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POSerialization third-party classes with Simple XML (org.simpleframework.xml)
 

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  1. POSerialization third-party classes with Simple XML (org.simpleframework.xml)
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    <p>I have decided to use <a href="http://simple.sourceforge.net/" rel="noreferrer">Simple XML serialization</a> and was stucked with basic problem. I am trying to serialize <code>java.util.UUID</code> class instance as final field in this small class:</p> <pre><code>@Root public class Identity { @Attribute private final UUID id; public Identity(@Attribute UUID id) { this.id = id; } } </code></pre> <p><a href="http://simple.sourceforge.net/download/stream/doc/tutorial/tutorial.php#converters" rel="noreferrer">Tutorial</a> shows how to serialize third-party objects by registering converters like this:</p> <pre><code>Registry registry = new Registry(); registry.bind(UUID.class, UUIDConverter.class); Strategy strategy = new RegistryStrategy(registry); Serializer serializer = new Persister(strategy); serializer.write( object, stream ); </code></pre> <p>appropriate converter for UUID is pretty simple:</p> <pre><code>public class UUIDConverter implements Converter&lt;UUID&gt; { @Override public UUID read(InputNode node) throws Exception { return new UUID.fromString(node.getValue()); } @Override public void write(OutputNode node, UUID value) throws Exception { node.setValue(value.toString()); } } </code></pre> <p>But this simple code just didn't work for me, during serialization objects with UUID fields was thrown exception <strong>Transform of class java.util.UUID not supported</strong>.</p> <p>I have tried something something similar with custom <code>Matcher</code> (which was not in tutorial) that works for me:</p> <pre><code>Serializer serializer = new Persister(new MyMatcher()); serializer.write( object, stream ); </code></pre> <p>and <code>Matcher</code> class looks like this:</p> <pre><code>public static class MyMatcher implements Matcher { @Override @SuppressWarnings("unchecked") public Transform match(Class type) throws Exception { if (type.equals(UUID.class)) return new UUIDTransform(); return null; } } public class UUIDTransform implements Transform&lt;UUID&gt; { @Override public UUID read(String value) throws Exception { return UUID.fromString(value); } @Override public String write(UUID value) throws Exception { return value.toString(); } } </code></pre> <p>Questions:</p> <ul> <li>Is custom Matcher always recommended practice for streaming third-party classes? </li> <li>In which case I can use Converter?</li> <li>Are there any better tutorials/examples for Simple XML out there?</li> </ul> <p>Thank you.</p>
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    1. CODid you try using the Convert annotation and the AnnotationStrategy with your converter? Did that work?
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    2. COVery same exception with AnnotationStrategy. Similar class with `java.net.URL` field instead of UUID is serialized ok with custom converter. There is built-in support for serialization of URL class inside Simple XML by URLTransform class.
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    3. COIt looks like Convert<T> is only for customizing serialization of already supported classes, for unknown-for-Simple classes (for example `java.util.UUID`) is necessary create appropriate Transform<T> class and use it with custom Matcher.
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