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Newsgroups: comp.lang.java.programmer
Date: Mon, 19 Nov 2012 02:22:46 -0800 (PST)
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Subject: Re: How to convert Map to xml based on Schema.
From: Mausam <mausamhere@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:19809

Thanks a lot Arne for taking up the time to write code. However we do not w=
ant to generate java files everytime we get a different schema. Schema and =
values are not fixed to one or two datatypes.


On Monday, November 19, 2012 8:12:15 AM UTC+5:30, Arne Vajh=F8j wrote:
> On 11/18/2012 4:15 PM, Arne Vajh=EF=BF=BDj wrote:
>=20
> > On 11/17/2012 1:52 AM, Mausam wrote:
>=20
> >> I have a Map (it can be nested map, containing of maps) and a schema.
>=20
> >> Keys in Map represent element/attribute name of the schema and an
>=20
> >> entry in Map will be at same depth as an element defined in schema
>=20
> >>
>=20
> >> I need help in generating xml from the map as per the schema provided,
>=20
> >> without generating new files (as e.g Jaxb would require) Sample
>=20
> >> schema/map provided below
>=20
> >>
>=20
> >> e.g Map =3D
>=20
> >> [dept=3D[deptno=3D"10",dname=3D"ABC",loc=3D"XYZ",emps=3D[[empno=3D1000=
,ename=3D"Albert"],[empno=3D2000,ename=3D"John"]]]]
>=20
> >> and schema will be
>=20
> >>
>=20
> >> e.g Schema
>=20
> >> <?xml version=3D"1.0" encoding=3D"windows-1252" ?>
>=20
> >> <xsd:schema xmlns:xsd=3D"http://www.w3.org/2001/XMLSchema"
>=20
> >> elementFormDefault=3D"qualified">
>=20
> >>    <xsd:element name=3D"depts">
>=20
> >>      <xsd:complexType>
>=20
> >>        <xsd:sequence>
>=20
> >>          <xsd:element name=3D"dept" maxOccurs=3D"unbounded">
>=20
> >>            <xsd:complexType>
>=20
> >>              <xsd:sequence>
>=20
> >>                <xsd:element name=3D"deptno" type=3D"xsd:string"/><!-- =
This
>=20
> >> simple element e.g can be attribute in some schema-->
>=20
> >>                <xsd:element name=3D"dname" type=3D"xsd:string"/>
>=20
> >>                <xsd:element name=3D"emps" maxOccurs=3D"unbounded"
>=20
> >> minOccurs=3D"0">
>=20
> >>                  <xsd:complexType>
>=20
> >>                    <xsd:sequence>
>=20
> >>                      <xsd:element name=3D"empno" type=3D"xsd:string"/>
>=20
> >>                      <xsd:element name=3D"ename" type=3D"xsd:string"/>
>=20
> >>                    </xsd:sequence>
>=20
> >>                  </xsd:complexType>
>=20
> >>                </xsd:element>
>=20
> >>              </xsd:sequence>
>=20
> >>            </xsd:complexType>
>=20
> >>          </xsd:element>
>=20
> >>        </xsd:sequence>
>=20
> >>      </xsd:complexType>
>=20
> >>    </xsd:element>
>=20
> >> </xsd:schema>
>=20
> >
>=20
> > I would probably:
>=20
> > - generate a Java class from the schema (xjc)
>=20
> > - populate from Map to an instance of that class via recursion
>=20
> >    and reflection
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> > - serialize instance to XML via JAXB
>=20
> >
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> > If you have high performance requirements, then you may need
>=20
> > to do some custom coding.
>=20
>=20
>=20
> Demo with Map:
>=20
>=20
>=20
> import java.beans.IntrospectionException;
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> import java.beans.PropertyDescriptor;
>=20
> import java.lang.reflect.InvocationTargetException;
>=20
> import java.util.HashMap;
>=20
> import java.util.Map;
>=20
>=20
>=20
> public class AutoMapper {
>=20
> 	private static Object xctor(Object o, String propnam) throws=20
>=20
> IntrospectionException, InstantiationException, IllegalAccessException {
>=20
> 		PropertyDescriptor pd =3D new PropertyDescriptor(propnam, o.getClass())=
;
>=20
> 		return pd.getPropertyType().newInstance();
>=20
> 	}
>=20
> 	private static void xset(Object o, String propnam, Object val) throws=20
>=20
> IntrospectionException, IllegalArgumentException,=20
>=20
> IllegalAccessException, InvocationTargetException {
>=20
> 		PropertyDescriptor pd =3D new PropertyDescriptor(propnam, o.getClass())=
;
>=20
> 		pd.getWriteMethod().invoke(o, val);
>=20
> 	}
>=20
> 	@SuppressWarnings("unchecked")
>=20
> 	private static void map(Map<String,Object> m, Object o) throws=20
>=20
> IllegalArgumentException, IntrospectionException,=20
>=20
> IllegalAccessException, InvocationTargetException, InstantiationException=
 {
>=20
> 		for(String key : m.keySet()) {
>=20
> 			Object val =3D m.get(key);
>=20
> 			if(val instanceof Map) {
>=20
> 				Object o2 =3D xctor(o, key);
>=20
> 				map((Map<String, Object>) val, o2);
>=20
> 				xset(o, key, o2);
>=20
> 			} else {
>=20
> 				xset(o, key, val);
>=20
> 			}
>=20
> 		}
>=20
> 	}
>=20
> 	public static void main(String[] args) throws Exception {
>=20
> 		Map<String,Object> m2 =3D new HashMap<String,Object>();
>=20
> 		m2.put("iv", 456);
>=20
> 		m2.put("xv", 123.456);
>=20
> 		Map<String,Object> m =3D new HashMap<String,Object>();
>=20
> 		m.put("iv", 123);
>=20
> 		m.put("sv", "ABC");
>=20
> 		m.put("cv", m2);
>=20
> 		Data o =3D new Data();
>=20
> 		System.out.println(m);
>=20
> 		map(m, o);
>=20
> 		System.out.println(o);
>=20
> 	}
>=20
> }
>=20
>=20
>=20
> class Data {
>=20
> 	private int iv;
>=20
> 	private String sv;
>=20
> 	private SubData cv;
>=20
> 	public int getIv() {
>=20
> 		return iv;
>=20
> 	}
>=20
> 	public void setIv(int iv) {
>=20
> 		this.iv =3D iv;
>=20
> 	}
>=20
> 	public String getSv() {
>=20
> 		return sv;
>=20
> 	}
>=20
> 	public void setSv(String sv) {
>=20
> 		this.sv =3D sv;
>=20
> 	}
>=20
> 	public SubData getCv() {
>=20
> 		return cv;
>=20
> 	}
>=20
> 	public void setCv(SubData cv) {
>=20
> 		this.cv =3D cv;
>=20
> 	}
>=20
> 	@Override
>=20
> 	public String toString() {
>=20
> 		return "(iv=3D" + iv + ",sv=3D" + sv + ",cv=3D" + cv + ")";
>=20
> 	}
>=20
> }
>=20
>=20
>=20
> class SubData {
>=20
> 	private int iv;
>=20
> 	private double xv;
>=20
> 	public int getIv() {
>=20
> 		return iv;
>=20
> 	}
>=20
> 	public void setIv(int iv) {
>=20
> 		this.iv =3D iv;
>=20
> 	}
>=20
> 	public double getXv() {
>=20
> 		return xv;
>=20
> 	}
>=20
> 	public void setXv(double xv) {
>=20
> 		this.xv =3D xv;
>=20
> 	}
>=20
> 	@Override
>=20
> 	public String toString() {
>=20
> 		return "(iv=3D" + iv + ",xv=3D" + xv + ")";
>=20
> 	}
>=20
> }
>=20
>=20
>=20
> Arne
>=20
>=20
>=20
> PS: It looks like you may really need to convert List not Map.