/*
 * Copyright 2002-2013 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;

/**
 * Token Kinds.
 *
 * @author Andy Clement
 * @since 3.0
 */
enum TokenKind {

	// ordered by priority - operands first

	LITERAL_INT,

	LITERAL_LONG,

	LITERAL_HEXINT,

	LITERAL_HEXLONG,

	LITERAL_STRING,

	LITERAL_REAL,

	LITERAL_REAL_FLOAT,

	LPAREN("("),

	RPAREN(")"),

	COMMA(","),

	IDENTIFIER,

	COLON(":"),

	HASH("#"),

	RSQUARE("]"),

	LSQUARE("["),

	LCURLY("{"),

	RCURLY("}"),

	DOT("."),

	PLUS("+"),

	STAR("*"),

	MINUS("-"),

	SELECT_FIRST("^["),

	SELECT_LAST("$["),

	QMARK("?"),

	PROJECT("!["),

	DIV("/"),

	GE(">="),

	GT(">"),

	LE("<="),

	LT("<"),

	EQ("=="),

	NE("!="),

	MOD("%"),

	NOT("!"),

	ASSIGN("="),

	INSTANCEOF("instanceof"),

	MATCHES("matches"),

	BETWEEN("between"),

	SELECT("?["),

	POWER("^"),

	ELVIS("?:"),

	SAFE_NAVI("?."),

	BEAN_REF("@"),

	SYMBOLIC_OR("||"),

	SYMBOLIC_AND("&&"),

	INC("++"),

	DEC("--");


	char[] tokenChars;

	private boolean hasPayload; // is there more to this token than simply the kind


	private TokenKind(String tokenString) {
		this.tokenChars = tokenString.toCharArray();
		this.hasPayload = this.tokenChars.length==0;
	}

	private TokenKind() {
		this("");
	}


	@Override
	public String toString() {
		return this.name()+(this.tokenChars.length!=0?"("+new String(this.tokenChars)+")":"");
	}

	public boolean hasPayload() {
		return this.hasPayload;
	}

	public int getLength() {
		return this.tokenChars.length;
	}
}
