Revision 388
Added by Matt Jones over 23 years ago
| ElementNode.java | ||
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import java.sql.*; |
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import java.io.IOException; |
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import java.util.Enumeration; |
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import java.util.Iterator; |
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import java.util.TreeSet; |
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import java.util.Vector; |
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import java.util.Enumeration; |
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/** |
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* A Class that represents an XML element and its contents, |
| ... | ... | |
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*/ |
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public class ElementNode extends BasicNode {
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private Connection conn; |
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/** |
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* Construct a new ElementNode instance, and recursively create its children |
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* |
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* @param nodeRecordList the nodedata to use to initialize, which is a |
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* TreeSet of NodeRecord objects |
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* @param nodeid the identifier for the node to be created |
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*/ |
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public ElementNode (TreeSet nodeRecordList, long nodeid) {
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/** |
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* Construct a new ElementNode instance |
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* |
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* @param conn the database connection to use to initialize |
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*/ |
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public ElementNode (Connection conn) {
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this.conn = conn; |
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} |
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MetaCatUtil util = new MetaCatUtil(); |
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/** |
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* Construct a new ElementNode instance |
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* |
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* @param conn the database connection to use to initialize |
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* @param nodeid the element_id for the node to be created |
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*/ |
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public ElementNode (Connection conn, long nodeid) {
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this(conn); |
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// Step through all of the node records we were given |
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Iterator it = nodeRecordList.iterator(); |
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while (it.hasNext()) {
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NodeRecord currentNode = (NodeRecord)it.next(); |
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if (currentNode.nodeid == nodeid) {
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util.debugMessage("Got Node ID: " + currentNode.nodeid +
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" (" + currentNode.parentnodeid +
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", " + currentNode.nodeindex + |
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", " + currentNode.nodetype + ")"); |
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// Process the current node |
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setNodeType(currentNode.nodetype); |
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setNodeID(currentNode.nodeid); |
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setParentID(currentNode.parentnodeid); |
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setTagName(currentNode.nodename); |
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} else {
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// Process the children nodes |
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if (currentNode.parentnodeid == getNodeID()) {
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util.debugMessage(" Processing child: " + currentNode.nodeid +
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" (" + currentNode.parentnodeid +
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", " + currentNode.nodeindex + |
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", " + currentNode.nodetype + ")"); |
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//Lookup data for self |
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setElementInfo(nodeid); |
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//Create child nodes (elements or attributes) |
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setChildrenNodes(nodeid); |
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} |
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if ((currentNode.nodetype).equals("ELEMENT")) {
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util.debugMessage("Creating child node: " + currentNode.nodeid);
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ElementNode child = new ElementNode(nodeRecordList, |
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currentNode.nodeid); |
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addChildNode(child); |
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} else if (currentNode.nodetype.equals("ATTRIBUTE")) {
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setAttribute(currentNode.nodename,currentNode.nodedata); |
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} else if (currentNode.nodetype.equals("TEXT")) {
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TextNode child = new TextNode(currentNode.nodeid, |
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currentNode.parentnodeid, |
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currentNode.nodedata); |
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addChildNode(child); |
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} else if (currentNode.nodetype.equals("COMMENT")) {
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CommentNode child = new CommentNode(currentNode.nodeid, |
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currentNode.parentnodeid, |
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currentNode.nodedata); |
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addChildNode(child); |
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} else if (currentNode.nodetype.equals("PI")) {
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PINode child = new PINode(currentNode.nodeid, |
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currentNode.parentnodeid, |
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currentNode.nodename, |
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currentNode.nodedata); |
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addChildNode(child); |
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} |
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/** |
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* Construct a new ElementNode instance |
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* |
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* @param conn the database connection to use to initialize |
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* @param nodeid the element_id for the node to be created |
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* @param parentnodeid the id of the parent node |
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* @param nodename the name of the element |
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*/ |
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public ElementNode (Connection conn, long nodeid, long parentnodeid, |
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String nodename, String nodetype) {
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this(conn); |
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setNodeID(nodeid); |
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setParentID(parentnodeid); |
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setTagName(nodename); |
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setNodeType(nodetype); |
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// Create child nodes (elements or attributes) |
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setChildrenNodes(nodeid); |
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} |
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/** Look up the info needed to construct this element from the DB */ |
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private void setElementInfo(long nodeid) {
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long element_id=0; |
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long parentnodeid=0; |
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String nodetype=null; |
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String nodename=null; |
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String nodedata=null; |
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PreparedStatement pstmt; |
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try {
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pstmt = |
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conn.prepareStatement("SELECT nodeid,parentnodeid,nodetype,nodename,"+
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"replace(" +
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"replace(" +
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"replace(nodedata,'&','&') " + |
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",'<','<') " + |
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",'>','>') " + |
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"FROM xml_nodes WHERE nodeid = ?"); |
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// Bind the values to the query |
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pstmt.setLong(1, nodeid); |
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pstmt.execute(); |
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try {
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ResultSet rs = pstmt.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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element_id = rs.getLong(1); |
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parentnodeid = rs.getLong(2); |
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nodetype = rs.getString(3); |
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nodename = rs.getString(4); |
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nodedata = rs.getString(5); |
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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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} else {
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System.err.println("Error: no rows for nodeid: " + nodeid);
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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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} else {
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util.debugMessage(" Discarding child: " + currentNode.nodeid +
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" (" + currentNode.parentnodeid +
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", " + currentNode.nodeindex + |
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", " + currentNode.nodetype + ")"); |
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} |
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pstmt.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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// Record our node type |
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setNodeType(nodetype); |
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try {
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if (nodetype.equals("ELEMENT") || nodetype.equals("DOCUMENT") ) {
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setNodeID(element_id); |
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setParentID(parentnodeid); |
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setTagName(nodename); |
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} |
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} catch (NullPointerException npe) {
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System.err.println("Error with nodetype: " +
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nodetype + npe.getMessage()); |
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System.err.println("Nodeid: " + element_id);
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} |
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} |
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} |
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/** Look up each child node from the DB and and create it */ |
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private void setChildrenNodes(long nodeid) {
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long element_id=0; |
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long parentnodeid=0; |
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String nodetype=null; |
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String nodename=null; |
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String nodedata=null; |
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/** |
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* String representation for display purposes (recursively descends through |
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* children to create an XML subtree) |
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*/ |
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public String toString () {
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PreparedStatement pstmt; |
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try {
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pstmt = |
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conn.prepareStatement("SELECT nodeid,parentnodeid,nodetype, " +
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"nodename, " + |
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"replace(" +
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"replace(" +
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"replace(nodedata,'&','&')" + |
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",'<','<') " + |
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",'>','>') " + |
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"FROM xml_nodes WHERE parentnodeid = ? " + |
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"ORDER BY nodeindex"); |
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StringBuffer value = new StringBuffer(); |
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String nodetype = getNodeType(); |
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// Bind the values to the query |
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pstmt.setLong(1, nodeid); |
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if (nodetype.equals("ELEMENT")) {
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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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} |
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pstmt.execute(); |
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try {
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ResultSet rs = pstmt.getResultSet(); |
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try {
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boolean tableHasRows = rs.next(); |
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while (tableHasRows) {
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try {
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element_id = rs.getLong(1); |
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parentnodeid = rs.getLong(2); |
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nodetype = rs.getString(3); |
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nodename = rs.getString(4); |
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nodedata = rs.getString(5); |
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// Process children recursively here |
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BasicNode child = null; |
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Enumeration e = getChildren(); |
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while (e.hasMoreElements()) {
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child = (BasicNode)e.nextElement(); |
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value.append(child); |
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} |
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if ( (nodetype.equals("ELEMENT")) ||
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(nodetype.equals("DOCUMENT"))
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) {
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ElementNode child = new ElementNode(conn, |
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element_id,parentnodeid,nodename, nodetype); |
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addChildNode(child); |
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} else if (nodetype.equals("ATTRIBUTE")) {
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setAttribute(nodename,nodedata); |
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} else if (nodetype.equals("TEXT")) {
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TextNode child = new TextNode(element_id,parentnodeid, |
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nodedata); |
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addChildNode(child); |
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} else if (nodetype.equals("COMMENT")) {
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CommentNode child = new CommentNode(element_id,parentnodeid, |
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nodedata); |
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addChildNode(child); |
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} else if (nodetype.equals("PI")) {
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PINode child = new PINode(element_id,parentnodeid,nodename, |
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nodedata); |
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addChildNode(child); |
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} |
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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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// Advance to the next record in the cursor |
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tableHasRows = rs.next(); |
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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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pstmt.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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if (nodetype.equals("ELEMENT")) {
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value.append("</");
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value.append(getTagName()); |
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value.append('>');
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} |
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/** |
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* String representation for display purposes (recursively descends through |
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* children to create an XML subtree) |
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*/ |
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public String toString () {
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StringBuffer value = new StringBuffer(); |
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String nodetype = getNodeType(); |
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if (nodetype.equals("ELEMENT")) {
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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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} |
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// Process children recursively here |
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BasicNode child = null; |
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Enumeration e = getChildren(); |
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while (e.hasMoreElements()) {
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child = (BasicNode)e.nextElement(); |
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value.append(child); |
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} |
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if (nodetype.equals("ELEMENT")) {
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value.append("</");
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value.append(getTagName()); |
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value.append('>');
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} |
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return value.toString(); |
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} |
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return value.toString(); |
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} |
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} |
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|
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/** |
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* '$Log$ |
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* 'Revision 1.21 2000/06/28 02:36:26 jones |
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* 'Added feature to now ouput COMMENTs and PIs when the document is |
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* 'read from the database with DBReader. |
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* ' |
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* 'Revision 1.20 2000/06/26 10:35:05 jones |
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* 'Merged in substantial changes to DBWriter and associated classes and to |
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* 'the MetaCatServlet in order to accomodate the new UPDATE and DELETE |
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* 'functions. The command line tools and the parameters for the |
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* 'servlet have changed substantially. |
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* ' |
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* 'Revision 1.19.2.2 2000/06/25 23:38:16 jones |
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* 'Added RCSfile keyword |
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* ' |
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* 'Revision 1.19.2.1 2000/06/25 23:34:18 jones |
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* 'Changed documentation formatting, added log entries at bottom of source files |
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* '' |
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*/ |
|
Also available in: Unified diff
Modified the DBReader and ElementNode classes to more efficiently read
documents from the database. In the old implementation, a db connection
was opened for each and every node in a document, recursively fromthe root
node. In the new implementation, all of the data from xml_nodes is
retrieved from the database with a single query and stored in a
sorted list of NodeRecord, and the node tree is build from this data structure
recursively. This should speed up the document retieval substantially,
especially as the document repository grows.