/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library 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 library 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 library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.configure;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.jnode.configure.PropertySet.Value;
/**
* This class represents a property type defined by a regex. The constructor
* allows you to provide an "emptyToken" value. If provided, this value defines
* a special token that will be mapped to the empty string by the
* {@link #fromValue(String)} method.
*
* @author crawley@jnode.org
*/
public class PatternType extends PropertyType {
private final Pattern pattern;
private final String emptyToken;
/**
* Construct a Pattern type.
*
* @param name the type's name.
* @param pattern the Java regex that defines the type's value space
* @param emptyToken if non-null, this specifies a input token that will be
* mapped to the empty string value. You should avoid using
* characters that would require escaping in a Java regex.
*/
public PatternType(String name, Pattern pattern, String emptyToken) {
super(name);
this.pattern = pattern;
this.emptyToken = emptyToken;
}
@Override
public Value fromInput(String token) {
if (token.equals(emptyToken)) {
return new Value(token, "");
} else {
return fromValue(token);
}
}
@Override
public Value fromValue(String value) {
Matcher matcher = pattern.matcher(value);
if (matcher.matches()) {
if (value.equals("") && emptyToken != null) {
return new Value(emptyToken, value);
} else {
return new Value(value, value);
}
} else {
return null;
}
}
@Override
public String describe(Value defaultValue) {
StringBuffer sb = new StringBuffer();
sb.append("(/").append(pattern.toString()).append("/");
if (emptyToken != null) {
sb.append(" or '").append(emptyToken).append("'");
}
if (defaultValue != null) {
String dv = defaultValue.getToken();
sb.append(" [").append(dv).append("]");
}
sb.append(")");
return sb.toString();
}
}