XJC restriction convert Double to String

Question

i read XML by generated javax.xml.bind-Annotated classes from XSD.

<xsd:complexType name="foo">
  <xsd:attribute name="bar" type="xsd:double" />
</xsd:complexType>

So my class is generated to:

public Double getBar(){....}

Ok, to ensure a double-Attribute is positive, i use xsd:restriction.

<xsd:simpleType name="DoublePositive">
  <xsd:restriction base="xsd:double">
    <xsd:minExclusive value="0" />
  </xsd:restriction>
</xsd:simpleType>

<xsd:complexType name="foo">
  <xsd:attribute name="bar" type="DoublePositive" />
</xsd:complexType>

Too bad, xjc generate a String instead of a Double.

public String getBar(){....}

Can i Force to use Double instead of String?

Solution:

My Question was wrong. I had xsi:type="DoublePositive" instead of type="DoublePositive"

maybe you can add custom binding, for example http://stackoverflow.com/questions/13568543/how-do-you-specify-the-date-format-used-when-jaxb-marshals-xsddatetime — user1516873, Jan 22 '14 at 14:27
principle is the same. You can create binding file and pass to xjc with -b option — user1516873, Jan 22 '14 at 14:46
Possible duplicate of http://stackoverflow.com/questions/7182533/using-jaxb-generated-class-for-an-element-that-requires-an-integer-with-a-patter — flup, Jan 27 '14 at 21:00
I tried it out and xjc (version `JAXB 2.1.10 in JDK 6`) actually generates an unrestricted Double. No binding file, no adapter, no nothing. Same for version `v2.2.4-2`. What version are you using? — flup, Jan 27 '14 at 22:34

score 4 · Accepted Answer · edited Apr 22 '16 at 09:33

Here is my configuration, which i use to generate classes.

test.xsd - your xsd file

 <?xml version="1.0" encoding="utf-8"?>
 <xsd:schema elementFormDefault="qualified" targetNamespace=""
             xmlns:xsd="http://www.w3.org/2001/XMLSchema">

   <xsd:simpleType name="DoublePositive">
     <xsd:restriction base="xsd:double">
       <xsd:minExclusive value="0"/>
     </xsd:restriction>
   </xsd:simpleType>

   <xsd:complexType name="foo">
     <xsd:attribute name="bar" type="DoublePositive"/>
   </xsd:complexType>
 </xsd:schema>

text.xml - file with global bindings.

<jaxb:bindings version="2.1"
                xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
                xmlns:xs="http://www.w3.org/2001/XMLSchema">

   <jaxb:globalBindings generateElementProperty="false">
     <jaxb:javaType name="java.util.Double" xmlType="DoublePositive"
                    parseMethod="Converter.fromString"
                    printMethod="Converter.toString"/>
   </jaxb:globalBindings> 
 </jaxb:bindings>

Converter.java - class with conversion functions.

public class Converter {
  public static Double fromString(String str){
    return Double.parseDouble(str);
  }

  public static String toString(Double value){
    return String.valueOf(value);
  }
}

That's all. Call xjc with command

xjc -b test.xml -classpath . test.xsd.

$ xjc -version
xjc version "JAXB 2.1.10" 
JavaTM Architecture for XML Binding(JAXB) Reference Implementation, (build JAXB 2.1.10)
$ xjc -b test.xml -classpath . test.xsd 
parsing a schema... 
[WARNING] EmptyTargetNamespace: In schema document 'file:/pwd/test.xsd', the
value of the 'targetNamespace' attribute cannot be an empty string.  
line 3 of file:/pwd/test.xsd

compiling a schema... 
generated/Adapter1.java
generated/Foo.java
generated/ObjectFactory.java

and generated file content:

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "foo")
public class Foo {

    @XmlAttribute
    @XmlJavaTypeAdapter(Adapter1 .class)
    protected Double bar;

    /**
     * Gets the value of the bar property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public Double getBar() {
        return bar;
    }

    /**
     * Sets the value of the bar property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setBar(Double value) {
        this.bar = value;
    }

}

and Adapter class

package generated;

import java.util.Double;
import javax.xml.bind.annotation.adapters.XmlAdapter;

public class Adapter1
    extends XmlAdapter<String, Double>
{


    public Double unmarshal(String value) {
        return (Converter.fromString(value));
    }

    public String marshal(Double value) {
        return (Converter.toString(value));
    }

}

So, as you can see, xjc generates the classes correctly. If you still get a String, then maybe you forgot to add something in your configuration. But without the details about your configuration, it is impossible to say what is wrong with your code.

Still String after `maven clean install`. Should the `text.xml` not be named `bindings.xjb`? — Grim, Jan 27 '14 at 14:09
it can be named as you like. I used file names from my old test project. — user1516873, Jan 27 '14 at 14:29

XJC restriction convert Double to String

Solution:

1 Answers1