Revision 388
Added by Matt Jones over 23 years ago
| src/edu/ucsb/nceas/metacat/ElementNode.java | ||
|---|---|---|
| 16 | 16 |
|
| 17 | 17 |
import java.sql.*; |
| 18 | 18 |
import java.io.IOException; |
| 19 |
import java.util.Enumeration; |
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import java.util.Iterator; |
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import java.util.TreeSet; |
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| 19 | 22 |
import java.util.Vector; |
| 20 |
import java.util.Enumeration; |
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| 21 | 23 |
|
| 22 | 24 |
/** |
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* A Class that represents an XML element and its contents, |
| ... | ... | |
| 25 | 27 |
*/ |
| 26 | 28 |
public class ElementNode extends BasicNode {
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| 27 | 29 |
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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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|
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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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|
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// Create child nodes (elements or attributes) |
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setChildrenNodes(nodeid); |
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} |
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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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} |
| 125 |
|
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// Record our node type |
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setNodeType(nodetype); |
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|
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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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} |
| 96 |
} |
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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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} |
|
| 178 | 121 |
|
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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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|
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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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// 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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| 210 |
} |
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| 211 |
} catch (SQLException e) {
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| 212 |
System.out.println("Error with getrset: " + e.getMessage());
|
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| 213 |
} |
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pstmt.close(); |
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| 215 |
} catch (SQLException e) {
|
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| 216 |
System.out.println("Error getting id: " + e.getMessage());
|
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} |
|
| 218 |
|
|
| 122 |
if (nodetype.equals("ELEMENT")) {
|
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value.append("</");
|
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value.append(getTagName()); |
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value.append('>');
|
|
| 219 | 126 |
} |
| 220 | 127 |
|
| 221 |
/** |
|
| 222 |
* String representation for display purposes (recursively descends through |
|
| 223 |
* children to create an XML subtree) |
|
| 224 |
*/ |
|
| 225 |
public String toString () {
|
|
| 226 |
|
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| 227 |
StringBuffer value = new StringBuffer(); |
|
| 228 |
String nodetype = getNodeType(); |
|
| 229 |
|
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| 230 |
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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} |
|
| 236 |
|
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| 237 |
// Process children recursively here |
|
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BasicNode child = null; |
|
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Enumeration e = getChildren(); |
|
| 240 |
while (e.hasMoreElements()) {
|
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| 241 |
child = (BasicNode)e.nextElement(); |
|
| 242 |
value.append(child); |
|
| 243 |
} |
|
| 244 |
|
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| 245 |
if (nodetype.equals("ELEMENT")) {
|
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| 246 |
value.append("</");
|
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| 247 |
value.append(getTagName()); |
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| 248 |
value.append('>');
|
|
| 249 |
} |
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| 250 |
|
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| 251 |
return value.toString(); |
|
| 252 |
} |
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| 128 |
return value.toString(); |
|
| 129 |
} |
|
| 253 | 130 |
} |
| 254 |
|
|
| 255 |
/** |
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| 256 |
* '$Log$ |
|
| 257 |
* 'Revision 1.21 2000/06/28 02:36:26 jones |
|
| 258 |
* 'Added feature to now ouput COMMENTs and PIs when the document is |
|
| 259 |
* 'read from the database with DBReader. |
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| 260 |
* ' |
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| 261 |
* 'Revision 1.20 2000/06/26 10:35:05 jones |
|
| 262 |
* 'Merged in substantial changes to DBWriter and associated classes and to |
|
| 263 |
* 'the MetaCatServlet in order to accomodate the new UPDATE and DELETE |
|
| 264 |
* 'functions. The command line tools and the parameters for the |
|
| 265 |
* 'servlet have changed substantially. |
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| 266 |
* ' |
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| 267 |
* 'Revision 1.19.2.2 2000/06/25 23:38:16 jones |
|
| 268 |
* 'Added RCSfile keyword |
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| 269 |
* ' |
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| 270 |
* 'Revision 1.19.2.1 2000/06/25 23:34:18 jones |
|
| 271 |
* 'Changed documentation formatting, added log entries at bottom of source files |
|
| 272 |
* '' |
|
| 273 |
*/ |
|
| src/edu/ucsb/nceas/metacat/DBReader.java | ||
|---|---|---|
| 14 | 14 |
|
| 15 | 15 |
package edu.ucsb.nceas.metacat; |
| 16 | 16 |
|
| 17 |
import java.io.*; |
|
| 18 | 17 |
import java.sql.*; |
| 18 |
import java.io.PrintWriter; |
|
| 19 |
import java.util.TreeSet; |
|
| 19 | 20 |
|
| 20 | 21 |
/** |
| 21 | 22 |
* A Class that creates an XML text document |
| ... | ... | |
| 75 | 76 |
} |
| 76 | 77 |
|
| 77 | 78 |
/** |
| 78 |
* Get the root node id for an XML document given a document id
|
|
| 79 |
* Create an XML document from the database for the document with ID docid
|
|
| 79 | 80 |
* |
| 80 |
* @param docid the document node contains the root of the document |
|
| 81 |
* @returns long the nodeid of the root node for this document |
|
| 81 |
* @param docid the document identifier that we want retrieved |
|
| 82 | 82 |
*/ |
| 83 |
private long getRootNode(String docid) |
|
| 84 |
throws McdbDocNotFoundException |
|
| 85 |
{
|
|
| 86 |
// Now look up the root node id |
|
| 87 |
long rootnodeid = 0; |
|
| 88 |
|
|
| 89 |
try {
|
|
| 90 |
PreparedStatement pstmt = |
|
| 91 |
conn.prepareStatement("SELECT rootnodeid " +
|
|
| 92 |
"FROM xml_documents " + |
|
| 93 |
"WHERE docid = ?"); |
|
| 94 |
// Bind the values to the query |
|
| 95 |
pstmt.setString(1, docid); |
|
| 96 |
|
|
| 97 |
pstmt.execute(); |
|
| 98 |
ResultSet rs = pstmt.getResultSet(); |
|
| 99 |
boolean tableHasRows = rs.next(); |
|
| 100 |
if (tableHasRows) {
|
|
| 101 |
rootnodeid = rs.getLong(1); |
|
| 102 |
|
|
| 103 |
} |
|
| 104 |
pstmt.close(); |
|
| 105 |
} catch (SQLException e) {
|
|
| 106 |
throw new McdbDocNotFoundException( |
|
| 107 |
"Root node not found for: " + docid, e); |
|
| 108 |
} |
|
| 109 |
|
|
| 110 |
return rootnodeid; |
|
| 111 |
} |
|
| 112 |
|
|
| 113 |
/** |
|
| 114 |
* Create an XML document from the database starting with the element |
|
| 115 |
* having element_id nodeid |
|
| 116 |
* |
|
| 117 |
* @param docid the document that we want retrieved |
|
| 118 |
*/ |
|
| 119 | 83 |
public String readXMLDocument(String docid) |
| 120 | 84 |
throws McdbException |
| 121 | 85 |
{
|
| 122 | 86 |
try {
|
| 123 | 87 |
StringBuffer doc = new StringBuffer(); |
| 88 |
|
|
| 89 |
// Look up the document information |
|
| 124 | 90 |
DoctypeInfo dti = getDoctypeInfo(docid); |
| 125 |
|
|
| 126 | 91 |
String docname = dti.getDocname(); |
| 127 | 92 |
String doctype = dti.getDoctype(); |
| 128 | 93 |
String sysid = dti.getSystemID(); |
| 94 |
long rootnodeid = dti.getRootNodeID(); |
|
| 129 | 95 |
|
| 130 |
ElementNode element = new ElementNode(conn, getRootNode(docid)); |
|
| 96 |
// Download all of the document nodes using a single SQL query |
|
| 97 |
TreeSet nodeRecordList = getNodeRecordList(docid); |
|
| 98 |
|
|
| 99 |
// Create the elements from the downloaded nodes |
|
| 100 |
//ElementNode element = new ElementNode(conn, rootnodeid); |
|
| 101 |
ElementNode element = new ElementNode(nodeRecordList, rootnodeid); |
|
| 102 |
|
|
| 103 |
// Append the resulting document to the StringBuffer |
|
| 131 | 104 |
doc.append("<?xml version=\"1.0\"?>\n");
|
| 132 | 105 |
|
| 133 | 106 |
if (docname != null) {
|
| ... | ... | |
| 155 | 128 |
* @param docid the id of the document to look up |
| 156 | 129 |
*/ |
| 157 | 130 |
public DoctypeInfo getDoctypeInfo(String docid) |
| 158 |
throws McdbException |
|
| 131 |
throws McdbException
|
|
| 159 | 132 |
{
|
| 160 | 133 |
PreparedStatement pstmt; |
| 161 | 134 |
String doctype = null; |
| 162 | 135 |
String docname = null; |
| 163 | 136 |
String sysid = null; |
| 137 |
long rootnodeid = 0; |
|
| 164 | 138 |
DoctypeInfo dti = null; |
| 165 | 139 |
|
| 166 | 140 |
try {
|
| 167 | 141 |
pstmt = |
| 168 |
conn.prepareStatement("SELECT docname,doctype " +
|
|
| 142 |
conn.prepareStatement("SELECT docname,doctype,rootnodeid " +
|
|
| 169 | 143 |
"FROM xml_documents " + |
| 170 | 144 |
"WHERE docid = ?"); |
| 171 | 145 |
// Bind the values to the query |
| ... | ... | |
| 175 | 149 |
ResultSet rs = pstmt.getResultSet(); |
| 176 | 150 |
boolean tableHasRows = rs.next(); |
| 177 | 151 |
if (tableHasRows) {
|
| 178 |
docname = rs.getString(1); |
|
| 179 |
doctype = rs.getString(2); |
|
| 152 |
docname = rs.getString(1); |
|
| 153 |
doctype = rs.getString(2); |
|
| 154 |
rootnodeid = rs.getLong(3); |
|
| 180 | 155 |
} |
| 181 | 156 |
pstmt.close(); |
| 182 | 157 |
|
| ... | ... | |
| 201 | 176 |
} |
| 202 | 177 |
|
| 203 | 178 |
if (docname != null) {
|
| 204 |
dti = new DoctypeInfo(docname, doctype, sysid); |
|
| 179 |
dti = new DoctypeInfo(docname, doctype, sysid, rootnodeid);
|
|
| 205 | 180 |
return dti; |
| 206 | 181 |
} else {
|
| 207 | 182 |
throw new McdbDocNotFoundException("Document not found: " + docid);
|
| ... | ... | |
| 209 | 184 |
} |
| 210 | 185 |
|
| 211 | 186 |
/** |
| 187 |
* Look up the node data from the database |
|
| 188 |
* |
|
| 189 |
* @param docid the id of the document to look up |
|
| 190 |
*/ |
|
| 191 |
public TreeSet getNodeRecordList(String docid) |
|
| 192 |
throws McdbException |
|
| 193 |
{
|
|
| 194 |
PreparedStatement pstmt; |
|
| 195 |
TreeSet nodeRecordList = new TreeSet(new NodeComparator()); |
|
| 196 |
long nodeid = 0; |
|
| 197 |
long parentnodeid = 0; |
|
| 198 |
long nodeindex = 0; |
|
| 199 |
String nodetype = null; |
|
| 200 |
String nodename = null; |
|
| 201 |
String nodedata = null; |
|
| 202 |
|
|
| 203 |
try {
|
|
| 204 |
pstmt = |
|
| 205 |
conn.prepareStatement("SELECT nodeid,parentnodeid,nodeindex, " +
|
|
| 206 |
"nodetype,nodename,"+ |
|
| 207 |
"replace(" +
|
|
| 208 |
"replace(" +
|
|
| 209 |
"replace(nodedata,'&','&') " + |
|
| 210 |
",'<','<') " + |
|
| 211 |
",'>','>') " + |
|
| 212 |
"FROM xml_nodes WHERE docid = ?"); |
|
| 213 |
|
|
| 214 |
// Bind the values to the query |
|
| 215 |
pstmt.setString(1, docid); |
|
| 216 |
|
|
| 217 |
pstmt.execute(); |
|
| 218 |
ResultSet rs = pstmt.getResultSet(); |
|
| 219 |
boolean tableHasRows = rs.next(); |
|
| 220 |
while (tableHasRows) {
|
|
| 221 |
nodeid = rs.getLong(1); |
|
| 222 |
parentnodeid = rs.getLong(2); |
|
| 223 |
nodeindex = rs.getLong(3); |
|
| 224 |
nodetype = rs.getString(4); |
|
| 225 |
nodename = rs.getString(5); |
|
| 226 |
nodedata = rs.getString(6); |
|
| 227 |
|
|
| 228 |
// add the data to the node record list hashtable |
|
| 229 |
NodeRecord currentRecord = new NodeRecord(nodeid, parentnodeid, |
|
| 230 |
nodeindex, nodetype, nodename, nodedata); |
|
| 231 |
nodeRecordList.add(currentRecord); |
|
| 232 |
|
|
| 233 |
// Advance to the next node |
|
| 234 |
tableHasRows = rs.next(); |
|
| 235 |
} |
|
| 236 |
pstmt.close(); |
|
| 237 |
|
|
| 238 |
} catch (SQLException e) {
|
|
| 239 |
throw new McdbException("Error accessing database connection.", e);
|
|
| 240 |
} |
|
| 241 |
|
|
| 242 |
if (nodeRecordList != null) {
|
|
| 243 |
return nodeRecordList; |
|
| 244 |
} else {
|
|
| 245 |
throw new McdbException("Error getting node data: " + docid);
|
|
| 246 |
} |
|
| 247 |
} |
|
| 248 |
|
|
| 249 |
/** |
|
| 212 | 250 |
* A utility class that encapsulates document type information |
| 213 | 251 |
*/ |
| 214 | 252 |
public class DoctypeInfo {
|
| 215 | 253 |
private String docname = null; |
| 216 | 254 |
private String doctype = null; |
| 217 | 255 |
private String system_id = null; |
| 256 |
private long rootnodeid; |
|
| 218 | 257 |
|
| 219 | 258 |
/** |
| 220 | 259 |
* Constructor |
| 221 | 260 |
*/ |
| 222 |
public DoctypeInfo(String docname, String doctype, String system_id) {
|
|
| 261 |
public DoctypeInfo(String docname, String doctype, |
|
| 262 |
String system_id, long rootnodeid) {
|
|
| 223 | 263 |
this.docname = docname; |
| 224 | 264 |
this.doctype = doctype; |
| 225 | 265 |
this.system_id = system_id; |
| 266 |
this.rootnodeid = rootnodeid; |
|
| 226 | 267 |
} |
| 227 | 268 |
|
| 228 | 269 |
/** |
| ... | ... | |
| 245 | 286 |
public String getSystemID() {
|
| 246 | 287 |
return system_id; |
| 247 | 288 |
} |
| 289 |
|
|
| 290 |
/** |
|
| 291 |
* get the root node identifier |
|
| 292 |
*/ |
|
| 293 |
public long getRootNodeID() {
|
|
| 294 |
return rootnodeid; |
|
| 295 |
} |
|
| 248 | 296 |
} |
| 249 |
|
|
| 250 | 297 |
} |
| 251 |
|
|
| 252 |
/** |
|
| 253 |
* '$Log$ |
|
| 254 |
* 'Revision 1.19 2000/08/11 22:20:04 jones |
|
| 255 |
* 'Changed exception handling mechanisms for DBReader |
|
| 256 |
* ' |
|
| 257 |
* 'Revision 1.18 2000/08/10 22:39:04 jones |
|
| 258 |
* 'changed getRootNode method from public to private |
|
| 259 |
* ' |
|
| 260 |
* 'Revision 1.17 2000/06/26 10:35:05 jones |
|
| 261 |
* 'Merged in substantial changes to DBWriter and associated classes and to |
|
| 262 |
* 'the MetaCatServlet in order to accomodate the new UPDATE and DELETE |
|
| 263 |
* 'functions. The command line tools and the parameters for the |
|
| 264 |
* 'servlet have changed substantially. |
|
| 265 |
* ' |
|
| 266 |
* 'Revision 1.16.2.2 2000/06/25 23:38:16 jones |
|
| 267 |
* 'Added RCSfile keyword |
|
| 268 |
* ' |
|
| 269 |
* 'Revision 1.16.2.1 2000/06/25 23:34:17 jones |
|
| 270 |
* 'Changed documentation formatting, added log entries at bottom of source files |
|
| 271 |
* '' |
|
| 272 |
*/ |
|
| src/edu/ucsb/nceas/metacat/NodeComparator.java | ||
|---|---|---|
| 1 |
/** |
|
| 2 |
* '$RCSfile$' |
|
| 3 |
* Purpose: A Class that sorts two NodeRecords |
|
| 4 |
* Copyright: 2000 Regents of the University of California and the |
|
| 5 |
* National Center for Ecological Analysis and Synthesis |
|
| 6 |
* Authors: Matt Jones |
|
| 7 |
* Release: @release@ |
|
| 8 |
* |
|
| 9 |
* '$Author$' |
|
| 10 |
* '$Date$' |
|
| 11 |
* '$Revision$' |
|
| 12 |
*/ |
|
| 13 |
|
|
| 14 |
package edu.ucsb.nceas.metacat; |
|
| 15 |
|
|
| 16 |
import java.util.Comparator; |
|
| 17 |
|
|
| 18 |
/** |
|
| 19 |
* A utility class that sorts two node records |
|
| 20 |
*/ |
|
| 21 |
public class NodeComparator implements Comparator {
|
|
| 22 |
|
|
| 23 |
static int LESS = -1; |
|
| 24 |
static int EQUALS = 0; |
|
| 25 |
static int GREATER = 1; |
|
| 26 |
|
|
| 27 |
/** |
|
| 28 |
* Constructor |
|
| 29 |
*/ |
|
| 30 |
public NodeComparator() {
|
|
| 31 |
} |
|
| 32 |
|
|
| 33 |
/** |
|
| 34 |
* compare two objects to determine proper sort order |
|
| 35 |
*/ |
|
| 36 |
public int compare(Object o1, Object o2) {
|
|
| 37 |
return compare((NodeRecord)o1, (NodeRecord)o2); |
|
| 38 |
} |
|
| 39 |
|
|
| 40 |
/** |
|
| 41 |
* compare two NodeRecord objects to determine proper sort order. The |
|
| 42 |
* node records are equal if their nodeid fields are equal. One is |
|
| 43 |
* less than another if its parentnodeid is less, or if its parentnodeid |
|
| 44 |
* is equal and its nodeindex is less. One is greater than another if |
|
| 45 |
* its parentnodeid is greater, or if its parentnodeid is equal and |
|
| 46 |
* its nodeindex is greater. |
|
| 47 |
*/ |
|
| 48 |
private int compare(NodeRecord o1, NodeRecord o2) {
|
|
| 49 |
if (o1.nodeid == o2.nodeid) {
|
|
| 50 |
return EQUALS; |
|
| 51 |
} else if (o1.parentnodeid < o2.parentnodeid) {
|
|
| 52 |
return LESS; |
|
| 53 |
} else if (o1.parentnodeid > o2.parentnodeid) {
|
|
| 54 |
return GREATER; |
|
| 55 |
} else if (o1.parentnodeid == o2.parentnodeid) {
|
|
| 56 |
if (o1.nodeindex < o2.nodeindex) {
|
|
| 57 |
return LESS; |
|
| 58 |
} else if (o1.nodeindex > o2.nodeindex) {
|
|
| 59 |
return GREATER; |
|
| 60 |
} else {
|
|
| 61 |
// this should never happen because (parentnodeid,nodeindex) is unique |
|
| 62 |
return EQUALS; |
|
| 63 |
} |
|
| 64 |
} else {
|
|
| 65 |
// this should never happen because parentnodeid is always <,>, or = |
|
| 66 |
return EQUALS; |
|
| 67 |
} |
|
| 68 |
} |
|
| 69 |
} |
|
| 0 | 70 | |
| src/edu/ucsb/nceas/metacat/NodeRecord.java | ||
|---|---|---|
| 1 |
/** |
|
| 2 |
* '$RCSfile$' |
|
| 3 |
* Purpose: A Class that represents all node info from the database |
|
| 4 |
* Copyright: 2000 Regents of the University of California and the |
|
| 5 |
* National Center for Ecological Analysis and Synthesis |
|
| 6 |
* Authors: Matt Jones |
|
| 7 |
* Release: @release@ |
|
| 8 |
* |
|
| 9 |
* '$Author$' |
|
| 10 |
* '$Date$' |
|
| 11 |
* '$Revision$' |
|
| 12 |
*/ |
|
| 13 |
|
|
| 14 |
package edu.ucsb.nceas.metacat; |
|
| 15 |
|
|
| 16 |
/** |
|
| 17 |
* A utility class that encapsulates a node and its data |
|
| 18 |
*/ |
|
| 19 |
public class NodeRecord {
|
|
| 20 |
public long nodeid; |
|
| 21 |
public long parentnodeid; |
|
| 22 |
public long nodeindex; |
|
| 23 |
public String nodename = null; |
|
| 24 |
public String nodetype = null; |
|
| 25 |
public String nodedata = null; |
|
| 26 |
|
|
| 27 |
/** |
|
| 28 |
* Constructor |
|
| 29 |
*/ |
|
| 30 |
public NodeRecord(long nodeid, long parentnodeid, long nodeindex, |
|
| 31 |
String nodetype, String nodename, String nodedata) {
|
|
| 32 |
this.nodeid = nodeid; |
|
| 33 |
this.parentnodeid = parentnodeid; |
|
| 34 |
this.nodeindex = nodeindex; |
|
| 35 |
this.nodename = nodename; |
|
| 36 |
this.nodetype = nodetype; |
|
| 37 |
this.nodedata = nodedata; |
|
| 38 |
} |
|
| 39 |
} |
|
| 0 | 40 | |
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.