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Common and utility library for the Service Grid Server Software and java web services.
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/*
 * $Id: DynamicBindingUtil.java 1143 2014-02-13 01:18:48Z t-nakaguchi $
 *
 * This is a program for Language Grid Core Node. This combines multiple language resources and provides composite language services.
 * Copyright (C) 2005-2008 NICT Language Grid Project.
 *
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation, either version 2.1 of the License, or (at 
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this program. If not, see .
 */
package jp.go.nict.langrid.commons.cs.binding;

import java.text.ParseException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import jp.go.nict.langrid.commons.codec.URLCodec;
import jp.go.nict.langrid.commons.lang.StringUtil;
import jp.go.nict.langrid.commons.transformer.TransformationException;
import jp.go.nict.langrid.commons.transformer.Transformer;
import jp.go.nict.langrid.commons.util.CollectionUtil;
import jp.go.nict.langrid.commons.util.Pair;
import jp.go.nict.langrid.repackaged.net.arnx.jsonic.JSON;
import jp.go.nict.langrid.repackaged.net.arnx.jsonic.JSONException;

/**
 * 
 * 
 * @author $Author: t-nakaguchi $
 * @version $Revision: 1143 $
 */
public class DynamicBindingUtil {
	/**
	 * 
	 * 
	 */
	public static String encodeDefaults(Map bindings){
		return StringUtil.join(
				CollectionUtil
					.collect(bindings.entrySet(), defaultBindingToString)
					.toArray(new String[]{})
				, ",");
	}

	/**
	 * 
	 * 
	 */
	public static Map decodeDefaults(String value){
		return decodeMappings(value, stringToDefaultBinding
				, new HashMap());
	}

	/**
	 * 
	 */
	public static String encodeOverrides(Map> bindings){
		return StringUtil.join(
				CollectionUtil
					.collect(filter(bindings).entrySet(), bindingOverrideToString)
					.toArray(new String[]{})
				, ",");
	}

	private static Map> filter(Map> map){
		Iterator>> i = map.entrySet().iterator();
		while(i.hasNext()){
			if(i.next().getValue().size() == 0){
				i.remove();
			}
		}
		return map;
	}

	/**
	 * 
	 * 
	 */
	public static Map> decodeOverrides(
			String value){
		Map> mappings = new HashMap>();
		for(String line : value.split(",")){
			String[] values = line.split("@");
			if(values.length != 2) continue;
			String[] values2 = values[0].split(":");
			if(values2.length != 2) continue;
			String wfId = values[1];
			String sourceId = values2[0];
			String dstId = URLCodec.decode(values2[1]);
			Map b = mappings.get(wfId);
			if(b == null){
				b = new HashMap();
				mappings.put(wfId, b);
			}
			b.put(sourceId, dstId);
		}
		return mappings;
	}

	/**
	 * 
	 * 
	 */
	public static String encodeTree(Collection value){
		return JSON.encode(value);
	}

	/**
	 * 
	 * 
	 */
	public static String encodeTree(Collection value
			, int indentFactor){
		return JSON.encode(value, true);
	}

	/**
	 * 
	 * 
	 */
	@SuppressWarnings("serial")
	public static Collection decodeTree(String value)
	throws ParseException
	{
		try{
			return JSON.decode(
					value, new ArrayList(){}.getClass().getGenericSuperclass()
					);
		} catch(JSONException e){
			throw new ParseException(e.getMessage(), -1);
		}
	}

	/**
	 * 
	 * 
	 */
	private static  Map decodeMappings(String value
			, Transformer> transformer, Map map)
	{
		for(String line : value.split(",")){
			Pair v = transformer.transform(line);
			if(v != null){
				map.put(v.getFirst(), v.getSecond());
			}
		}
		return map;
	}

	private static Transformer, String> defaultBindingToString =
		new Transformer, String>(){
			public String transform(Entry value)
					throws TransformationException {
				return value.getKey() + ":" + URLCodec.encode(value.getValue());
			}
		};

	private static Transformer> stringToDefaultBinding =
		new Transformer>(){
			public Pair transform(String value)
					throws TransformationException {
				String[] values = value.split(":");
				if(values.length != 2){
					throw new TransformationException(
							"value format is invalid. \"" + value + "\""
							);		
				}
				return Pair.create(values[0], URLCodec.decode(values[1]));
			}
		};

	private static Transformer>, String> bindingOverrideToString =
		new Transformer>, String>(){
			public String transform(Map.Entry> value)
					throws TransformationException {
				return StringUtil.join(
						CollectionUtil.collect(value.getValue().entrySet()
								, new BindingOverrideEntryToString(value.getKey())
						).toArray(new String[]{})
						, ","
						);
			}
		};
	private static class BindingOverrideEntryToString
	implements Transformer, String>{
		/**
		 * 
		 * 
		 */
		public BindingOverrideEntryToString(String serviceId){
			this.serviceId = serviceId;
		}
		public String transform(Entry value)
				throws TransformationException {
			return value.getKey()
			+ ":" + URLCodec.encode(value.getValue())
			+ "@" + serviceId;
		}
		private String serviceId;
	}
}