Anyway to pass a constructor parameter to a JAXB Adapter?

Question

I\'m using Spring 3 IOC and JAXB/JAX-WS in a WebService that I wrote. I am having a slight issue right now with data that must be rounded prior to returning to the consumer as

Answer 1

I'm not sure how you hook this in with Spring, but below is a description of the JAXB mechanism that you can leverage.

If you have the following:

@javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter(value=RoundingAdapter.class,type=java.math.BigDecimal.class)

Then using the standalone JAXB APIs you could do the following. The code below means whenever the RoundingAdapter is encountered, the specified instance should be used.

marshaller.setAdapter(new RoundingAdapter(4));
unmarshaller.setAdapter(new RoundingAdapter(4));

For More Information

• http://blog.bdoughan.com/2011/09/mixing-nesting-and-references-with.html

Answer 2

Usage

import com.company.BigDecimalAdapter.X$XXXX;
...

@XmlElement(name = "QTY")
@XmlJavaTypeAdapter(X$XXXX.class)
private BigDecimal quantity;

BigDecimalAdapter

import static java.math.RoundingMode.HALF_UP;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class BigDecimalAdapter extends XmlAdapter<String, BigDecimal> {

    public static final class X$XX extends BigDecimalAdapter {
        public X$XX() {
            super("#.##");
        }
    }

    public static final class X$00 extends BigDecimalAdapter {
        public X$00() {
            super("#.00");
        }
    }

    public static final class X$XXXX extends BigDecimalAdapter {
        public X$XXXX() {
            super("#.####");
        }
    }

    private final ThreadLocal<DecimalFormat> format;

    public BigDecimalAdapter(String pattern) {
        format = ThreadLocal.withInitial(() -> {
            DecimalFormat df = new DecimalFormat(pattern);
            df.setRoundingMode(HALF_UP);
            return df;
        });
    }

    @Override
    public String marshal(BigDecimal v) throws Exception {
        return format.get().format(v);
    }

    @Override
    public BigDecimal unmarshal(String v) throws Exception {
        return new BigDecimal(v);
    }
}