/*
* Copyright 2002-2009 the original author or authors.
*
* 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 org.springframework.expression.spel.standard;
/**
* Holder for a kind of token, the associated data and its position in the input data stream (start/end).
*
* @author Andy Clement
* @since 3.0
*/
class Token {
TokenKind kind;
String data;
int startpos; // index of first character
int endpos; // index of char after the last character
/**
* Constructor for use when there is no particular data for the token (eg. TRUE or '+')
* @param startpos the exact start
* @param endpos the index to the last character
*/
Token(TokenKind tokenKind, int startpos, int endpos) {
this.kind = tokenKind;
this.startpos = startpos;
this.endpos = endpos;
}
Token(TokenKind tokenKind, char[] tokenData, int pos, int endpos) {
this(tokenKind,pos,endpos);
this.data = new String(tokenData);
}
public TokenKind getKind() {
return kind;
}
public String toString() {
StringBuilder s = new StringBuilder();
s.append("[").append(kind.toString());
if (kind.hasPayload()) {
s.append(":").append(data);
}
s.append("]");
s.append("(").append(startpos).append(",").append(endpos).append(")");
return s.toString();
}
public boolean isIdentifier() {
return kind==TokenKind.IDENTIFIER;
}
public boolean isNumericRelationalOperator() {
return kind==TokenKind.GT || kind==TokenKind.GE || kind==TokenKind.LT || kind==TokenKind.LE || kind==TokenKind.EQ || kind==TokenKind.NE;
}
public String stringValue() {
return data;
}
public Token asInstanceOfToken() {
return new Token(TokenKind.INSTANCEOF,startpos,endpos);
}
public Token asMatchesToken() {
return new Token(TokenKind.MATCHES,startpos,endpos);
}
public Token asBetweenToken() {
return new Token(TokenKind.BETWEEN,startpos,endpos);
}
}
|