/*
* Copyright (c) 2013, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
*
* 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 com.google.dart.engine.utilities.collection;
import com.google.dart.engine.scanner.Token;
import java.util.HashMap;
/**
* Instances of the class {@code TokenMap} map one set of tokens to another set of tokens.
*/
public class TokenMap {
/**
* A table mapping tokens to tokens. This should be replaced by a more performant implementation.
* One possibility is a pair of parallel arrays, with keys being sorted by their offset and a
* cursor indicating where to start searching.
*/
private HashMap<Token, Token> map = new HashMap<Token, Token>();
/**
* Initialize a newly created (and hence empty) map from one set of tokens to another set of
* tokens.
*/
public TokenMap() {
super();
}
/**
* Return the token that is mapped to the given token, or {@code null} if there is no token
* corresponding to the given token.
*
* @param key the token being mapped to another token
* @return the token that is mapped to the given token
*/
public Token get(Token key) {
return map.get(key);
}
/**
* Map the key to the value.
*
* @param key the token being mapped to the value
* @param value the token to which the key will be mapped
*/
public void put(Token key, Token value) {
map.put(key, value);
}
}