Metacat

/**

 *        Name: BasicElement.java

 *     Purpose: A Class that represents an XML element and its contents

 * Institution: National Center for Ecological Analysis and Synthesis

 *   Copyright: 2000

 *     Authors: Matt Jones

 *

 *     Version: '$Id: BasicElement.java 21 2000-04-11 20:26:43Z jones $'

 */

//package project;

import java.io.IOException;

import java.util.Hashtable;

import java.util.Enumeration;

public class BasicElement {

    protected long		element_id;

    protected String		tagname;

    protected StringBuffer	content;

    protected long		parent_id;

    protected Hashtable		attributes;

    public BasicElement (String tagname, long parent_id) {

      this.tagname = tagname;

      this.parent_id = parent_id;

      content = new StringBuffer();

      attributes = new Hashtable(); 

    }

    public BasicElement (long element_id, String tagname, long parent_id) {

      this(tagname,parent_id);

      this.element_id = element_id;

    }

    // used by JTree to display this node

    public String toString ()

    {

	StringBuffer	value = new StringBuffer ();

	value.append ('<');

	value.append (getTagName ());

	value.append (getAttributes ().toString ());

	value.append ('>');

	return value.toString ();

    }

    /** Get the id of this element */

    public long  getElementID() { return element_id; }

    /** Get the name of this element */

    public String  getTagName() { return tagname; }

    /** Get the attributes as a string */

    public String getAttributes() {

      StringBuffer buf = new StringBuffer();

      String attName = null;

      String attValue = null;

      Enumeration attList = attributes.keys();

      while (attList.hasMoreElements()) {

        attName = (String)attList.nextElement();

        attValue = (String)attributes.get(attName);

        buf.append(" ").append(attName).append("=").append(attValue);        

      }

      return buf.toString();      

    }

    /** Add a new attribute to this element, or set its value */

    public void setAttribute(String attName, String attValue) {

      if (attName != null) {

        // Enter the attribute in the hash table

        attributes.put(attName, attValue);

      } else {

        System.err.println("Attribute name must not be null!");

      }

    }

    /** Get an attribute value by name */

    public String getAttribute(String attName) {

      return (String)attributes.get(attName);

    }

    /** Append to the content of the element */

    public void appendContent(char[] cbuf, int start, int len) {

      this.content.append( cbuf, start, len );

    }

    /** Append to the content of the element */

    public void appendContent(String new_content) {

      this.content.append( new_content );

    }

    /** Get the content of the element */

    public String getContent() {

      return this.content.toString();

    }

}