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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

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/*
 * Copyright (C) 2004 Joe Walnes.
 * Copyright (C) 2006, 2007, 2013, 2018 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 29. May 2004 by Joe Walnes
 */
package com.feilong.lib.xstream.converters.extended;

import com.feilong.lib.xstream.converters.Converter;
import com.feilong.lib.xstream.converters.ConverterLookup;
import com.feilong.lib.xstream.converters.MarshallingContext;
import com.feilong.lib.xstream.converters.UnmarshallingContext;
import com.feilong.lib.xstream.io.HierarchicalStreamReader;
import com.feilong.lib.xstream.io.HierarchicalStreamWriter;

/**
 * Converter for Throwable (and Exception) that retains stack trace.
 *
 * @author B. K. Oxley (binkley)
 * @author Joe Walnes
 * @author Jörg Schaible
 */
public class ThrowableConverter implements Converter{

    private Converter             defaultConverter;

    private final ConverterLookup lookup;

    /**
     * @deprecated As of 1.4.5 use {@link #ThrowableConverter(ConverterLookup)}
     */
    @Deprecated
    public ThrowableConverter(Converter defaultConverter){
        this.defaultConverter = defaultConverter;
        lookup = null;
    }

    /**
     * @since 1.4.5
     */
    public ThrowableConverter(ConverterLookup lookup){
        this.lookup = lookup;
    }

    @Override
    public boolean canConvert(final Class type){
        return type != null && Throwable.class.isAssignableFrom(type);
    }

    @Override
    public void marshal(Object source,HierarchicalStreamWriter writer,MarshallingContext context){
        Throwable throwable = (Throwable) source;
        if (throwable.getCause() == null){
            try{
                throwable.initCause(null);
            }catch (IllegalStateException e){
                // ignore, initCause failed, cause was already set
            }
        }
        throwable.getStackTrace(); // Force stackTrace field to be lazy loaded by special JVM native witchcraft (outside our control).
        getConverter().marshal(throwable, writer, context);
    }

    private Converter getConverter(){
        return defaultConverter != null ? defaultConverter : lookup.lookupConverterForType(Object.class);
    }

    @Override
    public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context){
        return getConverter().unmarshal(reader, context);
    }
}