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/*
* RestorableTokenSource.java
*
* comments here.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1998 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package io.devnulllabs.openjava.syntax;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.tools.parser.Token;
/**
* The class <code>RestorableTokenSource</code>
* <p>
* For example
* <pre>
* </pre>
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: RestorableTokenSource.java,v 1.2 2003/02/19 02:54:31 tatsubori Exp $
* @see java.lang.Object
*/
public class RestorableTokenSource implements TokenSource {
private TokenSource tokenSource;
private Environment env;
private int pointer = 0;
private int offset = 0;
public RestorableTokenSource(TokenSource src, Environment env) {
this.tokenSource = src;
this.env = env;
}
public RestorableTokenSource(TokenSource src) {
this(src, null);
}
public Environment getEnvironment() {
return ((env == null) ? tokenSource.getEnvironment() : env);
}
public void assume() {
offset = pointer;
}
public void restore() {
pointer = offset;
}
public void fix() {
for (int i = offset; i < pointer; ++i) {
tokenSource.getNextToken();
}
pointer = 0;
offset = 0;
}
public Token getNextToken() {
return tokenSource.getToken(++pointer);
}
public Token getToken(int i) {
return tokenSource.getToken(pointer + i);
}
}
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