使用 Java 中的 XSOM 解析 XSD 架构。如何访问元素和复杂类型

Parsing XSD Schema with XSOM in Java. How to access element and complex types

提问by DUFF

I'm having a lot of difficuly parsing an .XSD file with a XSOM in Java. I have two .XSD files one defines a calendar and the second the global types. I'd like to be able to read the calendar file and determine that:

我在 Java 中使用 XSOM 解析 .XSD 文件时遇到了很多困难。我有两个 .XSD 文件，一个定义日历，第二个定义全局类型。我希望能够读取日历文件并确定：

calendar has 3 properties

日历有 3 个属性

• Valid is an ENUM called eYN
• Cal is a String
• Status is a ENUM called eSTATUS

• 有效的是一个名为 eYN 的 ENUM
• Cal 是一个字符串
• 状态是一个名为 eSTATUS 的 ENUM

Calendar.xsd

日历.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
 xmlns:gtypes="http://www.btec.com/gtypes"
 elementFormDefault="qualified">
<xs:import namespace="http://www.btec.com/gtypes"
 schemaLocation="gtypes.xsd"/>
<xs:element name="CALENDAR">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="Valid" type="eYN" minOccurs="0"/>
      <xs:element name="Cal" minOccurs="0">
        <xs:complexType>
          <xs:simpleContent>
            <xs:extension base="gtypes:STRING">
              <xs:attribute name="IsKey" type="xs:string" fixed="Y"/>
            </xs:extension>
          </xs:simpleContent>
        </xs:complexType>
      </xs:element>
      <xs:element name="Status" type="eSTATUS" minOccurs="0"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
<xs:complexType name="eSTATUS">
  <xs:simpleContent>
    <xs:extension base="gtypes:ENUM"/>
  </xs:simpleContent>
</xs:complexType>
<xs:complexType name="eYN">
  <xs:simpleContent>
    <xs:extension base="gtypes:ENUM"/>
  </xs:simpleContent>
</xs:complexType>

gtypes.xsd

gtypes.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
 targetNamespace="http://www.btec.com/gtypes"
 elementFormDefault="qualified">
<xs:complexType name="ENUM">
  <xs:simpleContent>
    <xs:extension base="xs:string">
      <xs:attribute name="TYPE" fixed="ENUM"/>
      <xs:attribute name="derived" use="optional"/>
      <xs:attribute name="readonly" use="optional"/>
      <xs:attribute name="required" use="optional"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>
<xs:complexType name="STRING">
  <xs:simpleContent>
    <xs:extension base="xs:string">
      <xs:attribute name="TYPE" use="optional"/>
      <xs:attribute name="derived" use="optional"/>
      <xs:attribute name="readonly" use="optional"/>
      <xs:attribute name="required" use="optional"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>
</xs:schema>

The code from my attempt to access this information is below. I'm pretty new to Java so any style criticism welcome.

我尝试访问此信息的代码如下。我对 Java 很陌生，所以欢迎任何风格批评。

I really need to know

我真的需要知道

1. How to I access the complex type cal and see that it's a string?
2. How do I access the definition of Status to see it's a enumeration of type eSTATUS emphasized text

1. 如何访问复杂类型 cal 并查看它是一个字符串？
2. 如何访问 Status 的定义以查看它是 eSTATUS强调文本类型的枚举

I've has several attempts to access the right information via ComplexType and Elements and Content. However I'm just don't get it and I cannot find any examples that help. I expect (hope) the best method is (relatively) simple when you know how. So, once again, if anyone could point me in the right direction that would be a great help.

我曾多次尝试通过 ComplexType 和 Elements and Content 访问正确的信息。但是我只是不明白，我找不到任何有帮助的例子。我期望（希望）最好的方法是（相对）简单的，当你知道怎么做的时候。所以，再一次，如果有人能指出我正确的方向，那将是一个很大的帮助。

xmlfile = "Calendar.xsd"
XSOMParser parser = new XSOMParser();

parser.parse(new File(xmlfile));
XSSchemaSet sset = parser.getResult();
XSSchema s = sset.getSchema(1);
if (s.getTargetNamespace().equals("")) // this is the ns with all the stuff
       // in
{
  // try ElementDecls
  Iterator jtr = s.iterateElementDecls();
  while (jtr.hasNext())
  {
    XSElementDecl e = (XSElementDecl) jtr.next();
    System.out.print("got ElementDecls " + e.getName());
    // ok we've got a CALENDAR.. what next?
    // not this anyway
    /*  
     *
     * XSParticle[] particles = e.asElementDecl() for (final XSParticle p :
     * particles) { final XSTerm pterm = p.getTerm(); if
     * (pterm.isElementDecl()) { final XSElementDecl ed =
     * pterm.asElementDecl(); System.out.println(ed.getName()); }
     */
  }

  // try all Complex Types in schema
  Iterator<XSComplexType> ctiter = s.iterateComplexTypes();
  while (ctiter.hasNext())
  {
    // this will be a eSTATUS. Lets type and get the extension to 
    // see its a ENUM
    XSComplexType ct = (XSComplexType) ctiter.next();
    String typeName = ct.getName();
    System.out.println(typeName + newline);

    // as Content
    XSContentType content = ct.getContentType();
    // now what?
    // as Partacle?
    XSParticle p2 = content.asParticle();
    if (null != p2)
    {
      System.out.print("We got partical thing !" + newline);
      // might would be good if we got here but we never do :-(
    }

    // try complex type Element Decs
    List<XSElementDecl> el = ct.getElementDecls();
    for (XSElementDecl ed : el)
    {
      System.out.print("We got ElementDecl !" + ed.getName() + newline);
      // would be good if we got here but we never do :-(
    }

    Collection<? extends XSAttributeUse> c = ct.getAttributeUses();
    Iterator<? extends XSAttributeUse> i = c.iterator();
    while (i.hasNext())
    {
      XSAttributeDecl attributeDecl = i.next().getDecl();
      System.out.println("type: " + attributeDecl.getType());
      System.out.println("name:" + attributeDecl.getName());
    }
  }
}

回答by DUFF

Well after a lot googling I think I've answered my own question. My proposed solution was hopelessly wide of the mark. The main problem was that the XSD has three namespaces and I was looking in the wrong one for the wrong thing.

好吧，经过大量的谷歌搜索，我想我已经回答了我自己的问题。我提出的解决方案是无可救药的。主要问题是 XSD 有三个命名空间，而我在错误的一个中寻找错误的东西。

If you're looking to parse an XSD in XSOM be sure you understand the structure of the XSD and what the tags mean before you start- it will save you a lot of time.

如果您想在 XSOM 中解析 XSD，请确保在开始之前了解 XSD 的结构和标签的含义- 这将为您节省大量时间。

I'll post my version below as I'm sure it can be improved!

我会在下面发布我的版本，因为我相信它可以改进！

Some links that were helpful:

一些有用的链接：

http://msdn.microsoft.com/en-us/library/ms187822.aspx

http://msdn.microsoft.com/en-us/library/ms187822.aspx

http://it.toolbox.com/blogs/enterprise-web-solutions/parsing-an-xsd-schema-in-java-32565

http://it.toolbox.com/blogs/enterprise-web-solutions/parsing-an-xsd-schema-in-java-32565

http://www.w3schools.com/schema/el_simpleContent.asp

http://www.w3schools.com/schema/el_simpleContent.asp

package xsom.test

import com.sun.xml.xsom.parser.XSOMParser;
import com.sun.xml.xsom.XSComplexType;
import com.sun.xml.xsom.XSContentType;
import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSModelGroup;
import com.sun.xml.xsom.XSParticle;
import com.sun.xml.xsom.XSSchema;
import com.sun.xml.xsom.XSSchemaSet;
import com.sun.xml.xsom.XSTerm;

import java.util.Iterator;
import java.io.File;
import java.util.HashMap;

public class mappingGenerator
{
  private HashMap mappings;

  public mappingGenerator()
  {
    mappings = new HashMap();
  }

  public void generate(String xmlfile) throws Exception
  {

    // with help from
    // http://msdn.microsoft.com/en-us/library/ms187822.aspx
    // http://it.toolbox.com/blogs/enterprise-web-solutions/parsing-an-xsd-schema-in-java-32565
    // http://www.w3schools.com/schema/el_simpleContent.asp
    XSOMParser parser = new XSOMParser();

    parser.parse(new File(xmlfile));
    XSSchemaSet sset = parser.getResult();

    // =========================================================
    // types namepace
    XSSchema gtypesSchema = sset.getSchema("http://www.btec.com/gtypes");
    Iterator<XSComplexType> ctiter = gtypesSchema.iterateComplexTypes();
    while (ctiter.hasNext())
    {
      XSComplexType ct = (XSComplexType) ctiter.next();
      String typeName = ct.getName();
      // these are extensions so look at the base type to see what it is
      String baseTypeName = ct.getBaseType().getName();
      System.out.println(typeName + " is a " + baseTypeName);
    }

    // =========================================================
    // global namespace
    XSSchema globalSchema = sset.getSchema("");
    // local definitions of enums are in complex types
    ctiter = globalSchema.iterateComplexTypes();
    while (ctiter.hasNext())
    {
      XSComplexType ct = (XSComplexType) ctiter.next();
      String typeName = ct.getName();
      String baseTypeName = ct.getBaseType().getName();
      System.out.println(typeName + " is a " + baseTypeName);
    }

    // =========================================================
    // the main entity of this file is in the Elements
    // there should only be one!
    if (globalSchema.getElementDecls().size() != 1)
    {
      throw new Exception("Should be only elment type per file.");
    }

    XSElementDecl ed = globalSchema.getElementDecls().values()
        .toArray(new XSElementDecl[0])[0];
    String entityType = ed.getName();
    XSContentType xsContentType = ed.getType().asComplexType().getContentType();
    XSParticle particle = xsContentType.asParticle();
    if (particle != null)
    {

      XSTerm term = particle.getTerm();
      if (term.isModelGroup())
      {
        XSModelGroup xsModelGroup = term.asModelGroup();
        term.asElementDecl();
        XSParticle[] particles = xsModelGroup.getChildren();
        String propertyName = null;
        String propertyType = null;
        XSParticle pp =particles[0];
        for (XSParticle p : particles)
        {
          XSTerm pterm = p.getTerm();
          if (pterm.isElementDecl())
          {            
            propertyName = pterm.asElementDecl().getName();
            if (pterm.asElementDecl().getType().getName() == null)
            {
              propertyType = pterm.asElementDecl().getType().getBaseType().getName();
            }
            else
            {
              propertyType = pterm.asElementDecl().getType().getName();              
            }
            System.out.println(propertyName + " is a " + propertyType);
          }
        }
      }
    }
    return;
  }
}   

The output from this is:

输出结果是：

ENUM is a string
STRING is a string
eSTATUS is a ENUM
eYN is a ENUM
Valid is a eYN
Cal is a STRING
Status is a eSTATUS