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/**
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* Name: DBSAXElement.java
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* Purpose: A Class that represents an XML element and its contents
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* Institution: National Center for Ecological Analysis and Synthesis
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* Copyright: 2000
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* Authors: Matt Jones
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*
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* Version: '$Id$'
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*/
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//package project;
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import java.sql.*;
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import java.io.IOException;
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import java.util.Hashtable;
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import java.util.Enumeration;
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public class DBSAXElement {
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private long element_id;
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private String tagname;
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private StringBuffer content;
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private long parent_id;
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private Hashtable attributes;
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private Connection conn;
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public DBSAXElement (Connection conn, String tagname,
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long parent_id) {
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this.conn = conn;
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this.tagname = tagname;
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this.parent_id = parent_id;
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content = new StringBuffer();
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attributes = new Hashtable();
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writeElementToDB();
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};
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/** creates SQL code and inserts new element into DB connection */
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private void writeElementToDB() {
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try {
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conn.setAutoCommit(false);
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PreparedStatement pstmt;
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if (parent_id != 0) {
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_nodes (nodeid, nodetype, " +
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"nodename, parentnodeid) VALUES (null, ?, ?, ?)");
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} else {
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pstmt = conn.prepareStatement(
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"INSERT INTO xml_nodes (nodeid, nodetype, nodename) " +
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"VALUES (null, ?, ?)");
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}
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// Bind the values to the query
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pstmt.setString(1, "ELEMENT");
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pstmt.setString(2, getTagName());
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if (parent_id != 0) {
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pstmt.setLong(3, parent_id);
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}
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// Do the insertion
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pstmt.execute();
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pstmt.close();
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this.element_id = getAssignedElementID();
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conn.commit();
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conn.setAutoCommit(true);
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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}
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/** look up the assigned element id from DB connection */
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private long getAssignedElementID() {
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long assigned_id=0;
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Statement stmt;
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try {
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stmt = conn.createStatement();
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stmt.execute("SELECT xml_nodes_id_seq.currval FROM dual");
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try {
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ResultSet rs = stmt.getResultSet();
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try {
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boolean tableHasRows = rs.next();
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if (tableHasRows) {
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try {
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assigned_id = rs.getLong(1);
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} catch (SQLException e) {
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System.out.println("Error with getInt: " + e.getMessage());
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}
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}
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} catch (SQLException e) {
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System.out.println("Error with next: " + e.getMessage());
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}
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} catch (SQLException e) {
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System.out.println("Error with getrset: " + e.getMessage());
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}
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stmt.close();
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} catch (SQLException e) {
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System.out.println("Error getting id: " + e.getMessage());
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}
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// assign the new ID number
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return assigned_id;
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}
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// used by JTree to display this node
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public String toString ()
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{
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StringBuffer value = new StringBuffer ();
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value.append ('<');
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value.append (getTagName ());
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value.append (getAttributes ().toString ());
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value.append ('>');
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return value.toString ();
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}
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/** Get the id of this element */
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public long getElementID() { return element_id; }
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/** Get the name of this element */
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public String getTagName() { return tagname; }
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/** Get the attributes as a string */
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public String getAttributes() {
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StringBuffer buf = new StringBuffer();
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String attName = null;
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String attValue = null;
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Enumeration attList = attributes.keys();
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while (attList.hasMoreElements()) {
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attName = (String)attList.nextElement();
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attValue = (String)attributes.get(attName);
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buf.append(" ").append(attName).append("=").append(attValue);
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}
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return buf.toString();
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}
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/** Add a new attribute to this element, or set its value */
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public void setAttribute(String attName, String attValue) {
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if (attName != null) {
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// Enter the attribute in the hash table
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attributes.put(attName, attValue);
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// And enter the attribute in the database
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try {
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PreparedStatement pstmt = conn.prepareStatement(
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"INSERT INTO xml_nodes (nodeid, nodetype, " +
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"nodename, nodedata, parentnodeid) VALUES (null, ?, ?, ?, ?)");
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// Bind the values to the query
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pstmt.setString(1, "ATTRIBUTE");
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pstmt.setString(2, attName);
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pstmt.setString(3, attValue);
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pstmt.setLong(4, getElementID());
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// Do the insertion
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pstmt.execute();
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pstmt.close();
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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} else {
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System.err.println("Attribute name must not be null!");
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}
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}
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/** Get an attribute value by name */
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public String getAttribute(String attName) {
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return (String)attributes.get(attName);
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}
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/** Append to the content of the element */
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public void appendContent(char[] cbuf, int start, int len) {
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this.content.append( cbuf, start, len );
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}
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/** Append to the content of the element */
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public void appendContent(String new_content) {
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this.content.append( new_content );
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}
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/** Get the content of the element */
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public String getContent() {
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return this.content.toString();
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}
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/** Write the element content to the db connection */
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public void writeContentToDB() {
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try {
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PreparedStatement pstmt = conn.prepareStatement(
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"UPDATE xml_nodes SET nodedata = ? WHERE nodeid = ?");
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// Bind the values to the query
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pstmt.setString(1, getContent());// The first ? is for NODEDATA
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pstmt.setLong(2, element_id); // The second ? is for NODEID
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// Do the update
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pstmt.execute();
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pstmt.close();
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} catch (SQLException e) {
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System.out.println(e.getMessage());
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}
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}
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}
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