/*
* 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.thoughtworks.xstream.converters.extended;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.ConverterLookup;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
/**
* Converter for Throwable (and Exception) that retains stack trace.
*
* @author <a href="mailto:boxley@thoughtworks.com">B. K. Oxley (binkley)</a>
* @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)}
*/
public ThrowableConverter(Converter defaultConverter) {
this.defaultConverter = defaultConverter;
lookup = null;
}
/**
* @since 1.4.5
*/
public ThrowableConverter(ConverterLookup lookup) {
this.lookup = lookup;
}
public boolean canConvert(final Class type) {
return type != null && Throwable.class.isAssignableFrom(type);
}
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);
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
return getConverter().unmarshal(reader, context);
}
}