spring Token 源码
spring Token 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/standard/Token.java
/*
* Copyright 2002-2021 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
*
* https://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;
import org.springframework.lang.Nullable;
/**
* 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;
@Nullable
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
* (e.g. 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 startPos, int endPos) {
this(tokenKind, startPos, endPos);
this.data = new String(tokenData);
}
public TokenKind getKind() {
return this.kind;
}
public boolean isIdentifier() {
return (this.kind == TokenKind.IDENTIFIER);
}
public boolean isNumericRelationalOperator() {
return (this.kind == TokenKind.GT || this.kind == TokenKind.GE || this.kind == TokenKind.LT ||
this.kind == TokenKind.LE || this.kind==TokenKind.EQ || this.kind==TokenKind.NE);
}
public String stringValue() {
return (this.data != null ? this.data : "");
}
public Token asInstanceOfToken() {
return new Token(TokenKind.INSTANCEOF, this.startPos, this.endPos);
}
public Token asMatchesToken() {
return new Token(TokenKind.MATCHES, this.startPos, this.endPos);
}
public Token asBetweenToken() {
return new Token(TokenKind.BETWEEN, this.startPos, this.endPos);
}
@Override
public String toString() {
StringBuilder s = new StringBuilder();
s.append('[').append(this.kind.toString());
if (this.kind.hasPayload()) {
s.append(':').append(this.data);
}
s.append(']');
s.append('(').append(this.startPos).append(',').append(this.endPos).append(')');
return s.toString();
}
}
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