/*
 * This software is distributed under following license based on modified BSD
 * style license.
 * ----------------------------------------------------------------------
 * 
 * Copyright 2009 The Nimbus2 Project. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE NIMBUS PROJECT ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL THE NIMBUS PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of the Nimbus2 Project.
 */
package jp.ossc.nimbus.service.writer;

import java.util.*;

/**
 * 繰り返し記述要素。<p>
 *
 * @author M.Takata
 */
public class IterateWritableElement implements WritableElement, java.io.Serializable {
    
    private static final long serialVersionUID = 7850080678707274931L;
    
    protected Object key;
    
    protected List<Object> elements;
    
    /**
     * 空のインスタンスを生成する。<p>
     */
    public IterateWritableElement(){
    }
    
    /**
     * インスタンスを生成する。<p>
     *
     * @param key キー
     */
    public IterateWritableElement(Object key){
        this.key = key;
    }
    
    // WritableElementのJavaDoc
    public void setKey(Object key){
        this.key = key;
    }
    
    // WritableElementのJavaDoc
    public Object getKey(){
        return key == null ? this : key;
    }
    
    // WritableElementのJavaDoc
    @SuppressWarnings("unchecked")
    public void setValue(Object val){
        elements = (List<Object>)val;
    }
    
    // WritableElementのJavaDoc
    public Object getValue(){
        return elements;
    }
    
    /**
     * 要素を追加する。<p>
     *
     * @param elem 要素
     */
    public void addElement(WritableElement elem){
        if(elements == null){
            elements = new ArrayList<Object>();
        }
        elements.add(elem);
    }
    
    /**
     * 要素のリストを取得する。<p>
     *
     * @return WritableElementのList
     */
    public List<Object> getElements(){
        return elements;
    }
    
    /**
     * この要素が持つ繰り返し要素の値をそのまま文字列にして、繰り返し分連結して取得する。<p>
     * 
     * @return 文字列
     */
    public String toString(){
        if(elements == null || elements.size() == 0){
            return null;
        }
        final StringBuilder buf = new StringBuilder();
        for(int i = 0, max = elements.size(); i < max; i++){
            buf.append(elements.get(i));
        }
        return buf.toString();
    }
    
    /**
     * この要素が持つ繰り返し要素のオブジェクトをリストに詰めて取得する。<p>
     * 
     * @return この要素が持つ繰り返し要素のオブジェクトを詰めたリスト
     */
    public Object toObject(){
        if(elements == null || elements.size() == 0){
            return null;
        }
        final List<Object> list = new ArrayList<Object>();
        for(int i = 0, max = elements.size(); i < max; i++){
            list.add(((WritableElement)elements.get(i)).getValue());
        }
        return list;
    }
}