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package org.dcache.util;
import com.google.common.collect.ImmutableSet;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;
/**
* String conversion untilities for using with Java Regex Patterns. This code
* has been moved to commons because it is now shared by more than one module.
*
* @author arossi
*/
public class RegexUtils {
public static final String CASE_INSENSITIVE = "CASE_INSENSITIVE";
public static final String MULTILINE = "MULTILINE";
public static final String DOTALL = "DOTALL";
public static final String UNICODE_CASE = "UNICODE_CASE";
public static final String CANON_EQ = "CANON_EQ";
public static final String LITERAL = "LITERAL";
public static final String COMMENTS = "COMMENTS";
public static final String UNIX_LINES = "UNIX_LINES";
public static final ImmutableSet<String> FLAG_VALUES
= new ImmutableSet.Builder<String>()
.add(CASE_INSENSITIVE)
.add(MULTILINE)
.add(DOTALL)
.add(UNICODE_CASE)
.add(CANON_EQ)
.add(LITERAL)
.add(COMMENTS)
.add(UNIX_LINES)
.build();
/**
* Translates the string representation of the {@link Pattern} flags into
* the corresponding Java int value. String can be an or'd set, e.g.,
* "CASE_INSENTIVE | DOTALL".
*
* @param flags
* string representing the or'd flags
* @return corresponding internal value
*/
public static int parseFlags(String flags) {
if (flags == null) {
return 0;
}
int value = 0;
String[] split = flags.split("[|]");
for (String s : split) {
switch (s.trim()) {
case CASE_INSENSITIVE:
value |= Pattern.CASE_INSENSITIVE;
break;
case MULTILINE:
value |= Pattern.MULTILINE;
break;
case DOTALL:
value |= Pattern.DOTALL;
break;
case UNICODE_CASE:
value |= Pattern.UNICODE_CASE;
break;
case CANON_EQ:
value |= Pattern.CANON_EQ;
break;
case LITERAL:
value |= Pattern.LITERAL;
break;
case COMMENTS:
value |= Pattern.COMMENTS;
break;
case UNIX_LINES:
value |= Pattern.UNIX_LINES;
break;
}
}
return value;
}
/**
* Gives a string representation of the flags value.
*
* @param flags
* internal value
* @return corresponding string representing the or'd flags
*/
public static String flagsToString(int flags) {
StringBuilder result = new StringBuilder();
List<String> options = new ArrayList<>();
if ((flags & Pattern.CASE_INSENSITIVE ) == Pattern.CASE_INSENSITIVE ) {
options.add(CASE_INSENSITIVE);
}
if ((flags & Pattern.MULTILINE ) == Pattern.MULTILINE ) {
options.add(MULTILINE);
}
if ((flags & Pattern.DOTALL ) == Pattern.DOTALL ) {
options.add(UNIX_LINES);
}
if ((flags & Pattern.UNICODE_CASE ) == Pattern.UNICODE_CASE ) {
options.add(UNICODE_CASE);
}
if ((flags & Pattern.CANON_EQ ) == Pattern.CANON_EQ ) {
options.add(CANON_EQ);
}
if ((flags & Pattern.LITERAL ) == Pattern.LITERAL ) {
options.add(LITERAL);
}
if ((flags & Pattern.COMMENTS ) == Pattern.COMMENTS ) {
options.add(COMMENTS);
}
if ((flags & Pattern.UNIX_LINES ) == Pattern.UNIX_LINES ) {
options.add(UNIX_LINES);
}
Iterator<String> it = options.iterator();
if (it.hasNext()) {
result.append(it.next());
} else {
return null;
}
while(it.hasNext()) {
result.append( " | " ).append(it.next());
}
return result.toString();
}
}