dozer Boolean property mapping

问题

It appears that Dozer will not map a Boolean property if the accessor of that property is defined as isProperty() rather than getProperty().

The following groovy script illustrates the problem:

import org.dozer.*

class ProductCommand {
    Boolean foo 
}

public class ProductDto  {

    private Boolean foo;        

    public Boolean isFoo() { this.foo }    
    public void setFoo(Boolean p0) { this.foo = p0 }           
}

def mapper =  new DozerBeanMapper()

dto = new ProductDto(foo: true)
assert dto.isFoo()

ProductCommand mappedCmd = mapper.map(dto, ProductCommand)
assert mappedCmd.foo

The assertion on the final line fails. However, if I rename ProductDto.isFoo() to ProductDto.getFoo() it passes.

Is there a flag/option I can set in the Dozer mapping file that will instruct it to use either an is or get accessor for boolean properties? Alternatively, I could add a custom rule for every boolean property, but this is not very appealing.

Although the example above is written in Groovy, I've no reason to believe the same behaviour wouldn't be exhibited by the equivalent Java code.

These DTOs are generated by JAXB (which generates an "is" accessor, rather than a "get" accessor for booleans), so I can't rename the accessors. I'm using Dozer 5.3.2.

回答1:

May be you can use custom getter method to use it.

here s the example mapping (Write it in dozer-mapping file)

<mapping>
  <class-a>ProductDto</class-a>
  <class-b>ProductCommand</class-b>
<field>
  <a get-method="isFoo">foo</a>
  <b>foo</b>
</field>
</mapping>

So now dozer will use isFoo instead of predefined getFoo. Hope this works for you. :)

回答2:

Generating "is" methods for the Boolean wrapper class is a bug in JAXB, see Java Beans, BeanUtils, and the Boolean wrapper class and http://java.net/jira/browse/JAXB-131 for details. Seems to be fixed in jaxb 2.1.13

回答3:

This is a bug in JAXB, the small-b boolean should have isFoo(). You can either use the -enableIntrospection option with later versions of JAXB, or use the oldish boolean getter xjc plugin http://fisheye5.cenqua.com/browse/~raw,r=MAIN/jaxb2-commons/www/boolean-getter/index.html

回答4:

There also is another way of achieving the correct dozer mapping (the cleanest in my opinion):

<mapping>
    <class-a>ProductDto</class-a>
    <class-b>ProductCommand</class-b>
    <field>
       <a is-accessible=”true”>foo</a>
       <b is-accessible=”true”>foo</b>
    </field>
</mapping>

OR the way already mentioned earlier:

<mapping>
    <class-a>ProductDto</class-a>
    <class-b>ProductCommand</class-b>
    <field>
       <a get-method=”isFoo”>foo</a>
       <b>foo</b>
    </field>
</mapping>

来源：https://stackoverflow.com/questions/5802797/dozer-boolean-property-mapping

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