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package cgeo.geocaching.utils;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import org.eclipse.jdt.annotation.NonNull;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Wrapper around the regex {@link Matcher} class. This implementation optimizes the memory usage of the matched
* Strings.
*
*/
public class MatcherWrapper {
private final Matcher matcher;
public MatcherWrapper(@NonNull final Pattern pattern, @NonNull final String input) {
this.matcher = pattern.matcher(input);
}
/**
* see {@link Matcher#find()}
*/
public boolean find() {
return matcher.find();
}
public boolean find(final int start) {
return matcher.find(start);
}
/**
* see {@link Matcher#group(int)}
*/
public String group(final int index) {
return newString(matcher.group(index));
}
/**
* This method explicitly creates a new String instance from an already existing String. This is necessary to avoid
* huge memory leaks in our parser. If we do regular expression matching on large Strings, the returned matches are
* otherwise memory mapped substrings of the huge original String, therefore blocking the garbage collector from
* removing the huge input String.
* <p>
* Do not change this method, even if Findbugs and other tools will report a violation for that line!
*
*/
@SuppressFBWarnings("DM_STRING_CTOR")
private static String newString(final String input) {
if (input == null) {
return null;
}
return new String(input); // DON'T REMOVE THE "new String" HERE!
}
/**
* see {@link Matcher#groupCount()}
*/
public int groupCount() {
return matcher.groupCount();
}
/**
* see {@link Matcher#group()}
*/
public String group() {
return newString(matcher.group());
}
/**
* see {@link Matcher#start()}
*/
public int start() {
return matcher.start();
}
/**
* see {@link Matcher#replaceAll(String)}
*/
public String replaceAll(final String replacement) {
return newString(matcher.replaceAll(replacement));
}
/**
* see {@link Matcher#matches()}
*/
public boolean matches() {
return matcher.matches();
}
/**
* see {@link Matcher#replaceFirst(String)}
*/
public String replaceFirst(final String replacement) {
return newString(matcher.replaceFirst(replacement));
}
}
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