RE: implementing a custom interface

My colleagues say this wasn't clear.



The base type defined in the XSD in effect becomes the interface to the implementing types.  This approach keeps you painting between the lines in the XSD world rather than drifting off the beam customizing XMLBeans.



The example below implements a complexType ProductType that has the two attributes you want in your interface, beginning and ending balance.  The 3 complexTypes SavingsType, CheckingType, and CertificateType extend ProductType in the XSD and therefore implement the interface in the code.  Note in the code example that the common information is available either from the base type (ProductType) or the implementing type.



Paul Gillen


----------

XSD
----------

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns="xsd.account.bank.com" xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="xsd.account.bank.com" elementFormDefault="qualified" attributeFormDefault="unqualified">

      <xs:element name="BankExample">

            <xs:complexType>

                  <xs:sequence>

                        <xs:element name="Accounts">

                              <xs:complexType>

                                    <xs:choice maxOccurs="unbounded">

                                          <xs:element name="Savings" type="SavingsType"/>

                                          <xs:element name="Checking" type="CheckingType"/>

                                          <xs:element name="Certificate" type="CertificateType"/>

                                    </xs:choice>

                              </xs:complexType>

                        </xs:element>

                  </xs:sequence>

            </xs:complexType>

      </xs:element>

      <xs:complexType name="ProductType">

            <xs:attribute name="startingBal" type="xs:float" use="required"/>

            <xs:attribute name="endingBal" type="xs:float" use="required"/>

      </xs:complexType>

      <xs:complexType name="SavingsType">

            <xs:complexContent>

                  <xs:extension base="ProductType">

                        <xs:attribute name="savingsStuff" type="xs:string" use="required"/>

                  </xs:extension>

            </xs:complexContent>

      </xs:complexType>

      <xs:complexType name="CheckingType">

            <xs:complexContent>

                  <xs:extension base="ProductType">

                        <xs:attribute name="checkingStuff" type="xs:string" use="required"/>

                  </xs:extension>

            </xs:complexContent>

      </xs:complexType>

      <xs:complexType name="CertificateType">

            <xs:complexContent>

                  <xs:extension base="ProductType">

                        <xs:attribute name="certificateStuff" type="xs:string" use="required"/>

                  </xs:extension>

            </xs:complexContent>

      </xs:complexType>

</xs:schema>
----------

CODE
----------

package com.bank.account;



import java.io.File;



import org.apache.xmlbeans.QNameSet;

import org.apache.xmlbeans.XmlObject;



import com.bank.account.xsd.BankExampleDocument;

import com.bank.account.xsd.CertificateType;

import com.bank.account.xsd.CheckingType;

import com.bank.account.xsd.ProductType;

import com.bank.account.xsd.SavingsType;

import com.bank.account.xsd.BankExampleDocument.BankExample.Accounts;

import com.bank.account.xsd.BankExampleDocument.BankExample;





public class AccountProcessor

{

    private final static    String      xmlFileName     = "Account.xml";



    public static void main(String[] args)

    throws Exception

    {

        AccountProcessor module = new AccountProcessor();

        module.go(args);

    }



    private void go(String[] args)

    throws Exception

    {

        BankExampleDocument doc                 = BankExampleDocument.Factory.parse(new File(xmlFileName));

        String              rootURI             = doc.schemaType().getDocumentElementName().getNamespaceURI();

        BankExample         bankExample         = doc.getBankExample();

        Accounts            accounts            = bankExample.getAccounts();

        XmlObject[]         accountsChildren    = accounts.selectChildren(QNameSet.forWildcardNamespaceString("##any", rootURI));



        if (accountsChildren != null)

        {

            for (XmlObject accountChild:accountsChildren)

            {

                ProductType product     = (ProductType) accountChild;

                System.out.println("Info from ProductType: "+product.getStartingBal() +" "+product.getEndingBal());



                if (accountChild instanceof SavingsType)

                {

                    SavingsType     account     = (SavingsType) accountChild;

                    System.out.println("Savings Type:\t\t"+account.getSavingsStuff());

                    System.out.println("Starting Balance:\t"+account.getStartingBal());

                    System.out.println("Ending Balance:\t\t"+account.getEndingBal());

                }

                else if (accountChild instanceof CheckingType)

                {

                    CheckingType    account     = (CheckingType) accountChild;

                    System.out.println("Checking Type:\t\t"+account.getCheckingStuff());

                    System.out.println("Starting Balance:\t"+account.getStartingBal());

                    System.out.println("Ending Balance:\t\t"+account.getEndingBal());

                }

                else if (accountChild instanceof CertificateType)

                {

                    CertificateType account     = (CertificateType) accountChild;

                    System.out.println("Certificate Type:\t"+account.getCertificateStuff());

                    System.out.println("Starting Balance:\t"+account.getStartingBal());

                    System.out.println("Ending Balance:\t\t"+account.getEndingBal());

                }

            }

        }

    }

}
----------

SAMPLE XML
----------

<?xml version="1.0" encoding="UTF-8"?>

<BankExample xmlns="xsd.account.bank.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="xsd.account.bank.com xsd\BankExample.xsd">

      <Accounts>

            <Savings savingsStuff="Savings Info" endingBal="3.14" startingBal="13.14"/>

            <Checking checkingStuff="Checking Info" endingBal="23.14" startingBal="33.14"/>

            <Certificate certificateStuff="Certificate Info" endingBal="43.14" startingBal="53.14"/>

      </Accounts>

</BankExample>


----------

OUTPUT
----------
Info from ProductType: 13.14 3.14
Savings Type:           Savings Info
Starting Balance: 13.14
Ending Balance:         3.14
Info from ProductType: 33.14 23.14
Checking Type:          Checking Info
Starting Balance: 33.14
Ending Balance:         23.14
Info from ProductType: 53.14 43.14
Certificate Type: Certificate Info
Starting Balance: 53.14

Ending Balance:         43.14





-----Original Message-----
From: Gillen, Paul [mailto:[email protected]]
Sent: Friday, September 18, 2009 11:36 AM
To: '[email protected]'
Subject: RE: implementing a custom interface



If I understand you correctly, in your XSD create a base type with the common attributes.  Create types for each of your 3 derived from the base type.  In your code you can refer to each as basetype and for specifics test with instanceof.



Paul Gillen



-----Original Message-----

From: Jason Berk [mailto:[email protected]]

Sent: Friday, September 18, 2009 11:19 AM

To: [email protected]

Subject: implementing a custom interface



I have three types in my XSD: Savings, Checking, Certificate.



Is it possible to add something (to the .xsdconfig?) that makes all

three types implement an interface I created?



I want my beans to be like this:



Product

      getStaringBal()

      getEndingBal()



Savings implements Product

      getSavingsSpecificStuff()



Checking implements Product

      getCheckingSpecificStuff()



make sense?



Jason

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