/*
* Copyright (C) 2010 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;
import org.exoplatform.web.controller.regexp.Literal;
/**
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
class PatternBuilder {
/** . */
private final StringBuilder buffer = new StringBuilder();
/** . */
PatternBuilder() {
}
public PatternBuilder expr(CharSequence s) {
if (s == null) {
throw new NullPointerException("No null expression allowed");
}
buffer.append(s);
return this;
}
public PatternBuilder expr(char s) {
buffer.append(s);
return this;
}
public PatternBuilder litteral(String s, int from, int to) {
if (from < 0) {
throw new IllegalArgumentException("No negative from argument");
}
if (to > s.length()) {
throw new IllegalArgumentException("No to argument greater than the string length");
}
if (from > to) {
throw new IllegalArgumentException("The to argument cannot be greater than the from argument");
}
if (from < to) {
for (int i = from; i < to; i++) {
char c = s.charAt(i);
if (Literal.isEscaped(c)) {
buffer.append('\\');
}
buffer.append(c);
}
}
return this;
}
public PatternBuilder literal(String s, int from) {
return litteral(s, from, s.length());
}
public PatternBuilder literal(String s) {
return litteral(s, 0, s.length());
}
public PatternBuilder literal(char c) {
return literal(Character.toString(c));
}
public String build() {
return buffer.toString();
}
}