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/*
 * Copyright (C) 2015-2018 XinZhenfeng 
 * 
 * This file is part of prac, 
 * prac is free software released under the MIT license.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, sublicense, and/or sell copies of the Software, and to 
 * permit persons to whom the Software is furnished to do so, subject to 
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */

package ff.prac.util;

import java.util.ArrayDeque;

/**
 * join multi substring into one or parts a single string into substrings
 *
 */
public final class Parts {

	private char tag = '|';
	private char esc = ':';
	
	/**
	 * default separator |

	 * default escaping :
	 */
	public Parts() {
		
	}
	
	/**
	 * constructor
	 * @param tag separator char
	 * @param esc escaping char
	 */
	public Parts(char tag, char esc) {
		if(tag!=esc) {
			this.tag = tag;
			this.esc = esc;			
		} else {
			throw new RuntimeException("same charactor for tag and esc");
		}
	}

	public boolean isJoined(String str) {
		return str!=null && str.length()>0 && str.charAt(0)==this.tag;
	}
	
	public String join(String[] str) {
		if(str==null) {
			return "";
		}
		Object[] ooo = new Object[str.length];
		for(int i=0; i part(String st) {
		
		ArrayDeque list = new ArrayDeque();
		
		if(st==null || st.charAt(0)!=this.tag) {
			return list;
		}

		StringBuilder buf = new StringBuilder();
		int idx = 1;
		while( idx < st.length() ) {
			char c = st.charAt(idx);
			if(c==this.esc) {
				buf.append(st.charAt(idx+1));
				idx += 2;
			} else if(c==this.tag) {
				list.add(buf.toString());
				buf = new StringBuilder();
				idx++;
			} else {
				buf.append(c);
				idx++;
			}
		}
		list.add(buf.toString());
		return list;
	}
}