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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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172
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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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145 |
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* element is detected. Used in this context to parse and store
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146 |
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* the query information in class variables.
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*/
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185
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public void startElement (String uri, String localName,
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149 |
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String qName, Attributes atts)
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150 |
155
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throws SAXException {
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185
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BasicNode currentNode = new BasicNode(localName);
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159
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// add attributes to BasicNode here
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if (atts != null) {
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154 |
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int len = atts.getLength();
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155 |
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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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157 |
159
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}
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158 |
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}
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159 |
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160 |
158
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elementStack.push(currentNode);
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161 |
159
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if (currentNode.getTagName().equals("querygroup")) {
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158
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QueryGroup currentGroup = new QueryGroup(
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178
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currentNode.getAttribute("operator"));
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158
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if (query == null) {
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165 |
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query = currentGroup;
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159
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} else {
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167 |
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QueryGroup parentGroup = (QueryGroup)queryStack.peek();
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168 |
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parentGroup.addChild(currentGroup);
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158
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}
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159
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queryStack.push(currentGroup);
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158
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}
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155
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}
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173 |
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174 |
172
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jones
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/**
|
175 |
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* callback method used by the SAX Parser when the end tag of an
|
176 |
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* element is detected. Used in this context to parse and store
|
177 |
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* the query information in class variables.
|
178 |
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*/
|
179 |
185
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jones
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public void endElement (String uri, String localName,
|
180 |
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String qName) throws SAXException {
|
181 |
158
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BasicNode leaving = (BasicNode)elementStack.pop();
|
182 |
159
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jones
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if (leaving.getTagName().equals("queryterm")) {
|
183 |
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boolean isCaseSensitive = (new Boolean(
|
184 |
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leaving.getAttribute("casesensitive"))).booleanValue();
|
185 |
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QueryTerm currentTerm = null;
|
186 |
|
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if (currentPathexpr == null) {
|
187 |
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currentTerm = new QueryTerm(isCaseSensitive,
|
188 |
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leaving.getAttribute("searchmode"),currentValue);
|
189 |
|
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} else {
|
190 |
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currentTerm = new QueryTerm(isCaseSensitive,
|
191 |
|
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leaving.getAttribute("searchmode"),currentValue,
|
192 |
|
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currentPathexpr);
|
193 |
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}
|
194 |
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QueryGroup currentGroup = (QueryGroup)queryStack.peek();
|
195 |
|
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currentGroup.addChild(currentTerm);
|
196 |
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currentValue = null;
|
197 |
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currentPathexpr = null;
|
198 |
|
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} else if (leaving.getTagName().equals("querygroup")) {
|
199 |
|
|
QueryGroup leavingGroup = (QueryGroup)queryStack.pop();
|
200 |
158
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jones
|
}
|
201 |
155
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}
|
202 |
158
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jones
|
|
203 |
172
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jones
|
/**
|
204 |
|
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* callback method used by the SAX Parser when the text sequences of an
|
205 |
|
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* xml stream are detected. Used in this context to parse and store
|
206 |
|
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* the query information in class variables.
|
207 |
|
|
*/
|
208 |
158
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jones
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public void characters(char ch[], int start, int length) {
|
209 |
|
|
|
210 |
|
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String inputString = new String(ch, start, length);
|
211 |
|
|
BasicNode currentNode = (BasicNode)elementStack.peek();
|
212 |
|
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String currentTag = currentNode.getTagName();
|
213 |
|
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if (currentTag.equals("meta_file_id")) {
|
214 |
|
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meta_file_id = inputString;
|
215 |
|
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} else if (currentTag.equals("querytitle")) {
|
216 |
|
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querytitle = inputString;
|
217 |
159
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} else if (currentTag.equals("value")) {
|
218 |
|
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currentValue = inputString;
|
219 |
|
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} else if (currentTag.equals("pathexpr")) {
|
220 |
|
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currentPathexpr = inputString;
|
221 |
172
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} else if (currentTag.equals("returndoctype")) {
|
222 |
|
|
doctypeList.add(inputString);
|
223 |
158
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}
|
224 |
|
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}
|
225 |
|
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|
226 |
172
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|
227 |
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/**
|
228 |
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* create a SQL serialization of the query that this instance represents
|
229 |
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*/
|
230 |
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public String printSQL() {
|
231 |
170
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jones
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StringBuffer self = new StringBuffer();
|
232 |
|
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|
233 |
172
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// This determines the returned results
|
234 |
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self.append("SELECT docid,docname,doctype,doctitle ");
|
235 |
|
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self.append("FROM xml_documents WHERE docid IN (");
|
236 |
170
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jones
|
|
237 |
178
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// This determines the documents that meet the query conditions
|
238 |
172
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self.append(query.printSQL());
|
239 |
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|
240 |
|
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self.append(") ");
|
241 |
|
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|
242 |
|
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// Add SQL to filter for doctypes requested in the query
|
243 |
|
|
if (!doctypeList.isEmpty()) {
|
244 |
|
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boolean firstdoctype = true;
|
245 |
|
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self.append(" AND (");
|
246 |
|
|
Enumeration en = doctypeList.elements();
|
247 |
|
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while (en.hasMoreElements()) {
|
248 |
|
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String currentDoctype = (String)en.nextElement();
|
249 |
|
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if (firstdoctype) {
|
250 |
|
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firstdoctype = false;
|
251 |
|
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self.append(" doctype = '" + currentDoctype + "'");
|
252 |
|
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} else {
|
253 |
|
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self.append(" OR doctype = '" + currentDoctype + "'");
|
254 |
|
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}
|
255 |
|
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}
|
256 |
|
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self.append(") ");
|
257 |
|
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}
|
258 |
|
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|
259 |
170
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return self.toString();
|
260 |
|
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}
|
261 |
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262 |
172
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jones
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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.
|
265 |
|
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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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}
|
270 |
|
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|
271 |
158
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jones
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/** a utility class that represents a group of terms in a query */
|
272 |
|
|
private class QueryGroup {
|
273 |
178
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jones
|
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
|
275 |
158
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jones
|
|
276 |
172
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jones
|
/**
|
277 |
|
|
* construct a new QueryGroup
|
278 |
|
|
*
|
279 |
178
|
jones
|
* @param operator the boolean conector used to connect query terms
|
280 |
172
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jones
|
* in this query group
|
281 |
|
|
*/
|
282 |
178
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jones
|
public QueryGroup(String operator) {
|
283 |
|
|
this.operator = operator;
|
284 |
158
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jones
|
children = new Vector();
|
285 |
|
|
}
|
286 |
|
|
|
287 |
172
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jones
|
/**
|
288 |
|
|
* Add a child QueryGroup to this QueryGroup
|
289 |
|
|
*
|
290 |
|
|
* @param qgroup the query group to be added to the list of terms
|
291 |
|
|
*/
|
292 |
158
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jones
|
public void addChild(QueryGroup qgroup) {
|
293 |
|
|
children.add((Object)qgroup);
|
294 |
|
|
}
|
295 |
|
|
|
296 |
172
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jones
|
/**
|
297 |
|
|
* Add a child QueryTerm to this QueryGroup
|
298 |
|
|
*
|
299 |
|
|
* @param qterm the query term to be added to the list of terms
|
300 |
|
|
*/
|
301 |
158
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jones
|
public void addChild(QueryTerm qterm) {
|
302 |
|
|
children.add((Object)qterm);
|
303 |
|
|
}
|
304 |
|
|
|
305 |
172
|
jones
|
/**
|
306 |
|
|
* Retrieve an Enumeration of query terms for this QueryGroup
|
307 |
|
|
*/
|
308 |
158
|
jones
|
public Enumeration getChildren() {
|
309 |
|
|
return children.elements();
|
310 |
|
|
}
|
311 |
159
|
jones
|
|
312 |
172
|
jones
|
/**
|
313 |
|
|
* create a SQL serialization of the query that this instance represents
|
314 |
|
|
*/
|
315 |
|
|
public String printSQL() {
|
316 |
170
|
jones
|
StringBuffer self = new StringBuffer();
|
317 |
|
|
boolean first = true;
|
318 |
|
|
|
319 |
|
|
self.append("(");
|
320 |
|
|
|
321 |
|
|
Enumeration en= getChildren();
|
322 |
|
|
while (en.hasMoreElements()) {
|
323 |
|
|
Object qobject = en.nextElement();
|
324 |
|
|
if (first) {
|
325 |
|
|
first = false;
|
326 |
|
|
} else {
|
327 |
178
|
jones
|
self.append(" " + operator + " ");
|
328 |
170
|
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 |
|
|
*/
|