juzu.impl.router.PatternBuilder Maven / Gradle / Ivy
/*
* Copyright 2013 eXo Platform SAS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package juzu.impl.router;
import juzu.impl.router.regex.Literal;
/**
* @author Julien Viet
* @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(CharSequence 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(CharSequence s, int from) {
return litteral(s, from, s.length());
}
public PatternBuilder literal(CharSequence s) {
return litteral(s, 0, s.length());
}
public PatternBuilder literal(char c) {
return literal(Character.toString(c));
}
public PatternBuilder clear() {
buffer.setLength(0);
return this;
}
public String build() {
return buffer.toString();
}
}