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POJava - how to simplify my java
 

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    <p>I am writing some java code in the Spring Framework.</p> <p>I've got two beans, person and person1. They have a slightly different structure, that is to say the variable names for each differ slightly. </p> <p>I'm trying to copy the details from one bean to the other. I only want to copy the value if the value is not null. I've seen an API called BeanUtils, but this will copy it regardless if it is null or not. </p> <p>Here's my code:</p> <pre><code>if (person != null) { if (person.getAddressDetails() != null) { if (person.getAddressDetails().getStreetNumber() != null) { person1.getAddressDetails().setStreetNo(person.getAddressDetails().getStreetNumber()); } if (person.getAddressDetails().getStreetName() != null) { person1.getAddressDetails().setStreetName(person.getAddressDetails().getStreetName()); } } if (person.getHomeDetails() != null) { if (person.getHomeDetails().getPhoneNumber() != null) { person1.getHomeDetails().setSPhoneNo(person.getHomeDetails().getPhoneNumber()); } } } </code></pre> <p>I have about 40 nodes that need to be copied over and this would create so much ugly code. Does anyone have a better way to do this? maybe if i make a mapping or something and then loop through it? not sure.</p> <p>If not, does anyone know if i can make BeanUtils run a copy without copying the null values?</p> <p>Reason is that the second bean, person1, already has a bunch of values. I only want to overwrite that if there are new values to overwrite it with. </p> <p>As usual the variables are part of a much larger system and I can't standardise the names.</p> <p>Thanks</p>
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    1. COIf all the values are defined by standard getter/setter methods, you could use reflection to find the fields and only perform the copy if the field was not null. You'd be trading off if/else blocks for try/catch blocks and reflection code, however.
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    2. COI'm not familiar with reflection, can you explain?
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    3. COYou don't explicitly say it, but am I correct in assuming person and person1 are instances of the same class?
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