/*
* Copyright (C) 2011 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.web.controller.router;
/** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
public abstract class Regex {
/** . */
public static final Match[] NO_MATCHES = new Match[0];
/** . */
public static final Match NULL_MATCH = new Match(-1, -1, null);
/** An index set by the router to do matcher reuse easily, the regex implementation should not care about it. */
int index = -1;
public abstract String getPattern();
public abstract Matcher matcher();
public abstract static class Matcher {
public abstract boolean matches(CharSequence s);
public abstract Match[] find(CharSequence s);
}
public static class Match {
/** . */
private final int start;
/** . */
private final int end;
/** . */
private final String value;
protected Match(int start, int end, String value) {
this.start = start;
this.end = end;
this.value = value;
}
public int getStart() {
return start;
}
public int getEnd() {
return end;
}
public String getValue() {
return value;
}
}
public static class Java extends Regex {
/** . */
private final java.util.regex.Pattern pattern;
public Java(String regex) {
this.pattern = java.util.regex.Pattern.compile(regex);
}
public Matcher matcher() {
return new Matcher() {
/** . */
private java.util.regex.Matcher impl;
private java.util.regex.Matcher get(CharSequence s) {
if (impl == null) {
impl = pattern.matcher(s);
} else {
impl.reset(s);
}
return impl;
}
@Override
public boolean matches(CharSequence s) {
return get(s).matches();
}
@Override
public Match[] find(CharSequence s) {
java.util.regex.Matcher matcher = get(s);
if (matcher.find()) {
Match[] matches = new Match[1 + matcher.groupCount()];
for (int i = 0; i <= matcher.groupCount(); i++) {
if (matcher.group() != null) {
matches[i] = new Match(matcher.start(i), matcher.end(i), matcher.group(i));
} else {
matches[i] = NULL_MATCH;
}
}
return matches;
} else {
return NO_MATCHES;
}
}
};
}
@Override
public String getPattern() {
return pattern.pattern();
}
}
}