/*
* Copyright (C) 2009 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.patcher;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
/**
* The various SetSymbol patch scripts cause events in patched source to emit push and pop calls onto this symbol stack.
*
* Use this class to see if a certain method is in the JVM thread stack (faster than looping through the stack trace).
*/
public class Symbols {
private static final ThreadLocal<LinkedList<String>> stack = new ThreadLocal<LinkedList<String>>() {
@Override protected LinkedList<String> initialValue() {
return new LinkedList<String>();
}
};
private Symbols() {}
/**
* Calls to push are automatically generated by the SetSymbol patch scripts. Do not call it yourself!
*/
public static void push(String symbol) {
stack.get().addFirst(symbol);
}
/**
* Calls to pop are automatically generated by the SetSymbol patch scripts. Do not call it yourself!
*/
public static void pop() {
stack.get().poll();
}
public static boolean isEmpty() {
return stack.get().isEmpty();
}
public static int size() {
return stack.get().size();
}
/**
* Checks if the given symbol appears anywhere on the stack.
*/
public static boolean hasSymbol(String symbol) {
if (symbol == null) throw new NullPointerException("symbol");
return stack.get().contains(symbol);
}
/**
* Checks if the last symbol put on the stack equals a given symbol.
*/
public static boolean hasTail(String symbol) {
if (symbol == null) throw new NullPointerException("symbol");
return symbol.equals(stack.get().peek());
}
/**
* Returns a {@code List} that starts at the oldest thing thrown on the stack, and ends with the latest.
* It's a copy, so mess with it, save it, modify it in another thread, whatever you want.
*/
public static List<String> getCopy() {
return new ArrayList<String>(stack.get());
}
}