Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #19809

Re: How to convert Map to xml based on Schema.

Show all headers | View raw

Thanks a lot Arne for taking up the time to write code. However we do not want 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 Vajhøj wrote:
> On 11/18/2012 4:15 PM, Arne Vajh�j wrote:
> 
> > On 11/17/2012 1:52 AM, Mausam wrote:
> 
> >> I have a Map (it can be nested map, containing of maps) and a schema.
> 
> >> Keys in Map represent element/attribute name of the schema and an
> 
> >> entry in Map will be at same depth as an element defined in schema
> 
> >>
> 
> >> I need help in generating xml from the map as per the schema provided,
> 
> >> without generating new files (as e.g Jaxb would require) Sample
> 
> >> schema/map provided below
> 
> >>
> 
> >> e.g Map =
> 
> >> [dept=[deptno="10",dname="ABC",loc="XYZ",emps=[[empno=1000,ename="Albert"],[empno=2000,ename="John"]]]]
> 
> >> and schema will be
> 
> >>
> 
> >> e.g Schema
> 
> >> <?xml version="1.0" encoding="windows-1252" ?>
> 
> >> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
> 
> >> elementFormDefault="qualified">
> 
> >>    <xsd:element name="depts">
> 
> >>      <xsd:complexType>
> 
> >>        <xsd:sequence>
> 
> >>          <xsd:element name="dept" maxOccurs="unbounded">
> 
> >>            <xsd:complexType>
> 
> >>              <xsd:sequence>
> 
> >>                <xsd:element name="deptno" type="xsd:string"/><!-- This
> 
> >> simple element e.g can be attribute in some schema-->
> 
> >>                <xsd:element name="dname" type="xsd:string"/>
> 
> >>                <xsd:element name="emps" maxOccurs="unbounded"
> 
> >> minOccurs="0">
> 
> >>                  <xsd:complexType>
> 
> >>                    <xsd:sequence>
> 
> >>                      <xsd:element name="empno" type="xsd:string"/>
> 
> >>                      <xsd:element name="ename" type="xsd:string"/>
> 
> >>                    </xsd:sequence>
> 
> >>                  </xsd:complexType>
> 
> >>                </xsd:element>
> 
> >>              </xsd:sequence>
> 
> >>            </xsd:complexType>
> 
> >>          </xsd:element>
> 
> >>        </xsd:sequence>
> 
> >>      </xsd:complexType>
> 
> >>    </xsd:element>
> 
> >> </xsd:schema>
> 
> >
> 
> > I would probably:
> 
> > - generate a Java class from the schema (xjc)
> 
> > - populate from Map to an instance of that class via recursion
> 
> >    and reflection
> 
> > - serialize instance to XML via JAXB
> 
> >
> 
> > If you have high performance requirements, then you may need
> 
> > to do some custom coding.
> 
> 
> 
> Demo with Map:
> 
> 
> 
> import java.beans.IntrospectionException;
> 
> import java.beans.PropertyDescriptor;
> 
> import java.lang.reflect.InvocationTargetException;
> 
> import java.util.HashMap;
> 
> import java.util.Map;
> 
> 
> 
> public class AutoMapper {
> 
> 	private static Object xctor(Object o, String propnam) throws 
> 
> IntrospectionException, InstantiationException, IllegalAccessException {
> 
> 		PropertyDescriptor pd = new PropertyDescriptor(propnam, o.getClass());
> 
> 		return pd.getPropertyType().newInstance();
> 
> 	}
> 
> 	private static void xset(Object o, String propnam, Object val) throws 
> 
> IntrospectionException, IllegalArgumentException, 
> 
> IllegalAccessException, InvocationTargetException {
> 
> 		PropertyDescriptor pd = new PropertyDescriptor(propnam, o.getClass());
> 
> 		pd.getWriteMethod().invoke(o, val);
> 
> 	}
> 
> 	@SuppressWarnings("unchecked")
> 
> 	private static void map(Map<String,Object> m, Object o) throws 
> 
> IllegalArgumentException, IntrospectionException, 
> 
> IllegalAccessException, InvocationTargetException, InstantiationException {
> 
> 		for(String key : m.keySet()) {
> 
> 			Object val = m.get(key);
> 
> 			if(val instanceof Map) {
> 
> 				Object o2 = xctor(o, key);
> 
> 				map((Map<String, Object>) val, o2);
> 
> 				xset(o, key, o2);
> 
> 			} else {
> 
> 				xset(o, key, val);
> 
> 			}
> 
> 		}
> 
> 	}
> 
> 	public static void main(String[] args) throws Exception {
> 
> 		Map<String,Object> m2 = new HashMap<String,Object>();
> 
> 		m2.put("iv", 456);
> 
> 		m2.put("xv", 123.456);
> 
> 		Map<String,Object> m = new HashMap<String,Object>();
> 
> 		m.put("iv", 123);
> 
> 		m.put("sv", "ABC");
> 
> 		m.put("cv", m2);
> 
> 		Data o = new Data();
> 
> 		System.out.println(m);
> 
> 		map(m, o);
> 
> 		System.out.println(o);
> 
> 	}
> 
> }
> 
> 
> 
> class Data {
> 
> 	private int iv;
> 
> 	private String sv;
> 
> 	private SubData cv;
> 
> 	public int getIv() {
> 
> 		return iv;
> 
> 	}
> 
> 	public void setIv(int iv) {
> 
> 		this.iv = iv;
> 
> 	}
> 
> 	public String getSv() {
> 
> 		return sv;
> 
> 	}
> 
> 	public void setSv(String sv) {
> 
> 		this.sv = sv;
> 
> 	}
> 
> 	public SubData getCv() {
> 
> 		return cv;
> 
> 	}
> 
> 	public void setCv(SubData cv) {
> 
> 		this.cv = cv;
> 
> 	}
> 
> 	@Override
> 
> 	public String toString() {
> 
> 		return "(iv=" + iv + ",sv=" + sv + ",cv=" + cv + ")";
> 
> 	}
> 
> }
> 
> 
> 
> class SubData {
> 
> 	private int iv;
> 
> 	private double xv;
> 
> 	public int getIv() {
> 
> 		return iv;
> 
> 	}
> 
> 	public void setIv(int iv) {
> 
> 		this.iv = iv;
> 
> 	}
> 
> 	public double getXv() {
> 
> 		return xv;
> 
> 	}
> 
> 	public void setXv(double xv) {
> 
> 		this.xv = xv;
> 
> 	}
> 
> 	@Override
> 
> 	public String toString() {
> 
> 		return "(iv=" + iv + ",xv=" + xv + ")";
> 
> 	}
> 
> }
> 
> 
> 
> Arne
> 
> 
> 
> PS: It looks like you may really need to convert List not Map.

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

How to convert Map to xml based on Schema. Mausam <mausamhere@gmail.com> - 2012-11-16 22:52 -0800
  Re: How to convert Map to xml based on Schema. Roedy Green <see_website@mindprod.com.invalid> - 2012-11-17 00:48 -0800
    Re: How to convert Map to xml based on Schema. Mausam <mausamhere@gmail.com> - 2012-11-17 20:14 -0800
      Re: How to convert Map to xml based on Schema. Roedy Green <see_website@mindprod.com.invalid> - 2012-11-18 07:02 -0800
  Re: How to convert Map to xml based on Schema. Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:15 -0500
    Re: How to convert Map to xml based on Schema. Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 21:42 -0500
      Re: How to convert Map to xml based on Schema. Mausam <mausamhere@gmail.com> - 2012-11-19 02:22 -0800
        Re: How to convert Map to xml based on Schema. Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 09:37 -0500
  Re: How to convert Map to xml based on Schema. Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-19 06:59 -0400
    Re: How to convert Map to xml based on Schema. Mausam <mausamhere@gmail.com> - 2012-11-19 22:26 -0800
  Re: How to convert Map to xml based on Schema. Stuart <DerTopper@web.de> - 2012-11-20 20:52 +0100

csiph-web