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2013-09-26T15:08:20.563
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2013-09-26T16:49:35.540
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You can embed objects both in node entities and in relationship entities, leveraging the Spring type conversion system <a href="http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/validation.html" rel="nofollow">Spring type conversion system</a>. Provide a pair of string-to-object and object-to-string converters and declare them in the Spring configuration file. The following is a simple scheme that I successfully used in an SDN based application. Objects extend the Embedded common interface to conveniently declare a single converter and are converted to/from JSON string format (this is only to get a better readability when exploring graph node properties, you can choose whatever string format you prefer). <ol> <li>String to object converter: <pre><code>final class StringToEmbeddedConverterFactory implements ConverterFactory<String, Embedded> { @Override public <T extends Embedded> Converter<String, T> getConverter(Class<T> type) { return new StringToEmbeddedConverter(type); } private final class StringToEmbeddedConverter<S extends String, E extends Embedded> implements Converter<S, E> { private Class<E> embeddedType; public StringToEmbeddedConverter(Class<E> embeddedType) { this.embeddedType = embeddedType; } @Override public E convert(S source) { if (source != null) { return (E) new Gson().fromJson(source, embeddedType); } else { return null; } } } } </code></pre></li> <li>Object to string converter: <pre><code> final class EmbeddedToStringConverterFactory implements ConverterFactory<Embedded, String> { @Override public <T extends String> Converter<Embedded, T> getConverter(Class<T> type) { return new EmbeddedToStringConverter(type); } private final class EmbeddedToStringConverter<E extends Embedded, S extends String> implements Converter<E, S> { private Class<S> stringType; public EmbeddedToStringConverter(Class<S> stringType) { this.stringType = stringType; } @Override public S convert(E source) { if (source != null) { return (S) new Gson().toJson(source); } else { return null; } } } } </code></pre></li> <li>Spring configuration.</li> </ol> Put the following lines in the Spring configurations file to declare the converter factories: <pre><code> <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"> <property name="converters"> <list> <bean class="com.example.EmbeddedToStringConverterFactory"/> <bean class="com.example.StringToEmbeddedConverterFactory"/> </list> </property> </bean> </code></pre>
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