spring XStreamMarshaller 源码
spring XStreamMarshaller 代码
文件路径：/spring-oxm/src/main/java/org/springframework/oxm/xstream/XStreamMarshaller.java
/*
* Copyright 2002-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.oxm.xstream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.lang.reflect.Constructor;
import java.util.List;
import java.util.Map;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.stream.StreamSource;
import com.thoughtworks.xstream.MarshallingStrategy;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.ConverterLookup;
import com.thoughtworks.xstream.converters.ConverterMatcher;
import com.thoughtworks.xstream.converters.ConverterRegistry;
import com.thoughtworks.xstream.converters.DataHolder;
import com.thoughtworks.xstream.converters.SingleValueConverter;
import com.thoughtworks.xstream.converters.reflection.ReflectionProvider;
import com.thoughtworks.xstream.core.ClassLoaderReference;
import com.thoughtworks.xstream.core.DefaultConverterLookup;
import com.thoughtworks.xstream.io.HierarchicalStreamDriver;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.StreamException;
import com.thoughtworks.xstream.io.naming.NameCoder;
import com.thoughtworks.xstream.io.xml.CompactWriter;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.DomReader;
import com.thoughtworks.xstream.io.xml.DomWriter;
import com.thoughtworks.xstream.io.xml.QNameMap;
import com.thoughtworks.xstream.io.xml.SaxWriter;
import com.thoughtworks.xstream.io.xml.StaxDriver;
import com.thoughtworks.xstream.io.xml.StaxReader;
import com.thoughtworks.xstream.io.xml.StaxWriter;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
import com.thoughtworks.xstream.mapper.CannotResolveClassException;
import com.thoughtworks.xstream.mapper.Mapper;
import com.thoughtworks.xstream.mapper.MapperWrapper;
import com.thoughtworks.xstream.security.ForbiddenClassException;
import com.thoughtworks.xstream.security.TypePermission;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.ext.LexicalHandler;
import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.lang.Nullable;
import org.springframework.oxm.MarshallingFailureException;
import org.springframework.oxm.UncategorizedMappingException;
import org.springframework.oxm.UnmarshallingFailureException;
import org.springframework.oxm.XmlMappingException;
import org.springframework.oxm.support.AbstractMarshaller;
import org.springframework.util.ClassUtils;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import org.springframework.util.function.SingletonSupplier;
import org.springframework.util.xml.StaxUtils;
/**
* Implementation of the {@code Marshaller} interface for XStream.
*
* <p>By default, XStream does not require any further configuration and can (un)marshal
* any class on the classpath. As such, it is <b>not recommended to use the
* {@code XStreamMarshaller} to unmarshal XML from external sources</b> (i.e. the Web),
* as this can result in <b>security vulnerabilities</b>. If you do use the
* {@code XStreamMarshaller} to unmarshal external XML, set the
* {@link #setSupportedClasses(Class[]) supportedClasses} and
* {@link #setConverters(ConverterMatcher[]) converters} properties (possibly using
* a {@link CatchAllConverter}) or override the {@link #customizeXStream(XStream)}
* method to make sure it only accepts the classes you want it to support.
*
* <p>Due to XStream's API, it is required to set the encoding used for writing to
* OutputStreams. It defaults to {@code UTF-8}.
*
* <p><b>NOTE:</b> XStream is an XML serialization library, not a data binding library.
* Therefore, it has limited namespace support. As such, it is rather unsuitable for
* usage within Web Services.
*
* <p>This marshaller requires XStream 1.4.7 or higher, as of Spring 5.2.17.
* Note that {@link XStream} construction has been reworked in 4.0, with the
* stream driver and the class loader getting passed into XStream itself now.
*
* <p>As of Spring Framework 6.0, the default {@link HierarchicalStreamDriver} is
* a {@link DomDriver} that uses the configured {@linkplain #setEncoding(String)
* encoding} and {@link #setNameCoder(NameCoder) NameCoder}. The driver can be
* changed via {@link #setStreamDriver(HierarchicalStreamDriver)}.
*
* @author Peter Meijer
* @author Arjen Poutsma
* @author Juergen Hoeller
* @author Sam Brannen
* @since 3.0
*/
public class XStreamMarshaller extends AbstractMarshaller implements BeanClassLoaderAware, InitializingBean {
/**
* The default encoding used for stream access: UTF-8.
*/
public static final String DEFAULT_ENCODING = "UTF-8";
@Nullable
private ReflectionProvider reflectionProvider;
@Nullable
private HierarchicalStreamDriver streamDriver;
@Nullable
private HierarchicalStreamDriver defaultDriver;
@Nullable
private Mapper mapper;
@Nullable
private Class<? extends MapperWrapper>[] mapperWrappers;
private ConverterLookup converterLookup = new DefaultConverterLookup();
private ConverterRegistry converterRegistry = (ConverterRegistry) this.converterLookup;
@Nullable
private ConverterMatcher[] converters;
@Nullable
private TypePermission[] typePermissions;
@Nullable
private MarshallingStrategy marshallingStrategy;
@Nullable
private Integer mode;
@Nullable
private Map<String, ?> aliases;
@Nullable
private Map<String, ?> aliasesByType;
@Nullable
private Map<String, String> fieldAliases;
@Nullable
private Class<?>[] useAttributeForTypes;
@Nullable
private Map<?, ?> useAttributeFor;
@Nullable
private Map<Class<?>, String> implicitCollections;
@Nullable
private Map<Class<?>, String> omittedFields;
@Nullable
private Class<?>[] annotatedClasses;
private boolean autodetectAnnotations;
private String encoding = DEFAULT_ENCODING;
private NameCoder nameCoder = new XmlFriendlyNameCoder();
@Nullable
private Class<?>[] supportedClasses;
@Nullable
private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();
private final SingletonSupplier<XStream> xstream = SingletonSupplier.of(this::buildXStream);
/**
* Set a custom XStream {@link ReflectionProvider} to use.
* @since 4.0
*/
public void setReflectionProvider(ReflectionProvider reflectionProvider) {
this.reflectionProvider = reflectionProvider;
}
/**
* Set an XStream {@link HierarchicalStreamDriver} to be used for readers and writers.
* <p>As of Spring 4.0, this stream driver will also be passed to the {@link XStream}
* constructor and therefore used by streaming-related native API methods themselves.
*/
public void setStreamDriver(HierarchicalStreamDriver streamDriver) {
this.streamDriver = streamDriver;
this.defaultDriver = streamDriver;
}
private HierarchicalStreamDriver getDefaultDriver() {
if (this.defaultDriver == null) {
this.defaultDriver = new DomDriver(this.encoding, this.nameCoder);
}
return this.defaultDriver;
}
/**
* Set a custom XStream {@link Mapper} to use.
* @since 4.0
*/
public void setMapper(Mapper mapper) {
this.mapper = mapper;
}
/**
* Set one or more custom XStream {@link MapperWrapper} classes.
* Each of those classes needs to have a constructor with a single argument
* of type {@link Mapper} or {@link MapperWrapper}.
* @since 4.0
*/
@SuppressWarnings("unchecked")
public void setMapperWrappers(Class<? extends MapperWrapper>... mapperWrappers) {
this.mapperWrappers = mapperWrappers;
}
/**
* Set a custom XStream {@link ConverterLookup} to use.
* Also used as {@link ConverterRegistry} if the given reference implements it as well.
* @since 4.0
* @see DefaultConverterLookup
*/
public void setConverterLookup(ConverterLookup converterLookup) {
this.converterLookup = converterLookup;
if (converterLookup instanceof ConverterRegistry registry) {
this.converterRegistry = registry;
}
}
/**
* Set a custom XStream {@link ConverterRegistry} to use.
* @since 4.0
* @see #setConverterLookup
* @see DefaultConverterLookup
*/
public void setConverterRegistry(ConverterRegistry converterRegistry) {
this.converterRegistry = converterRegistry;
}
/**
* Set the {@code Converters} or {@code SingleValueConverters} to be registered
* with the {@code XStream} instance.
* @see Converter
* @see SingleValueConverter
*/
public void setConverters(ConverterMatcher... converters) {
this.converters = converters;
}
/**
* Set XStream type permissions such as
* {@link com.thoughtworks.xstream.security.AnyTypePermission},
* {@link com.thoughtworks.xstream.security.ExplicitTypePermission} etc,
* as an alternative to overriding the {@link #customizeXStream} method.
* <p>Note: As of XStream 1.4.18, the default type permissions are
* restricted to well-known core JDK types. For any custom types,
* explicit type permissions need to be registered.
* @since 5.2.17
*/
public void setTypePermissions(TypePermission... typePermissions) {
this.typePermissions = typePermissions;
}
/**
* Set a custom XStream {@link MarshallingStrategy} to use.
* @since 4.0
*/
public void setMarshallingStrategy(MarshallingStrategy marshallingStrategy) {
this.marshallingStrategy = marshallingStrategy;
}
/**
* Set the XStream mode to use.
* @see XStream#ID_REFERENCES
* @see XStream#NO_REFERENCES
*/
public void setMode(int mode) {
this.mode = mode;
}
/**
* Set the alias/type map, consisting of string aliases mapped to classes.
* <p>Keys are aliases; values are either {@code Class} instances, or String class names.
* @see XStream#alias(String, Class)
*/
public void setAliases(Map<String, ?> aliases) {
this.aliases = aliases;
}
/**
* Set the <em>aliases by type</em> map, consisting of string aliases mapped to classes.
* <p>Any class that is assignable to this type will be aliased to the same name.
* Keys are aliases; values are either {@code Class} instances, or String class names.
* @see XStream#aliasType(String, Class)
*/
public void setAliasesByType(Map<String, ?> aliasesByType) {
this.aliasesByType = aliasesByType;
}
/**
* Set the field alias/type map, consisting of field names.
* @see XStream#aliasField(String, Class, String)
*/
public void setFieldAliases(Map<String, String> fieldAliases) {
this.fieldAliases = fieldAliases;
}
/**
* Set types to use XML attributes for.
* @see XStream#useAttributeFor(Class)
*/
public void setUseAttributeForTypes(Class<?>... useAttributeForTypes) {
this.useAttributeForTypes = useAttributeForTypes;
}
/**
* Set the types to use XML attributes for. The given map can contain
* either {@code <String, Class>} pairs, in which case
* {@link XStream#useAttributeFor(String, Class)} is called.
* Alternatively, the map can contain {@code <Class, String>}
* or {@code <Class, List<String>>} pairs, which results
* in {@link XStream#useAttributeFor(Class, String)} calls.
*/
public void setUseAttributeFor(Map<?, ?> useAttributeFor) {
this.useAttributeFor = useAttributeFor;
}
/**
* Specify implicit collection fields, as a Map consisting of {@code Class} instances
* mapped to comma separated collection field names.
* @see XStream#addImplicitCollection(Class, String)
*/
public void setImplicitCollections(Map<Class<?>, String> implicitCollections) {
this.implicitCollections = implicitCollections;
}
/**
* Specify omitted fields, as a Map consisting of {@code Class} instances
* mapped to comma separated field names.
* @see XStream#omitField(Class, String)
*/
public void setOmittedFields(Map<Class<?>, String> omittedFields) {
this.omittedFields = omittedFields;
}
/**
* Set annotated classes for which aliases will be read from class-level annotation metadata.
* @see XStream#processAnnotations(Class[])
*/
public void setAnnotatedClasses(Class<?>... annotatedClasses) {
this.annotatedClasses = annotatedClasses;
}
/**
* Activate XStream's autodetection mode.
* <p><b>Note</b>: Autodetection implies that the XStream instance is being configured while
* it is processing the XML streams, and thus introduces a potential concurrency problem.
* @see XStream#autodetectAnnotations(boolean)
*/
public void setAutodetectAnnotations(boolean autodetectAnnotations) {
this.autodetectAnnotations = autodetectAnnotations;
}
/**
* Set the encoding to be used for stream access.
* @see #DEFAULT_ENCODING
*/
public void setEncoding(String encoding) {
this.encoding = encoding;
}
@Override
protected String getDefaultEncoding() {
return this.encoding;
}
/**
* Set a custom XStream {@link NameCoder} to use.
* The default is an {@link XmlFriendlyNameCoder}.
* @since 4.0.4
*/
public void setNameCoder(NameCoder nameCoder) {
this.nameCoder = nameCoder;
}
/**
* Set the classes supported by this marshaller.
* <p>If this property is empty (the default), all classes are supported.
* @see #supports(Class)
*/
public void setSupportedClasses(Class<?>... supportedClasses) {
this.supportedClasses = supportedClasses;
}
@Override
public void setBeanClassLoader(ClassLoader classLoader) {
this.beanClassLoader = classLoader;
}
@Override
public void afterPropertiesSet() {
// no-op due to use of SingletonSupplier for the XStream field
}
/**
* Build the native XStream delegate to be used by this marshaller,
* delegating to {@link #constructXStream}, {@link #configureXStream},
* and {@link #customizeXStream}.
*/
protected XStream buildXStream() {
XStream xstream = constructXStream();
configureXStream(xstream);
customizeXStream(xstream);
return xstream;
}
/**
* Construct an XStream instance, either using one of the
* standard constructors or creating a custom subclass.
* @return the {@code XStream} instance
*/
protected XStream constructXStream() {
return new XStream(this.reflectionProvider, getDefaultDriver(), new ClassLoaderReference(this.beanClassLoader),
this.mapper, this.converterLookup, this.converterRegistry) {
@Override
protected MapperWrapper wrapMapper(MapperWrapper next) {
MapperWrapper mapperToWrap = next;
if (mapperWrappers != null) {
for (Class<? extends MapperWrapper> mapperWrapper : mapperWrappers) {
Constructor<? extends MapperWrapper> ctor;
try {
ctor = mapperWrapper.getConstructor(Mapper.class);
}
catch (NoSuchMethodException ex) {
try {
ctor = mapperWrapper.getConstructor(MapperWrapper.class);
}
catch (NoSuchMethodException ex2) {
throw new IllegalStateException("No appropriate MapperWrapper constructor found: " + mapperWrapper);
}
}
try {
mapperToWrap = ctor.newInstance(mapperToWrap);
}
catch (Throwable ex) {
throw new IllegalStateException("Failed to construct MapperWrapper: " + mapperWrapper);
}
}
}
return mapperToWrap;
}
};
}
/**
* Configure the XStream instance with this marshaller's bean properties.
* @param xstream the {@code XStream} instance
*/
protected void configureXStream(XStream xstream) {
if (this.converters != null) {
for (int i = 0; i < this.converters.length; i++) {
if (this.converters[i] instanceof Converter converter) {
xstream.registerConverter(converter, i);
}
else if (this.converters[i] instanceof SingleValueConverter converter) {
xstream.registerConverter(converter, i);
}
else {
throw new IllegalArgumentException("Invalid ConverterMatcher [" + this.converters[i] + "]");
}
}
}
if (this.typePermissions != null) {
for (TypePermission permission : this.typePermissions) {
xstream.addPermission(permission);
}
}
if (this.marshallingStrategy != null) {
xstream.setMarshallingStrategy(this.marshallingStrategy);
}
if (this.mode != null) {
xstream.setMode(this.mode);
}
try {
if (this.aliases != null) {
Map<String, Class<?>> classMap = toClassMap(this.aliases);
classMap.forEach(xstream::alias);
}
if (this.aliasesByType != null) {
Map<String, Class<?>> classMap = toClassMap(this.aliasesByType);
classMap.forEach(xstream::aliasType);
}
if (this.fieldAliases != null) {
for (Map.Entry<String, String> entry : this.fieldAliases.entrySet()) {
String alias = entry.getValue();
String field = entry.getKey();
int idx = field.lastIndexOf('.');
if (idx != -1) {
String className = field.substring(0, idx);
Class<?> clazz = ClassUtils.forName(className, this.beanClassLoader);
String fieldName = field.substring(idx + 1);
xstream.aliasField(alias, clazz, fieldName);
}
else {
throw new IllegalArgumentException("Field name [" + field + "] does not contain '.'");
}
}
}
}
catch (ClassNotFoundException ex) {
throw new IllegalStateException("Failed to load specified alias class", ex);
}
if (this.useAttributeForTypes != null) {
for (Class<?> type : this.useAttributeForTypes) {
xstream.useAttributeFor(type);
}
}
if (this.useAttributeFor != null) {
for (Map.Entry<?, ?> entry : this.useAttributeFor.entrySet()) {
if (entry.getKey() instanceof String key) {
if (entry.getValue() instanceof Class<?> clazz) {
xstream.useAttributeFor(key, clazz);
}
else {
throw new IllegalArgumentException(
"'useAttributesFor' takes Map<String, Class> when using a map key of type String");
}
}
else if (entry.getKey() instanceof Class<?> key) {
if (entry.getValue() instanceof String value) {
xstream.useAttributeFor(key, value);
}
else if (entry.getValue() instanceof List<?> listValue) {
for (Object element : listValue) {
if (element instanceof String value) {
xstream.useAttributeFor(key, value);
}
}
}
else {
throw new IllegalArgumentException("'useAttributesFor' property takes either Map<Class, String> " +
"or Map<Class, List<String>> when using a map key of type Class");
}
}
else {
throw new IllegalArgumentException(
"'useAttributesFor' property takes either a map key of type String or Class");
}
}
}
if (this.implicitCollections != null) {
this.implicitCollections.forEach((key, fields) -> {
String[] collectionFields = StringUtils.commaDelimitedListToStringArray(fields);
for (String collectionField : collectionFields) {
xstream.addImplicitCollection(key, collectionField);
}
});
}
if (this.omittedFields != null) {
this.omittedFields.forEach((key, value) -> {
String[] fields = StringUtils.commaDelimitedListToStringArray(value);
for (String field : fields) {
xstream.omitField(key, field);
}
});
}
if (this.annotatedClasses != null) {
xstream.processAnnotations(this.annotatedClasses);
}
if (this.autodetectAnnotations) {
xstream.autodetectAnnotations(true);
}
}
private Map<String, Class<?>> toClassMap(Map<String, ?> map) throws ClassNotFoundException {
Map<String, Class<?>> result = CollectionUtils.newLinkedHashMap(map.size());
for (Map.Entry<String, ?> entry : map.entrySet()) {
String key = entry.getKey();
Object value = entry.getValue();
Class<?> type;
if (value instanceof Class<?> clazz) {
type = clazz;
}
else if (value instanceof String className) {
type = ClassUtils.forName(className, this.beanClassLoader);
}
else {
throw new IllegalArgumentException("Unknown value [" + value + "] - expected String or Class");
}
result.put(key, type);
}
return result;
}
/**
* Template to allow for customizing the given {@link XStream}.
* <p>The default implementation is empty.
* @param xstream the {@code XStream} instance
*/
protected void customizeXStream(XStream xstream) {
}
/**
* Return the native XStream delegate used by this marshaller.
* <p><b>NOTE: This method has been marked as final as of Spring 4.0.</b>
* It can be used to access the fully configured XStream for marshalling
* but not configuration purposes anymore.
* <p>As of Spring Framework 5.1.16, creation of the {@link XStream} instance
* returned by this method is thread safe.
*/
public final XStream getXStream() {
return this.xstream.obtain();
}
@Override
public boolean supports(Class<?> clazz) {
if (ObjectUtils.isEmpty(this.supportedClasses)) {
return true;
}
else {
for (Class<?> supportedClass : this.supportedClasses) {
if (supportedClass.isAssignableFrom(clazz)) {
return true;
}
}
return false;
}
}
// Marshalling
@Override
protected void marshalDomNode(Object graph, Node node) throws XmlMappingException {
HierarchicalStreamWriter streamWriter;
if (node instanceof Document document) {
streamWriter = new DomWriter(document, this.nameCoder);
}
else if (node instanceof Element element) {
streamWriter = new DomWriter(element, node.getOwnerDocument(), this.nameCoder);
}
else {
throw new IllegalArgumentException("DOMResult contains neither Document nor Element");
}
doMarshal(graph, streamWriter, null);
}
@Override
protected void marshalXmlEventWriter(Object graph, XMLEventWriter eventWriter) throws XmlMappingException {
ContentHandler contentHandler = StaxUtils.createContentHandler(eventWriter);
LexicalHandler lexicalHandler = (contentHandler instanceof LexicalHandler handler ? handler : null);
marshalSaxHandlers(graph, contentHandler, lexicalHandler);
}
@Override
protected void marshalXmlStreamWriter(Object graph, XMLStreamWriter streamWriter) throws XmlMappingException {
try {
StaxWriter writer;
if (this.streamDriver instanceof StaxDriver staxDriver) {
writer = staxDriver.createStaxWriter(streamWriter);
}
else {
writer = new StaxWriter(new QNameMap(), streamWriter, this.nameCoder);
}
doMarshal(graph, writer, null);
}
catch (XMLStreamException ex) {
throw convertXStreamException(ex, true);
}
}
@Override
protected void marshalSaxHandlers(Object graph, ContentHandler contentHandler, @Nullable LexicalHandler lexicalHandler)
throws XmlMappingException {
SaxWriter saxWriter = new SaxWriter(this.nameCoder);
saxWriter.setContentHandler(contentHandler);
doMarshal(graph, saxWriter, null);
}
@Override
public void marshalOutputStream(Object graph, OutputStream outputStream) throws XmlMappingException, IOException {
marshalOutputStream(graph, outputStream, null);
}
public void marshalOutputStream(Object graph, OutputStream outputStream, @Nullable DataHolder dataHolder)
throws XmlMappingException, IOException {
if (this.streamDriver != null) {
doMarshal(graph, this.streamDriver.createWriter(outputStream), dataHolder);
}
else {
marshalWriter(graph, new OutputStreamWriter(outputStream, this.encoding), dataHolder);
}
}
@Override
public void marshalWriter(Object graph, Writer writer) throws XmlMappingException, IOException {
marshalWriter(graph, writer, null);
}
public void marshalWriter(Object graph, Writer writer, @Nullable DataHolder dataHolder)
throws XmlMappingException, IOException {
if (this.streamDriver != null) {
doMarshal(graph, this.streamDriver.createWriter(writer), dataHolder);
}
else {
doMarshal(graph, new CompactWriter(writer), dataHolder);
}
}
/**
* Marshals the given graph to the given XStream HierarchicalStreamWriter.
* Converts exceptions using {@link #convertXStreamException}.
*/
private void doMarshal(Object graph, HierarchicalStreamWriter streamWriter, @Nullable DataHolder dataHolder) {
try {
getXStream().marshal(graph, streamWriter, dataHolder);
}
catch (Exception ex) {
throw convertXStreamException(ex, true);
}
finally {
try {
streamWriter.flush();
}
catch (Exception ex) {
logger.debug("Could not flush HierarchicalStreamWriter", ex);
}
}
}
// Unmarshalling
@Override
protected Object unmarshalStreamSource(StreamSource streamSource) throws XmlMappingException, IOException {
if (streamSource.getInputStream() != null) {
return unmarshalInputStream(streamSource.getInputStream());
}
else if (streamSource.getReader() != null) {
return unmarshalReader(streamSource.getReader());
}
else {
throw new IllegalArgumentException("StreamSource contains neither InputStream nor Reader");
}
}
@Override
protected Object unmarshalDomNode(Node node) throws XmlMappingException {
HierarchicalStreamReader streamReader;
if (node instanceof Document document) {
streamReader = new DomReader(document, this.nameCoder);
}
else if (node instanceof Element element) {
streamReader = new DomReader(element, this.nameCoder);
}
else {
throw new IllegalArgumentException("DOMSource contains neither Document nor Element");
}
return doUnmarshal(streamReader, null);
}
@Override
protected Object unmarshalXmlEventReader(XMLEventReader eventReader) throws XmlMappingException {
try {
XMLStreamReader streamReader = StaxUtils.createEventStreamReader(eventReader);
return unmarshalXmlStreamReader(streamReader);
}
catch (XMLStreamException ex) {
throw convertXStreamException(ex, false);
}
}
@Override
protected Object unmarshalXmlStreamReader(XMLStreamReader streamReader) throws XmlMappingException {
return doUnmarshal(new StaxReader(new QNameMap(), streamReader, this.nameCoder), null);
}
@Override
protected Object unmarshalSaxReader(XMLReader xmlReader, InputSource inputSource)
throws XmlMappingException, IOException {
throw new UnsupportedOperationException(
"XStreamMarshaller does not support unmarshalling using SAX XMLReaders");
}
@Override
public Object unmarshalInputStream(InputStream inputStream) throws XmlMappingException, IOException {
return unmarshalInputStream(inputStream, null);
}
public Object unmarshalInputStream(InputStream inputStream, @Nullable DataHolder dataHolder) throws XmlMappingException, IOException {
if (this.streamDriver != null) {
return doUnmarshal(this.streamDriver.createReader(inputStream), dataHolder);
}
else {
return unmarshalReader(new InputStreamReader(inputStream, this.encoding), dataHolder);
}
}
@Override
public Object unmarshalReader(Reader reader) throws XmlMappingException, IOException {
return unmarshalReader(reader, null);
}
public Object unmarshalReader(Reader reader, @Nullable DataHolder dataHolder) throws XmlMappingException, IOException {
return doUnmarshal(getDefaultDriver().createReader(reader), dataHolder);
}
/**
* Unmarshals the given graph to the given XStream HierarchicalStreamWriter.
* Converts exceptions using {@link #convertXStreamException}.
*/
private Object doUnmarshal(HierarchicalStreamReader streamReader, @Nullable DataHolder dataHolder) {
try {
return getXStream().unmarshal(streamReader, null, dataHolder);
}
catch (Exception ex) {
throw convertXStreamException(ex, false);
}
}
/**
* Convert the given XStream exception to an appropriate exception from the
* {@code org.springframework.oxm} hierarchy.
* <p>A boolean flag is used to indicate whether this exception occurs during marshalling or
* unmarshalling, since XStream itself does not make this distinction in its exception hierarchy.
* @param ex the XStream exception that occurred
* @param marshalling indicates whether the exception occurs during marshalling ({@code true}),
* or unmarshalling ({@code false})
* @return the corresponding {@code XmlMappingException}
*/
protected XmlMappingException convertXStreamException(Exception ex, boolean marshalling) {
if (ex instanceof StreamException || ex instanceof CannotResolveClassException ||
ex instanceof ForbiddenClassException || ex instanceof ConversionException) {
if (marshalling) {
return new MarshallingFailureException("XStream marshalling exception", ex);
}
else {
return new UnmarshallingFailureException("XStream unmarshalling exception", ex);
}
}
else {
// fallback
return new UncategorizedMappingException("Unknown XStream exception", ex);
}
}
}
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