org.sonar.duplications.token.TokenQueue Maven / Gradle / Ivy
/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program 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 3 of the License, or (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.duplications.token;
import java.util.Deque;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
public class TokenQueue implements Iterable {
private final Deque tokenQueue;
public TokenQueue(List tokenList) {
tokenQueue = new LinkedList<>(tokenList);
}
public TokenQueue() {
tokenQueue = new LinkedList<>();
}
/**
* Retrieves, but does not remove, token from this queue.
*
* @return token from this queue, or null if this queue is empty.
*/
public Token peek() {
return tokenQueue.peek();
}
/**
* Retrieves and removes token from this queue.
*
* @return token from this queue, or null if this queue is empty.
*/
public Token poll() {
return tokenQueue.poll();
}
public int size() {
return tokenQueue.size();
}
public void add(Token token) {
tokenQueue.addLast(token);
}
public boolean isNextTokenValue(String expectedValue) {
Token nextToken = tokenQueue.peek();
if (nextToken == null) {
// queue is empty
return false;
}
return nextToken.getValue().equals(expectedValue);
}
@Override
public Iterator iterator() {
return tokenQueue.iterator();
}
public void pushForward(List matchedTokenList) {
ListIterator iter = matchedTokenList.listIterator(matchedTokenList.size());
while (iter.hasPrevious()) {
tokenQueue.addFirst(iter.previous());
}
}
}