introspectiondocument.java

编写rest实例 rest分布式框架在app中的应用

package com.jeffhanson.atompub.introspect;

import java.io.File;
import java.io.OutputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;

import com.jeffhanson.atompub.DOMDataSource;
import com.jeffhanson.atompub.DOMUtils;
import com.jeffhanson.rest.core.Representation;

public class IntrospectionDocument extends Representation
{
  public static final String MEDIA_TYPE = "application/atomserv+xml";  
  public static final String CONTENT_TYPE = MEDIA_TYPE + "; charset=utf-8";
  
  public static IntrospectionDocument parse(File serviceDocFile)
    throws ServiceDocumentException
  {
    try
    {
      DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
      org.w3c.dom.Document doc = builder.parse(serviceDocFile);
      doc.normalize();

      return new IntrospectionDocument(doc);
    }
    catch (Exception e)
    {
      e.printStackTrace();
      throw new ServiceDocumentException(e);
    }
  }

  private Document doc = null;
  private ServiceNode service = null;

  public IntrospectionDocument(Document doc)
  {
    super(new DOMDataSource(IntrospectionDocument.class.getName(),
                            doc,
                            CONTENT_TYPE));
    
    this.doc = doc;
    Node node = DOMUtils.getChildNode(doc, "service");
    if (node != null)
    {
      service = new ServiceNode(node);
    }
  }

  public ServiceNode getService()
  {
    return service;
  }

  public void write(OutputStream out)
      throws ServiceDocumentException
  {
    DOMUtils.write(doc, out);
  }
}