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the jfinal enjoy plugin for normal java program to use sql management function.

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/**
 * Copyright (c) 2011-2017, James Zhan 詹波 ([email protected]).
 *
 * 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 com.jfinal.template.stat;

/**
 * CharTable 空间换时间优化字符判断性能
 * 负值参数强转 char 会自动变正值，无需判断负值数组下标
 * isLetter(EOF) 不会下标越界
 */
public class CharTable {
	
	private static final char[] letterChars = buildLetterChars();
	private static final char[] letterOrDigitChars = buildLetterOrDigitChars();
	private static final char[] exprChars = buildExprChars();
	private static final char NULL = 0;
	private static final char SIZE = 128;
	private CharTable(){}
	
	private static char[] createCharArray() {
		char[] ret = new char[SIZE];
		for (char i=0; i= '0' && c <= '9';
	}
	
	public static boolean isBlank(char c) {
		return c == ' ' || c == '\t';								// \t\r\u000C
	}
	
	public static boolean isBlankOrLineFeed(char c) {
		return c == ' ' || c == '\t' || c == '\r' || c == '\n';		// \t\r\n\u000C
	}
	
	public static boolean isHexadecimalDigit(char c) {
		return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
	}
	
	public static boolean isOctalDigit(char c) {
		return c >= '0' && c <= '7';
	}
}