<?xml version="1.0" encoding="UTF-8"?>
<todolist xmlns="http://xmlbeans.apache.org/samples/validation/todolist">
    <item id="001">
      <name>Buy a south Pacific island.</name>
      <description>Contingent on inheriting lots of money.</description>
      <due_by>2005-05-01T23:36:28</due_by>
      <action>someday_maybe_defer</action>
    </item>
    <item id="002">
      <name>Get that new PowerBook I've been eyeing.</name>
      <description>Resulting productivity increase will be exponential!</description>
      <due_by>2005-05-01T23:36:28</due_by>
      <action>do</action>
    </item>
    <item id="003">
      <name>Clean the garage.</name>
      <description>Remove at least enough junk so that my bicycle fits.</description>
      <due_by>2005-05-30T23:36:28</due_by>
      <action>delegate</action>
    </item>
</todolist>

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://xmlbeans.apache.org/samples/validation/todolist" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://xmlbeans.apache.org/samples/validation/todolist" elementFormDefault="qualified">
    <xs:element name="todolist">
        <xs:complexType>
            <xs:sequence>
                <xs:element name="item" type="itemType" maxOccurs="unbounded"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
    <xs:complexType name="itemType">
        <xs:sequence>
            <xs:element name="name" type="xs:string"/>
            <xs:element name="description" type="xs:string" minOccurs="0"/>
            <xs:element name="due_by" type="xs:dateTime" minOccurs="0"/>
            <xs:element name="action" type="actionType"/>
        </xs:sequence>
        <xs:attribute name="id" type="idType"/>
    </xs:complexType>
    <xs:simpleType name="nameType">
        <xs:restriction base="xs:string">
            <xs:maxLength value="50"/>
        </xs:restriction>
    </xs:simpleType>
    <xs:simpleType name="idType">
        <xs:restriction base="xs:int">
            <xs:maxExclusive value="100"/>
        </xs:restriction>
    </xs:simpleType>
    <xs:simpleType name="actionType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="do"/>
            <xs:enumeration value="delegate"/>
            <xs:enumeration value="someday_maybe_defer"/>
            <xs:enumeration value="toss"/>
            <xs:enumeration value="incubate"/>
            <xs:enumeration value="file"/>
        </xs:restriction>
    </xs:simpleType>
</xs:schema>

package net.zj.xmlbeans.validation;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlOptions;
import org.apache.xmlbeans.samples.validation.todolist.ItemType;
import org.apache.xmlbeans.samples.validation.todolist.TodolistDocument;
import org.apache.xmlbeans.samples.validation.todolist.TodolistDocument.Todolist;

public class Validation {
    private static XmlOptions m_validationOptions;

    public boolean isValidAfterChanges(String xmlPath) {
        System.out.println("Validating after changes:");
        // Set up the validation error listener.
        ArrayList<String> validationErrors = new ArrayList<String>();
        m_validationOptions = new XmlOptions();
        m_validationOptions.setErrorListener(validationErrors);

        TodolistDocument todoList = (TodolistDocument) parseXml(xmlPath, null);

        // Schema defines the <name> element as required (minOccurs = '1').
        // Add an error.
        todoList.getTodolist().getItemArray(0).setName(null);

        // During validation, errors are added to the ArrayList for
        // retrieval and printing by the printErrors method.
        boolean isValid = todoList.validate(m_validationOptions);

        if (!isValid) {
            printErrors(validationErrors);
        }
        return isValid;
    }

    public boolean isValidOnTheFly(String xmlPath) {
        System.out.println("Validating on-the-fly:");
        m_validationOptions = new XmlOptions();
        m_validationOptions.setValidateOnSet();

        TodolistDocument todoList = (TodolistDocument) parseXml(xmlPath,
                m_validationOptions);
        Todolist list = todoList.getTodolist();
        ItemType firstItem = list.getItemArray(0);

        // Schema defines the <id> element as allowing values up to 100.
        // Add an error.
        firstItem.setId(8587);

        // This line will not be reached.
        return todoList.validate();
    }

    public void printErrors(ArrayList<String> validationErrors) {
        System.out.println("Errors discovered during validation:");
        Iterator<String> iter = validationErrors.iterator();
        while (iter.hasNext()) {
            System.out.println(">> " + iter.next() + "\n");
        }
    }

    public XmlObject parseXml(String xmlFilePath, XmlOptions validationOptions) {
        File xmlFile = new File(xmlFilePath);
        XmlObject xml = null;
        try {
            xml = XmlObject.Factory.parse(xmlFile, validationOptions);
        } catch (XmlException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return xml;
    }
    
    public static void main(String[] args) {
        Validation thisSample = new Validation();
        String xmlPath = "docs/todolist.xml";

        // Use the validate method to validate an instance after
        // updates.
        thisSample.isValidAfterChanges(xmlPath);

        // Use the VALIDATE_ON_SET option to validate an instance
        // as updates are made.
        thisSample.isValidOnTheFly(xmlPath);
    }
}