAL_CHARS = new String[] { "\\",
"/", ".", "*", "+", "?", "|", "(", ")", "[", "]", "{", "}" };
/**
* Scrub a String for things that make it unsuitable to insert into a
* JavaScript string. Modify the string as necessary to make it safe but
* preserve display.
*
* Currently this only addresses non-escaped single quotes, double quotes
* and non-meaningful backslashes. Other issues will be addressed as
* discovered.
*
* @param string
* - the string to be cleaned.
* @return The cleaned string.
*/
// TODO: fix this to not escape things already escaped?
public static String safeJS(final String string) {
String returnString = string;
// replace backslashes - make odd number even if not followed by char's
// we want to remain escaped
// returnString =
// returnString.replaceAll("([^\\\\]?+(\\\\\\\\)*+\\\\[^\'\"\\\\]?+)",
// "\\\\$1");
// replace non escaped double quotes with escaped quotes
// returnString =
// returnString.replaceAll("((^\\\\)?+(\\\\\\\\)*+)(\"|\')",
// "$1\\\\$4");
returnString = returnString.replaceAll("(\"|\'|\\\\)", "\\\\$1");
return returnString;
}
/**
* Remove quotes surrounding a string. This is useful in cases that you are
* retrieving strings from a file and each value is quoted.
*
* @param string
* - the string to remove surrounding quotes from
* @return original string minus surrounding quotes
*/
public static String dequote(final String string) {
return string.replaceFirst("^\"(.*)\"$", "$1");
}
/**
* A generic string representation of a list. It just calls the toString
* method on each item and inserts a xhtml break or newline between the
* items. What type of newline to use is dependent on the flag for whether
* the output is for javascript.
*
* @param list
* - a list of objects with a usable toString() on each object
* @param isJS
* - flag for whether the output is for javascript or xhtml
* markup
* @return a string representation of the list
*/
public static String toString(final List list, final Boolean isJS) {
String lineBreak = null;
String returnString = "";
if (isJS == null || !isJS) {
lineBreak = "
";
} else {
lineBreak = "\n";
}
Iterator it = list.iterator();
while (it.hasNext()) {
Object element = it.next();
returnString += element.toString();
if (it.hasNext()) {
returnString += lineBreak;
}
}
return returnString;
}
/**
* Get a reasonable string representation of an exception. "Reasonable" is
* either the exception message or exception name plus some number of lines
* of the stacktrace.
*
* @param e
* - exception to convert to string
* @param isJS
* - flag to indicate if you want javascript newlines or html
* newlines
* @param lines
* - number of stacktrace lines to add to representation
* @return a string representation of an exception
*
*/
public static String toString(final Exception e, Boolean isJS, Integer lines) {
// default to HTML newlines if not set
String newline = isJS == null || !isJS ? HTML_NEWLINE : JS_NEWLINE;
final StackTraceElement[] stackTrace = e.getStackTrace();
StackTraceElement[] causeTrace = null;
Throwable causeE = e.getCause();
if (causeE != null) {
causeTrace = causeE.getStackTrace();
}
// default to full stack if set
Integer numLines = lines == null ? stackTrace.length : lines;
// get message
String message = e.getMessage();
// if there was no message, get the toString of the exception
if (message == null) {
message = e.toString();
}
// add a portion of the stack trace
if (numLines > 0) {
for (int i = 0; i < numLines; i++) {
String stackString = stackTrace[i].toString();
if (!stackString.equals("")) {
message += newline + stackString;
}
}
}
if (causeTrace != null) {
numLines = causeTrace.length;
message += newline + "Caused by";
// add a portion of the stack trace
if (numLines > 0) {
for (int i = 0; i < numLines; i++) {
String stackString = causeTrace[i].toString();
if (!stackString.equals("")) {
message += newline + stackString;
}
}
}
}
return message;
}
// use default number of lines in stack
public static String toString(final Exception e, final Boolean isJS) {
return toString(e, isJS, DEFAULT_STACK_LINES);
}
/**
* The default usage of {@link #toString(List, Boolean)}, outputting in
* xhtml format.
*
* @param list
* - a list of objects with a usable toString() on each object
* @return a string representation of the list
*/
public static String toString(final List list) {
return toString(list, null);
}
public static String toString(final Object[] list) {
return toString(Arrays.asList(list), false);
}
public static String toString(final Object[] list, final Boolean isJS) {
return toString(Arrays.asList(list), isJS);
}
public static String toString(final String[] list, final Boolean isJS) {
return toString(Arrays.asList(list), isJS);
}
// NOTE: that this is not necessarily an accurate representation of file
// since newlines may not match
// NOTE: adds trailing newline to file even if there wasn't one
// TODO: do we want to close stream hear or in outer
public static String toString(final InputStream is) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
return sb.toString();
}
// null protect toString()
public static String toString(final Object object) {
return object == null ? null : object.toString();
}
/**
* Escape a string for use in a regular expression. This is useful when a
* block of text is to be used in a regular expression match.
*
* @param regexSource
* - source string to escape
* @return an escaped version of the string for use in a regular expression
*
* @see #REGEX_SPECIAL_CHARS
*/
public static String escapeRegex(final String regexSource) {
String returnString = regexSource;
for (final String specialChar : REGEX_SPECIAL_CHARS) {
returnString = returnString.replaceAll("\\" + specialChar, "\\\\\\"
+ specialChar);
}
return returnString;
}
/**
* Truncate a given string to a default length.
*
* @param string
* - string to truncate if necessary
* @return truncated string if longer than specified length + an elipses
* else the original string
*
* @see #DEFAULT_TRUNCATE_LENGTH
* @see #truncate(String, Integer)
*/
public static String truncate(final String string) {
return truncate(string, null);
}
/**
* Truncate a given string to a provided length.
*
* Note that the returned string may be longer than the specified length due
* to the addition of an elipses.
*
* Note that truncate length is defaulted if null
*
* @param string
* - string to truncate if necessary
* @param length
* - length to truncate to
* @return truncated string if longer than specified length + an elipses
* else the original string
*
* @see #DEFAULT_TRUNCATE_LENGTH
*/
public static String truncate(final String string, final Integer length) {
Integer truncateLength = length == null ? DEFAULT_TRUNCATE_LENGTH
: length;
if (string == null || string.length() <= truncateLength) {
return string;
}
return string.substring(0, truncateLength) + "...";
}
/**
* Normalize a string by trimming and compacting whitespace.
*
* @param string
* - string to normalize
* @return a trimmed and whitespace-compressed version of the string
*
* @see #NORMALIZE_WHITE_SPACE_REGEX
*/
public static String normalize(final String string) {
String returnString = string.trim();
final Matcher matcher = NORMALIZE_WHITE_SPACE_REGEX
.matcher(returnString);
return matcher.replaceAll(" ");
}
/**
* Get the base of a url such that you have a url string to the same folder.
* This is not particularly useful to a restful interface.
*
* Note that this requires the url string passed in to be a valid url.
* Typical usage is to get the base from the current URL. In that case, the
* url will always be valid.
*
* @param string
* - url to get base of.
* @return The base of the passed in url string.
*
* @see #URL_BASE_REGEX
*/
public static String getURLBase(final String string) {
final Matcher matcher = URL_BASE_REGEX.matcher(string);
if (matcher.matches()) {
String urlBase = matcher.group(1);
final String pastDomain = matcher.group(3);
if (pastDomain != null && pastDomain.length() > 0) {
return urlBase + pastDomain;
}
return urlBase + "/";
}
return null;
}
public static String getURLFilename(final String url) {
// strip get params which may contain a forward slash
// ignore domain stuff
URL URLObj = null;
try {
URLObj = new URL(url);
} catch (MalformedURLException e) {
// not a valid url
return null;
}
return getURLFilename(URLObj);
}
public static String getURIFilename(final URI uri) {
try {
return getURLFilename(uri.toURL());
} catch (MalformedURLException e) {
return null;
}
}
public static String getURLFilename(final URL url) {
String filename = url.getFile();
int paramIndex = filename.lastIndexOf("?");
if (paramIndex != -1) {
filename = filename.substring(0, paramIndex);
}
// strip non-file part
filename = filename.substring(filename.lastIndexOf("/") + 1, filename
.length());
return filename;
}
/**
* Test to see if string contains only ASCII characters.
*
* Note that '^', '*' and '$' match the empty string in the regex and the
* single occurrence of the empty string token can't do triple duty. We
* return true for an empty string explicitly rather than using the regex.
*
* @param string
* - string to test for non-ascii chars.
* @return boolean indicating if the string is all ASCII chars
*
* @see #ASCII_CHARS_REGEX
*/
public static boolean isASCII(final String string) {
if (string.length() == 0) {
return true;
}
final Matcher matcher = ASCII_CHARS_REGEX.matcher(string);
return matcher.matches();
}
/**
* Get any and all characters that are not ASCII.
*
* @param string
* - string to pull non-ASCII characters from
* @return string containing all non-ASCII chars
*
* @see #STRIP_ASCII_REGEX
*/
public static String getNonASCII(final String string) {
final Matcher matcher = STRIP_ASCII_REGEX.matcher(string);
String returnString = matcher.replaceAll("");
return returnString;
}
/**
* A generic comma separated string representation of a list. It just calls
* the toString method on each item and inserts a comma between the items.
*
* @param list
* - a list of objects with a usable toString() on each object
*
* @return a comma separated string representation of the list
*/
// TODO: allow different separator char, quoting, or other formatting
public static String toSeparatedString(final List list) {
String returnString = "";
Iterator it = list.iterator();
while (it.hasNext()) {
Object element = it.next();
String val = null;
val = element.toString();
returnString += val;
if (it.hasNext()) {
returnString += ", ";
}
}
return returnString;
}
public static String toSeparatedString(final Object[] array) {
if (array == null) {
return "";
}
List