org.apache.james.mailbox.model.search.PrefixedRegex Maven / Gradle / Ivy
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package org.apache.james.mailbox.model.search;
import java.util.Objects;
import java.util.Optional;
import java.util.StringTokenizer;
import com.google.re2j.Pattern;
public class PrefixedRegex implements MailboxNameExpression {
private final String prefix;
private final String regex;
private final Pattern pattern;
private final char pathDelimiter;
public PrefixedRegex(String prefix, String regex, char pathDelimiter) {
this.prefix = Optional.ofNullable(prefix).orElse("");
this.regex = Optional.ofNullable(regex).orElse("");
this.pathDelimiter = pathDelimiter;
this.pattern = constructEscapedRegex(this.regex);
}
@Override
public boolean isExpressionMatch(String name) {
return name.startsWith(prefix)
&& regexMatching(name.substring(prefix.length()));
}
private boolean regexMatching(String name) {
if (isWild()) {
return name != null
&& pattern.matcher(name).matches();
} else {
return regex.equals(name);
}
}
@Override
public MailboxNameExpression includeChildren() {
return new PrefixedRegex(prefix, regex + "*", pathDelimiter);
}
@Override
public String getCombinedName() {
if (prefix != null && prefix.length() > 0) {
final int baseLength = prefix.length();
if (prefix.charAt(baseLength - 1) == pathDelimiter) {
if (regex != null && regex.length() > 0) {
if (regex.charAt(0) == pathDelimiter) {
return prefix + regex.substring(1);
} else {
return prefix + regex;
}
} else {
return prefix;
}
} else {
if (regex != null && regex.length() > 0) {
if (regex.charAt(0) == pathDelimiter) {
return prefix + regex;
} else {
return prefix + pathDelimiter + regex;
}
} else {
return prefix;
}
}
} else {
return regex;
}
}
@Override
public boolean isWild() {
return regex != null
&& (
regex.indexOf(FREEWILDCARD) >= 0
|| regex.indexOf(LOCALWILDCARD) >= 0);
}
private Pattern constructEscapedRegex(String regex) {
StringBuilder stringBuilder = new StringBuilder();
StringTokenizer tokenizer = new StringTokenizer(regex, "*%", true);
while (tokenizer.hasMoreTokens()) {
stringBuilder.append(getRegexPartAssociatedWithToken(tokenizer));
}
return Pattern.compile(stringBuilder.toString());
}
private String getRegexPartAssociatedWithToken(StringTokenizer tokenizer) {
String token = tokenizer.nextToken();
if (token.equals("*")) {
return ".*";
} else if (token.equals("%")) {
return "[^" + Pattern.quote(String.valueOf(pathDelimiter)) + "]*";
} else {
return Pattern.quote(token);
}
}
@Override
public final boolean equals(Object o) {
if (o instanceof PrefixedRegex) {
PrefixedRegex that = (PrefixedRegex) o;
return Objects.equals(this.pathDelimiter, that.pathDelimiter)
&& Objects.equals(this.prefix, that.prefix)
&& Objects.equals(this.regex, that.regex);
}
return false;
}
@Override
public final int hashCode() {
return Objects.hash(prefix, regex, pathDelimiter);
}
}