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/**
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* '$RCSfile$'
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* Purpose: A Class that represents a structured query, and can be
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* constructed from an XML serialization conforming to
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* pathquery.dtd. The printSQL() method can be used to print
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* a SQL serialization of the query.
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Matt Jones
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*
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* '$Author$'
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* '$Date$'
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* '$Revision$'
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*/
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package edu.ucsb.nceas.metacat;
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import java.io.*;
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import java.util.Stack;
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import java.util.Vector;
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import java.util.Enumeration;
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import org.xml.sax.Attributes;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.XMLReader;
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import org.xml.sax.helpers.XMLReaderFactory;
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import org.xml.sax.helpers.DefaultHandler;
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/**
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* A Class that represents a structured query, and can be
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* constructed from an XML serialization conforming to @see pathquery.dtd.
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* The printSQL() method can be used to print a SQL serialization of the query.
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*/
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public class QuerySpecification extends DefaultHandler {
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// Query data structures
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private String meta_file_id;
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private String querytitle;
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private Vector doctypeList;
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private QueryGroup query = null;
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private Stack elementStack;
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private Stack queryStack;
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private String currentValue;
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private String currentPathexpr;
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private String parserName = null;
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/**
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* construct an instance of the QuerySpecification class
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*
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* @param queryspec the XML representation of the query (should conform
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* to pathquery.dtd) as a Reader
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* @param parserName the fully qualified name of a Java Class implementing
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* the org.xml.sax.XMLReader interface
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*/
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public QuerySpecification( Reader queryspec, String parserName )
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throws IOException {
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super();
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// Initialize the class variables
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doctypeList = new Vector();
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elementStack = new Stack();
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queryStack = new Stack();
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this.parserName = parserName;
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// Initialize the parser and read the queryspec
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XMLReader parser = initializeParser();
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if (parser == null) {
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System.err.println("SAX parser not instantiated properly.");
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}
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try {
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parser.parse(new InputSource(queryspec));
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} catch (SAXException e) {
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System.err.println("error parsing data");
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System.err.println(e.getMessage());
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}
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}
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/**
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* construct an instance of the QuerySpecification class
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*
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* @param queryspec the XML representation of the query (should conform
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* to pathquery.dtd) as a String
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* @param parserName the fully qualified name of a Java Class implementing
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* the org.xml.sax.Parser interface
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*/
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public QuerySpecification( String queryspec, String parserName )
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throws IOException {
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this(new StringReader(queryspec), parserName);
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}
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/** Main routine for testing */
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static public void main(String[] args) {
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if (args.length < 1) {
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System.err.println("Wrong number of arguments!!!");
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System.err.println("USAGE: java QuerySpecification <xmlfile>");
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return;
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} else {
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String xmlfile = args[0];
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try {
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MetaCatUtil util = new MetaCatUtil();
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FileReader xml = new FileReader(new File(xmlfile));
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QuerySpecification qspec =
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new QuerySpecification(xml, util.getOption("saxparser"));
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System.out.println(qspec.printSQL());
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} catch (IOException e) {
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System.err.println(e.getMessage());
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}
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}
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}
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/**
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* Set up the SAX parser for reading the XML serialized query
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*/
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private XMLReader initializeParser() {
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XMLReader parser = null;
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// Set up the SAX document handlers for parsing
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try {
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// Get an instance of the parser
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parser = XMLReaderFactory.createXMLReader(parserName);
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// Set the ContentHandler to this instance
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parser.setContentHandler(this);
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// Set the error Handler to this instance
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parser.setErrorHandler(this);
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} catch (Exception e) {
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System.err.println(e.toString());
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}
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return parser;
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}
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/**
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* callback method used by the SAX Parser when the start tag of an
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* element is detected. Used in this context to parse and store
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* the query information in class variables.
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*/
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public void startElement (String uri, String localName,
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String qName, Attributes atts)
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throws SAXException {
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BasicNode currentNode = new BasicNode(localName);
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// add attributes to BasicNode here
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if (atts != null) {
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int len = atts.getLength();
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for (int i = 0; i < len; i++) {
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currentNode.setAttribute(atts.getLocalName(i), atts.getValue(i));
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}
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}
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elementStack.push(currentNode);
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if (currentNode.getTagName().equals("querygroup")) {
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QueryGroup currentGroup = new QueryGroup(
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currentNode.getAttribute("operator"));
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if (query == null) {
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query = currentGroup;
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} else {
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QueryGroup parentGroup = (QueryGroup)queryStack.peek();
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parentGroup.addChild(currentGroup);
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}
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queryStack.push(currentGroup);
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}
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}
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/**
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* callback method used by the SAX Parser when the end tag of an
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* element is detected. Used in this context to parse and store
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* the query information in class variables.
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*/
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public void endElement (String uri, String localName,
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String qName) throws SAXException {
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BasicNode leaving = (BasicNode)elementStack.pop();
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159
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if (leaving.getTagName().equals("queryterm")) {
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boolean isCaseSensitive = (new Boolean(
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leaving.getAttribute("casesensitive"))).booleanValue();
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QueryTerm currentTerm = null;
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if (currentPathexpr == null) {
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currentTerm = new QueryTerm(isCaseSensitive,
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leaving.getAttribute("searchmode"),currentValue);
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} else {
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currentTerm = new QueryTerm(isCaseSensitive,
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leaving.getAttribute("searchmode"),currentValue,
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currentPathexpr);
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}
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QueryGroup currentGroup = (QueryGroup)queryStack.peek();
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currentGroup.addChild(currentTerm);
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currentValue = null;
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currentPathexpr = null;
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} else if (leaving.getTagName().equals("querygroup")) {
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QueryGroup leavingGroup = (QueryGroup)queryStack.pop();
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}
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155
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}
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158
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172
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/**
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* callback method used by the SAX Parser when the text sequences of an
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* xml stream are detected. Used in this context to parse and store
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* the query information in class variables.
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*/
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158
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public void characters(char ch[], int start, int length) {
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String inputString = new String(ch, start, length);
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BasicNode currentNode = (BasicNode)elementStack.peek();
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String currentTag = currentNode.getTagName();
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if (currentTag.equals("meta_file_id")) {
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meta_file_id = inputString;
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} else if (currentTag.equals("querytitle")) {
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querytitle = inputString;
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159
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} else if (currentTag.equals("value")) {
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currentValue = inputString;
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} else if (currentTag.equals("pathexpr")) {
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currentPathexpr = inputString;
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172
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} else if (currentTag.equals("returndoctype")) {
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doctypeList.add(inputString);
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158
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}
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}
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172
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/**
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* create a SQL serialization of the query that this instance represents
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*/
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| 230 |
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public String printSQL() {
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170
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StringBuffer self = new StringBuffer();
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172
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// This determines the returned results
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self.append("SELECT docid,docname,doctype,doctitle ");
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self.append("FROM xml_documents WHERE docid IN (");
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170
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178
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// This determines the documents that meet the query conditions
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172
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self.append(query.printSQL());
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| 240 |
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self.append(") ");
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| 241 |
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| 242 |
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// Add SQL to filter for doctypes requested in the query
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| 243 |
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if (!doctypeList.isEmpty()) {
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| 244 |
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boolean firstdoctype = true;
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| 245 |
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self.append(" AND (");
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| 246 |
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Enumeration en = doctypeList.elements();
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| 247 |
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while (en.hasMoreElements()) {
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| 248 |
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String currentDoctype = (String)en.nextElement();
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| 249 |
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if (firstdoctype) {
|
| 250 |
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firstdoctype = false;
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| 251 |
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self.append(" doctype = '" + currentDoctype + "'");
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} else {
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| 253 |
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self.append(" OR doctype = '" + currentDoctype + "'");
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| 254 |
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}
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| 255 |
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}
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| 256 |
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self.append(") ");
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| 257 |
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}
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| 258 |
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| 259 |
170
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return self.toString();
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| 260 |
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}
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| 261 |
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172
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/**
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| 263 |
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* create a String description of the query that this instance represents.
|
| 264 |
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* This should become a way to get the XML serialization of the query.
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| 265 |
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*/
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| 266 |
159
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public String toString() {
|
| 267 |
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return "meta_file_id=" + meta_file_id + "\n" +
|
| 268 |
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"querytitle=" + querytitle + "\n" + query;
|
| 269 |
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}
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| 270 |
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158
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/** a utility class that represents a group of terms in a query */
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| 272 |
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private class QueryGroup {
|
| 273 |
178
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private String operator = null; // indicates how query terms are combined
|
| 274 |
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private Vector children = null; // the list of query terms and groups
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| 275 |
158
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| 276 |
172
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/**
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| 277 |
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* construct a new QueryGroup
|
| 278 |
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*
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| 279 |
178
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* @param operator the boolean conector used to connect query terms
|
| 280 |
172
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* in this query group
|
| 281 |
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*/
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| 282 |
178
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public QueryGroup(String operator) {
|
| 283 |
|
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this.operator = operator;
|
| 284 |
158
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children = new Vector();
|
| 285 |
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}
|
| 286 |
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| 287 |
172
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/**
|
| 288 |
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* Add a child QueryGroup to this QueryGroup
|
| 289 |
|
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*
|
| 290 |
|
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* @param qgroup the query group to be added to the list of terms
|
| 291 |
|
|
*/
|
| 292 |
158
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public void addChild(QueryGroup qgroup) {
|
| 293 |
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children.add((Object)qgroup);
|
| 294 |
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}
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| 295 |
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| 296 |
172
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/**
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| 297 |
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* Add a child QueryTerm to this QueryGroup
|
| 298 |
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*
|
| 299 |
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|
* @param qterm the query term to be added to the list of terms
|
| 300 |
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*/
|
| 301 |
158
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public void addChild(QueryTerm qterm) {
|
| 302 |
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children.add((Object)qterm);
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| 303 |
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}
|
| 304 |
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| 305 |
172
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/**
|
| 306 |
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* Retrieve an Enumeration of query terms for this QueryGroup
|
| 307 |
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|
*/
|
| 308 |
158
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public Enumeration getChildren() {
|
| 309 |
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return children.elements();
|
| 310 |
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}
|
| 311 |
159
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jones
|
|
| 312 |
172
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jones
|
/**
|
| 313 |
|
|
* create a SQL serialization of the query that this instance represents
|
| 314 |
|
|
*/
|
| 315 |
|
|
public String printSQL() {
|
| 316 |
170
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jones
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StringBuffer self = new StringBuffer();
|
| 317 |
|
|
boolean first = true;
|
| 318 |
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|
| 319 |
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self.append("(");
|
| 320 |
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| 321 |
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Enumeration en= getChildren();
|
| 322 |
|
|
while (en.hasMoreElements()) {
|
| 323 |
|
|
Object qobject = en.nextElement();
|
| 324 |
|
|
if (first) {
|
| 325 |
|
|
first = false;
|
| 326 |
|
|
} else {
|
| 327 |
178
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|
self.append(" " + operator + " ");
|
| 328 |
170
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jones
|
}
|
| 329 |
|
|
if (qobject instanceof QueryGroup) {
|
| 330 |
|
|
QueryGroup qg = (QueryGroup)qobject;
|
| 331 |
172
|
jones
|
self.append(qg.printSQL());
|
| 332 |
170
|
jones
|
} else if (qobject instanceof QueryTerm) {
|
| 333 |
|
|
QueryTerm qt = (QueryTerm)qobject;
|
| 334 |
172
|
jones
|
self.append(qt.printSQL());
|
| 335 |
170
|
jones
|
} else {
|
| 336 |
|
|
System.err.println("qobject wrong type: fatal error");
|
| 337 |
|
|
}
|
| 338 |
|
|
}
|
| 339 |
|
|
self.append(") \n");
|
| 340 |
|
|
return self.toString();
|
| 341 |
|
|
}
|
| 342 |
|
|
|
| 343 |
172
|
jones
|
/**
|
| 344 |
|
|
* create a String description of the query that this instance represents.
|
| 345 |
|
|
* This should become a way to get the XML serialization of the query.
|
| 346 |
|
|
*/
|
| 347 |
159
|
jones
|
public String toString() {
|
| 348 |
|
|
StringBuffer self = new StringBuffer();
|
| 349 |
|
|
|
| 350 |
178
|
jones
|
self.append(" (Query group operator=" + operator + "\n");
|
| 351 |
159
|
jones
|
Enumeration en= getChildren();
|
| 352 |
|
|
while (en.hasMoreElements()) {
|
| 353 |
|
|
Object qobject = en.nextElement();
|
| 354 |
|
|
self.append(qobject);
|
| 355 |
|
|
}
|
| 356 |
|
|
self.append(" )\n");
|
| 357 |
|
|
return self.toString();
|
| 358 |
|
|
}
|
| 359 |
158
|
jones
|
}
|
| 360 |
|
|
|
| 361 |
|
|
/** a utility class that represents a single term in a query */
|
| 362 |
|
|
private class QueryTerm {
|
| 363 |
|
|
private boolean casesensitive = false;
|
| 364 |
|
|
private String searchmode = null;
|
| 365 |
|
|
private String value = null;
|
| 366 |
|
|
private String pathexpr = null;
|
| 367 |
|
|
|
| 368 |
172
|
jones
|
/**
|
| 369 |
|
|
* Construct a new instance of a query term for a free text search
|
| 370 |
|
|
* (using the value only)
|
| 371 |
|
|
*
|
| 372 |
|
|
* @param casesensitive flag indicating whether case is used to match
|
| 373 |
|
|
* @param searchmode determines what kind of substring match is performed
|
| 374 |
|
|
* (one of starts-with|ends-with|contains|matches-exactly)
|
| 375 |
|
|
* @param value the text value to match
|
| 376 |
|
|
*/
|
| 377 |
158
|
jones
|
public QueryTerm(boolean casesensitive, String searchmode,
|
| 378 |
|
|
String value) {
|
| 379 |
|
|
this.casesensitive = casesensitive;
|
| 380 |
|
|
this.searchmode = searchmode;
|
| 381 |
|
|
this.value = value;
|
| 382 |
|
|
}
|
| 383 |
|
|
|
| 384 |
172
|
jones
|
/**
|
| 385 |
|
|
* Construct a new instance of a query term for a structured search
|
| 386 |
|
|
* (matching the value only for those nodes in the pathexpr)
|
| 387 |
|
|
*
|
| 388 |
|
|
* @param casesensitive flag indicating whether case is used to match
|
| 389 |
|
|
* @param searchmode determines what kind of substring match is performed
|
| 390 |
|
|
* (one of starts-with|ends-with|contains|matches-exactly)
|
| 391 |
|
|
* @param value the text value to match
|
| 392 |
|
|
* @param pathexpr the hierarchical path to the nodes to be searched
|
| 393 |
|
|
*/
|
| 394 |
158
|
jones
|
public QueryTerm(boolean casesensitive, String searchmode,
|
| 395 |
|
|
String value, String pathexpr) {
|
| 396 |
|
|
this(casesensitive, searchmode, value);
|
| 397 |
|
|
this.pathexpr = pathexpr;
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
172
|
jones
|
/** determine if the QueryTerm is case sensitive */
|
| 401 |
158
|
jones
|
public boolean isCaseSensitive() {
|
| 402 |
|
|
return casesensitive;
|
| 403 |
|
|
}
|
| 404 |
|
|
|
| 405 |
172
|
jones
|
/** get the searchmode parameter */
|
| 406 |
158
|
jones
|
public String getSearchMode() {
|
| 407 |
|
|
return searchmode;
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
172
|
jones
|
/** get the Value parameter */
|
| 411 |
158
|
jones
|
public String getValue() {
|
| 412 |
|
|
return value;
|
| 413 |
|
|
}
|
| 414 |
|
|
|
| 415 |
172
|
jones
|
/** get the path expression parameter */
|
| 416 |
158
|
jones
|
public String getPathExpression() {
|
| 417 |
|
|
return pathexpr;
|
| 418 |
|
|
}
|
| 419 |
159
|
jones
|
|
| 420 |
172
|
jones
|
/**
|
| 421 |
|
|
* create a SQL serialization of the query that this instance represents
|
| 422 |
|
|
*/
|
| 423 |
|
|
public String printSQL() {
|
| 424 |
170
|
jones
|
StringBuffer self = new StringBuffer();
|
| 425 |
|
|
|
| 426 |
|
|
// Uppercase the search string if case match is not important
|
| 427 |
|
|
String casevalue = null;
|
| 428 |
|
|
String nodedataterm = null;
|
| 429 |
|
|
|
| 430 |
|
|
if (casesensitive) {
|
| 431 |
|
|
nodedataterm = "nodedata";
|
| 432 |
|
|
casevalue = value;
|
| 433 |
|
|
} else {
|
| 434 |
|
|
nodedataterm = "UPPER(nodedata)";
|
| 435 |
|
|
casevalue = value.toUpperCase();
|
| 436 |
|
|
}
|
| 437 |
|
|
|
| 438 |
|
|
// Add appropriate wildcards to search string
|
| 439 |
|
|
String searchvalue = null;
|
| 440 |
|
|
if (searchmode.equals("starts-with")) {
|
| 441 |
|
|
searchvalue = casevalue + "%";
|
| 442 |
|
|
} else if (searchmode.equals("ends-with")) {
|
| 443 |
|
|
searchvalue = "%" + casevalue;
|
| 444 |
|
|
} else if (searchmode.equals("contains")) {
|
| 445 |
|
|
searchvalue = "%" + casevalue + "%";
|
| 446 |
|
|
} else {
|
| 447 |
|
|
searchvalue = casevalue;
|
| 448 |
|
|
}
|
| 449 |
|
|
|
| 450 |
178
|
jones
|
self.append("SELECT DISTINCT docid FROM xml_nodes WHERE \n");
|
| 451 |
170
|
jones
|
|
| 452 |
|
|
if (pathexpr != null) {
|
| 453 |
|
|
self.append(nodedataterm + " LIKE " + "'" + searchvalue + "' ");
|
| 454 |
|
|
self.append("AND parentnodeid IN ");
|
| 455 |
|
|
self.append("(SELECT nodeid FROM xml_index WHERE path LIKE " +
|
| 456 |
|
|
"'" + pathexpr + "') " );
|
| 457 |
|
|
} else {
|
| 458 |
|
|
self.append(nodedataterm + " LIKE " + "'" + searchvalue + "' ");
|
| 459 |
|
|
}
|
| 460 |
|
|
|
| 461 |
|
|
return self.toString();
|
| 462 |
|
|
}
|
| 463 |
|
|
|
| 464 |
172
|
jones
|
/**
|
| 465 |
|
|
* create a String description of the query that this instance represents.
|
| 466 |
|
|
* This should become a way to get the XML serialization of the query.
|
| 467 |
|
|
*/
|
| 468 |
159
|
jones
|
public String toString() {
|
| 469 |
|
|
StringBuffer self = new StringBuffer();
|
| 470 |
|
|
|
| 471 |
|
|
self.append(" Query Term iscasesensitive=" + casesensitive + "\n");
|
| 472 |
|
|
self.append(" searchmode=" + searchmode + "\n");
|
| 473 |
|
|
self.append(" value=" + value + "\n");
|
| 474 |
|
|
if (pathexpr != null) {
|
| 475 |
|
|
self.append(" pathexpr=" + pathexpr + "\n");
|
| 476 |
|
|
}
|
| 477 |
|
|
|
| 478 |
|
|
return self.toString();
|
| 479 |
|
|
}
|
| 480 |
158
|
jones
|
}
|
| 481 |
155
|
jones
|
}
|
| 482 |
203
|
jones
|
|
| 483 |
|
|
/**
|
| 484 |
|
|
* '$Log$
|
| 485 |
|
|
* 'Revision 1.9.2.3 2000/06/25 23:38:17 jones
|
| 486 |
|
|
* 'Added RCSfile keyword
|
| 487 |
|
|
* '
|
| 488 |
|
|
* 'Revision 1.9.2.2 2000/06/25 23:34:18 jones
|
| 489 |
|
|
* 'Changed documentation formatting, added log entries at bottom of source files
|
| 490 |
|
|
* ''
|
| 491 |
|
|
*/
|