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/*
 * Copyright (C) 2004, 2005, 2006 Joe Walnes.
 * Copyright (C) 2006, 2007, 2008, 2009, 2011, 2013, 2016, 2017, 2019 XStream Committers.
 * All rights reserved.
 *
 * The software in this package is published under the terms of the BSD
 * style license a copy of which has been included with this distribution in
 * the LICENSE.txt file.
 * 
 * Created on 07. March 2004 by Joe Walnes
 */
package com.feilong.lib.xstream.core;

import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

import com.feilong.lib.xstream.converters.ConversionException;
import com.feilong.lib.xstream.converters.Converter;
import com.feilong.lib.xstream.converters.ConverterLookup;
import com.feilong.lib.xstream.converters.ConverterRegistry;
import com.feilong.lib.xstream.core.util.Cloneables;
import com.feilong.lib.xstream.core.util.PrioritizedList;
import com.feilong.lib.xstream.mapper.Mapper;

/**
 * The default implementation of converters lookup.
 * 
 * @author Joe Walnes
 * @author Jörg Schaible
 * @author Guilherme Silveira
 */
public class DefaultConverterLookup implements ConverterLookup,ConverterRegistry,Caching{

    private final PrioritizedList converters       = new PrioritizedList();

    private transient Map         typeToConverterMap;

    private Map                   serializationMap = null;

    public DefaultConverterLookup(){
        this(new HashMap());
    }

    /**
     * Constructs a DefaultConverterLookup with a provided map.
     *
     * @param map
     *            the map to use
     * @throws NullPointerException
     *             if map is null
     * @since 1.4.11
     */
    public DefaultConverterLookup(Map map){
        typeToConverterMap = map;
        typeToConverterMap.clear();
    }

    /**
     * @deprecated As of 1.3, use {@link #DefaultConverterLookup()}
     */
    @Deprecated
    public DefaultConverterLookup(Mapper mapper){
        this();
    }

    @Override
    public Converter lookupConverterForType(Class type){
        Converter cachedConverter = type != null ? (Converter) typeToConverterMap.get(type.getName()) : null;
        if (cachedConverter != null){
            return cachedConverter;
        }

        final Map errors = new LinkedHashMap();
        Iterator iterator = converters.iterator();
        while (iterator.hasNext()){
            Converter converter = (Converter) iterator.next();
            try{
                if (converter.canConvert(type)){
                    if (type != null){
                        typeToConverterMap.put(type.getName(), converter);
                    }
                    return converter;
                }
            }catch (final RuntimeException e){
                errors.put(converter.getClass().getName(), e.getMessage());
            }catch (final LinkageError e){
                errors.put(converter.getClass().getName(), e.getMessage());
            }
        }

        final ConversionException exception = new ConversionException(
                        errors.isEmpty() ? "No converter specified" : "No converter available");
        exception.add("type", type != null ? type.getName() : "null");
        iterator = errors.entrySet().iterator();
        while (iterator.hasNext()){
            final Map.Entry entry = (Map.Entry) iterator.next();
            exception.add("converter", entry.getKey().toString());
            exception.add("message", entry.getValue().toString());
        }
        throw exception;
    }

    @Override
    public void registerConverter(Converter converter,int priority){
        typeToConverterMap.clear();
        converters.add(converter, priority);
    }

    @Override
    public void flushCache(){
        typeToConverterMap.clear();
        Iterator iterator = converters.iterator();
        while (iterator.hasNext()){
            Converter converter = (Converter) iterator.next();
            if (converter instanceof Caching){
                ((Caching) converter).flushCache();
            }
        }
    }

    private Object writeReplace(){
        serializationMap = (Map) Cloneables.cloneIfPossible(typeToConverterMap);
        serializationMap.clear();
        return this;
    }

    private Object readResolve(){
        typeToConverterMap = serializationMap == null ? new HashMap() : serializationMap;
        serializationMap = null;
        return this;
    }
}