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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * 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.generallycloud.baseio.common;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;

public class StringUtil {
	
	private static String [] zeros;
	
	static{
		int max = 15;
		int i = 0;
		zeros = new String[max+1];
		zeros[0] = "";
		for(; i++ < max;){
			zeros[i] = zeros[i-1] + "0";
		}
	}
	
	public static boolean isNullOrBlank(String value){
		
		return value == null || value.length() == 0;
	}

	public static boolean hasLength(String text) {
		
		return text != null && text.length() > 0;
	}

	public static boolean hasText(String text) {
		return text != null && text.trim().length() > 0;
	}
	
	public static String getZeroString(int length){
		return zeros[length];
	}
	
	//FIXME 尽量使用decode取代new String()
	//see  java.lang.StringCoding.decode(Charset cs, byte[] ba, int off, int len)
	public static String decode(Charset charset,ByteBuffer buffer){
		
		CharBuffer cb = charset.decode(buffer);
		
		return cb.toString();
	}
}