A Content Handler to Output a Sorted List : SAX « XML « Java

1. Java
2. XML
3. SAX

A Content Handler to Output a Sorted List

      
import java.io.PrintWriter;
import java.util.Vector;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;

public class MyTextHandler implements ContentHandler {
  private boolean insideNameElement = false;

  private boolean insidePhoneElement = false;

  private boolean insideEmailElement = false;

  private Person person;

  private Vector personVec;

  private PrintWriter out;

  public MyTextHandler(PrintWriter out) {
    this.out = out;
    personVec = new Vector();
  }

  public void setDocumentLocator(Locator locator) {
  }

  public void startDocument() {
    putCols(" name", " phone", " email");
    putCols(" ----", " -----", " -----");
  }

  public void endDocument() {
    int k1 = 1;
    while (k1 < personVec.size()) {
      int k0 = k1 - 1;
      Person p0 = (Person) personVec.elementAt(k0);
      Person p1 = (Person) personVec.elementAt(k1);
      if (p0.getName().compareTo(p1.getName()) > 0) {
        personVec.setElementAt(p0, k1);
        personVec.setElementAt(p1, k0);
        if (k1 > 1)
          k1--;
      } else {
        k1++;
      }
    }

    for (int i = 0; i < personVec.size(); i++) {
      Person p = (Person) personVec.elementAt(i);
      putCols(p.getName(), p.getPhone(), p.getEmail());
    }
  }

  public void startPrefixMapping(String prefix, String uri) {
  }

  public void endPrefixMapping(String prefix) {
  }

  public void startElement(String namespaceURI, String localName,
      String qName, Attributes atts) {
    if (localName.equals("person")) {
      person = new Person();
    } else if (localName.equals("name")) {
      insideNameElement = true;
    } else if (localName.equals("phone")) {
      insidePhoneElement = true;
    } else if (localName.equals("email")) {
      insideEmailElement = true;
    }
  }

  public void endElement(String namespaceURI, String localName, String qName) {
    if (localName.equals("person")) {
      if (person != null)
        personVec.addElement(person);
    } else if (localName.equals("name")) {
      insideNameElement = false;
    } else if (localName.equals("phone")) {
      insidePhoneElement = false;
    } else if (localName.equals("email")) {
      insideEmailElement = false;
    }
  }

  public void characters(char[] ch, int start, int length) {
    String str = "";
    for (int i = start; i < start + length; i++)
      str += ch[i];
    if (insideNameElement)
      person.setName(str);
    else if (insidePhoneElement)
      person.setPhone(str);
    else if (insideEmailElement)
      person.setEmail(str);
  }

  public void ignorableWhitespace(char[] ch, int start, int length) {
  }

  public void processingInstruction(String target, String data) {
  }

  public void skippedEntity(String name) {
  }

  private void putCols(String col1, String col2, String col3) {
    String lout = col1;
    while (lout.length() < 25)
      lout += " ";
    lout += col2;
    while (lout.length() < 50)
      lout += " ";
    lout += col3;
    out.println(lout);
  }
}

// A Class for Holding Person Information

class Person {
  private String name = null;

  private String phone = null;

  private String email = null;

  public void setName(String value) {
    name = value;
  }

  public void setPhone(String value) {
    phone = value;
  }

  public void setEmail(String value) {
    email = value;
  }

  public String getName() {
    if (name == null)
      return ("none");
    return (name);
  }

  public String getPhone() {
    if (phone == null)
      return ("none");
    return (phone);
  }

  public String getEmail() {
    if (email == null)
      return ("none");
    return (email);
  }
}
//Example XML document
/*
 An XML Document Containing a Simple Contact List
Start example

<?xml version="1.0" standalone="yes"?>

<folks>
    <person>
        <phone>306 555-9999</phone>
        <email>joe@webserver.net</email>
        <name>Wang, Joe</name>
    </person>
    <person>
        <phone>704 555-0000</phone>
        <name>Pet, Rob</name>
        <email>rob@server.com</email>
    </person>
</folks>

*/


           
         
    
    
    
    
    
  

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